Vapor-assisted synthesis of Al2O3-coated LiCoO2 for high-voltage lithium ion batteries

Authors

Fei Zhao, Shanghai University
Yufeng Tang, Shanghai Institute of Ceramics China
Junsheng Wang, Anshan Iron and Steel CoFollow
Jianliya Tian, Shanghai University
Honghua Ge, Shanghai University
Baofeng Wang, University of WollongongFollow

RIS ID

101854

Publication Details

Zhao, F., Tang, Y., Wang, J., Tian, J., Ge, H. & Wang, B. (2015). Vapor-assisted synthesis of Al₂O₃-coated LiCoO₂ for high-voltage lithium ion batteries. Electrochimica Acta, 174 384-390.

Abstract

A simple and facile vapor-assisted hydrolysis route has been used to synthesize Al₂O₃-coated LiCoO₂. The effects of Al₂O₃ coating on the structure and electrochemical performance have been systematically studied. After deposition of the Al₂O₃ coating, the crystal structure and morphology of LiCoO₂ are maintained. Galvanostatic charge-discharge tests show that Al₂O₃-coated LiCoO₂ exhibits markedly improved capacity retention and rate capability at high charge voltage (4.5 V). The Al₂O₃-coated LiCoO₂ exhibits an initial discharge capacity of 165.5 mAh/g at 360 mA/g, and the capacity retention is 98.6% after 180 cycles. The electrochemical impedance spectroscopy results demonstrate that the Al₂O₃ coating can slow the increase of charge-transfer resistance during cycling, which is in accord with the excellent electrochemical cycling performance of Al₂O₃-coated LiCoO₂.