Effect of pore shapes on the overall electrical conductivity of cathode material in Li-ion batteries
Effect of pore shapes on the overall electrical conductivity of cathode material in Li-ion batteries
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DOI：
10.1016/j.ijengsci.2019.103187
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发表时间：
2020
影响因子：
6.6
通讯作者：
E. Vilchevskaya;I. Sevostianov
中科院分区：
文献类型：
--
作者：
E. Vilchevskaya;I. Sevostianov
本文的重点是开发和验证一个定量微观力学模型，以评估锂离子电池电极的整体电导率。基于微观结构观察，将阴极建模为由PVDF/C基体、由活性组分Li(Ni1/3Co1/3Mn1/3)O2组成的球形颗粒、扁球状石墨颗粒和凹孔组成的多相复合材料。使用麦克斯韦均质技术评估了这种多相材料的有效电导率，并与文献中可用的实验数据进行了比较。该协议通常是非常好的，并且允许提取有关多孔空间几何形状的信息，以评估材料的其他物理性质。
The paper focuses on the development and verification of a quantitative micromechanical model for evaluation of the overall electrical conductivity of electrodes in Li-ion batteries. Based on microstructural observations, the cathode is modeled as a multiphase composite consisting of PVDF/C matrix, spherical particles made of the active component Li(Ni1/3Co1/3Mn1/3)O2, oblate spheroidal graphite particles and concave pores. Effective electrical conductivity of such a multiphase material is evaluated using Maxwell homogenization techniques and compared with the experimental data available in literature. The agreement is generally very good and allow extraction of information about porous space geometry required for evaluation of other physical properties of the material.