In-situ coating and surface partial protonation co-promoting performance of single-crystal nickel-rich cathode in all-solid-state batteries  

作　　者：Maoyi Yi Jie Li Mengran Wang Xinming Fan Bo Hong Zhian Zhang Aonan Wang Yanqing Lai 

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China [2]Engineering Research Centre of Advanced Battery Materials,The Ministry of Education,Changsha 410083,Hunan,China [3]Hunan Province Key Laboratory of Nonferrous Value-Added Metallurgy,Central South University,Changsha 410083,Hunan,China

出　　处：《Journal of Energy Chemistry》2024年第2期137-143,I0005,共8页能源化学（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Nos.52034011 and 52204328);the Science and Technology Innovation Program of Hunan Province(2023RC305);the Changsha Municipal Natural Science Foundation(kq2202085)。

摘　　要：The poor electrochemical performance of all-solid-state batteries(ASSBs),which is assemblied by Ni-rich cathode and poly(ethylene oxide)(PEO)-based electrolytes,can be attributed to unstable cathodic interface and poor crystal structure stability of Ni-rich cathode.Several coating strategies are previously employed to enhance the stability of the cathodic interface and crystal structure for Ni-rich cathode.However,these methods can hardly achieve simplicity and high efficiency simultaneously.In this work,polyacrylic acid(PAA)replaced traditional PVDF as a binder for cathode,which can achieve a uniform PAA-Li(LixPAA(0<x≤1))coating layer on the surface of single-crystal LiNi_(0.83)Co_(0.12)Mn_(0.05)O_(2)(SC-NCM83)due to H^(+)/Li^(+)exchange reaction during the initial charging-discharging process.The formation of PAA-Li coating layer on cathode can promote interfacial Li^(+)transport and enhance the stability of the cathodic interface.Furthermore,the partially-protonated surface of SC-NCM83 casued by H^(+)/Li^(+)exchange reaction can restrict Ni ions transport to enhance the crystal structure stability.The proposed SC-NCM83-PAA exhibits superior cycling performance with a retention of 92%compared with that(57.3%)of SC-NCM83-polyvinylidene difluoride(PVDF)after 200 cycles.This work provides a practical strategy to construct high-performance cathodes for ASSBs.

关 键 词：Single-crystal LiNi_(0.83)Co_(0.12)Mn_(0.05)O_(2) In-situ coating PAA-Li Partial protonation 

分 类 号：TM912[电气工程—电力电子与电力传动]