In Situ Partial-Cyclized Polymerized Acrylonitrile-Coated NCM811 Cathode for High-Temperature≥100℃ Stable Solid-State Lithium Metal Batteries  

作　　者：Jiayi Zheng Haolong Jiang Xieyu Xu Jie Zhao Xia Ma Weiwei Sun Shuangke Liu Wei Xie Yufang Chen ShiZhao Xiong Hui Wang Kai Xie Yu Han Maoyi Yi Chunman Zheng Qingpeng Guo 

机构地区：[1]College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,People’s Republic of China [2]Changsha New Energy Innovation Institute,Changsha 410083,People’s Republic of China [3]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,People’s Republic of China [4]Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第8期399-415,共17页纳微快报(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22102212 and 22479067).

摘　　要：High-nickel ternary cathodes hold a great application prospect in solid-state lithium metal batteries to achieve high-energy density,but they still suffer from structural instability and detrimental side reactions with the solid-state electrolytes.To circumvent these issues,a continuous uniform layer polyacrylonitrile(PAN)was introduced on the surface of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2) via in situ polymerization of acrylonitrile(AN).Furthermore,the partial-cyclized treatment of PAN(cPAN)coating layer presents high ionic and electron conductivity,which can accelerate interfacial Li+and electron diffusion simultaneously.And the thermodynamically stabilized cPAN coating layer cannot only effectively inhibit detrimental side reactions between cathode and solid-state electrolytes but also provide a homogeneous stress to simultaneously address the problems of bulk structural degradation,which contributes to the exceptional mechanical and electrochemical stabilities of the modified electrode.Besides,the coordination bond interaction between the cPAN and NCM811 can suppress the migration of Ni to elevate the stability of the crystal structure.Benefited from these,the In-cPAN-260@NCM811 shows excellent cycling performance with a retention of 86.8%after 300 cycles and superior rate capability.And endow the solid-state battery with thermal safety stability even at hightemperature extreme environment.This facile and scalable surface engineering represents significant progress in developing high-performance solid-state lithium metal batteries.

关 键 词：Solid-state lithium metal battery Ni-rich cathode Interface engineering In situ partial-cyclized PAN High-temperature resistance 

分 类 号：TM912[电气工程—电力电子与电力传动]