Rearrangement on surface structures by boride to enhanced cycle stability for LiNi0.80Co0.15Al0.05O2 cathode in lithium ion batteries  

作　　者：Shubiao Xia Wenjin Huang Xiang Shen Jiaming Liu Feixiang Cheng Jian-Jun Liu Xiaofei Yang Hong Guo 

机构地区：[1]Center for Yunnan-Guizhou Plateau Chemical Functional Materials and Pollution Control,Qujing Normal University,Qujing 655011,Yunnan,China [2]School of Materials Science and Engineering,Yunnan University,Kunming 650091,Yunnan,China [3]School of Metallurgy Engineering,Jiangxi University of Science and Technology,Ganzhou 341003,Jiangxi,China [4]Department of Mechanical and Materials Engineering,University of Western Ontario,London,N6A 5B9,Ontario,Canada

出　　处：《Journal of Energy Chemistry》2020年第6期110-118,I0005,共10页能源化学（英文版）

基　　金：the National Natural Science Foundation of China(51764048,51703118 and 51474191);Yunnan Province Thousand Youth Talents Plan;the Application Basis Research Project of Yunnan Province Science and Technology Department(2017FD144);Key Natural Science Foundation of Yunnan Province China(2018FA28)for providing the financial support。

摘　　要：The side reaction between the active material and liquid-electrolyte cause structural damage and particle pulverization is one of the important factors leading to the capacity decay of LiNi0.80Co0.15Al0.05O2(NCA)materials in Li ion batteries(LIBs).Surface modification is an effective strategy for NCA cathodes,which could alleviate the degradation associated with surface processes.Herein,a surface structure rearrangement of NCA cathode secondary particles was reported by in-situ forming a solid electrolyte LiBO2.The LiBO2 is beneficial for alleviating the stress during charge/discharge process,thereby slowing down the rate of cracks formation in the secondary particles,which facilitates the Li+de-intercalation as well as prevents penetration of the liquid-electrolyte into the interior of the particles.As a result,the surface structure rearrangement NCA(RS-NCA)delivers a high discharge capacity of 202.5 m Ah g^-1 at 0.1 C,and exhibits excellent cycle stability with discharge capacity retaining 148 m Ah g^-1 after 200 cycles at 2 C.This surface structure rearrangement approach provides a new viewpoint in designing high-performance high-voltage LIBs.

关 键 词：LiNi0.80Co0.15Al0.05O2 Surface structure REARRANGEMENT Particle PULVERIZATION Crack Cycle stability 

分 类 号：TM912[电气工程—电力电子与电力传动]