Influence of calendering process on the structural mechanics and heat transfer characteristics of lithium-ion battery electrodes via DEM simulations--颗粒学报PARTICUOLOGY

Zhang, J., Sun, J., Huang, H., & Yuan, Z. (2024). Influence of calendering process on the structural mechanics and heat transfer characteristics of lithium-ion battery electrodes via DEM simulations. Particuology, 85, 252-267. https://doi.org/10.1016/j.partic.2023.06.015

Influence of calendering process on the structural mechanics and heat transfer characteristics of lithium-ion battery electrodes via DEM simulations

Junpeng Zhang ^a, Jingna Sun ^a *, Huagui Huang ^a, Zhenge Yuan ^b

a National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao, 066004, China
b Xingtai Naknor Technology Co., Ltd, Xingtai, 054000, China

10.1016/j.partic.2023.06.015

Volume 85, February 2024, Pages 252-267

Received 12 May 2023, Revised 19 June 2023, Accepted 24 June 2023, Available online 8 July 2023, Version of Record 23 July 2023.

E-mail: sjn@ysu.edu.cn

Highlights

• Utilizing a DEM simulation to investigate correlation between calendering, structure, and heat transfer of NMC cathode.

• Uncovering the mechanism of the influence of structural anisotropy on heat transfer anisotropy of the electrode.

• Establishing calculation methods for the thermal conductivity of the electrode and the interfacial thermal resistance.

Abstract

Elucidating the intricate correlation between calendering, structure, and performance is crucial to comprehending the relationship between performance parameters and process steps of lithium-ion batteries (LIBs). Discrete element method (DEM) simulations were adopted in this work to calculate the interparticle force and stress tensor under incremental calendering process conditions, which revealed the effect of the anisotropy of complex contact force network on the anisotropy of heat transfer within porous electrode. The thermal conductivity of electrode was predicted using porosity to characterize the process–structure–performance correlation. The comprehensive influence of contact number and contact area between particles and current collector determines the magnitude of interfacial thermal resistance and interfacial heat transfer coefficient. For the first time, this work quantitatively analyzed the structural mechanics and heat transfer mechanism during calendering process of porous electrodes, and the results indicate a promising way to optimize and design battery electrode structures.

Graphical abstract

Keywords

Li-ion battery electrode; Structural mechanics; Anisotropy; Thermal conductivity; Discrete element method

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