Excellent electrochemical compatibility of Li-rich glass-ceramic solid electrolyte enabling superior all-solid-state lithium batteries  

作　　者：Rajesh Rajagopal Yuvaraj Subramanian Yu Jin Jung Sung Kang Kwang-Sun Ryu 

机构地区：[1]Department of Chemistry,University of Ulsan,Doowang-dong,Nam-gu,Ulsan 44776,Korea [2]Energy Harvest Storage Research Center(EHSRC),University of Ulsan,Mugeo-dong,Nam-gu,Ulsan 44610,Korea [3]Research Center for Advanced Specialty Chemicals,Korea Research Institute of Chemical Technology(KRICT),Ulsan 44412,Korea [4]Research Institute of Industrial Science&Technology,San Hyoja-dong,Pohang 37673,Korea

出　　处：《Journal of Materials Science & Technology》2024年第24期8-16,共9页材料科学技术(英文版)

基　　金：supported by the National Research Foundation of Korea(NRF)grant(No.NRF-2019R1A6A1A11053838);funded by the Ministry of Education,Science and Technology(MEST)of the Korean Government.

摘　　要：Li_(2)S-P_(2)S_(5)-type inorganic solid electrolytes with cation and/or anion doping are considered to be promising candidates for all-solid-state batteries(ASSBs),due to their high ionic conductivity and electrochemical performances.However,compositional tuning of Li_(2)S-P_(2)S_(5) type inorganic solid electrolytes without doping has not been fully studied.In this work,Li-rich Li_(7)P_(2)S_(8)I solid electrolyte was prepared with compositional tuning by high energy ball mill process.The crystalline nature and the structural characteristics of the prepared solid electrolytes were studied with several physiochemical techniques.The effect of compositional tuning and the associated limitations were analyzed by laser Raman spectroscopy and solid-nuclear magnetic resonance spectroscopy(NMR)analysis techniques.The prepared Li-rich Li_(7)P_(2)S_(8)I solid electrolyte exhibited higher ionic conductivity(6.27 mS cm^(-1))than the bare Li_(7)P_(2)S_(8)I solid electrolyte(5.16 mS cm^(-1)).Further,the prepared Li_(7.1)P_(2)S_(8.1)I_(0.9) solid electrolyte is highly stable against lithium metal anode and is stable up to 600 charge-discharge cycles.Thus,the fabricated ASSB using Li-rich Li_(7)P_(2)S_(8)I solid electrolyte exhibited excellent cycle stability of 97% specific capacity retention with less interfacial reaction.Electrochemical impedance spectroscopy and the laser Raman spectroscopy analysis after galvanostatic charge-discharge cycling confirmed the electrochemical stability of Li-rich Li_(7)P_(2)S_(8)I solid electrolyte.

关 键 词：Solid electrolyte Li_(7)P_(2)S_(8)I Li-rich solid electrolyte Ionic conductivity High stability All-solid-state batteries 

分 类 号：TM9[电气工程—电力电子与电力传动]