Citation: BAN Li-Qing, BAI Xiang-Tao, ZHUANG Wei-Dong, LI Wen-Jin, HUANG Wei, LU Shi-Gang. Preparation of Long-Life Nickel-Rich and Cobalt-Free Layered LiNi_0.75Mn_0.25O₂ Cathode Materials[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(1): 79-86. doi: 10.11862/CJIC.2020.011 shu

Preparation of Long-Life Nickel-Rich and Cobalt-Free Layered LiNi_0.75Mn_0.25O₂ Cathode Materials

BAN Li-Qing ^1,2 ,
BAI Xiang-Tao ^1,2 ,
ZHUANG Wei-Dong ^1,2,, ,
LI Wen-Jin ^1,2 ,
HUANG Wei ^1,2 ,
LU Shi-Gang ^1,2

1.
General Research Institute for Nonferrous Metals, Beijing 100088, China
2.
China Automotive Battery Research Institute Co., Ltd., Beijing 101400, China

Corresponding author: ZHUANG Wei-Dong, wdzhuang@126.com
Received Date: 24 June 2019
Revised Date: 12 October 2019

Figures(6)

The nickel-rich and cobalt-free binary cathode materials were prepared, and the effects of lithium content, calcination temperature and coating modification on the properties of samples were studied. X-ray diffraction (XRD) analyses and electrochemical properties such as first charge-discharge performance, rate performance and cycling performance of different samples and modified materials were investigated. Among them, the material with excess lithium content of 5%(w/w) and calcination temperature of 820℃ had excellent performance. Its first discharge specific capacity was 171.6 mAh·g^-1, and the discharge specific capacities of 1C and 3C were 147.8 and 129.8 mAh·g^-1, respectively. After coating the material with 1.0%(w/w) manganese compound, the residual alkali content of the material decreased obviously. The processing performance was excellent, the rate performance was improved obviously, and the discharge specific capacities of 1C and 3C were increased to 156.5, 141.8 mAh·g^-1, respectively. The capacity retention rate of 2Ah soft-packed battery was 80% after 830 cycles at room temperature and 80% after 345 cycles at high temperature.
- lithium-ion batteries,
- cathode material,
- Ni-rich and Co-free,
- modification,
- cyclability
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Preparation of Long-Life Nickel-Rich and Cobalt-Free Layered LiNi0.75Mn0.25O2 Cathode Materials

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通讯作者: 陈斌, bchen63@163.com

Preparation of Long-Life Nickel-Rich and Cobalt-Free Layered LiNi_0.75Mn_0.25O₂ Cathode Materials