Co-doping strategy enhanced the ionic conductivity and excellent lithium stability of garnet-type Li_(7)La_(3)Zr_(2)O_(12)electrolyte in all solidstate lithium batteries  

作　　者：Ziqiang Xu Xin Hu Bowen Fu Kashif Khan Jintian Wu Teng Li Haiping Zhou Zixuan Fang Mengqiang Wu 

机构地区：[1]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu,611731,Sichuan,China [2]Yangtze Delta Region Institute(HuZhou),University of Electronic Science and Technology of China,Huzhou,313001,Zhejiang,China [3]School of Chemical Engineering,Sichuan University of Science&Engineering,Zigong,643000,China

出　　处：《Journal of Materiomics》2023年第4期651-660,共10页无机材料学学报（英文）

基　　金：the National Natural Science Foundation of China(Grant No.52102123);Natural Science Foundation of Sichuan Province(Grant No.2022NSFSC2008,and Grant No.2023NSFSC0442);the China Postdoctoral Science Foundation(2022M710619).

摘　　要：Garnet-type Li_(7)La_(3)Zr_(2)O_(12)(LLZO)is one of the most promising solid-state electrolytes(SSEs).However,the application of LLZO is limited by structural instability,low ionic conductivity,and poor lithium stability.To obtain a garnet-type solid electrolyte with a stable structure and high ionic conductivity,a series of TaeCe co-doping cubic Li_(6.4)La_(3)Zr_(1.4-x)Ta_(0.6)Ce_(x)O_(12)(LLZTCO,x=,0.02,0.04,0.06,0.08,0.10,0.20,0.30)electrolytes were successfully synthesized through conventional solid-phase method.The Ta^(5+)doping can introduce more lithium vacancies and effectively maintain the stability of the cubic phase.The Ce^(4+)with a larger ionic radius is introduced into the lattice to widen the Lit migration bottleneck size,which significantly increased the ionic conductivity to 1.05×10^(-3)S/cm.It also shows excellent stability to lithium metal by the optimization of Lit transport channel.Li||LLZTCO||Li symmetric cells can cycle stably for more than 6000 h at a current density of 0.1 mA/cm^(2)without any surface modifications.The commercialization potential of LLZTCO samples in all solid-state lithium batteries(ASSLBs)is confirmed by the prepared LiFePO_(4)||LLZTCO||Li cells with a capacity retention rate of 98%after 100 cycles at 0.5C.This new co-doping method presents a practical solution for the realization of high-performance ASSLBs.

关 键 词：Solid-state electrolytes Garnet-type CO-DOPING Bottleneck size Ionic conductivity Lithium stability 

分 类 号：TM912[电气工程—电力电子与电力传动]