Improving Interfacial Electrochemistry of LiNi0.5Mn1.5O4 Cathode Coated by Mn3O4  

Mn3O4包覆对LiNi0.5Mn1.5O4正极材料界面电化学性能的提高

作　　者：Miao-miao Deng Da-wei Zhang Yu Shao Xiao-dong He Aqsa Yasmin Chun-hua Chen 邓苗苗;张大伟;邵宇;贺晓东;Aqsa Yasmin;陈春华(合肥工业大学化学与化工学院,合肥230009;中国科学技术大学化学与材料科学学院,合肥230026)

机构地区：[1]School of Chemistry and Chemical Engineering,Heifei University of Technology,Hefei 230009,China [2]Chinese Academy of Science Key Laboratory of Materials for Energy Conversions,Department of Materials Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2020年第4期485-490,I0002,共7页化学物理学报（英文）

基　　金：the National Key R&D Program of China(No.2018YFB0905400);the Fundamental Research Funds for the Central Universities(No.JZ2019HGBZ0140);the National Natural Science Foundation of China(No.U1630106;No.51577175);China Postdoctoral Science Foundation(No.172731)。

摘　　要：In this work the surface of LiNi0.5Mn1.5O4(LMN)particles is modified by Mn3O4 coating through a simple wet grinding method,the electronic conductivity is significantly improved from 1.53×10^-7 S/cm to 3.15×10^-5 S/cm after 2.6 wt%Mn3O4 coating.The electrochemical test results indicate that Mn3O4 coating dramatically enhances both rate performance and cycling capability(at 55℃)of LNM.Among the samples,2.6 wt%Mn3O4-coated LNM not only exhibits excellent rate capability(a large capacity of 108 m Ah/g at 10 C rate)but also shows 78%capacity retention at 55 ℃ and 1 C rate after 100 cycles.

关 键 词：Lithium-ion batteries Cathode materials Spinel lithium nickel manganese oxide Surface modification Cathode-electrolyte interphase 

分 类 号：TM912[电气工程—电力电子与电力传动] TB30[一般工业技术—材料科学与工程]