文献类型：期刊文献

英文题名：Li15Si4accumulation induced failure in high-Si core-shell anodes for lithium-ion batteries

作者：Gao, Zhaochen[1]; Shi, Xinyuan[1]; Wang, Xiaoxiao[1]; Chen, Haofeng[1,2,3]; Wang, Leiyuan[1]

机构：[1] Key Laboratory of Pressure Systems and Safety [DOE], School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Shanghai Institute of Aircraft Mechanics and Control, 130 Meilong Road, Shanghai, 200237, China; [3] Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety, School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan, 430205, China

年份：2026

卷号：3208

期号：1

外文期刊名：Journal of Physics: Conference Series

收录：EI(收录号：20261620523932)

语种：英文

外文关键词：Anode materials - Anodes - Carbon - Carbon cycle - Failure (mechanical) - Lithium compounds - Lithium-ion batteries - Outages - Particle size analysis - Safety engineering - Silicon - Silicon batteries - Silicon compounds

摘要：Commercially available silicon-carbon materials are currently limited to only 20% silicon content, primarily due to the unclear failure mechanisms in materials with higher silicon content, which complicates targeted optimisation efforts. This study offers a comprehensive analysis of the relationship between lifespan degradation and particle damage in core-shell silicon-carbon (Si-C) materials with high silicon content. It identifies and elucidates the failure mechanisms of Si-C during cycling, specifically highlighting the role of carbon in the lithium de-intercalation/intercalation process. The findings show that the primary cause of failure in silicon-carbon particles is electrochemical degradation, where lithium-ions form stable Li15Si4 compounds with silicon, irreversibly depleting the active silicon and leading to particle breakdown. Furthermore, the study introduces the size-dependent effect on particle degradation, proposing a particle size threshold (Lg) that serves as a boundary between mechanical and electrochemical failure modes, providing a scalable pathway for manufacturing practical high-silicon-content anodes. The research offers valuable insights into the failure mechanisms of silicon-carbon materials used in high-energy-density batteries, which holds significant engineering implications for their practical applications. ? Published under licence by IOP Publishing Ltd.