Impact of electrode structure parameters on energy and power for lithium-ion cells

doi:10.19799/j.cnki.2095-4239.2020.0381

Abstract

Abstract:

A simulation-based design method for batteries can replace the trial-and-error method, which is based on the repeated sampling and design of experiments, significantly shortening the product development cycle, reducing the cost of materials and energy, and improving the product innovation ability. In this work, the influence of the electrode structure parameters on the power, energy, specific power, and specific energy is investigated on the basis of a three-dimensional thermo-electrochemical coupling model. Further, the mechanism is revealed using the overpotential decomposition method with constant cell size and capacity. The results indicate that the electrode structure parameters have different effects on various performances. The following design relations should be considered: First, the electrode structure with considerable thickness and small porosity improves the battery energy but obstructs liquid phase transportation and affects the power. Conversely, the electrode structure with a small thickness and high porosity improves power performance but may increase the total mass of the battery and decrease the specific power. Finally, the effect of thin coating and porous design scheme on the improvement of power performance decreases gradually, and after a certain threshold, reducing the thickness and increasing the porosity will not improve the liquid phase transportation anymore. Other restrictions should be considered in this situation.

Key words: lithium-ion cell, three-dimensional thermal-electrochemical coupling model, electrode structure, power performance, energy performance

CLC Number:

TM 912

Anhao ZUO, Ruqing FANG, Zhe LI. Impact of electrode structure parameters on energy and power for lithium-ion cells[J]. Energy Storage Science and Technology, 2021, 10(2): 470-482.

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