Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi2MnO3-(1-x)LiMO2 cathode material

doi:10.11949/j.issn.0438-1157.20151501

CIESC Journal ›› 2016, Vol. 67 ›› Issue (7): 2950-2955.DOI: 10.11949/j.issn.0438-1157.20151501

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Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi₂MnO₃-(1-x)LiMO₂ cathode material

PENG Jiming¹, CHEN Yuhua², LIU Shicheng², HU Sijiang¹, WANG Hongqiang^1,2, LI Qingyu²

1. Hubei Key Laboratory for Processing and Application of Catalytic Materials, College of Chemical Engineering, Huanggang Normal University, Huanggang 438000, Hubei, China;
2. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, Guangxi, China

Received:2015-09-28 Revised:2016-03-17 Online:2016-07-05 Published:2016-07-05
Supported by:
supported by the National Natural Science Foundation of China (51474110, 51364004) and the Outstanding Young Science and Technology Innovation Team Program of Hubei Provincial Colleges and Universities (T201514).

不同镍钴锰比对xLi₂MnO₃-(1-x)LiMO₂正极材料的结构和电化学性能的影响

彭继明¹, 陈玉华², 刘世成², 胡思江¹, 王红强^1,2, 李庆余²

1. 黄冈师范学院化工学院, 催化材料制备及应用湖北省重点实验室, 湖北黄冈 438000;
2. 广西师范大学化学与药学学院, 低碳能源材料广西重点实验室, 广西桂林 541004

通讯作者: 胡思江
基金资助:
国家自然科学基金项目（51474110，51364004）；湖北省高等学校优秀中青年科技创新团队计划（T201514）。

Abstract

Abstract:

Li-rich layered cathode materials were synthesized by a facile co-precipitation method with NaOH and NH₃·H₂O. The effect of Ni/Co/Mn molar ratio on the structure, morphology and electrochemical properties of the as-prepared material were intensively investigated through X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge tests. The Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ sample had good crystallity, uniform distribution of particle size and excellent electrochemical performance. It delivered the largest initial discharge capacity (247.9 mA·h·g^-1) and coulombic efficiency (75.1%) at 0.1C-rate. Furthermore, it showed a high discharge capacity of 236.2 mA·h·g^-1 at 1C-rate and a capacity retention of 88.3% after 50 cycles.

Key words: Li-rich, Ni/Co/Mn molar ratio, cathode material, lithium ion battery, electronic materials, electrochemistry, preparation

摘要：

以NaOH和NH₃·H₂O为沉淀剂，采用共沉淀法成功合成富锂锰基层状正极材料。通过X射线粉末衍射（XRD）、拉曼光谱、扫描电子显微镜（SEM）、循环伏安法（CV）、电化学阻抗谱（EIS）和充放电测试等研究手段，重点探讨了不同镍钴锰比对富锂锰基层状正极材料的结构、形貌以及电化学性能的影响。其中Li_1.2Mn_0.54Ni_0.13Co_0.13O₂正极材料结晶度高，粒度分布均匀，无明显团聚现象。在0.1C倍率下首次放电比容量为247.9 mA·h·g^-1，首次库仑效率为75.1%。在1C倍率下首次放电比容量为236.2 mA·h·g^-1，经过50次充放电循环后放电比容量为218.4 mA·h·g^-1，容量保持率为88.3%，展现出较好的循环稳定性。

关键词: 富锂, 镍钴锰比, 正极材料, 锂离子电池, 电子材料, 电化学, 制备

CLC Number:

TM912.9

PENG Jiming, CHEN Yuhua, LIU Shicheng, HU Sijiang, WANG Hongqiang, LI Qingyu. Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi₂MnO₃-(1-x)LiMO₂ cathode material[J]. CIESC Journal, 2016, 67(7): 2950-2955.

彭继明, 陈玉华, 刘世成, 胡思江, 王红强, 李庆余. 不同镍钴锰比对xLi₂MnO₃-(1-x)LiMO₂正极材料的结构和电化学性能的影响[J]. 化工学报, 2016, 67(7): 2950-2955.

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Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi₂MnO₃-(1-x)LiMO₂ cathode material

不同镍钴锰比对xLi₂MnO₃-(1-x)LiMO₂正极材料的结构和电化学性能的影响

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