Simulation analysis on sensitivity of discharge capacity on design parameters of a battery

doi:10.19799/j.cnki.2095-4239.2022.0681

Abstract

Abstract:

This study established a classic P2D electrochemical simulation model for lithium-ion batteries. The effects of five parameters on the discharge capacity of the battery were quantitatively analyzed by simulation method, including the diameter of active particles on the cathode and anode, the thickness of the cathode and anode, and the separator thickness, which are of great significance to provide guidelines for optimizations. The simulation results showed that the diameter of active particles on the cathode could influence the tendency of capacity vs. voltage curves after the voltage is higher than 3.3 V. In contrast, the diameter of negative active particles affects the entire voltage window of the capacity vs. voltage curves. Secondly, the thickness of cathode electrode impacts the entire voltage of capacity vs. voltage curves. The thickness of the anode electrode on capacity vs. voltage curves leads to a fluctuation below the voltage of 3.6 V. According to the simulation results, only the thicknesses of cathode and anode electrodes give positive response to the battery discharge capacity. At the same time, the diameter of negative particles negatively responds to the battery discharge capacity. However, cathode particle diameter and separator thickness are insensitive to discharge capacity. Moreover, all the parameters accord with the quadratic equations.

Key words: battery, rate property, simulation, sensitivity

CLC Number:

TG 156

Xiaoxue PU, Shaobo YANG, Aixue TUO, Lisha MOU, Qi NA. Simulation analysis on sensitivity of discharge capacity on design parameters of a battery[J]. Energy Storage Science and Technology, 2023, 12(3): 951-959.

Figures/Tables 15

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项目	细分参数	单位	负极	隔膜	正极
模型参数	电极厚度	μm	65	16	52
	活性材料体积分数	—	0.68	—	0.70
	电解液体积分数	—	0.275	0.45	0.215
	基体电导率	S/m	100	—	4
	颗粒半径	μm	16	—	5
	最大固相浓度	mol/m³	30997	—	48766
	初始嵌锂态	—	0.867	—	0.21
	初始固相浓度	mol/m³	26874	—	10240
电化学参数	初始液相浓度	mol/m³	—	1000	—
	电荷转移系数^[18-19]	—	0.5	—	0.5
	Bruggeman系数^[20]	—	1.5	1.5	1.5
	Li⁺迁移数^[18-19]	—	—	0.363	—

分类	因素名称	代号	波动范围
粒径	正极活性物质粒径	D_pos	2～20 μm
粒径	负极活性物质粒径	D_neg	5～30 μm
厚度	正极极片厚度	pos	44～52 μm
	负极极片厚度	neg	60～72 μm
	隔膜厚度	sep	2～22 μm
孔隙率	隔膜孔隙率	porosity_sep	30%～46%

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