作者： 刘俊;郑世林;刘启明;严小艳;陈召勇

期刊： 电源技术,2020年44(6):812-814 ISSN：1002-087X

作者机构： 长沙理工大学材料科学与工程学院;[郑世林] 清远佳致新材料研究院有限公司;[严小艳; 陈召勇; 刘启明; 刘俊] 长沙理工大学

关键词： 锂离子电池;富锂锰正极材料;快速共沉淀法;草酸

摘要： 用草酸作为沉淀剂,采用快速共沉淀法成功合成了富锂锰正极材料,并探究了不同沉淀剂/过渡金属的配比对材料性能的影响.采用扫描电子显微镜(SEM)、X射线衍射(XRD)、充放电测试对其结构和电化学性能进行了表征.结果 表明,当配比为2∶1时,合成的富锂锰正极材料具有优异的结构稳定性和电化学性能,在0.1 C下首次放电比容量达到300.2 mAh/g,在1C下循环1 00次后仍然有98.5％的容量保持率.

语种： 中文

作者： Chen, Yangyang;Wang, Mingshan;Chen, Junchen;Yang, Jun;Li, Zhuangzhi;...

期刊： Materials Letters,2020年271(Jul.15):127771 ISSN：0167-577X

通讯作者： Li, Xing;Zheng, Jianming

作者机构： [Li, Zhuangzhi; Li, Xing; Wang, Mingshan; Yang, Jun; Chen, Junchen; Chen, Yangyang; Huang, Yun] Southwest Petr Univ, Sch New Energy & Mat, Chengdu 610500, Sichuan, Peoples R China.;[Chen, Zhaoyong] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.;[Zheng, Jianming; Zou, Yue] Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China.

通讯机构： [Li, Xing] S;[Zheng, Jianming] X;Southwest Petr Univ, Sch New Energy & Mat, Chengdu 610500, Sichuan, Peoples R China.;Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China.

关键词： Alumina;Aluminum oxide;Atomic layer deposition;Atoms;Cathode materials;Cathodes;Electrolytes;Lithium compounds;Manganese compounds;Microstructure;Nickel compounds;Passivation;Cycling stability;Electrochemical performance;Energy storage and conversions;High energy densities;Interfacial stabilities;Lithium ion diffusion;Passivation layer;Rate capabilities;Vanadium compounds

摘要： Although there have been many studies on atomic layer deposition of Al2O3 to improve the electrochemical performances of ternary cathode materials, few studies considered the harsh conditions such as high temperature and high voltage at the same time. In this work, the Al2O3 passivation layer is employed to coat the high nickel (Ni) LiNi0.68Co0.10Mn0.22O2 cathode through atomic layer deposition (ALD) approach. The Al2O3 coated LiNi0.68Co0.10Mn0.22O2 presents superior cycling stability and rate capability than the pristine at the cut-off voltage of 2.7–4.4 V under room temperature. Furthermore, under the harsh condition at high temperature of 60 °C or at high voltage of 2.7–4.8 V, the Al2O3 coated LiNi0.68Co0.10Mn0.22O2 also shows significantly improved performances than the pristine. The superior electrochemical performance of Al2O3 coated LiNi0.68Co0.10Mn0.22O2 could be attributed to the enhanced interfacial stability, the mitigated side reactions with electrolyte and the better maintained lithium ion diffusion kinetics. Manipulating the surface coating chemistry and evaluating the performance under harsh condition provide a useful approach for fast screening of effective surface modification technology, which might significantly advance the development of high energy density cathode materials. © 2020

语种： 英文

作者： Deng, Dunying;Chen, Zhaoyong;Hu, Yongle;Ma, Jin;Liu, Piao;...

期刊： Nanotechnology,2020年31(10):105705 ISSN：0957-4484

通讯作者： Tong, Yonggang

作者机构： [Chen, Zhaoyong; Deng, Dunying] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.;[Hu, Yongle; Tong, Yonggang] Changsha Univ Sci & Technol, Coll Automobile & Mech Engn, Changsha, Peoples R China.;[Ma, Jin] Changsha Adv Mat Ind Res Inst Co Ltd, Changsha, Peoples R China.;[Liu, Piao] Hunan LEED Elect Ink Co Ltd, Zhuzhou, Peoples R China.

通讯机构： [Tong, Yonggang] C;Changsha Univ Sci & Technol, Coll Automobile & Mech Engn, Changsha, Peoples R China.

关键词： Binders;Cellulose;Distillation;Fabrication;Frequency selective surfaces;Hydrogen peroxide;Ink;Ink jet printing;Metal nanoparticles;Oxidation;Peroxides;Reducing agents;Synthesis (chemical);Conductive ink;Fabrication process;Frequency selective surface (FSS);Reaction byproducts;Reflection resonance;Residual waters;Silver nanoparticles (AgNps);Vacuum distillation process;Silver nanoparticles;Binders;Cellulose;Construction;Distillation;Hydrogen Peroxide;Ink

摘要： A simple and green method for fabrication of nano silver conductive ink was developed for use in frequency selective surface (FSS). The hydrogen peroxide and ethyl cellulose were used as reducing agents and dispersants to synthesize silver nanoparticles (Ag NPs), and the ethyl cellulose was be used as binders of nano silver conductive ink eventually. The reaction byproducts of hydrogen peroxide are water and oxygen, the synthesized Ag NPs were be cleaned using purified water and alcohol without centrifugation and drying process. The conductive ink with 30 wt% silver content was formulated with the Ag NPs capped with ethyl cellulose, solvent and additive, the residual water and alcohol were be evaporated using vacuum distillation process. The prepared Ag NPs were characterized by SEM, XRD, TGA and FT-IR. The viscosity and surface tension of Ag NPs ink were tested, and the conductive ink was inkjet printed on Polyimide (PI) film to fabricate the FSS. The results showed the printed FSS had reflection resonances at 16.5 GHz and nulls deeper than the required-20 dB level, with depths of-32 dB. © 2019 IOP Publishing Ltd.

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： 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： 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： 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

作者： Zhu, Huali;Li, Qifeng;Gong, Xiaolong;Cao, Kaifeng;Chen, Zhaoyong*

期刊： Crystals,2018年8(11):425- ISSN：2073-4352

通讯作者： Chen, Zhaoyong

作者机构： [Zhu, Huali] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Zhu, Huali] Univ New Hampshire, Dept Chem, Durham, NH 03824 USA.;[Zhu, Huali] Univ New Hampshire, Mat Sci Program, Durham, NH 03824 USA.;[Cao, Kaifeng; Gong, Xiaolong; Chen, Zhaoyong; Li, Qifeng] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.

关键词： lithium nickel manganese cobalt oxide;chlorine and bromine co-doping;high voltage;cathode material;lithium-ion battery

摘要： The chlorine (Cl) and bromine (Br) co-doped lithium nickel manganese cobalt oxide (LiNi1/3Co1/3Mn1/3O2) was successfully synthesized by the molten salt method. The synthesized LiNi1/3Co1/3Mn1/3O2 compound demonstrates spherical morphology, which is formed by aggregated spherical-like or polygon primary particles. Halogen substitution would contribute to the growth of the primary particles. The LiNi1/3Co1/3Mn1/3O2 compound has the typical hexagonal layered structure, and no impurity phase is detected. The surface oxidation state of the compound is improved after Cl and Br substitution. Moreover, the Cl and Br co-doped LiNi1/3Co1/3Mn1/3O2 compound exhibits both improved rate capacity and cycle stability at a high voltage (4.6 V) compared with the pristine LiNi1/3Co1/3Mn1/3O2. The initial discharge capacities of Cl and Br co-doped LiNi1/3Co1/3Mn1/3O2 are 208.9 mAh g−1, 200.6 mAh g−1, 188.2 mAh g−1, 173.3 mAh g−1, and 157.1 mAh g−1 at the corresponding rates of 0.1C, 0.2C, 0.5C, 1C, and 3C respectively. The capacity retention at 1C after 50 cycles is increased from 81.1% to 93.2% by co-doping. The better contact between the electroactive particles of the electrode and the smaller resistance enhance the electric conductivity of the Cl and Br co-doped LiNi1/3Co1/3Mn1/3O2 cathode. The synthesized LiNi1/3Co1/3Mn1/3O2 is a promising cathode material for a high-power and large-capacity lithium-ion battery.

语种： 英文

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

作者： 李灵均;陈召勇;段军飞;宋刘斌;朱华丽

期刊： 科技资讯,2018年16(16):174-175 ISSN：1672-3791

作者机构： 长沙理工大学材料科学与工程学院 湖南长沙 410114;[陈召勇; 李灵均; 宋刘斌; 朱华丽; 段军飞] 长沙理工大学

关键词： 新能源材料与器件;大学生就业;人力资源

摘要： 为满足新能源开发与利用这一迫切需求,国家于2011年特别设立"新能源材料与器件"专业。本报告选取了三所不同类型、不同地域、具有不同行业背景且开办新能源材料与器件专业较早的高校,通过调研取得了这三所高校新能源材料与器件专业毕业生就业状况的一手资料,数据分析表明我国新能源材料与器件人才供不应求的局面将长期存在。

语种： 中文

作者： Xu, Ming;Fei, Linfeng;Lu, Wei;Chen, Zhaoyong;Li, Tao;...

期刊： Nano Energy,2017年35:271-280 ISSN：2211-2855

通讯作者： Lai, Yanqing;Huang, Haitao

作者机构： [Wang, Peng; Xu, Ming; Zhang, Zhian; Lai, Yanqing] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;[Liu, Yan; Fei, Linfeng; Li, Tao; Huang, Haitao; Xu, Ming] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China.;[Lu, Wei] Hong Kong Polytech Univ, Univ Res Facil Mat Characterizat & Device Fabrica, Kowloon, Hong Kong, Peoples R China.;[Chen, Zhaoyong] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410014, Hunan, Peoples R China.;[Gao, Guanyin] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.

通讯机构： [Lai, Yanqing] C;[Huang, Haitao] H;Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China.

关键词： Aligned Li-ion channels;Cathode;Controlled epitaxy;Li-ion battery;Spinel/layered composite

摘要： As a promising cathode material for Li-ion batteries (LIBs), Li-rich layered oxide (LLO) has attracted the most interest due to its superior performance and attractive characteristics, such as, extremely high capacity and energy density, low cost, and environmental friendliness. However, LLO cathode materials are facing a fundamental challenge of performance degradation as a result of the intrinsically poor rate capability and structural instability. Here we report the synthesis of high performance spinel/LLO heterostructured composite with aligned Li-ion channels by a composition modulated epitaxy method. The hetero-epitaxial nanostructure provides highly anisotropic Li-ion diffusion channels in spinel/LLO composite that significantly improve the electrochemical performance. Discharge capacities as high as 307, 282, 269, 227, 200mAhg−1 at 0.1, 0.5, 1.0, 3.0 and 5.0C rates, respectively, and reversible capacity of 286mAhg−1 after 100 cycles at 0.2C rate can be attained. This work sheds light on the comprehensive design of heterostructured composites for high-performance electrode applications and opens up new opportunities for next-generation LIBs. © 2017 Elsevier Ltd

语种： 英文

作者： 彭南发;许炼;朱华丽;徐明;陈召勇

期刊： 电源技术,2017年41(4):509-511 ISSN：1002-087X

作者机构： [彭南发; 许炼; 朱华丽; 徐明; 陈召勇] 长沙理工大学材料科学与工程学院, 湖南, 长沙, 410114

关键词： 镍钴锰酸锂;磷酸铁锂;正极材料;复合材料;锂离子电池

摘要： 对磷酸铁锂与镍钴锰酸锂复合正极材料的合成和电化学性能进行了研究。将磷酸铁锂与镍钴锰酸锂按照一定的质量比混合后得到复合正极材料。该复合材料结合了磷酸铁锂和镍钴锰酸锂的优点,表现出了优异的电化学性能。利用X射线衍射（XRD）、扫描电子显微镜（SEM）、充放电测试和交流阻抗等表征方法对复合正极材料进行了表征和分析。结果表明,磷酸铁锂与镍钴锰酸锂的质量百分比为30∶70时,该复合正极材料具有更优异的电化学性能。

语种： 中文

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

作者： Lingjun Li;Qi Yao;Huiping Yang;Ming Xu;Zhaoyong Chen

作者机构： [Lingjun Li; Qi Yao; Huiping Yang; Ming Xu; Zhaoyong Chen] School of Material Science and Engineering, Changsha University of Science and Technology

会议名称： 第二届中国（国际）能源材料化学研讨会

会议时间： 2017-06-09

会议地点： 中国湖南长沙

会议论文集名称： 第二届中国（国际）能源材料化学研讨会摘要集

摘要： <正>Nickel-rich layered oxide cathode materials for advanced lithium-ion batteries have received much attention recently because of their high specific capacities and significant reduction of cost.However,these cathodes are facing a fundamental challenge of loss in performance as a result of

语种： 中文