Reasonable design a high-entropy garnet-type solid electrolyte for all-solid-state lithium batteries  

作　　者：Shiyu Yu Yandi Li Jiaxin Luo Daming Chen Liang Yang Yaqing Wei De Li Yuanxun Li Yong Chen 

机构地区：[1]State Key Laboratory of Marine Resource Utilization in South China Sea,School of Materials Science and Engineering,Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources,Hainan University,Haikou 570228,Hainan,China [2]State Key Laboratory of Electronic Thin Films1nd Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan,China [3]Guangdong Key Laboratory for Hydrogen Energy Technologies,School of Materials Science and Hydrogen Energy,Foshan University,Foshan 528000,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第9期414-423,共10页能源化学（英文版）

基　　金：supported by the Natural Science Foundation of China(61901142);the Key Research and Development Project of Hainan Province(ZDYF2022SHFZ093).

摘　　要：Traditional garnet solid electrolyte(Li_(7)La_(3)Zr_(2)O_(12))suffers from low room temperature ionic conductivity,poor air stability,high sintering temperature and energy consumption.Considering the development prospects of high-entropy materials with high structural disorder and strong component controllability in the field of electrochemical energy storage,herein,a novel high-entropy garnet-type oxide solid electrolyte,Li_(5.75)Ga_(0.25)La_(3)Zr_(0.5)Ti_(0.5)Sn_(0.5)Nb_(0.5)O_(12)(LGLZTSNO)was constructed by partially replacing the Li and Zr sites in Li_(7)La_(3)Zr_(2)O_(12)with Ga and Ti/Sn/Nb elements,respectively.The experimental and density functional theory(DFT)calculation results show that the high-entropy LGLZTSNO electrolyte has preferable room temperature ion conductivity,air stability,interface contact performance with lithium anode,and the ability to suppress lithium dendrites.Thanks to the improvement of electrolyte performance,the critical current density of Li/Ag@LGLZTSNO/Li symmetric cell was increased from 0.42 to 1.57 mA cm^(−2),and the interface area specific impedance(IASR)was reduced from 765.2 to 42.3Ωcm^(2).Meanwhile,the Li/Ag@LGLZTSNO/LFP full cell also exhibits excellent rate performance and cycling performance(148 mA h g^(−1)at 0.1 C and 124 mA h g^(−1)at 0.5 C,capacity retention up to 84.8%after 100 cycles at 0.1 C),showing the application prospects of high-entropy LGLZTSNO solid electrolyte in high-performance all solid state lithium batteries.

关 键 词：Garnet solid electrolyte Dual-site substitution High-entropy all solid-state lithium batteries(ASSLBs) 

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