首页|Interface and mechanical degradation mechanisms of the silicon anode in sulfide-based solid-state batteries at high temperatures

Interface and mechanical degradation mechanisms of the silicon anode in sulfide-based solid-state batteries at high temperatures

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Silicon(Si)is a competitive anode material owing to its high theoretical capacity and low electrochemical potential.Recently,the prospect of Si anodes in solid-state batteries(SSBs)has been proposed due to less solid electrolyte interphase(SEI)formation and particle pulverization.However,major challenges arise for Si anodes in SSBs at elevated temperatures.In this work,the failure mechanisms of Si-Li6PS5Cl(LPSC)composite anodes above 80 ℃ are thoroughly investigated from the perspectives of interface stability and(electro)chemo-mechanical effect.The chemistry and growth kinetics of LixSi|LPSC interphase are demonstrated by combining electrochemical,chemical and computational characterizations.Si and/or Si-P compound formed at LixSi|LPSC interface prove to be detrimental to interface stability at high temperatures.On the other hand,excessive volume expansion and local stress caused by Si lithiation at high temperatures damage the mechanical structure of Si-LPSC composite anodes.This work elucidates the behavior and failure mechanisms of Si-based anodes in SSBs at high temperatures and provides insights into upgrading Si-based anodes for application in SSBs.

sulfide electrolytessilicon anodesinterface stabilitydegradation kineticsall-solid-state batteries

王秋辰、黄昱力、许晶、禹习谦、李泓、陈立泉

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Key Laboratory for Renewable Energy,Beijing Key Laboratory for New Energy Materials and Devices,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

University of Chinese Academy of Sciences,Beijing 100049,China

Huairou Division,Institute of Physics,Chinese Academy of Sciences,Beijing 101408,China

Major Program of the National Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaBeijing Municipal Science & Technology CommissionNew Energy Vehicle Power Battery Life Cycle Testing and Verification Public Service Platform Project

223939042022YFB2502200Z2211000067220152022-235-224

2024

10.1088/1674-1056/ad5276

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)