Surface cobaltization for boosted kinetics and excellent stability of nickel-rich layered cathodes  

作　　者：Qiusheng Zhang Chunyu Cui Hao Chen Shuaijun Pan Yinghe Zhang Jian Zhu Bingan Lu 

机构地区：[1]State Key Laboratory for Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan Key Laboratory of Two-Dimensional Materials,School of Physics and Electronics,Hunan University,Changsha 410082,China [2]School of Science,Harbin Institute of Technology,Shenzhen 518055,China [3]Shenzhen Research Institute,Hunan University,Changsha 518055,China

出　　处：《National Science Open》2024年第6期26-41,共16页国家科学进展（英文）

基　　金：supported by the National Natural Science Foundation of China(52074113,22005091 and 22005092);the Hunan University Outstanding Youth Science Foundation(531118040319);the Science and Technology Innovation Program of Hunan Province(2021RC3055);the Changsha Municipal Natural Science Foundation(kq2014037),the CITIC Metals Ningbo Energy Co.Ltd.(H202191380246);the Chongqing Talents:Exceptional Young Talents Project(CQYC202105015);the Shenzhen Virtual University Park Basic Research Project of Free Exploration(2021Szvup036);the National Key Research and Development Program of China(2022YFB2402400).

摘　　要：The feasibility of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2) as a primary cathode material has decreased due to the fragile cobalt(Co)supply chain and its undesirable effects on structural degradation.LiNi_(0.6)Mn_(0.4)O_(2) deserves greater attention because of its high thermal and cyclic stability,coupled with low raw material and production costs.However,this material suffers from low reversible capacity and poor rate performance.Herein,we rationally design a high-performance cathode structure composed of a robust conductive protective layer,gradient Li^(+)ions conductive layer and stable bulk phase of LiNi_(0.6)Mn_(0.4)O_(2) through surface cobaltization,which not only boosts the reaction kinetics of the electrode but also suppresses particle cracking and mitigates surface structural degradation.As a result,a dramatically improved rate capacity(118.7 vs 53.5 mAh g^(-1) at 5 C)and impressive capacity retention after 300 cycles(90.4% in a full cell)at a high cutoff voltage(4.4 V)are obtained.Co-modified Li-Ni_(0.6)Mn_(0.4)O_(2) is promising to challenge commercial position of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2) attributed to the accessible capacity,superior rate capacity,excellent cycle performance,good thermal stability and low cost.Our results open a door for optimizing the use of Co and the structural design of high-nickel cathodes.

关 键 词：lithium-ion battery nickel-rich layered cathodes low-/zero-cobalt surface reconstruction structure design 

分 类 号：TB34[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]