High Quality Content by WIKIPEDIA articles! The lithium iron phosphate (LiFePO4) battery, also called LFP battery, is a type of rechargeable battery, specifically a lithium-ion battery, which uses LiFePO4 as a cathode material. LiFePO4 batteries have somewhat lower energy density than the more common LiCoO2 design found in consumer electronics, but offers longer lifetimes, better power density (the speed that charge can be drawn from them) and are inherently safer. LiFePO4 is finding a number of roles in vehicle use and backup power.