A lithium–tin fluoride anode enabled by ionic/electronic conductive paths for garnet-based solid-state lithium metal batteries  

作　　者：Lei Zhang Qian-Kun Meng Xiang-Ping Feng Ming Shen Yu-Qing Zhang Quan-Chao Zhuang Run-Guo Zheng Zhi-Yuan Wang Yan-Hua Cui Hong-Yu Sun Yan-Guo Liu 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China [2]School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao,066004,China [3]School of Materials and Physics,China University of Mining&Technology,Xuzhou,221116,China [4]Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang,621900,China

出　　处：《Rare Metals》2024年第2期575-587,共13页稀有金属（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(Nos.52177208,52171202,51971055 and 51871046);the National Safety Academic Fund(Nos.U1930208,U2030206 and U1730136).

摘　　要：The high energy density and stability of solid-state lithium metal batteries(SSLMBs)have garnered great attention.Garnet-type oxides,especially Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO),with high ionic conductivity,wide electrochemical window,and stability to Li metal anode,are promising solid-state electrolyte(SSEs)materials for SSLMBs.However,Li/LLZTO interface issues including high interface resistance,inhomogeneous Li deposition,and Li dendrite growth have hindered the practical application of SSLMBs.Herein,a multi-functional Li–SnF_(2) composite anode with Li,LiF,and Li-Sn alloy was specifically designed and prepared.The composite anode improves the wettability to LLZTO,constructing an intimate contact interface between it and LLZTO.Meanwhile,ionic/electronic conductive paths in situ formed at the interface can effectively uniform Li deposition and suppress Li dendrite.The solid-state symmetric cell exhibits low interface resistance(11Ω·cm^(2)) and high critical current density(1.3 mA·cm^(−2))at 25℃.The full SSLMB based on LiFePO_(4) or LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode also shows stable cycling performance and high rate capability.This work provides a new composite anode strategy for achieving high-energy density and high-safety SSLMBs.

关 键 词：Solid-state lithium metal batteries(SSLMBs) Lithium-tin fluoride anode Ionic/electronic conductive Interface resistance Lithium dendrite 

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]