Electrochemical characterization of AlPO4 coated LiNi1/3Co1/3 Mn1/3O2 cathode materials for high temperature lithium battery application

• 作者: Jian-Hua Wang Yu Wang Yu-Zhong Guo Chang-Wei Liu Lu-Lu Dan
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 78-83
• 页数: 6页
• 语种: 英文

摘要

Aluminum phosphate(AlPO4)was used to modify the surface of LiNi1/3Co1/3Mn1/3O2(NCM)cathode material.The surface structure and electrochemical prop-erties of the coated materials were investigated by X-ray photoelectron spectroscopy(XPS)and electrochemical impedance spectroscopy(EIS).The results confirm the formation of aluminum-containing solid solution on the surface of NCM particles.An aluminum phosphate coating blocks the Li+insertion-extraction process in cells charged at high rates at room temperature,increasing surface film resistance and decreasing discharge capacity.However,an aluminum phosphate aids the formation of a stable solid electrolyte interface film on NCM surface and stabilizes the Rct of cell as samples electrochemically cycled at 55℃.The electrochemical studies suggest that the initial columbic efficiency is significantly enhanced.An NCM sample coated with 1.0 wt％AlPO4 delivers a higher discharge capacity and shows excellent capacity retention ability.