|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Materials for Energy Conversion and Storage
||Inelastic Shape Changes of Silicon Particles and Stress Evolution at Binder/Particle Interface in a Composite Electrode during Lithiation/Delithiation Cycling
||Siva Nadimpalli, Vivek Shenoy, Hailong Wang
|On-Site Speaker (Planned)
Stress evolution in Si-binder composite was modeled using diffusion induced stress framework available in finite element software. A simple model that contains two spherical Si particles with and without the polymer binder film was considered. The particles were lithiated/delithiated at two different rates: one representing a slow charging case which results in a uniform Li concentration throughout the Si particles and the other representing a fast charging condition which results in non-uniform lithium concentration within the spherical Si particles. The inelastic shape changes and associated contact forces predicted by the model are qualitatively consistent with experimental data. Further, the effect of binder mechanical properties and the binder fraction on the stress evolution was calculated. The proposed model, although simple, can guide a battery design engineer to choose a proper binder, charge/discharge strategy, and binder fraction for a durable electrode design.
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