曲折
材料科学
多孔性
粒子(生态学)
椭球体
电极
工作(物理)
机械
粒径
电解质
相(物质)
多孔介质
化学物理
热力学
复合材料
化学工程
物理
工程类
地质学
海洋学
量子力学
天文
作者
Jay Santoki,Simon Daubner,Daniel Schneider,Marc Kamlah,Britta Nestler
标识
DOI:10.1088/1361-651x/ac11bc
摘要
Abstract Improvements concerning the capacity and rate-capability of battery systems can not only be achieved by choosing suitable materials, but also by tailoring the electrode morphologies. Thus, a simulation study is performed to understand the influence of various microstructural properties such as particle size, porosity, and tortuosity on the transport mechanism. In this work, the classical Cahn–Hilliard model is extended to a multiple particle model system. We consider ellipsoid-like particles as an example, however, the model can be readily applicable to particles of complicated geometries. According to the diffusional properties of electrode and electrolyte, a study is conducted on transportation rate dependence with the electrode structures. Under Dirichlet conditions for concentration, simulation results predict a linear dependence of the characteristic time on tortuosity. These lines are converging with variation in particle size at higher tortuosity values, while they are diverging with variation in porosity. Furthermore, the results suggest that systems consisting of smaller particles are limited by surface reaction while larger particles tend toward the bulk-transport limited theory derived for planar electrodes.
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