中国物理B ›› 2024, Vol. 33 ›› Issue (8): 88201-088201.doi: 10.1088/1674-1056/ad5276
Interface and mechanical degradation mechanisms of the silicon anode in sulfide-based solid-state batteries at high temperatures
Qiuchen Wang(王秋辰)1,2, Yuli Huang(黄昱力)1,2, Jing Xu(许晶)1,2, Xiqian Yu(禹习谦)1,2,3,†, Hong Li(李泓)1,2,3,‡, and Liquan Chen(陈立泉)1,2,3
- 1 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;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Huairou Division, Institute of Physics, Chinese Academy of Sciences, Beijing 101408, China
Interface and mechanical degradation mechanisms of the silicon anode in sulfide-based solid-state batteries at high temperatures
Qiuchen Wang(王秋辰)1,2, Yuli Huang(黄昱力)1,2, Jing Xu(许晶)1,2, Xiqian Yu(禹习谦)1,2,3,†, Hong Li(李泓)1,2,3,‡, and Liquan Chen(陈立泉)1,2,3
- 1 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;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Huairou Division, Institute of Physics, Chinese Academy of Sciences, Beijing 101408, China
摘要： 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-Li$_{6}$PS$_{5}$Cl (LPSC) composite anodes above 80 $^\circ$C are thoroughly investigated from the perspectives of interface stability and (electro)chemo-mechanical effect. The chemistry and growth kinetics of Li$_{x}$Si$|$LPSC interphase are demonstrated by combining electrochemical, chemical and computational characterizations. Si and/or Si-P compound formed at Li$_{x}$Si$|$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.
中图分类号: (Lithium-ion batteries)
- 82.47.Aa