A Refined Model of Lithium Battery Considering Agglomerated Active Material and Non-Uniform Graphite Particle

作     者：Song, Guangcheng Xu, Zhicheng Zhang, Chuang Liu, Suzhen Jiang, Kai 

作者机构：State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300130 China Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin300130 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Lithium ion batteries 

摘      要：This study presents a refined lithium-ion battery model based on the Newman model, incorporating agglomerate structures in the positive electrode and non-uniform particle size distribution in the negative electrode. The agglomerates in the positive region consist of nano-scale primary particles, pore spaces, and binders, while the negative region features a random distribution of particle sizes. The model employs the volume averaging method and integrates a thermal model to provide a comprehensive simulation framework. Numerical computation results demonstrate that the proposed model predicts a significantly higher discharge capacity compared to the traditional P2D model. This improvement is primarily due to the increased diffusion distance in agglomerates and the non-uniform particle sizes, which result in substantial changes in overpotential, electrolyte concentration, and solid-phase lithium-ion distribution. The model effectively captures the complex electrochemical behavior during discharge, underscoring the importance of considering structural heterogeneities in battery modeling. © 2024, The Authors. All rights reserved.