Modeling of Li $_{x}$ FePO $_{4}$ Cathode Li-Ion Batteries Using Linear Electrical Circuit Model

It is demonstrated that a physical-based equivalent electrical circuit could be developed based on electrochemical impedance spectroscopy (EIS) to describe electrochemical performance of a commercial Li_1-xPO₄-cathode, Li-ion cell. This model uses only EIS modeling and Fourier transform techniques to provide reasonably accurate voltage performance characteristics while providing insight into the physical processes at work in the cell.