作者： Sun, Tian;Liu, Piao;Yang, Daihui;Wang, Qiyou;Duan, Junfei（段军飞）;...

期刊： ChemNanoMat,2019年5(11):1390-1397 ISSN：2199-692X

通讯作者： Gao, Yang;Zhang, Shiguo

作者机构： [Wang, Qiyou; Sun, Tian; Ma, Chao; Gao, Yang; Yang, Daihui; Zhang, Shiguo] Hunan Univ, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Liu, Piao] Hunan LEED Elect Ink Co Ltd, Zhuzhou 412007, Peoples R China.;[Duan, Junfei] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Gao, Y; Zhang, SG] H;Hunan Univ, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： oxygen evolution reaction;carbon template;mesoporous Co3O4;cobalt phosphide;heterogeneous catalyst

摘要： Highly active and stable catalysts towards electrochemical oxygen evolution reaction are crucial for the efficient water splitting and sustainable hydrogen generation. Here we report a novel mesoporous Co3O4 with the surface decoration of mixed CoOxPy species towards efficient OER catalysis. The material is synthesized from a simple carbon template derived from p-phenylenediamine bisulfate followed by low temperature phosphorization. Unlike traditional methods, silica intermediates are not involved during synthesis, improving the overall safety and efficiency. The as-prepared mesoporous Co3O4/CoOxPy catalyst shows excellent catalytic activity and stability towards oxygen evolution reaction in 1 M KOH. The overpotential is 295 mV at 10 mA cm−2, superior to that of commercial IrO2/C catalyst. A small Tafel slope of 70 mV dec−1 and high stability are also observed. The excellent electrochemical performance is attributed to the mesoporous structure, strong electronic interaction, and synergistic effect of the mesoporous Co3O4 and CoOxPy phases. Other heterogeneous catalysts with similar structures and compositions may also be fabricated following the same design principle. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

语种： 英文

作者： Chen, Jie;Yang, Huiping;Li, Nanhao;Liu, Chaoyang;Tong, Hui;...

期刊： FRONTIERS IN CHEMISTRY,2019年7:478270 ISSN：2296-2646

通讯作者： Li, Lingjun

作者机构： [Duan, Junfei; Li, Nanhao; Chen, Jiaxin; Yang, Huiping; Xia, Lingfeng; Chen, Zhaoyong; Liu, Chaoyang; Liu, Zengsheng; Chen, Jie; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Tong, Hui] Cent South Univ, Sch Met & Environm, Changsha, Hunan, Peoples R China.;[Li, Lingjun] Changsha Univ Sci & Technol, Hunan Prov Key Lab Modeling & Monitoring Near Ear, Changsha, Hunan, Peoples R China.

通讯机构： [Li, Lingjun] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha, Hunan, Peoples R China.;Changsha Univ Sci & Technol, Hunan Prov Key Lab Modeling & Monitoring Near Ear, Changsha, Hunan, Peoples R China.

关键词： cathode materials;LiNi0.8Co0.1Mn0.1O2;lithium ion batteries;phase transitions;Ti-doped

摘要： Although LiNi0.8Co0.1Mn0.1O2 is attracting increasing attention on account of its high specific capacity, the moderate cycle lifetime still hinders its large-scale commercialization applications. Herein, the Ti-doped LiNi0.8Co0.1Mn0.1O2 compounds are successfully synthesized. The Li(Ni0.8Co0.1Mn0.1)0.99Ti0.01O2 sample exhibits the best electrochemical performance. Under the voltage range of 2.7–4.3 V, it maintains a reversible capacity of 151.01 mAh·g−1 with the capacity retention of 83.98% after 200 cycles at 1 C. Electrochemical impedance spectroscopy (EIS) and differential capacity profiles during prolonged cycling demonstrate that the Ti doping could enhance both the abilities of electronic transition and Li ion diffusion. More importantly, Ti doping can also improve the reversibility of the H2-H3 phase transitions during charge-discharge cycles, thus improving the electrochemical performance of Ni-rich cathodes. © Copyright © 2019 Chen, Yang, Li, Liu, Tong, Chen, Liu, Xia, Chen, Duan and Li.

语种： 英文

作者： Chen, Zhaoyong*;Zhang, Zeng;Zhao, Qunfang;Duan, Junfei（段军飞）;Zhu, Huali

期刊： JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY,2019年19(1):119-124 ISSN：1533-4880

通讯作者： Chen, Zhaoyong

作者机构： [Duan, Junfei; Zhang, Zeng; Zhu, Huali; Chen, Zhaoyong; Zhao, Qunfang] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Chen, Zhaoyong] Chinese Acad Sci, Sate Key Lab Space Weather, Beijing 100190, Peoples R China.

通讯机构： [Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;Chinese Acad Sci, Sate Key Lab Space Weather, Beijing 100190, Peoples R China.

关键词： Lithium Ion Battery;LiFePO4;First-Principles;K+ Doping

摘要： The K-doped Li1-xKxFePO4 (x = 0, 0.005, 0.01, and 0.02) samples were synthesized successfully via a solid-state method, and the electronic structures of the samples were calculated by the first-principles based on density functional theory. Theoretical calculations show that the bandwidth of Li1-xKxFePO4 decreases with the increase in K+ doping, which is consistent with the experimental results. It was demonstrated that Li0.995K0.005FePO4 delivers higher capacity retention with 92.7% after 100 cycles compared with LiFePO4 (86.3%) at 1 C and shows better high-rate performance with capacities of 151.9, 151.8, 149.2, 128.3, and 84.6 mAh.g(-1) at current densities of 0.1 C, 0.2 C, 0.5 C, 1 C, and 3 C; the corresponding values for LiFePO4 were 153.2, 136.5, 125.9, 111.5, and 66.0 mAh.g(-1). Owing to the expanded Li ion diffusion pathway, EIS analysis showed that the lithium ion diffusion coefficient of LiFePO4 doped with K ion was significantly improved compared to LiFePO4; the values were 1.934x10(-13) and 1.658x10(-12) cm(2).s(-1), respectively. Additionally, Li0.995K0.005FePO4 showed a lower charge transfer resistance (300.2 Omega compared to 407.1 Omega of LiFePO4).

语种： 英文

作者： Ni, Wenpeng;Gao, Yang;Zhang, Yi;Younus, Hussein A.;Guo, Xiaoguang;...

期刊： ACS Applied Materials & Interfaces,2019年11(49):45825-45831 ISSN：1944-8244

通讯作者： Zhang, Yan;Zhang, Shiguo

作者机构： [Ma, Chao; Gao, Yang; Zhang, Yi; Zhang, Y; Zhang, Shiguo; Zhang, Yan; Ni, Wenpeng; Younus, Hussein A.] Hunan Univ, Coll Mat Sci & Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410004, Hunan, Peoples R China.;[Guo, Xiaoguang] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China.;[Duan, Junfei] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Zhang, Jiaheng] Harbin Inst Technol Shenzhen, Sch Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China.

通讯机构： [Zhang, Y; Zhang, SG] H;Hunan Univ, Coll Mat Sci & Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410004, Hunan, Peoples R China.

关键词： O-doping;carbon materials;carbonyl group;oxygen reduction reaction;single-atom catalysts

摘要： Carbon-based electrocatalysts with single metal sites hold great potential for mechanism exploration via mimicking molecular catalysts, due to their distinct catalytic sites. In addition to metal atoms, the neighboring nonmetal heteroatoms such as N, S, and O atoms, which are widely detected in carbon-based single-atom catalysts, may also contribute to enhancing the electrochemical activity of single-metal centers. In this work, the boosting effect of O-doping toward the electrochemical oxygen reduction reaction (ORR) was evaluated by both experimental studies and DFT calculations. O-doped carbon-supported single-Fe-site catalysts possessing deep mesopores and desirable hydrophilic surface were achieved by confined carbonization in an inert or reductive atmosphere (SAFe-NDC and SAFe-NDC-H). As compared to the state-of-the-art Pt/C, these catalysts showed superior catalytic activity toward the ORR in terms of half-wave potential, Tafel slope, and long-term stability. In particular, SAFe-NDC-H outperformed its SAFe-NDC counterpart. Considering that these two catalysts possess a comparable porous structure, surface properties, and local electronic structure of a single Fe site, the dopant nonmetal O atoms, specifically, carbonyl group (C= O), are revealed to affect the ORR activity of the single Fe site exclusively. The introduced C= O facilitates the formation of *OOH as well as the reduction of *OH, thereby reducing the catalysts' overpotential. © 2019 American Chemical Society.

语种： 英文

作者： Nie, Yan;Zhang, Hang;Zhang, Jinfeng;Wang, Lei;Zhong, Siyu;...

期刊： ChemElectroChem,2019年6(19):5060-5069 ISSN：2196-0216

通讯作者： Zhang, Guanhua

作者机构： [Zhang, Guanhua; Duan, Huigao; Zhang, Jinfeng; Victor, Kipkoech Kirui; Nie, Yan; Wang, Lei; Zhong, Siyu] Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.;[Zhang, Hang] Shaanxi Normal Univ, Sch Chem & Chem Engn, Minist Educ, Key Lab Appl Surface & Colloid Chem, Xian 710119, Shaanxi, Peoples R China.;[Duan, Junfei; Wu, Yinglong] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Shi, Huimin] Guangzhou Univ, Sch Mech & Elect Engn, Ctr Res Leading Technol Special Equipment, Guangzhou 510006, Guangdong, Peoples R China.

通讯机构： [Zhang, Guanhua] H;Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

关键词： lithium-ion batteries;anodes;low lithiation;delithiation potential;phosphorization;Fe3O4

摘要： <jats:title>Abstract</jats:title><jats:p>In terms of Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub>‐based anodes, enormous academic progress has been achieved over the past two decades; however, even with excellent half‐cell performance, the relatively high lithiation potential and unsatisfactory initial coulombic efficiency (ICE) represent two major barriers to their commercial application, at present. We propose partially phosphorized Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> (P−Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub>) with interior void spaces induced by phosphorization to enhance the Li<jats:sup>+</jats:sup> storage property of Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub>‐based anodes. P−Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> anodes offer a much higher capacity at low potential compared with bare Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> electrodes. Additionally, the well‐designed nanostructure with preferable specific surface area prevents the initial irreversible lithium loss, which contributes to a brilliant ICE (80.8 % at 100 mA g<jats:sup>−1</jats:sup>). Moreover, in‐situ X‐ray diffraction proves that the formation of the Li<jats:sub><jats:italic>x</jats:italic></jats:sub>Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> phase results from an initial intercalation process. In particular, the output voltage and energy density of P−Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> full‐cells are much greater than those of Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> full‐cells. In this work, the P−Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> full‐cell exhibits a capacity of 680 mAh g<jats:sup>−1</jats:sup> at 200 mA g<jats:sup>−1</jats:sup> as well as an excellent rate capability of 267 mAh g<jats:sup>−1</jats:sup> with a current density up to 1000 mA g<jats:sup>−1</jats:sup>. This study presents a new strategy to enhance Li<jats:sup>+</jats:sup> storage of Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> enabling low lithiation/delithiation potential and high ICE, which may offer exciting opportunities toward designing high‐performance full‐cells with commercial cathodes.</jats:p>

语种： 英文

作者： Wu, Yinglong;Zhu, Chao;Shu, Lin;Duan, Junfei*（段军飞）;Wei, Donghai;...

期刊： Applied Surface Science,2019年489:528-537 ISSN：0169-4332

通讯作者： Duan, Junfei（段军飞）;Zhu, Zhiying

作者机构： [Duan, Junfei; Shu, Lin; Zhu, Chao; Chen, Zhaoyong; Wu, Yinglong; Wei, Donghai; Xu, Jiaxiong; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410111, Hunan, Peoples R China.;[Zhu, Zhiying] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410111, Hunan, Peoples R China.;[Peng, Zhuoyin] Changsha Univ Sci & Technol, Sch Energy & Power Engn, Educ Dept Hunan Prov, Key Lab Efficient & Clean Energy Utilizat, Changsha 410111, Hunan, Peoples R China.

通讯机构： [Duan, Junfei; Zhu, Zhiying] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410111, Hunan, Peoples R China.;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410111, Hunan, Peoples R China.

关键词： Bifunctional N/S co-doped carbon/carbon;Co9S8/NSC@C;Half/full cell;In-situ polymerization;Lithium ion batteries

摘要： The lithium storage performance of Co9S8 suffers from the poor cycling performance due to the inferior electron conductivity, huge volume expansion and structure deterioration during cycling. Herein, we develop a new approach to prepare the Co9S8 embedded in bifunctional N/S co-doped carbon/carbon (Co9S8/NSC@C) via the pyrolysis of S- and Co(II)-containing polypyrrole precursor accompanied by Ethanol Steam Reforming. The process simultaneously restricted the Co9S8 grains growth and conducted carbon deposition on the outer surface of Co9S8 nanoparticles. Such unique structure of the Co9S8/NSC@C electrode material exhibits superior lithium storage performance, delivering a high reversible specific capacity of 580 mAh g−1 after 200 cycles at 0.1 A g−1 for half-cell and a good rate capability with a reversible capacity of 159 mAh g−1 at various current densities after 60 cycles for full-cell. The function-oriented design of Co9S8/NSC@C might open new avenues for the preparation of similar electrode materials. © 2019 Elsevier B.V.

语种： 英文

作者： Yang, Huiping;Wu, Hong-Hui;Ge, Mingyuan;Li, Lingjun*;Yuan, Yifei;...

期刊： Advanced Functional Materials,2019年29(13):1808825- ISSN：1616-301X

通讯作者： Li, Lingjun;Zhang, Qiaobao;Lu, Jun

作者机构： [Duan, Junfei; Yang, Huiping; Xia, Lingfeng; Chen, Jie; Li, Lingjun; Yao, Qi; Chen, Zhaoyong] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Zhang, Qiaobao] Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Fujian, Peoples R China.;[Lu, Jun; Yuan, Yifei] Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA.;[Wu, Hong-Hui; Zeng, Xiao Cheng] Univ Nebraska, Dept Chem, Lincoln, NE 68588 USA.;[Lee, Wah-Keat; Kisslinger, Kim; Ge, Mingyuan] Brookhaven Natl Lab, NSLS 2, Upton, NY 11973 USA.

通讯机构： [Li, Lingjun] C;[Zhang, Qiaobao] X;[Lu, Jun] A;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Fujian, Peoples R China.

关键词： DFT calculation;dual-modification strategy;lithium-ion batteries;Ni-rich materials;synchronous synthesis

摘要： <jats:title>Abstract</jats:title><jats:p>A critical challenge in the commercialization of layer‐structured Ni‐rich materials is the fast capacity drop and voltage fading due to the interfacial instability and bulk structural degradation of the cathodes during battery operation. Herein, with the guidance of theoretical calculations of migration energy difference between La and Ti from the surface to the inside of LiNi<jats:sub>0.8</jats:sub>Co<jats:sub>0.1</jats:sub>Mn<jats:sub>0.1</jats:sub>O<jats:sub>2</jats:sub>, for the first time, Ti‐doped and La<jats:sub>4</jats:sub>NiLiO<jats:sub>8</jats:sub>‐coated LiNi<jats:sub>0.8</jats:sub>Co<jats:sub>0.1</jats:sub>Mn<jats:sub>0.1</jats:sub>O<jats:sub>2</jats:sub> cathodes are rationally designed and prepared, via a simple and convenient dual‐modification strategy of synchronous synthesis and in situ modification. Impressively, the dual modified materials show remarkably improved electrochemical performance and largely suppressed voltage fading, even under exertive operational conditions at elevated temperature and under extended cutoff voltage. Further studies reveal that the nanoscale structural degradation on material surfaces and the appearance of intergranular cracks associated with the inconsistent evolution of structural degradation at the particle level can be effectively suppressed by the synergetic effect of the conductive La<jats:sub>4</jats:sub>NiLiO<jats:sub>8</jats:sub> coating layer and the strong TiO bond. The present work demonstrates that our strategy can simultaneously address the two issues with respect to interfacial instability and bulk structural degradation, and it represents a significant progress in the development of advanced cathode materials for high‐performance lithium‐ion batteries.</jats:p>

语种： 英文

作者： Zhu, Chao;Wei, Donghai;Wu, Yinglong;Zhang, Zeng;Zhang, Guanhua;...

期刊： Journal of Alloys and Compounds,2019年778:731-740 ISSN：0925-8388

通讯作者： Duan, Junfei（段军飞）;Chen, Zhaoyong

作者机构： [Duan, Junfei; Duan, JF; Chen, Zhaoyong; Zhu, Chao; Zhang, Zeng; Zhu, Huali; Zhu, Zhiying; Wu, Yinglong; Wei, Donghai; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Zhang, Guanhua] Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Duan, JF; Chen, ZY] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.

关键词： Anodes;Carbon;Carbon carbon composites;Doping (additives);Ethanol;Ions;Nanocrystalline materials;Nanocrystals;Polypyrroles;Steam reforming;Carbonaceous species;Electrochemical performance;Ethanol steam reforming;Lithiation/delithiation;N-doped;Nanocrystallines;Rechargeable lithium ion battery;Sacrificial templates;Lithium-ion batteries

摘要： Tin-based materials have been considered as promising anode materials for their high theoretical capacities in rechargeable lithium ion batteries. However, the large volume variation during repeated lithiation/delithiation processes, leads to aggregation and pulverization of active materials, which limits their practical application. Herein, a facile and effective strategy was designed to construct interconnected porous SnOx/N-doped carbon framework, using Sn(IV)-containing polypyrrole as sacrificial template/precursor followed by depositing carbonaceous species via ethanol steam reforming process. Benefiting from the synergistic effects between ultrafine SnO2 and Sn nanocrystals, porous N-doped carbon and carbon matrices derived from polypyrrole and ethanol, respectively, the composite exhibits large reversible capacity of 728.6 mAh g−1 after 140 cycles at 100 mA g−1, and a long-term cycling performance of 435 mAh g−1 after 500 cycles even at 1000 mA g−1. The remarkable high electrochemical performance, together with the scalable production and low-cost starting materials, will advance the promising application of Sn-based composite to next generation rechargeable batteries. © 2018 Elsevier B.V.

语种： 英文

作者： Chen, Zhaoyong;Gong, Xiaolong;Zhu, Huali;Cao, Kaifeng;Liu, Qiming;...

期刊： FRONTIERS IN CHEMISTRY,2019年6(JAN):643 ISSN：2296-2646

通讯作者： Chen, ZY

作者机构： [Duan, Junfei; Chen, Zhaoyong; Gong, Xiaolong; Cao, Kaifeng; Liu, Qiming; Liu, Jun; Li, Lingjun] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Zhu, Huali] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha, Hunan, Peoples R China.;[Zhu, Huali] Univ New Hampshire, Dept Chem, Durham, NH 03824 USA.

通讯机构： [Chen, ZY ] ;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.

关键词： LiNi0.5Co0.2Mn0.3O2;cation mixing;co-doping;lithium ion batteries;phase transition

摘要： The high energy density lithium ion batteries are being pursued because of their extensive application in electric vehicles with a large mileage and storage energy station with a long life. So, increasing the charge voltage becomes a strategy to improve the energy density. But it brings some harmful to the structural stability. In order to find the equilibrium between capacity and structure stability, the K and Cl co-doped LiNi0.5Co0.2Mn0.3O2 (NCM) cathode materials are designed based on defect theory, and prepared by solid state reaction. The structure is investigated by means of X-ray diffraction (XRD), rietveld refinements, scanning electron microscope (SEM), XPS, EDS mapping and transmission electron microscope (TEM). Electrochemical properties are measured through electrochemical impedance spectroscopy (EIS), cyclic voltammogram curves (CV), charge/discharge tests. The results of XRD, EDS mapping, and XPS show that K and Cl are successfully incorporated into the lattice of NCM cathode materials. Rietveld refinements along with TEM analysis manifest K and Cl co-doping can effectively reduce cation mixing and make the layered structure more complete. After 100 cycles at 1 C, the K and Cl co-doped NCM retains a more integrated layered structure compared to the pristine NCM. It indicates the co-doping can effectively strengthen the layer structure and suppress the phase transition to some degree during repeated charge and discharge process. Through CV curves, it can be found that K and Cl co-doping can weaken the electrode polarization and improve the electrochemical performance. Electrochemical tests show that the discharge capacity of Li0.99K0.01(Ni0.5Co0.3Mn0.2)O1.99Cl0.01 (KCl-NCM) are far higher than NCM at 5 C, and capacity retention reaches 78.1% after 100 cycles at 1 C. EIS measurement indicates that doping K and Cl contributes to the better lithium ion diffusion and the lower charge transfer resistance.

语种： 英文

作者： Chen, Zhaoyong*;Cao, Kaifeng;Zhu, Huali;Gong, Xiaolong;Liu, Qiming;...

期刊： FRONTIERS IN CHEMISTRY,2019年6(JAN):648 ISSN：2296-2646

通讯作者： Chen, Zhaoyong

作者机构： [Duan, Junfei; Liu, Qiming; Cao, Kaifeng; Gong, Xiaolong; Chen, Zhaoyong; Li, Lingjun] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Zhu, Huali] Changsha Univ Sci & Technol, Coll Phys & Elect Sci, Changsha, Hunan, Peoples R China.;[Zhu, Huali] Univ New Hampshire, Dept Chem, Durham, NH 03824 USA.

通讯机构： [Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.

关键词： cathode materials;conductive polymer;lithium-ion batteries;nickel-rich layered oxide;polypyrrole coating

摘要： Nickel-rich ternary layered oxide (LiNi0.80Co0.15Al0.05O2, LNCA) cathodes are favored in many fields such as electric vehicles due to its high specific capacity, low cost, and stable structure. However, LNCA cathode material still has the disadvantages of low initial coulombic efficiency, rate capability and poor cycle performance, which greatly restricts its commercial application. To overcome this barrier, a polypyrrole (PPy) layer with high electrical conductivity is designed to coat on the surface of LNCA cathode material. PPy coating layer on the surface of LNCA successfully is realized by means of liquid-phase chemical oxidation polymerization method, and which has been verified by the scanning electron microscopy (SEM), transmission electron microscope (TEM) and fourier transform infrared spectroscopy (FTIR). PPy-coated LNCA (PL-2) exhibits satisfactory electrochemical performances including high reversible capacity and excellent rate capability. Furthermore, the capability is superior to pristine LNCA. So, it provides a new structure of conductive polymer modified cathode materials with good property through a mild modification method.

语种： 英文

作者： Lin, Chenxiao;Wang, Jixia;Shen, Guohong;Duan, Junfei（段军飞）;Xie, Dong;...

期刊： Journal of Membrane Science,2019年590:117303 ISSN：0376-7388

通讯作者： Cheng, Faliang;Zhang, Yan;Zhang, Shiguo

作者机构： [Cheng, Faliang; Xie, Dong; Lin, Chenxiao] Dongguan Univ Technol, Sch Environm & Civil Engn, Guangdong Engn & Technol Res Ctr Adv Nanomat, Dongguan 523808, Peoples R China.;[Wang, Jixia; Lin, Chenxiao; Shen, Guohong; Zhang, Y; Zhang, Shiguo; Zhang, Yan] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Lin, Chenxiao] Xi An Jiao Tong Univ, Sch Sci, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Shaanxi, Peoples R China.;[Duan, Junfei] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Cheng, Faliang] D;[Zhang, Y; Zhang, SG] H;Dongguan Univ Technol, Sch Environm & Civil Engn, Guangdong Engn & Technol Res Ctr Adv Nanomat, Dongguan 523808, Peoples R China.;Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： Anion exchange membrane;Crosslinking;Micro-phase separation;Piperidinium;Polybenzimidazole

摘要： In order to develop anion exchange membranes (AEMs) with high ionic conductivity, low swelling ratio (SR) and long-term alkaline stability, a series of crosslinked polybenzimidazole-based AEMs (FPBI-QPVC(x)) were prepared. We herein demonstrated that the integration of a partially fluorinated polybenzimidazole and quaternized poly (vinylbenzyl chloride) benefits the fabrication of the AEMs with well-defined hydrophilic/hydrophobic phase-segregated structure, leading to a relative high hydroxide conductivity of 91.7 mS cm(-1) at 80 degrees C for FPBI-QPVC(2)(.5). The existence of a crosslinking structure endowed the as-prepared AEMs with relatively low water uptake and SR. Besides, the FPBI-QPVC(x) AEMs also have robust mechanical properties, high thermal decomposition temperature and good alkaline stability. Only 10.7% of conductivity loss was observed after soaking the ether-bond-free AEMs into 1 M a.q. KOH at 80 degrees C for 480 h. A maximum power density of 197.5 mW cm(-2) was determined by a single cell using FPBI-QPVC(2.5) AEM.

语种： 英文

作者： Li, Lingjun*;Yao, Qi;Liu, Jiequn;Ye, Kaibo;Liu, Boyu;...

期刊： FRONTIERS IN CHEMISTRY,2018年6(MAY):153 ISSN：2296-2646

通讯作者： Li, Lingjun;Zhang, Bao

作者机构： [Duan, Junfei; Yao, Qi; Yang, Huiping; Chen, Zhaoyong; Liu, Zengsheng; Liu, Boyu; Ye, Kaibo; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Li, Lingjun] Changsha Univ Sci & Technol, Hunan Prov Key Lab Efficient & Clean Energy Utili, Changsha, Hunan, Peoples R China.;[Liu, Jiequn] Soochow Univ, Sch Iron & Steel, Suzhou, Peoples R China.;[Zhang, Bao] Cent S Univ, Sch Met & Environm, Changsha, Hunan, Peoples R China.

通讯机构： [Li, Lingjun; Zhang, Bao] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha, Hunan, Peoples R China.;Changsha Univ Sci & Technol, Hunan Prov Key Lab Efficient & Clean Energy Utili, Changsha, Hunan, Peoples R China.;Cent S Univ, Sch Met & Environm, Changsha, Hunan, Peoples R China.

关键词： electrochemical kinetics;hollow multi-porous architecture;lithium-ion battery;superlattice structure;transition metal oxide

摘要： As a promising high-capacity anode material for Li-ion batteries, NiMn2O4 always suffers from the poor intrinsic conductivity and the architectural collapse originating from the volume expansion during cycle. Herein, a combined structure and architecture modulation is proposed to tackle concurrently the two handicaps, via a facile and well-controlled solvothermal approach to synthesize NiMn2O4/NiCo2O4 mesocrystals with superlattice structure and hollow multi-porous architecture. It is demonstrated that the obtained NiCo1.5Mn0.5O4 sample is made up of a new mixed-phase NiMn2O4/NiCo2O4 compound system, with a high charge capacity of 532.2 mAh g-1 with 90.4% capacity retention after 100 cycles at a current density of 1 A g-1. The enhanced electrochemical performance can be attributed to the synergistic effects of the superlattice structure and the hollow multi-porous architecture of the NiMn2O4/NiCo2O4 compound. The superlattice structure can improve ionic conductivity to enhance charge transport kinetics of the bulk material, while the hollow multi-porous architecture can provide enough void spaces to alleviate the architectural change during cycling, and shorten the lithium ions diffusion and electron-transportation distances. © 2018 Li, Yao, Liu, Ye, Liu, Liu, Yang, Chen, Duan and Zhang.

语种： 英文

作者： Duan, Junfei（段军飞）;Liu, Liang;Wu, Zhongying;Fang, Jianglin*;Chen, Dongzhong*

期刊： CrystEngComm,2018年20(28):4025-4035 ISSN：1466-8033

通讯作者： Chen, Dongzhong;Fang, Jianglin

作者机构： [Duan, Junfei] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410076, Hunan, Peoples R China.;[Duan, Junfei; Chen, Dongzhong; Liu, Liang; Wu, Zhongying] Nanjing Univ, Collaborat Innovat Ctr Chem Life Sci, Key Lab High Performance Polymer Mat & Technol, Minist Educ,Dept Polymer Sci & Engn,Sch Chem & Ch, Nanjing 210023, Jiangsu, Peoples R China.;[Fang, Jianglin] Nanjing Univ, Ctr Mat Anal, Nanjing 210093, Jiangsu, Peoples R China.

通讯机构： [Chen, Dongzhong; Fang, Jianglin] N;Nanjing Univ, Collaborat Innovat Ctr Chem Life Sci, Key Lab High Performance Polymer Mat & Technol, Minist Educ,Dept Polymer Sci & Engn,Sch Chem & Ch, Nanjing 210023, Jiangsu, Peoples R China.;Nanjing Univ, Ctr Mat Anal, Nanjing 210093, Jiangsu, Peoples R China.

摘要： Nanostructured materials of various shape and dimension have aroused intensive interests, among which copper(i) sulfide (Cu2S) nanomaterials are of particular prominence. In this work, various nanostructured Cu2S have been facilely prepared via solventless thermolysis, with well-controlled shape and dimension determined by and inherited from the layered structures of the azobenzene-containing single-source copper thiolate mesogenic precursors. The precursors with longer alkyl tails exhibit highly ordered layered liquid crystalline mesophases and retain persistent order up to temperatures beyond the clearing points. Under non-vacuum inert atmosphere or with further elevated temperature, large undulations of the constrained lamellar space result in significantly enhanced diffusion, migration and mass transfer, thus leading to the morphologies changing from one-dimensional (1D) ultrathin nanowires into thickened nanorods then to discrete 2D nanodisks. Based on a variety of modern techniques, especially in situ variable-temperature small angle X-ray scattering (SAXS), an extended universal “layered-precursor to lamellar-nanomaterial” (LPLM) mechanism has been proposed to account for the structural evolution of Cu2S nanomaterials. Our findings provide a novel pathway with clearer mechanism for well-controlled preparation of metal chalcogenides of various dimension and shape. In particular, the ultrathin Cu2S nanowires are anticipated to serve as fascinating semiconducting materials for various promising device applications. © The Royal Society of Chemistry.

语种： 英文

作者： Wei, Donghai;Zhong, Siyu;Zhang, Hang;Zhang, Xiaojia;Zhu, Chao;...

期刊： Electrochimica Acta,2018年290:312-321 ISSN：0013-4686

通讯作者： Duan, Junfei（段军飞）;Zhang, Guanhua

作者机构： [Duan, Junfei; Zhu, Chao; Chen, Zhaoyong; Liu, Peng; Wei, Donghai; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Zhang, Guanhua; Duan, Huigao; Zhang, Hang; Zhang, Xiaojia; Zhong, Siyu] Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Duan, Junfei] C;[Zhang, Guanhua] H;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Hunan Univ, Coll Mech & Vehicle Engn, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

关键词： SnO2;Nitrogen-doped carbon;Atomic layer deposition;Lithium ion battery;Full cell

摘要： A one-pot in situ pyrrole polymerization strategy, followed by controllable atomic layer deposition of TiO<inf>2</inf> and pyrolysis process, is carried out to construct the core-shell SnO<inf>2</inf>/NC@TiO<inf>2</inf> with sub-5 nm SnO<inf>2</inf> nanoparticles uniformly dispersing in interconnected nitrogen-doped carbon nanospheres coated by TiO<inf>2</inf> layer. Benefiting from the unique structural stability of SnO<inf>2</inf>/NC@TiO<inf>2</inf>, as anode materials for LIBs, they show much improved cycling stability and rate capability compared with the bare SnO<inf>2</inf> and SnO<inf>2</inf>/NC electrodes. Specifically, the SnO<inf>2</inf>/NC@TiO<inf>2</inf> electrode with a 10 nm TiO<inf>2</inf> coating layer demonstrate the optimal lithium ion storage performance, delivering initial discharge capacity of 1224 mAh g^&minus;1 with a first-cycle Columbic efficiency of 72.3% and 871 mAh g^&minus;1 after 200 cycles at 100 mA g^&minus;1. Moreover, the assembled SnO<inf>2</inf>/NC@TiO<inf>2</inf>//LiFePO<inf>4</inf> full cell demonstrates a good rate capability with a reversible capacity of 145 mAh g^&minus;1 (67% capacity retention of the initial value) when the electrode undergoes various current densities after 70 cycles. The improved electrochemical performance is mainly attributed to the surface interface engineering by the interconnected carbon matrix as well as the uniform TiO<inf>2</inf> outer layer. These achieved results suggest that interconnected SnO<inf>2</inf>/NC@TiO<inf>2</inf> electrodes have the potential to be used as anode for high-performance lithium ion battery.<br/> &copy;2018 Elsevier Ltd

语种： 英文

发明/设计人： 段军飞（段军飞）;魏东海;朱致英;朱超;吴应泷;...

申请/专利权人： 长沙理工大学

申请/专利号： CN201810142499.8

申请时间： 2018-02-11

公开号： CN108400300A

公开时间： 2018-08-14

主申请人地址： 410114 湖南省长沙市雨花区万家丽南路二段960号

摘要： 本发明公开了一种二氧化钛/氮掺杂碳包覆SnO2复合电极材料，该材料由核心和包覆在核心外表面的外壳层构成；所述核心为氮掺杂碳和SnO2组成复合材料；所述外壳层是二氧化钛。本发明具有核壳结构的二氧化钛/氮掺杂碳包覆SnO2复合电极材料的制备方法工艺简单，避开了水热、溶胶‑凝胶等繁琐的处理步骤，通过简单易行的室温聚合法即得到聚吡咯包覆的SnO2前驱体，随后通过原子层沉积技术和热处理便可制得具有核壳结构的二氧化钛/氮掺杂碳包覆SnO2复合电极材料，周期短，成本低廉，易于放大，适于产业化。

发明/设计人： 段军飞（段军飞）;吴应泷;朱超

申请/专利权人： 长沙理工大学

申请/专利号： CN201810711630.8

申请时间： 2018-07-03

公开号： CN108899507A

公开时间： 2018-11-27

主申请人地址： 410110 湖南省长沙市雨花区万家丽南路二段960号长沙理工大学

摘要： 本发明公开了一种具有核壳结构的双层碳包覆金属硫化物复合电极材料的制备方法。所诉复合电极材料外层为无定形碳材料，里层为氮掺杂碳包覆金属硫化物。本发明制备方法简单易行，通过室温聚合法即得聚吡咯包覆的Co9S8前驱体，随后以保护气为载气将乙醇均匀载入管式炉中进行热处理，即得到具有核壳结构双层碳包覆金属硫化物复合电极材料。上述方法制备的复合材料用作锂离子二次电池负极材料时，外层碳能够有效抑制活性材料金属硫化物与电解液的直接接触，提高了复合材料的首次库仑效率和循环性能，同时氮掺杂碳材料的引入，进一步提高了材料的导电性，缓解了充放电过程中金属硫化物产生的巨大体积膨胀，极大地改善了复合材料结构稳定性和倍率性能。

作者： Chen, Jie;Li, Lingjun*;Wu, Ling;Yao, Qi;Yang, Huiping;...

期刊： Journal of Power Sources,2018年406(Dec.1):110-117 ISSN：0378-7753

通讯作者： Li, Lingjun

作者机构： [Duan, Junfei; Yao, Qi; Yang, Huiping; Xia, Lingfeng; Chen, Zhaoyong; Liu, Zengsheng; Chen, Jie; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Li, Lingjun] Changsha Univ Sci & Technol, Hunan Prov Key Lab Modeling & Monitoring Near Ear, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Zhong, Shengkui; Wu, Ling] Soochow Univ, Sch Iron & Steel, Suzhou 215000, Peoples R China.

通讯机构： [Li, Lingjun] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.

关键词： Cathodes;Manganese oxide;Metal ions;Nickel oxide;Sodium compounds;Sodium-ion batteries;Stability;Cycling stability;Hybrid structure;Initial discharge capacities;Layered oxides;Long term stability;Nickel manganese oxide;Structural degradation;Structural stabilities;Phosphorus compounds

摘要： A critical challenge for the practical use of the layered O3-type binary nickel manganese oxides for sodium-ion batteries is the poor structural stability during extended cycling. The approaches of constructing O3/P2 hybrid composites can partially improve the cycling stability, but general approaches sacrifice the advantages of high capacity and low cost of the O3-type cathodes due to excessive sodium deficiency and lithium substitution. Here, we rationally design a serial of novel O3-majority hybrid Na0.9-xNi0.45Mn0.55O2 (x = 0.02, 0.04 and 0.08) cathodes, which exhibit high capacities while maintaining exceptional long-term stability. Particularly, the optimized O3/P2 Na0.88Ni0.45Mn0.55O2 composite delivers 106.7 mA h·g−1 with 71.1% capacity retention after 250 cycles at 1 C (1C = 150 mA g−1), the cyclability is 32% higher than that of the O3–Na0.9Ni0.45Mn0.55O2 cathode; and it also delivers a initial discharge capacity of 75.9 mA h·g−1, maintaining 72.4% capacity retention after 1000 cycles at 10 C. More importantly, the post-cycling analyses demonstrate O3/P2 hybrid phases successfully suppress the structural degradation of Na0.9Ni0.45Mn0.55O2 during battery operation. This study provides new perspectives in designing high performance cathodes for sodium-ion batteries. © 2018 Elsevier B.V.

语种： 英文

发明/设计人： 段军飞（段军飞）;魏东海;朱致英;朱超;吴应泷;...

申请/专利权人： 长沙理工大学

申请/专利号： CN201810142499.8

申请时间： 2018-02-11

公开号： CN108400300A

公开时间： 2018-08-14

摘要： 本发明公开了一种二氧化钛/氮掺杂碳包覆SnO2复合电极材料,该材料由核心和包覆在核心外表面的外壳层构成；所述核心为氮掺杂碳和SnO2组成复合材料；所述外壳层是二氧化钛。本发明具有核壳结构的二氧化钛/氮掺杂碳包覆SnO2复合电极材料的制备方法工艺简单,避开了水热、溶胶#凝胶等繁琐的处理步骤,通过简单易行的室温聚合法即得到聚吡咯包覆的SnO2前驱体,随后通过原子层沉积技术和热处理便可制得具有核壳结构的二氧化钛/氮掺杂碳包覆SnO2复合电极材料,周期短,成本低廉,易于放大,适于产业化。

作者： Duan, Junfei（段军飞）;Yuan, Song;Zhu, Chao;Chen, Zhaoyong*;Zhang, Guanhua;...

期刊： Synthetic Metals,2017年226:39-45 ISSN：0379-6779

通讯作者： Chen, Zhaoyong

作者机构： [Duan, Junfei; Zhu, Chao; Chen, Zhaoyong; Zhu, Zhiying; Yuan, Song; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Zhang, Guanhua; Duan, Huigao] Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.

关键词： Anode materials;Cu nanoparticles;Lithium ion batteries;N-doped carbon;Zinc oxide

摘要： Developing the advanced electrode materials with large capacity, low cost, high-rate capability and long cycle stability for lithium ion batteries (LIBs), is still a challenge and hot-topic today. Herein, ZnO/N-doped carbon/Cu composites (ZnO/NC/Cu) with different ZnO loading amounts are first synthesized by a simple pseudo-solid-state method only using the copper phthalocyanine as carbon, nitrogen and copper sources. In a typical massive-like structure, ZnO and Cu nanoparticles distribute randomly and are well surrounded by amorphous carbon. Benefiting from the advantages of intrinsic architecture, as LIBs anodes, ZnO/NC/Cu (1:1) exhibits a large specific capacity of 602&nbsp;mAh&nbsp;g^&minus;1at a current density of 100&nbsp;mA&nbsp;g^&minus;1, keeps a high up to 96% capacity retention even after 100 cycles vs the 2nd cycle, and presents high rate capability. It could be inferred that appropriated amount of ZnO, the modification of copper nanoparticles and N-doped carbon framework are mainly responsible for those encouraging electrochemical performances of ZnO/NC/Cu composites. &copy;2017 Elsevier B.V.

语种： 英文

作者： Duan, Junfei（段军飞）;Zhu, Chao;Du, Yuhui;Wu, Yinglong;Chen, Zhaoyong*;...

期刊： Journal of Materials Science,2017年52(17):10470-10479 ISSN：0022-2461

通讯作者： Chen, Zhaoyong

作者机构： [Duan, Junfei; Zhu, Chao; Zhu, Huali; Chen, Zhaoyong; Zhu, Zhiying; Du, Yuhui; Wu, Yinglong; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.

关键词： Anodes;Carbonization;Electrodes;Electron transport properties;Geometry;Graphene;Hybrid materials;Lithium;Lithium compounds;Lithium-ion batteries;Network architecture;Polypyrroles;Tin;Zinc;Electrical integrity;High-performance lithium-ion batteries;Hybrid electronic vehicles;Hydrothermal treatments;Lithiation/delithiation;Lithium storage properties;Reduced graphene oxides;Specific capacities;Doping (additives)

摘要： Developing the superior electrode materials with large reversible capacity, excellent rate capability and long cycling stability for high-performance lithium-ion batteries (LIBs) is highly desirable for electric vehicles and hybrid electronic vehicles. Herein, three-dimensional N-doped carbon (NC)-coated Zn–Sn mixed oxide (ZTO) cubes dispersed on reduced graphene oxide (ZTO@NC/RGO) composite are synthesized via a facile strategy combined with the hydrothermal treatment and carbonization of conductive polypyrrole. In this unique architecture, the ultrathin NC shells are interconnected through RGO and construct a continuous 3D conductive network, which provides a very efficient channel for electron transport. Furthermore, the flexible and high-conducting reduced graphene oxide and carbon shells can accommodate the mechanical stress induced by the volume change of ZTO cubes during lithiation as well as prohibit the aggregation of ZTO cubes, which would maintain the structural and electrical integrity of the ZTO@NC/RGO electrode during the lithiation/delithiation processes. Benefiting from the advantages of intrinsic architecture, as LIBs anodes, ZTO@NC/RGO exhibits enhanced lithium storage properties, delivering a large specific capacity of 732.8mAhg−1 at a current density of 100mAg−1 after 50 cycles, and presenting good rate capability. © 2017, Springer Science+Business Media New York.

语种： 英文