Modelling and Performance Analysis of Li-ion Batteries with Silicon Anode

The integration of silicon as an anode material in lithium-ion batteries requires additional testing due to potential impacts on ion and electron transport during the lithiation process. This study involves modeling and performance analysis of lithium-ion batteries using MATLAB Simulink to evaluate charging and discharging capabilities. The Equivalent Circuit Model (ECM) simulates the battery's electrical characteristics through variables such as voltage, current, resistance, and capacitance. The model's equations are derived from passive electrical network theory, resulting in a low-dimensional, generally nonlinear system of ordinary differential equations influenced by temperature (T) and state of charge (SOC). The results show that the battery's initial temperature is around 298 K (approximately 25°C), which is close to room temperature, with a slight increase over time. The discharge current exceeds the charge current, leading to a faster discharge cycle compared to charging. Experimental data indicate a minimal drop in battery voltage during discharge. The battery temperature began at roughly 298 K and rose modestly over time, suggesting stable operation due to controlled conditions or minimal load. The discharge current was higher than the charge current, causing a quicker discharge relative to charging. Although there were minor voltage drops during discharge and a rapid decline during charging, overall stability was maintained.