How a LiFePO₄ Battery Works (Basic Principle)

A lithium iron phosphate (LiFePO₄) battery is a type of lithium-ion battery that uses LiFePO₄ as the cathode material and a graphite carbon electrode as the anode. During discharge, lithium ions (Li⁺) move from the anode (negative electrode) through the electrolyte and separator to the cathode (positive electrode). Electrons flow through the external circuit, providing power. During charging, an external voltage forces the lithium ions to move back from the cathode to the anode, where they are stored. The key advantage of LiFePO₄ lies in its olivine crystal structure, which provides excellent thermal and chemical stability. This structure allows for safe, high-rate discharge and a very flat voltage plateau (around 3.2V per cell), making it ideal for applications requiring consistent power output and long cycle life.