Fractal modeling and thermal chemical coupling of electrode microstructure of lithium battery

doi:10.19799/j.cnki.2095-4239.2022.0299

Abstract

Abstract:

The electrode of a lithium ion battery is the crucial factor in determining the performance of the battery. According to the porous electrode theory, fractal theory is introduced to reconstruct the microstructure of the electrode. The theoretical model of the effective diffusion coefficient of lithium-ion in solid and liquid phases is deduced, and its influencing factors are analyzed, taking into account the impact of structural characteristics and temperature on the effective diffusion coefficient. The relationship between the thermal and electrochemical models is established, and the thermal chemical coupling model is examined. The discharge process is simulated to explore the effects of different solid and liquid effective diffusion coefficients on the discharge performance. The results demonstrate that the effective diffusion coefficient of lithium-ion in the liquid phase increases with the increasing porosity, temperature, and area fractal dimension while decreasing with increasing tortuous fractal dimension. The solid diffusion coefficient decreases with the increase in area fractal dimension. In the case of comparatively high rate discharge, altering the particle size and distribution of the negative electrode changes the microstructure of the electrode so that the effective diffusion coefficient of lithium-ion in the solid and liquid phases changes, which further influences the maximum discharge capacity of the battery. This result provides basic theoretical knowledge for manufacturing lithium-ion battery electrodes.

Key words: lithium-ion battery, fractal theory, electrode microstructure, effective diffusion coefficient, particle size

CLC Number:

TM 911.3

Zhenyi WANG, Sai ZHANG, Shiwang HU. Fractal modeling and thermal chemical coupling of electrode microstructure of lithium battery[J]. Energy Storage Science and Technology, 2022, 11(11): 3574-3582.

Figures/Tables 11

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