Mechanism of Capacity Fading Caused by Mn(Ⅱ)Deposition on Anodes for Spinel Lithium Manganese Oxide Cell

作     者：陈海辉 MA Tianyi ZENG Yingying GUO Xiuyan 邱新平 

作者机构：College of Chemistry&Chemical EngineeringJinggangshan UniversityJi'An 343009China Department of ChemistryTsinghua UniversityBeijing 100008China School of Mechanical&Electrical EngineeringJinggangshan UniversityJi'an 343009China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2017年第32卷第1期

页      面：1-10页

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：Funded by the National Natural Science Foundation of China(Nos.21561016,21661015) Jiangxi Provincial Science&Technology Program(Nos.20133BBE50010,20142BDH80020,and 20161BBE50052) Science&Technology Program of Jiangxi Provincial Education Bureau(No.GJJ150775) 

主　　题：capacity fade manganese deposition lithium manganese oxide core-shell structure 

摘      要：The capacity fade of spinel lithium manganese oxide in lithium-ion batteries is a bottleneck challenge for the large-scale *** traditional opinion is that Mn（Ⅱ） ions in the anode are reduced to the metallic manganese that helps for catalyzing electrolyte *** could poison and damage the solid electrolyte interface（SEI） film,leading to the the capacity fade in Li-ion *** propose a new mechanism that Mn（Ⅱ） deposites at the anode hinders and/or blocks the intercalation/de-intercalation of lithium ions,which leads to the capacity fade in Li-ion *** on the new mechanism assumption,a kind of new structure with core-shell characteristic is designed to inhabit manganese ion dissolution,thus improving electrochemical cycle performance of the *** the way,this mechanism hypothesis is also supported by the results of these *** LiMn2-xTixO4 shell layer enhances cathode resistance to corrosion attack and effectively suppresses dissolution of Mn,then improves battery cycle performance with LiMn_2O_4 cathode,even at high rate and elevated temperature.