Abstract
The high energy density and stability of solid-state lithium metal batteries(SSLMBs)have garnered great attention.Garnet-type oxides,especially Li6.4La3Zr1.4-Ta0.6O12(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 appli-cation of SSLMBs.Herein,a multi-functional Li-SnF2 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.Mean-while,ionic/electronic conductive paths in situ formed at the interface can effectively uniform Li deposition and suppress Li dendrite.The solid-state symmetric cell exhi-bits low interface resistance(11 Ω·cm2)and high critical current density(1.3 mA·cm-2)at 25 ℃.The full SSLMB based on LiFePO4 or LiNi0.5Co0.2Mn0.3O2 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.
基金项目
国家自然科学基金(52177208)
国家自然科学基金(52171202)
国家自然科学基金(51971055)
国家自然科学基金(51871046)
National Safety Academic Fund(U1930208)
National Safety Academic Fund(U2030206)
National Safety Academic Fund(U1730136)
NETL
NSTL
万方数据