ScholarWorks@성균관대학교

초록

The importance of developing batteries with high reliability and safety, capable of withstanding various environmental factors and long-term use, is growing. Silicon materials have gained attention due to their high theoretical capacity, low potential difference with lithium, and abundant resources. However, significant challenges such as volume expansion and efficiency degradation due to energy loss remain. To address these issues, comprehensive understanding of electrical, chemical, thermal, and mechanical properties are required incorporating chemical potential, stress, and species transport. This study presents a multiphysics simulation model focusing on the mechanical energy dissipation of silicon anodes, particularly emphasizing expansion and plastic deformation. Implemented in the MATLAB environment, the model calculates the dissipation of electrical, chemical, thermal, and mechanical energy and demonstrates the state of charge (SOC) during charging and discharging cycles. The SOC varies with energy dissipation and anisotropy across different C-rates, and the results provide a comparative analysis of strategies to improve the mechanical stability of silicon anodes. The model validates galvanostatic responses under various C-rate conditions, and cycle-based energy dissipation, highlighting the necessity of mechanical dissipation in the development of next-generation silicon anodes. Future works will focus on the mechanical dissipation in alloying-based anodes such as SnBi. This research highlights the long-term stability and cyclic efficiency of alloying-based anodes for high capacity and durable battery systems.

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