The effects of cell porosity and thickness upon the performance of lithium-ion battery

Rosszainily, Hawa Najihah Asni (2019) The effects of cell porosity and thickness upon the performance of lithium-ion battery. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study focuses on the effect of cell porosity and thickness upon the performance of lithium ion batteries (LIDs). Nowadays, the demand of high efficiency of Lithiumion batteries is growing as the result of exponential growth of electronic device among consumers and in industrial sectors. The fact of the exposure of Lills to open arr could cause an explosion and small batteries capacities become its massive drawback. Hence, the purpose of tills study are to produce and verify the numerical solutions of LIDs modelling for LiFeP04 half-cell cathode in order to analyse the effect of cell porosity ( &" ) , radius of particles ( a0 ) , and thickness ( L) upon the performance of litruum-ion batteries by observing the discharge curves. One of the components to achieve high performance LIDs is by optimjzing the geometry of the cell. A mathematical models of LIDs based on drift diffusion model takes into account the electrolyte equation and lithium transport equation in the electrode particles which incorporated the geometry of cell microstructure to the coefficients in a macroscopic model. The multi-scale model is solved numerically using Finite Difference Method (FDM), and the simulated discharge curve for O.SC and LC discharge current have been verified with experimental data. The effect of geometry variation on the di scharge curve are examined by varying three parameters namely porosity ( &,. ), size of particles ( a0 ) and cell thickness ( L) while other parameters are remained same. As results, the constructed simulation shows that the higher volume fraction (porosity content) produces large di scharge curves while decreasing the size of electrode particles increase the capacity of the cell. Meanwhile, less electrode thickness is most likely to give better battery performance as compared to wide thickness of electrodes.

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