Research Progress on the Surface of High-Nickel Nickel-Cobalt-Manganese Ternary Cathode Materials: A Mini Review
作者：
Song, Liubin;Du, Jinlian;Xiao, Zhongliang* ;Jiang, Peng;Cao, Zhong;...
期刊：
FRONTIERS IN CHEMISTRY ,2020年8:580041 ISSN：2296-2646
通讯作者：
Xiao, Zhongliang
作者机构：
[Du, Jinlian; Jiang, Peng; Xiao, Zhongliang; Song, Liubin; Cao, Zhong] Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Sch Chem & Food Engn, Changsha, Peoples R China.;[Zhu, Huali] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha, Peoples R China.
通讯机构：
[Xiao, Zhongliang] C;Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Sch Chem & Food Engn, Changsha, Peoples R China.
关键词：
Lithium ion battery;high nickel type;Ternary cathode material;surface;core-shell
摘要：
To address increasingly prominent energy problems, lithium-ion batteries have been widely developed. The high-nickel type nickel–cobalt–manganese (NCM) ternary cathode material has attracted attention because of its high energy density, but it has problems such as cation mixing. To address these issues, it is necessary to start from the surface and interface of the cathode material, explore the mechanism underlying the material's structural change and the occurrence of side reactions, and propose corresponding optimization schemes. This article reviews the defects caused by cation mixing and energy bands in high-nickel NCM ternary cathode materials. This review discusses the reasons why the core-shell structure has become an optimized high-nickel ternary cathode material in recent years and the research progress of core-shell materials. The synthesis method of high-nickel NCM ternary cathode material is summarized. A good theoretical basis for future experimental exploration is provided. © Copyright © 2020 Song, Du, Xiao, Jiang, Cao and Zhu.
语种：
英文
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Enhanced electrochemical properties of Ni-rich LiNi0.8Co0.1Mn0.1O2 by SnO2 coating under high cutoff voltage
作者：
Song, Liubin;Li, Anxian;Xiao, Zhongliang* ;Chi, Zhenzhen;Cao, Zhong;...
期刊：
Ionics ,2020年26(6):2681-2688 ISSN：0947-7047
通讯作者：
Xiao, Zhongliang
作者机构：
[Chi, Zhenzhen; Li, Anxian; Xiao, Zhongliang; Song, Liubin; Cao, Zhong] Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Sch Chem & Food Engn, Changsha 410004, Hunan, Peoples R China.;[Zhu, Huali] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Xiao, Zhongliang] C;Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Sch Chem & Food Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Cathodes;Coatings;Cobalt compounds;Lithium compounds;Lithium-ion batteries;Manganese compounds;Scanning electron microscopy;Transmission electron microscopy;Cut-off voltages;High energy densities;High-temperature calcination;Layered oxide cathodes;LiNi0.8Co0.1Mn0.1O2;SnO2;Structural instability;Surface coatings;Nickel compounds
摘要：
Extending the working voltage is an effective approach to enhance the reversible capacity of LiNi1-x-yCoxMnyO2 layered oxide cathode materials. However, the layered Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode suffers a severe structural instability and rapid capacity decrease during high-voltage cycling (4.6 V). In order to solve these problems, the surface coating layer of SnO2 is successfully prepared via a one-step synthesis way followed with a high temperature calcination method. The 1.0% SnO2-modified LiNi0.8Co0.1Mn0.1O2 delivers a much higher capacity retention (83.63%) compared with pristine sample (71.58%) after 100 cycles at 1 C under 4.6 V. The coating properties of SnO2-coated LiNi0.8Co0.1Mn0.1O2 are probed via X-ray diffraction, scanning electron microscope, and transmission electron microscope. Our results provide a skillful approach to obtain the promising high performance of cathode materials with both high energy density and long calendar life to satisfy the growing demands of future lithium-ion battery.
语种：
英文
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Sn-doping and Li2SnO3 nano-coating layer co-modified LiNi0.5Co0.2Mn0.3O2 with improved cycle stability at 4.6 V cut-off voltage
作者：
Zhu, Huali;Shen, Rui;Tang, Yiwei;Yan, Xiaoyan;Liu, Jun;...
期刊：
Nanomaterials ,2020年10(5):868 ISSN：2079-4991
通讯作者：
Chen, Zhaoyong
作者机构：
[Fan, Zhiqiang; Zhu, Huali; Shen, Rui] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.;[Zheng, Shilin; Tang, Yiwei] Qinyuan Jiazhi Inst Co Ltd, Qingyuan 511517, Peoples R China.;[Yan, Xiaoyan; Chen, Zhaoyong; Liu, Jun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.;[Song, Liubin] Changsha Univ Sci & Technol, Sch Chem & Food Engn, Changsha 410114, Peoples R China.
通讯机构：
[Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.
关键词：
LiNi0.5Co0.2Mn0.3O2;Sn-modification;cathode material;high cut-off voltage;lithium-ion batteries
摘要：
Nickel-rich layered LiNi1-x-yCoxMnyO2 (LiMO2) is widely investigated as a promising cathode material for advanced lithium-ion batteries used in electric vehicles, and a much higher energy density in higher cut-off voltage is emergent for long driving range. However, during extensive cycling when charged to higher voltage, the battery exhibits severe capacity fading and obvious structural collapse, which leads to poor cycle stability. Herein, Sn-doping and in situ formed Li2SnO3 nano-coating layer co-modified spherical-like LiNi0.5Co0.2Mn0.3O2 samples were successfully prepared using a facile molten salt method and demonstrated excellent cyclic properties and high-rate capabilities. The transition metal site was expected to be substituted by Sn in this study. The original crystal structures of the layered materials were influenced by Sn-doping. Sn not only entered into the crystal lattice of LiNi0.5Co0.2Mn0.3O2, but also formed Li+-conductive Li2SnO3 on the surface. Sn-doping and Li2SnO3 coating layer co-modification are helpful to optimize the ratio of Ni2+ and Ni3+, and to improve the conductivity of the cathode. The reversible capacity and rate capability of the cathode are improved by Sn-modification. The 3 mol% Sn-modified LiNi0.5Co0.2Mn0.3O2 sample maintained the reversible capacity of 146.8 mAh g−1 at 5C, corresponding to 75.8% of its low-rate capacity (0.1C, 193.7mAh g−1) and kept the reversible capacity of 157.3 mAh g−1 with 88.4% capacity retention after 100 charge and discharge cycles at 1C rate between 2.7 and 4.6 V, showing the improved electrochemical property. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
语种：
英文
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“电子与光电子材料”课程教学改革浅析
作者：
朱华丽
期刊：
科教导刊 ,2020年(20):100-101 ISSN：1674-6813
作者机构：
长沙理工大学物理与电子科学学院 湖南·长沙 410114;[朱华丽] 长沙理工大学
关键词：
电子材料;光电子材料;教学研究
摘要：
电子和光电子材料对于现代信息技术的发展起着至关重要的作用。本文基于"电子与光电子材料"课程教学现状,从教材的选择和教学内容安排、教学方法含课程考核等方面进行了有益的探讨。提出将学科融合应用到教学实践,引进最新的科研成果,灵活运用多媒体教学优势,结合实物教学和专题研讨,提高课堂教学效果,培养学生自主性和研究性学习能力。
语种：
中文
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Mesoporous Si/C composite anode material: experiments and first-principles calculations
作者：
Xiao, Zhongliang;Xia, Ni;Song, Liubin* ;Cao, Zhong;Zhu, Huali
期刊：
Ionics ,2020年26(2):589-599 ISSN：0947-7047
通讯作者：
Song, Liubin
作者机构：
[Xia, Ni; Xiao, Zhongliang; Song, Liubin; Cao, Zhong] Changsha Univ Sci & Technol, Sch Chem & Food Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410004, Hunan, Peoples R China.;[Zhu, Huali] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Song, Liubin] C;Changsha Univ Sci & Technol, Sch Chem & Food Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410004, Hunan, Peoples R China.
关键词：
Amines;Anodes;Calculations;Coated materials;Energy gap;Expansion;Graphene;Lithium-ion batteries;Molten materials;Silica;Anode material;Coated composites;First-principles calculation;Initial Coulombic efficiency;Magnesiothermic reduction;Mesoporous carbon;Mesoporous silicon;Mesoporous structures;Mesoporous materials
摘要：
Carbon-coated and doped mesoporous silicon/carbon (m-Si/C) composites were successfully prepared via carbon coating and molten magnesiothermic reduction by using mesoporous silica (SBA-15) and dopamine as raw materials. Experimental results were theoretically verified by first-principles calculation. The obtained m-Si/C composites exhibited a high initial Coulombic efficiency of 73% at 0.1Ag−1 and an excellent cycling stability with 617.5mAhg−1 capacity after 100cycles at 0.1Ag−1. This excellent performance was attributed to the combination of carbon and the mesoporous structure of SBA-15 to form a mesoporous carbon framework which could improve the stability and conductivity of the material. The oxygen defects that formed after molten magnesiothermic reduction could effectively alleviate the change in the volume of the Si core and shorten the diffusion path of Li+ in the Si core. Graphene layers could effectively reduce the energy of the system and the band gap, the embedding of Li+ would lead to the expansion and distortion of Si, and the carbon layer with elasticity and hardness could buffer the volume expansion of m-Si/C composites. Consistent with experimental results, theoretical results demonstrated that graphene-coated composites positively affected the Li storage of Si. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种：
英文
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锂离子电池硅基负极材料研究进展
作者：
肖忠良;夏妮;宋刘斌;曹忠;朱华丽
期刊：
电源技术 ,2019年43(1):154-157 ISSN：1002-087X
作者机构：
长沙理工大学化学与生物工程学院,湖南长沙,410004;长沙理工大学物理与电子科学学院,湖南长沙,410004;[肖忠良; 曹忠; 宋刘斌; 夏妮; 朱华丽] 长沙理工大学
关键词：
锂离子电池;负极材料;硅基材料
摘要：
锂离子二次电池是迄今发展最为迅速的化学电源之一,并以其特有的优点如循环性能好、自放电小及库仑效率高等成为人们研究的热点,提高锂离子电池电化学性能的关键是选取性能良好的正负极材料。硅基材料作为锂离子电池负极材料具有极高的比容量,但硅负极在充放电过程时体积变化巨大和电导率低限制了其应用。目前,改善硅材料性能的方法主要有:材料纳米化、结构特殊化以及复合化。对锂离子电池硅基负极材料改性方法的最新研究进展进行了综述,并展望了硅基负极材料的应用前景。
语种：
中文
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High Performance and Structural Stability of K and Cl Co-Doped LiNi0.5Co0.2Mn0.3O2 Cathode Materials in 4.6 Voltage.
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
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Improved Electrochemical Performance of Surface Coated LiNi0.80Co0.15Al0.05O2 With Polypyrrole
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
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Enhanced High Voltage Performance of Chlorine/Bromine Co-Doped Lithium Nickel Manganese Cobalt Oxide
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
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锂离子电池正极材料LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2研究进展
作者：
宋刘斌;李新宇;肖忠良;曹忠;朱华丽
期刊：
功能材料 ,2017年48(12):12023-12029,12035 ISSN：1001-9731
通讯作者：
Xiao, Z.
作者机构：
[曹忠; 李新宇; 宋刘斌; 肖忠良] School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410004, China;[朱华丽] School of Physics and Electronic Engineering, Changsha University of Science and Technology, Changsha, 410004, China
通讯机构：
[Xiao, Z.] S;School of Chemistry and Biological Engineering, China
关键词：
包覆;掺杂;热电化学;数据模拟
摘要：
三元正极材料LiNi0.5Co0.2Mn0.3O2具有能量密度大、比容量高、成本低等优点,已基本实现产业化。但该材料的容量保持率低和热稳定性能差阻碍了其全面快速的发展。综述了制备工艺的优化、掺杂和包覆等改性方法对三元正极材料性能的影响,重点介绍了热电化学和数值模拟的研究现状和应用。
语种：
中文
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富锂锰正极材料的制备与表面改性
作者：
严小艳;徐明;朱华丽;段军飞
（ ;陈召勇
作者机构：
[段军飞; 严小艳; 徐明; 朱华丽; 陈召勇] 长沙理工大学物理与电子科学学院;[段军飞; 严小艳; 徐明; 朱华丽; 陈召勇] 长沙理工大学新能源与动力电池研究所
会议名称：
中国化学会第30届学术年会-第三十分会：化学电源
会议时间：
2016-07-01
会议地点：
中国辽宁大连
关键词：
锂离子电池;正极材料;富锂层状氧化物;溶胶凝胶法;表面包覆
摘要：
富锂锰层状氧化物正极材料(LLMO)具有电化学容量高(>250 mAh/g),工作电压高,成本低和环境友好等特点。然而,LLMO正极材料也存在倍率容量低、循环性能差等缺点。针对以上这些问题,本文以溶胶凝胶法(Sol-gel)制备了LLMO正极材料,并对其进行表面包覆改性研究。以葡萄糖,蔗糖和柠檬酸作为络合剂采用溶胶凝胶阀制备了LLMO正极材料,试验结果分析表明,以蔗糖作为络合剂制备出的LLMO正极
语种：
中文
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Effect of Al substitution sites on Li1-x Alx (Ni0.5 Co0.2 Mn0.3 )1-y Aly O2 cathode materials for lithium ion batteries
作者：
Li, Lingjun;Yao, Qi;Zhu, Huali* ;Chen, Zhaoyong* ;Song, Liubin;...
期刊：
Journal of Alloys and Compounds ,2016年686:30-37 ISSN：0925-8388
通讯作者：
Zhu, Huali;Chen, Zhaoyong
作者机构：
[Duan, Junfei; Yao, Qi; Zhu, Huali; Chen, Zhaoyong; Li, Lingjun] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Song, Liubin] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Hunan Prov Key Lab Materi Protect Elect Power & T, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhu, HL; Chen, ZY] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
关键词：
Cathodes;Electric batteries;Electrodes;Ions;Lithium;Lithium alloys;Lithium compounds;Lithium-ion batteries;Manganese;Nickel;Stability;Transition metal compounds;Transition metals;X ray diffraction;X ray photoelectron spectroscopy;Al substitution;Dopant concentrations;Electrochemical performance;Electrochemical test;LiNi0.5Co0.2Mn0.3O2;Lithium ion diffusion;Structural stabilities;Transition metal layers;Aluminum
摘要：
The effects of various Al concentration and substitution sites (including Li layer and transition metal layer) on the structural and electrochemical properties of LiNi0.5Co0.2Mn0.3O2 (NMC) materials are systematically investigated. X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical tests confirm that LiAlO2 phase appears in Li1-xAlxNi0.5Co0.2Mn0.3O2 samples and contributes to better lithium ion diffusion coefficient. While Al prefer to form Al-O solid solution in Li(Ni0.5Co0.2Mn0.3)1-yAlyO2 samples, which can improve the structural stability of NMC. As expected, Al substituted samples with suitable dopant concentration exhibit remarkably enhanced electrochemical performances compared with pristine LiNi0.5Co0.2Mn0.3O2. Particularly, the Li0.99Al0.01Ni0.5Co0.2Mn0.3O2 sample maintains 172.3 mAh g-1 (1 C) with 90.9% capacity retention after 100 high-voltage cycles at 4.6 V charge cut-off. These results demonstrate that substitution of Li with low Al content has superior advantages for LiNi0.5Co0.2Mn0.3O2 cathodes. © 2016 Elsevier B.V.
语种：
英文
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Effect of electrode twisting on electronic transport properties of atomic carbon wires
作者：
Fan, Z. Q.* ;Zhang, Z. H.;Deng, X. Q.;Tang, G. P.;Yang, C. H.;...
期刊：
Carbon ,2016年98:179-186 ISSN：0008-6223
通讯作者：
Fan, Z. Q.
作者机构：
[Zhu, H. L.; Tang, G. P.; Fan, Z. Q.; Zhang, Z. H.; Sun, L.; Deng, X. Q.; Yang, C. H.] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Fan, Z. Q.] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
摘要：
We investigate the electron transport properties in atomic carbon wires between two zigzag graphene nanoribbon (ZGNR) electrodes by applying nonequilibrium Green's functions in combination with the density-functional theory. It shows that the ZGNR electrode twisting can modulate the conductance of the atomic carbon wire-graphene junctions remarkably. Typical currents of devices with odd carbon wires are much higher than currents of devices with even carbon wires to exhibit even-odd behavior. The negative differential resistance behaviors are only found in the devices with odd carbon wires. When the right ZGNR electrode is twisted, the curvatures of the current-voltage characteristics change remarkably upon twisted angles. The current will decrease by up to 5 orders of magnitude when the twisted angle reaches to 90°. That means the atomic carbon wire-graphene junctions can be made as a mechanical switching. © 2015 Elsevier Ltd. All rights reserved.
语种：
英文
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合成时间对LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2结构与电化学性能的影响
作者：
陈召勇;谢添;李灵均;朱华丽;王文华
期刊：
电源技术 ,2015年39(6):1179-1182 ISSN：1002-087X
作者机构：
[陈召勇; 谢添; 李灵均; 朱华丽; 王文华] 长沙理工大学物理与电子科学学院;长沙理工大学电力与交通材料保护湖南省重点实验室
关键词：
锂离子电池;正极材料;合成时间
摘要：
采用球形Ni_(0.5)Co_(0.2)Mn_(0.3)(OH)_2前驱体与Li_2CO_3混合,通过高温烧结合成层状LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2正极材料,研究了合成时间对材料结构及电化学性能的影响。扫描电子显微镜法(SEM)表明LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2正极材料与前驱体形貌均为理想的球形。X射线衍射光谱法(XRD)分析表明,在不同合成时间下合成的样品均为具有层状结构的纯相物质。电化学性能测试表明,900℃12 h合成的样品具有最优的电化学性能,在2.7~4.4V电压区间,0.1 C、1 C、5 C的首次放电比容量分别达到195.2、158.4和114.9 mAh/g,1 C循环10次容量保持率为98.9%。
语种：
中文
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Effects of lithium-active manganese trioxide coating on the structural and electrochemical characteristics of LiNi0.5Co0.2Mn0.3O2 as cathode materials for lithium ion battery
作者：
Li, Lingjun;Yao, Qi;Chen, Zhaoyong* ;Song, Liubin;Xie, Tian;...
期刊：
Journal of Alloys and Compounds ,2015年650:684-691 ISSN：0925-8388
通讯作者：
Chen, Zhaoyong
作者机构：
[Duan, Junfei; Yao, Qi; Zhu, Huali; Chen, Zhaoyong; Xie, Tian; Li, Lingjun] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Zhang, Kaili; Li, Lingjun] City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China.;[Song, Liubin] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
关键词：
Cathodes;Coated materials;Cobalt compounds;Coremaking;Diffusion coatings;Electrolytes;Lithium-ion batteries;Manganese compounds;Nickel compounds;pH;Scanning electron microscopy;Sol-gel process;Sol-gels;Spectrometers;Transmission electron microscopy;Cath-ode materials;Cycling performance;Electrochemical characteristics;Electrochemical test;Energy dispersive spectrometers;Li2MnO3-coated;LiNi0.5Co0.2Mn0.3O2;pH value;Lithium compounds
摘要：
Li2MnO3-coated LiNi0.5Co0.2Mn0.3O2 materials are successfully synthesized by sol-gel method. The effects of various pH values and Li2MnO3 contents on the structural and electrochemical properties of LiNi0.5Co0.2Mn0.3O2 cathode materials are systematically investigated, respectively. Scanning electron microscope, transmission electron microscope and energy dispersive spectrometer confirm that the particles of LiNi0.5Co0.2Mn0.3O2 are completely coated by crystalline Li2MnO3 phase. Electrochemical tests show that suitable Li2MnO3-coated samples exhibit higher rate capacity and better cycling performance than those of the pristine one. This improvement can be attributed to the synergetic contribution from the neutral pH value and appropriate Li2MnO3 amount. The neutral pH environment can protect the core material from damaging during the coating process and is conducive to relieving the rapid moisture uptaking problem of LiNi0.5Co0.2Mn0.3O2. While, suitable Li2MnO3 coating can protect the bulk from directly contacting the electrolyte and offer a fast Li+ diffusion path at the interface of bulk and electrolyte. © 2015 Elsevier B.V.
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论地方高校教育国际化建设
作者：
李灵均;段军飞;龚丽;陈召勇;朱华丽
期刊：
科技创新导报 ,2015年(27):216-217 ISSN：1674-098X
作者机构：
长沙理工大学物理与电子科学学院 湖南长沙 410114;[陈召勇; 李灵均; 龚丽; 朱华丽; 段军飞] 长沙理工大学
关键词：
高等教育;国际化建设;教学改革;地方高校
摘要：
该文分析和总结了近年来国内外国际化教育的发展,阐述了地方高校国际化教育的重要性,并以长沙理工大学国际化建设为例,提出了教育国际化的目标及实施方案。通过建立国际化的办学理念,开展课程体系及教学国际化,鼓励和帮助教师出国深造,培养国际化的校园氛围等措施,让高校学子接受国际化教育,为培养出更多具有国际化视野、国际活动和沟通能力、创新能力和专业知识强的国家建设后备人才提供支持,为增强我国的世界竞争力提供保障。
语种：
中文
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Characterization and electrochemical performance of lithium-active titanium dioxide inlaid LiNi0.5Co0.2Mn0.3O2 material prepared by lithium residue-assisted method
作者：
Li, Lingjun;Chen, Zhaoyong* ;Song, Liubin;Xu, Ming;Zhu, Huali;...
期刊：
Journal of Alloys and Compounds ,2015年638:77-82 ISSN：0925-8388
通讯作者：
Chen, Zhaoyong
作者机构：
[Zhu, Huali; Chen, Zhaoyong; Xu, Ming; Li, Lingjun; Gong, Li] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Zhang, Kaili; Li, Lingjun] City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China.;[Song, Liubin] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
关键词：
Characterization;Diffusion;Fast Fourier transforms;High resolution transmission electron microscopy;Lithium;Lithium alloys;Lithium compounds;Lithium-ion batteries;Spectrometers;X ray diffraction;Electrochemical performance;Electrochemical test;Energy dispersive spectrometers;Gradient distributions;LiNi0.5Co0.2Mn0.3O2;LiTiO2-inlaid;Reversible capacity;Surface electronic conductivity;Manganese
摘要：
The lithium residues are consumed as raw materials to in-situ synthesize the LiTiO2-inlaid LiNi0.5Co0.2Mn0.3O2composites. The effects of various LiTiO2contents on the morphology, structure, and electrochemical properties of LiNi0.5Co0.2Mn0.3O2materials are investigated in detail. Energy dispersive spectrometer mapping, high-resolution transmission electron microscopy and fast Fourier transform analysis confirm that the spherical particles of LiNi0.5Co0.2Mn0.3O2are completely coated by crystalline LiTiO2phase; X-ray diffraction, cross-section SEM and corresponding EDS results indicate that Ti ions are also doped into the bulk LiNi0.5Co0.2Mn0.3O2with gradient distribution. Electrochemical tests show that the LiTiO2-inlaid samples exhibit excellent reversible capacity, enhanced cyclability, superior lithium diffusion coefficient and rate properties. Specially, the 3 mol% LiTiO2inlaid sample maintains 153.7 mA h g-1with 94.4% capacity retention after 100 cycles between 2.7-4.4 V at 1 C, take 30% advantage than that of the pristine one (118.2 mA h g-1). This improvement can be attributed to the removal of lithium residues and suitable LiTiO2inlaying. The absence of lithium residue is helpful to retard the decomposition of LiPF6. While, suitable LiTiO2inlaying can protect the bulk from directly contacting the electrolyte, buffer the volume change of core and shell during cycles, increase the surface electronic conductivity and offer a 3D path for Li+diffusion from the bulk to interface. © 2015 Elsevier B.V. All rights reserved.
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英文
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Mitigating capacity fade by constructing highly ordered mesoporous Al2O3/polyacene double-shelled architecture in Li-rich cathode materials
作者：
Xu, Ming;Chen, Zhaoyong* ;Zhu, Huali;Yan, Xiaoyan;Li, Lingjun;...
期刊：
Journal of Materials Chemistry A ,2015年3(26):13933-13945 ISSN：2050-7488
通讯作者：
Chen, Zhaoyong
作者机构：
[Yan, Xiaoyan; Zhu, Huali; Chen, Zhaoyong; Xu, Ming; Li, Lingjun; Zhao, Qunfang] Changsha Univ Sci & Technol, Sch Phys & Elctron Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Phys & Elctron Sci, Changsha 410004, Hunan, Peoples R China.
摘要：
Lithium-rich layered oxides, xLi<inf>2</inf>MnO<inf>3</inf>·(1 - x)LiMO<inf>2</inf>(M = Ni, Mn, Co), have been considered as one of the most promising cathode active materials for rechargeable lithium-ion batteries due to their high capacity over 250 mA h g<sup>-1</sup>between 2.0 and 4.8 V. However, the commercialized application of these cathodes has so far been hindered by their severe capacity fading and transition metal dissolution during high voltage cycling (>4.5 V vs. Li/Li<sup>+</sup>). To overcome this barrier, a double-shelled architecture consisting of an inner conductive polyacene layer and an outer mesoporous Al<inf>2</inf>O<inf>3</inf>layer is constructed. A polyacene layer with high electron conductivity is first coated on the surface of a 0.5Li<inf>2</inf>MnO<inf>3</inf>·0.5LiNi<inf>0.5</inf>Co<inf>0.2</inf>Mn<inf>0.3</inf>O<inf>2</inf>cathode material, followed by a hydrothermal method combined with an in-sol treatment to produce a highly ordered mesoporous Al<inf>2</inf>O<inf>3</inf>layer. Compared to previous studies, this double-shelled architecture has substantially improved the electrochemical performance of the 0.5Li<inf>2</inf>MnO<inf>3</inf>·0.5LiNi<inf>0.5</inf>Co<inf>0.2</inf>Mn<inf>0.3</inf>O<inf>2</inf>cathode material. Two striking characteristics are obtained for this double-shelled lithium-rich layered oxide cathode material: (1) the electrochemical capacity is greatly improved, reaching 280 mA h g<sup>-1</sup>(2.0 V-4.8 V at 0.1 C) and (2) the transition from the layered phase to spinel is delayed, leading to a superior capacity retention of 98% after the 100<sup>th</sup>cycle. This journal is ©The Royal Society of Chemistry.
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英文
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High-performance lithium-rich layered oxide materials: Effects of chelating agents on microstructure and electrochemical properties
作者：
Li, Lingjun;Xu, Ming;Chen, Zhaoyong* ;Zhou, Xiang;Zhang, Qiaobao;...
期刊：
Electrochimica Acta ,2015年174:446-455 ISSN：0013-4686
通讯作者：
Chen, Zhaoyong
作者机构：
[Zhu, Huali; Chen, Zhaoyong; Xu, Ming; Li, Lingjun] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.;[Zhang, Qiaobao; Wu, Chun; Zhou, Xiang; Zhang, Kaili; Li, Lingjun] City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China.
通讯机构：
[Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
关键词：
Lithium-ion battery;Cathode material;Lithium-rich layered oxide;Chelating agent
摘要：
The mechanisms and effects of three typical chelating agents, namely glucose, citric acid and sucrose on the sol-gel synthesis process, electrochemical degradation and structural evolution of 0.5Li(2)MnO(3)center dot 0.5LiNi(0.5)Co(0.2)Mn(0.3)O(2) (LLMO) materials are systematically compared for the first time. X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy analysis indicate that the sample synthesized from sucrose owns well structure, homogenous distribution, low Ni3+ concentration and good surface structural stability during cycling, respectively. Electrochemical tests further prove that the LLMO material obtained from sucrose maintains 258.4 mAh g(-1) with 94.8% capacity retention after 100 cycles at 0.2 C. The superior electrochemical performance can be ascribed to the exceptional complexing mechanism of sucrose, compared to those of the glucose and citric acid. Namely, one mole sucrose can be hydrolyzed into two different monosaccharides and further chelates three M (Li, Ni, Co and Mn) ions to form a more uniform ion-chelated matrix during sol-gel process. This discovery is an important step towards understanding the selection criterion of chelating agents for sal-gel method, that chelating agent with excellent complexing capability is beneficial to the distribution, structural stability and electrochemical properties of advanced lithium-rich layered materials. (C) 2015 Elsevier Ltd. All rights reserved.
语种：
英文
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Highly crystalline alumina surface coating from hydrolysis of aluminum isopropoxide on lithium-rich layered oxide
作者：
Xu, Ming;Chen, Zhaoyong* ;Li, Lingjun;Zhu, Huali;Zhao, Qunfang;...
期刊：
Journal of Power Sources ,2015年281:444-454 ISSN：0378-7753
通讯作者：
Chen, Zhaoyong
作者机构：
[Zhu, Huali; Chen, Zhaoyong; Xu, Lian; Xu, Ming; Peng, Nanfa; Li, Lingjun; Gong, Li; Zhao, Qunfang] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[Chen, Zhaoyong] C;Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Hunan, Peoples R China.
关键词：
Alumina;Aluminum;Aluminum coatings;Cathodes;Coated materials;Coatings;Cobalt;Crystalline materials;Electric batteries;Electrodes;Hydrolysis;Ions;Lithium;Lithium alloys;Lithium compounds;Lithium-ion batteries;Manganese;Manganese oxide;Secondary batteries;Sol-gel process;Sol-gels;Sugar (sucrose);Alumina coating;Aluminum isopropoxides;Cath-ode materials;Discharge capacities;Environmental benignity;High-performance lithium-ion batteries;High-voltage cycling;Lithium-rich layered oxides;Lithium batteries
摘要：
(Figure Presented) Lithium-rich layered oxides, xLi2MnO3·(1-x)LiMO2(M = Ni, Mn, Co), have been under intense investigation as high-performance cathode materials for lithium ion batteries due to their high discharge capacity, low cost and environmental benignity. Unfortunately, the commercialized application of these cathode materials have so far been hindered by their severe capacity and voltage fading during high voltage cycling (>4.5 V vs. Li/Li+). In an attempt to overcome these problems, herein, highly crystalline Al2O3 layer from the hydrolysis of aluminum isopropoxide are coated on 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 with controlling the growth of Al2O3 crystals. The coin cell with bare cathode material delivers a high discharge capacity over 268.2 mAh g-1 between 2.0 V and 4.8 V, while the Al2O3 coated cathode material shows the excellent cycling stability corresponding to 98% capacity retention after 100 cycles at 1C. More importantly, the highly crystalline Al2O3 coated cathode materials exhibit a significantly lower discharge voltage decay compared to the bare cathode materials, which could be ascribed to the suppression of the layered-to-spinel transformation by compact and highly crystalline Al2O3 layer. The results here will shed light on developing cathode materials with special structures and superior electrochemical properties for high-performance lithium ion batteries. © 2015 Elsevier B.V. All rights reserved.
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