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| Microstructure modeling of polycrystalline particles based on force-equilibrium packing methods |
| Received:January 01, 2024 Revised:February 20, 2024 |
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| DOI：10.7511/jslx20240101001 |
| KeyWord:particle packing force-equilibrium Weibull distribution particle microstructure |
| Author | Institution |
| 黄洪涛 |
同济大学 航空航天与力学学院, 上海 |
| 赵莹 |
同济大学 航空航天与力学学院, 上海 |
| 陈宗立 |
同济大学 航空航天与力学学院, 上海 |
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| Abstract: |
| The active material of lithium-ion battery cathode usually consists of particles with a polycrystalline structure.The constituents are primary grains whose size,shape and orientation have a great deal of randomness.Thus,it is essential to effectively complete an objective topological description of active particle microstructures,in order to conduct a reliable chemo-mechanical simulation of lithium-ion batteries and to provide guidelines for microstructure optimization.The traditional grain modeling methods usually suffer from the problems of low computational efficiency or poor fitness with a real microstructure in terms of size distribution.In this work,a random packing method based on an equivalent truss structure and force equilibrium is proposed to update the displacement of each particle according to physical principles,thus providing a more natural and faster route towards a stable particle packing structure.In addition,the paper utilizes the tessellation topology of the particles to draw the grain boundaries of the particles and finally to construct the particle microstructure.Both two-dimensional and three-dimensional models under respective spherical and circular boundaries are considered in the paper,and the relationship between particle packing with different size distributions and the physical microstructure of the particle is analyzed. |
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