Defect chemistry engineering of Ga-doped garnet electrolyte with high stability for solid-state lithium metal batteries

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外文摘要：Ga-doped Li7La3Zr2O12(Ga-LLZO)has long been considered as a promising garnet-type electrolyte candidate for all-solid-state lithium metal batteries(ASSLBs)due to its high room temperature ionic conductivity.However,the typical synthesis of Ga-LLZO is usually accompanied by the formation of undesired LiGaO2 impurity phase that causes severe instability of the electrolyte in contact with molten Li metal during half/full cell assembly.In this study,we show that by simply engineering the defect chemistry of Ga-LLZO,namely,the lithium deficiency level,LiGaO2 impurity phase is effectively inhibited in the final synthetic product.Consequently,defect chemistry engineered Ga-LLZO exhibits excellent electrochemical stability against lithium metal,while its high room temperature ionic conductivity(～1.9 × 10-3 S·cm-1)is well reserved.The assembled Li/Ga-LLZO/Li symmetric cell has a superior critical current density of 0.9 mA·cm-2,and cycles stably for 500 hours at a current density of 0.3 mA·cm-2.This research facilitates the potential commercial applications of high performance Ga-LLZO solid electrolytes in ASSLBs.

外文关键词：

Ga-doped Li7La3Zr2O12(Ga-LLZO)defect chemistry engineeringhigh room temperature ionic conductivityelectrochemical stability

作者：

陈思汗、黎俊、刘可可、孙笑晨、万京伟、翟慧宇、唐新峰、谭刚健

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作者单位：

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

International School of Materials Science & Engineering,Wuhan University of Technology,Wuhan 430070,China

基金：

National Natural Science Foundation of ChinaNational Key Research and Development Program of China

项目编号：

521712212019YFA0704900

出版年：

2024

DOI：

10.1088/1674-1056/ad41b9

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

年,卷(期)：2024.33(8)