Optimization of LiB electrode with bi-diameter active particles using a microstructure-resolved model  

作　　者：Peng Zhang Junqi Weng Ping Li Guanghua Ye Wenli Du Xinggui Zhou 

机构地区：[1]Key Laboratory of Smart Manufacturing in Energy Chemical Process,Ministry of Education,East China University of Science and Technology,Shanghai,200237,China [2]BASF(China)Company Ltd.,Shanghai,200137,China [3]State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai,200237,China

出　　处：《Particuology》2024年第12期49-61,共13页颗粒学报（英文版）

基　　金：supported by the National Key R&D Program of China (grant No.2023YFB4006101);the National Natural Science Foundation of China (grant No.22378115).

摘　　要：The microstructure of electrodes significantly affects the performance of lithium-ion batteries(LiBs),and using bi-diameter active particles is a simple but effective way to regulate the microstructure of commercial LiB electrodes.Herein,to optimize the LiB cathode of bi-diameter active particles,a microstructure-resolved model is developed and validated.The results indicate that randomly packing of bi-diameter active particles is optimal when the electrolyte diffusion limitation is mild,as it provides the highest volume fraction of active materials.Under strong electrolyte diffusion limitations,layered packing with small particles near the separator is preferred.This is because particles near the current collector have a low lithiation state.Besides,optimizing the random packing can further improve the energy density.For energy-oriented LiBs,a low volume fraction of small particles(0.2)is preferred due to the higher volume fraction of active materials.For power-oriented LiBs,a high volume fraction of small particles(0.8)is better because it reduces diffusion limitations.This work should serve to guide the optimal design of electrode microstructure for achieving high-performance LiBs.

关 键 词：Lithium-ion battery Electrode microstructure Bi-diameter particles Diffusion limitation Microstructure-resolved model 

分 类 号：TM912[电气工程—电力电子与电力传动]