Introducing electrolytic electrochemical polymerization for constructing protective layers on Ni-rich cathodes of Li-ion batteries  

作　　者：Lin-Tao Dou Bei Li Hao-Long Nie Dong-Dong Xiao Chao-Qun Shang Xiao-Min Wang Zhan-Hui Zhang Katerina E.Aifantis Pu Hu 

机构地区：[1]School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China [2]Huairou Division,Institute of Physics,Chinese Academy of Sciences,Beijing 101400,China [3]Department of Mechanical and Aerospace Engineering,University of Florida,Gainesville,FL 32603,USA

出　　处：《Rare Metals》2024年第6期2536-2545,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52172227 and Z190010)。

摘　　要：LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is the most promising cathode for high-energy Li-ion batteries,despite its poor cycling stability that originates from the reactions that occur with the electrolyte.Herein,to solve this interfacial issue,a facile electrolytic electrochemical polymerization process was introduced in this paper,and a uniform conductive electrolyte interface(polyaniline)was successfully constructed on the surface of the NCM811 porous electrode(PANI-NCM),which facilitated the charge transfer during charge/discharge.The side reactions at the interface between the cathode and the electrolyte are suppressed,and thereby,the cycling performance and rate capability are considerably improved.PANI-NCM delivers an initial capacity of 157.2 mAh·g^(-1)as well as excellent cyclability(capacity retention of 88%after 500 cycles at 2C),whereas the capacity of the bare NCM811 has dropped to 31.3 mAh·g^(-1).In addition,polypyrrole and polythiophene also can be formed through electrolytic electrochemical polymerization process,which provides a practicable tactic to modify the interfacial stability of cathodes for high-energy Li-ion batteries.

关 键 词：Lithium-ion battery Ni-rich cathode In-situ polymerization Conductive polymer Electrochemical performance 

分 类 号：O646[理学—物理化学] TM912[理学—化学]