Stabilizing surface chemistry and texture of single-crystal Ni-rich cathodes for Li-ion batteries  

作　　者：Zhaofeng Yang Ling Chen Huawei Zhu Yihua Zhu Hao Jiang Chunzhong Li 

机构地区：[1]Shanghai Engineering Research Center of Hierarchical Nanomaterials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Key Laboratory for Ultrafine Materials of Ministry of Education,Frontiers Science Center for Materiobiology and Dynamic Chemistry,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Journal of Materials Science & Technology》2022年第30期192-197,共6页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21838003,21978088,and 91834301);the Innovation Program of Shanghai Municipal Education Commission;the Fundamental Research Funds for the Central Universities(No.222201718002)。

摘　　要：The single-crystalline Ni-rich cathodes are believed to help improve the safety of Li-ion batteries(LIBs),however,the ion-diffusion limits their high-rate performance owing to large single-crystal particles.Herein,a dual-modification strategy of surface Li_(2)TiO_(3)-coating and bulk Ti-doping has been performed to achieve high-rate single crystal LiNi_(0.83)Co_(0.12)Mn_(0.05)O_(2)(NCM)cathode.The Li-ion conductive Li_(2)TiO_(3) coating layer facilitates the Li-ion transfer and prevents the electrolyte erosion.Meanwhile,the robust Ti-O bonds stabilize the cubic close-packed oxygen framework and mitigate the Li/Ni disorder.The synergy endows the dual-modified NCM with enhanced de-/lithiation reaction kinetics and stable surface chemistry.A high specific capacity of 128 mAh g^(-1) is delivered even at 10 C with an extended cycle life.This finding is reckoned to pave the way for developing high energy density LIBs for long-range electric vehicles.

关 键 词：NCM811 SINGLE-CRYSTAL Dual-modification Specific capacity Li-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]