Electrochemical characterization of AlPO_(4) coated LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2) cathode materials for high temperature lithium battery application  

作　　者：Jian-Hua Wang Yu Wang Yu-Zhong Guo Chang-Wei Liu Lu-Lu Dan 

机构地区：[1]Research Center for Analysis and Measure,Kunming University of Science and Technology,Kunming 650093,China [2]School of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《Rare Metals》2021年第1期78-83,共6页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.U1202272);University Project of Kunming University of Science and Technology(No.KKZ4200730010)。

摘　　要：Aluminum phosphate(AlPO_(4))was used to modify the surface of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(NCM)cathode material.The surface structure and electrochemical properties 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%AlPO_(4) delivers a higher discharge capacity and shows excellent capacity retention ability.

关 键 词：SURFACE Lithium battery ELECTROCHEMICAL 

分 类 号：TM912[电气工程—电力电子与电力传动] TB306[一般工业技术—材料科学与工程]