Lithium-site substituted argyrodite-type Li_(6)PS_(5)I solid electrolytes with enhanced ionic conduction for all-solid-state batteries

作     者：GAO Ling XIE YuLin TONG Yan XU Miao YOU JiaLe WEI HuiPing YU XiangXiang XU SiQi ZHANG Yi CHE Yong TANG Ya SUZUKI Kota KANNO Ryoji ZHAO GuoWei GAO Ling;XIE YuLin;TONG Yan;XU Miao;YOU JiaLe;WEI HuiPing;YU XiangXiang;XU SiQi;ZHANG Yi;CHE Yong;TANG Ya;SUZUKI Kota;KANNO Ryoji;ZHAO GuoWei

作者机构：College of Chemistry and Chemical EngineeringHuanggang Normal UniversityHuanggang 438000China State Key Laboratory of Space Power-Sources TechnologyShanghai Institute of Space Power-SourcesShanghai 200245China Shanghai Enpower Technology Co.Ltd.Shanghai 201802China Beijing Enpower Technology Co.Ltd.Beijing 102628China Department of ChemistrySchool of ScienceShanghai UniversityShanghai 200444China Research Center for All-Solid-State BatteryInstitute of Innovation ResearchTokyo Institute of TechnologyYokohama 226-8502Japan 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2023年第66卷第7期

页      面：2059-2068页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the Hundred-Talent Project of Hubei Province,China(Grant No.2021HG01) the Huanggang Young Talent China(Grant No.HRZF2022-5) the Pearl Scholars Research Programs(Grant Nos.P20190218,P20190219) Young Scholars Start-up Research Programs of Huanggang Normal University,China(Grant Nos.Y20190218,Y20190219) 

主　　题：argyrodite Li6PS5I solid electrolytes ionic conductor ionic conductivity 

摘      要：Argyrodites,Li_(6)PS_(5)X(X=Cl,Br,I),have piqued the interest of researchers by offering promising lithium ionic conductivity for their application in all-solid-state batteries(ASSBs).However,other than Li_(6)PS_(5)Cl(651Cl)and Li_(6)PS_(5)Br(651Br),Li_(6)PS_(5)I(651I)shows poor ionic conductivity(10^(-7)S cm^(-1)at 298 K).Herein,we present Al-doped 651I with I^(-)/S^(2-)site disordering to lower activation energy(Ea)and improve ionic *** formed argyrodite-type solid solutions with a composition of(Li_(6–3x)Al_(x))PS_(5)I in 0≤x≤0.10,and structural analysis revealed that Al^(3+)is located at Li ***,the Al-doped samples contained anion I^(-)/S^(2-)site disorders in the crystal structures and smaller lattice parameters than the non-doped *** spectroscopy measurements indicated that Al-doping reduced the ionic diffusion barrier,Ea,and increased the ionic conductivity to 10^(-5)S cm^(-1);the(Li5.7Al0.1)PS5I had the highest ionic conductivity in the studied system,at 2.6×10^(-5)S cm^(-1).In a lab-scale ASSB,with(Li_(5.7)Al_(0.1))PS_(5)I functioned as a solid electrolyte,demonstrating the characteristics of a pure ionic conductor with negligible electronic *** evaluated ionic conduction is due to decreased Li+content and I^(-)/S^(2-)disorder ***-site cation doping enables an in-depth understanding of the structure and provides an additional approach to designing betterperforming SEs in the argyrodite system.