Overview of Rechargeable Lithium Battery Systems
Specific capacity of LFP is improved by substituting Mn, Ni or Co for iron and adding silicate, sulfate, or fluoride. Lithium iron phosphate fluoride (Li 2 FePO 4 F) provides 3.6 V and 115 Ah kg −1. Canadian researchers introduced fluorine in iron phosphate in 2007. There is less volume change in the positive electrode during cycling.