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arXiv · 1908.00390

The effect of mechanical stress on lithium distribution and geometry optimisation for multi-material lithium-ion anodes

Ian P. E. Roper·S. Jon Chapman·Colin P. Please
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Abstract

A model is presented for predicting the open-circuit voltage (OCV) and lithium distribution within lithium-ion anodes containing multiple materials, coupling linear elasticity with a stress-dependent chemical potential. The model is applied to a spherical radially-symmetric nano-particle with a silicon core and a graphite shell, highlighting the large effect on lithium distribution and OCV caused by the stress-coupling. Various performance measures based on the expanded volume, the amount of lithium intercalated and the maximum stress induced, are calculated for a silicon core with a graphite shell to enable optimisation of the volume of the silicon core.

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Ian P. E. Roper, S. Jon Chapman, Colin P. Please. 2019-07-04. The effect of mechanical stress on lithium distribution and geometry optimisation for multi-material lithium-ion anodes. https://arxiv.org/abs/1908.00390

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