Revealing the influence of in-situ formed LiCl on garnet/Li interface for dendrite-free solid-state batteries

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外文摘要：Inadequate interfacial contact between lithium and solid-state electrolytes(SSEs)leads to elevated impe-dance and the growth of lithium dendrites,presenting significant obstacles to the practical viability of solid-state batteries(SSBs).To ameliorate interfacial contact,optimizing the surface treatment of SSEs has been widely adopted.However,the formation of LiCl through acid treatment,an equally crucial factor impacting SSB performance,has received limited attention,leaving its underlying mechanism unclear.Our study aims to shed light on SSE characteristics following LiCl formation and the removal of Li2CO3 through acid treatment.We seek to establish quantifiable links between SSE surface structure and SSB performance,focusing on interfacial resistance,current distribution,critical current density(CCD),and lithium deposition.The formation of LiCl,occurring as Li2CO3 is removed through acid treatment,effec-tively mitigates lithium dendrite formation on SSE surfaces.This action inhibits electron injection and reduces the diffusion rate of Li atoms.Simultaneously,acid treatment transforms the SSE surface into a lithiophilic state by eliminating surface Li2CO3.Consequently,the interfacial resistance between lithium and SSEs substantially decreases from 487.67 to 35.99 Ω cm2 at 25 ℃.This leads to a notably high CCD of 1.3 mA cm-2 and a significantly extended cycle life of 1,000 h.Furthermore,in full SSBs incorporating LiCoO2 cathodes and acid-treated garnet SSEs,we observe exceptional cyclability and rate capability.Our findings highlight that acid treatment not only establishes a fundamental relationship between SSE surfaces and battery performance but also offers an effective strategy for addressing interfacial chal-lenges in SSBs.

外文关键词：

Solid-state batteriesAcid treatmentInterfacial stabilityLiClSurface modification

作者：

Seoyoon Shin、Jinuk Lee、Tae Ho Shin、Seokhee Lee

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作者单位：

Hydrogen Energy Materials Center,Korea Institute of Ceramic Engineering & Technology,Jinju-si,Gyeongsangnam-do 52851,Republic of Korea

Department of Materials Science and Engineering,Yonsei University,Seoul 03722,Republic of Korea

基金：

National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)Fundamental R&D program through the Korea Institute of Ceramic Engineering & Technology(KICET)Fundamental R&D program through the Korea Institute of Ceramic Engineering & Technology(KICET)

项目编号：

2021R1F1A10630931415187241KPB23003

出版年：

2024

DOI：

10.1016/j.jechem.2023.12.020

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.92(5)