Revealing performance of 78Li_(2)S-22P_(2)S_(5) glass ceramic based solid-state batteries at different operating temperatures  

作　　者：Chaochao Wei Xinrong Liu Chuang Yu Shaoqing Chen Shuai Chen Shijie Cheng Jia Xie 

机构地区：[1]State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [3]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Chinese Chemical Letters》2023年第7期418-422,共5页中国化学快报（英文版）

基　　金：supported by the National Key Research and Development Program (No. 2021YFB2400300);the National Natural Science Foundation of China (No. 52177214)。

摘　　要：78Li_(2)S-22P_(2)S_(5) are sulfide electrolytes with high lithium-ion conductivity and wide electrochemical windows in the Li_(2)S-P_(2)S_(5) system,making them attractive solid electrolytes for ASSLBs.However,the role and potential of 78Li_(2)S-22P_(2)S_(5) solid electrolytes over a wide temperature range are still not fully understood.Therefore,we constructed solid-state batteries with NCM622 as the positive electrode and 78Li_(2)S-22P_(2)S_(5) glass-ceramics as the electrolyte to investigate in depth the differences in battery performance over a wide temperature range and their intrinsic mechanisms.The in-situ impedance and relaxation time distribution (DRT) demonstrated the electrochemical stability of the electrolyte over a wide temperature range,while the in-situ stacking pressure observed a large volume change during cycling at 60℃,leading to local solid-solid contact failure and poor cycling stability.This study provides insight into the advantages and problems of 78Li_(2)S-22P_(2)S_(5) in the wide temperature range as well as a basis for the construction of ASSLBs with high energy density and long cycle life.

关 键 词：78Li_(2)S-22P_(2)S_(5)electrolytes Li-ion conductivity Operating temperature Battery performance Volume changes Interfacial resistance 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]