Citation: WANG Xiao-Ya, CHENG Qian, HUANG Tao, YU Ai-Shui. Effect of Calcination Atmosphere on Li/Ni Disorder and Electrochemical Performance of Layered LiNi_0.5Mn_0.5O₂[J]. Acta Physico-Chimica Sinica, ;2011, 27(02): 437-442. doi: 10.3866/PKU.WHXB20110239 shu

Effect of Calcination Atmosphere on Li/Ni Disorder and Electrochemical Performance of Layered LiNi_0.5Mn_0.5O₂

1.
Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, P. R. China

Received Date: 23 October 2010
Available Online: 13 January 2011
Fund Project: 国家重点基础研究发展规划(973) (2009CB220100) (973) (2009CB220100) 国家高技术研究发展计划(863) (2009AA033701) (863) (2009AA033701)上海催化材料功能研究实验室(08DZ2270500)资助项目 (08DZ2270500)

Layered LiNi_0.5Mn_0.5O₂ was synthesized by a solid state reaction method under air or oxygen atmosphere. The obtained materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electrochemical impedance spectroscopy (EIS), and charge-discharge tests. The results show that the LiNi_0.5Mn_0.5O₂ synthesized by the solid state reaction method under both air and oxygen atmospheres give a pure phase and od crystallinity, however, their electrochemical performance differs. The material synthesized under oxygen gives better electrochemical performance including a higher first discharge capacity and better cycle stability. At a rate of 0.1C the first discharge capacity of the material synthesized under oxygen was found to be 178 mAh·g^-1. After 50 charge and discharge cycles the discharge capacity was still 165 mAh·g^-1 giving a capacity retention rate of 92.7%. For the material synthesized under air, the first discharge capacity at a rate of 0.1C was found to be 164 mAh·g^-1. After 50 charge and discharge cycles, the discharge capacity was 137 mAh·g^-1 giving a capacity retention rate of 83.5%. The reason for the material synthesized under oxygen having better electrochemical performance than the material synthesized under air is due to the oxygen atmosphere suppressing the Li/Ni exchange ratio in LiNi_0.5Mn_0.5O₂.
- Lithium ion battery,
- Cathode material, LiNi_0.5Mn_0.5O₂,
- Li/Ni exchange,
- Calcination atmosphere
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Calcination Atmosphere on Li/Ni Disorder and Electrochemical Performance of Layered LiNi0.5Mn0.5O2

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通讯作者: 陈斌, bchen63@163.com

Effect of Calcination Atmosphere on Li/Ni Disorder and Electrochemical Performance of Layered LiNi_0.5Mn_0.5O₂