Nomenclature of LiFePO4
The correct chemical formula of LiFePO4 is LiMPO4. LiFePO4 has an olivine crystal structure. The M of the chemical formula refers to any metal, including Fe, Co, Mn, Ti, etc. The first commercial LiMPO4 was C/LiFePO4 and therefore, people refer to the whole group of LiMPO4 as lithium iron phosphate, LiFePO4. However, more than one olivine compounds, in addition to LiMPO4, may be used as the cathode material of lithium iron phosphate. Such olivine compounds as AyMPO4, Li1-xMFePO4, and LiFePO4-zM have the same crystal structures as LiMPO4 and may be used as the cathode material of lithium ion batteries. (All may be referred to as “LFP”.)
Read more about this topic: Lithium Iron Phosphate