Abstract
Lithium-ion batteries are one of the significant energy storage devices today as their capacity is greater than that of NiCd and Lead-acid batteries. Numerous studies have been done to improve the performance of Li-ion batteries. However, there are several factors that can affect these batteries' efficiency. Studying the effect of each parameter on the performance of the battery is costly and time-consuming experiment. Computational modelling and simulation can help researchers to investigate the influence of each of these parameters in various situations. COMSOL Multiphysics is software that makes this process easier as it is a user-friendly software with some useful features like containing different physics equations, designing the geometry of batteries in 1D, 2D, or 3D environments, and demonstrating results in understandable plots and attractive shapes. In this work, we investigated the discharge time of the battery in different temperatures with a 2D simulated model of a Li-ion battery with 50 A/m2 as discharge current density. The material of the positive electrode is LiMn2O4 and the electrolyte is LiPF6. The pores in electrodes are considered to be spherical. The results showed that the discharge time declines as the temperature of the battery decreases. For instance, the discharge time is 1970 S when the temperature is 273 ᵒK while it is 2340 S for T=350 ᵒK. This increase in discharge time may relate to the enhancement of the battery’s performance and the reduction of the resistances inside the battery which can prevent the movement of Li ions and decline the battery’s performance.