Abstract
AbstractIn lithium batteries, multicomponent compositions like LiCoO2 or LiFePO4 are used as cathode material and single substances like graphite are employed as anode material. In the latest battery developments anodes of silicon are introduced. Unfortunately, by now the high volumetric changes of silicon during intercalation — sometimes a factor of four has been reported — lead to pulverization of the anode and restrict long term use. To account for the intercalation induced volumetric swelling and phase segregation in a numerical simulation, the mechanical, thermal, chemical and electrical equations have to be coupled which leads to a complex description based on fourth order partial differential equations. Additionally, the structure of the anode needs to provide minimal compliance but maximal conductivity. In our contribution we provide a concept to combine these competing objectives with a multi‐physics model of battery charging.
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