Insights Into the Interfacial Degradation of High-Voltage All-Solid-State Lithium Batteries

作     者：Jiawen Li Yuchen Ji Haoran Song Shiming Chen Shouxiang Ding Bingkai Zhang Luyi Yang Yongli Song Feng Pan Jiawen Li;Yuchen Ji;Haoran Song;Shiming Chen;Shouxiang Ding;Bingkai Zhang;Luyi Yang;Yongli Song;Feng Pan

作者机构：School of Advanced MaterialPeking University Shenzhen Graduate SchoolShenzhen 518055People’s Republic of China Guangzhou Key Laboratory of Clean Transportation Energy ChemistrySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 51006People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2022年第14卷第12期

页      面：1-13页

核心收录：

学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：We acknowledge financial support from The Shenzhen Science and Technology Research Grant(No.JCYJ20200109140416788) Soft Science Research Project of Guangdong Province(No.2017B030301013) The National Natural Science Foundation of China(No.52102200) 

主　　题：Solid-state battery Poly(ethylene oxide) Surface modification Interface stability High-voltage cathode 

摘      要：Poly(ethylene oxide)(PEO)-based solid polymer electrolyte(SPE)is considered as a promising solid-state electrolyte for all-solid-state lithium batteries(ASSLBs).Nevertheless,the poor interfacial stability with high-voltage cathode materials(e.g.,LiCoO_(2))restricts its application in high energy density solid-state ***,high-voltage stable Li_(3)AlF_(6) protective layer is coated on the surface of LiCoO_(2) particle to improve the performance and investigate the failure mechanism of PEO-based *** phase transition unveils that chemical redox reaction occurs between the highly reactive LiCoO_(2) surface and PEO-based SPE,resulting in structure collapse of LiCoO_(2),hence the poor cycle performance of PEO-based ASSLBs with LiCoO_(2) at charging voltage of 4.2 V vs Li/Li+.By sharp contrast,no obvious structure change can be found at the surface of Li_(3)AlF_(6)-coated LiCoO_(2),and the original layered phase was well *** the charging voltage reaches up to 4.5 V vs Li/Li+,the intensive electrochemical decomposition of PEO-based SPE occurs,leading to the constant increase of cell impedance and directly causing the poor *** work not only provides important supplement to the failure mechanism of PEO-based batter-ies with LiCoO_(2),but also presents a universal strategy to retain structure stability of cathode-electrolyte interface in high-voltage ASSLBs.