Citation: Hao-Tian DENG, Chuan-Wei WANG, Shou-Xiao CHEN, Si-Yu PAN, Chao LÜ, Ming-Jia GUO, Jun-Ke LIU, Guo-Zhen WEI, Yao ZHOU, Jun-Tao LI. Boosting the Electrochemical Performance of High-Voltage LiCoO₂ Cathode by a Dual-Coating Strategy[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(8): 1557-1566. doi: 10.11862/CJIC.2022.156 shu

Boosting the Electrochemical Performance of High-Voltage LiCoO₂ Cathode by a Dual-Coating Strategy

1.
College of Energy, Xiamen University, Xiamen, Fujian 361102, China
2.
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China
3.
XTC New Energy Materials (Xiamen) Co., Ltd., Xiamen, Fujian 361026, China

Corresponding author: Jun-Tao LI, jtli@xmu.edu.cn
Received Date: 31 March 2022
Revised Date: 10 June 2022

Figures(6)

In this study, by using the solid and liquid coating method, LiCoO₂ was dual-coated by lithium titanate (Li₄Ti₅O₁₂) and polypyrrole (PPy). The coating layers not only protect the surface of LiCoO₂ at high voltage but also increase its ion conductivity and electronic conductivity. According to the result of the electrochemistry test, when the mass ratio of active material, conductive agent, and binder was 80∶10∶10, the capacity retention of the modified material after 300 cycles at 0.5C (1C=180 mA·g^-1) was 76.9%. Its reversible capacity was 150 mAh·g^-1 at 5C cur- rent density. Due to the improvement of electric conductive of dual-coated LiCoO₂, when this mass ratio was 90∶3∶ 7, the capacity retention after 200 cycles at 0.5C was 82.8%. Its reversible capacity was 130 mAh·g^-1 at 5C current density. As shown in X-ray photoelectron spectra, the coating layers can keep stability during cycling and prevent side reactions on the surface.
- lithium cobalt oxide,
- lithium titanate,
- polypyrrole,
- dual-coating,
- high energy density
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Boosting the Electrochemical Performance of High-Voltage LiCoO₂ Cathode by a Dual-Coating Strategy