Abstract
Si/graphite composite (Si/G) anodes are now regarded among the most commercially available next-generation anode materials. The development of a fully coupled mechanical-electrochemical model for Si/G anode is an essential tool to design safer and lightweight lithium-ion battery modules/packs. In this paper, we establish an efficient model to study lithium-ion battery (LIB) with Si/G composite anode through the coupling of stress-induced battery model and homogenized mechanical model. By designing strategies for the coupling of mechanical and electrochemical governing equations, a multiphysics model is proposed. Experiments for battery charging with simultaneous various mechanical loadings are conducted to validate the established model. Finally, design-oriented parametric studies for governing factors (e.g., the Si/G mixture ratio and battery size) are discussed. Results provide a fundamental understanding of the failure mechanism of the composite anode and offer a powerful design tool for Si/G composite anode design for better electrochemical performance.
Original language | English (US) |
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Article number | 227667 |
Journal | Journal of Power Sources |
Volume | 450 |
DOIs | |
State | Published - Feb 29 2020 |
Keywords
- Deformation
- Modeling
- Multiphysics coupling
- Si/graphite composite anode
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering