Lithium iron phosphate cathode material
1997 AKPadhi first reports of lithium iron phosphate (LiFePO4) from embedded with lithium functions. The material has olivine-type containing phosphate lithium materials, LiMPO4 (M: Mn, Fe, Co, Ni), a great potential for lithium-ion battery cathode materials. Lithium iron phosphate lithium-ion batteries used as a cathode material has a good electrochemical properties, charge and discharge very stable platform, the charging and discharging process of structural stability. At the same time, the material is non-toxic and pollution-free, safe performance, and can be used in high-temperature environment, the advantages of extensive source of raw materials, the Toshiba battery industry is currently competing on the development of the hot spots.
The material has shown, on the crystal structure.
Operating voltage range: 2.5 ~ 3.6 V, platform about 3.3 V, cobalt than the 3.7 V lithium battery acid lower.
As the conductivity of material difference, need to lithium iron phosphate particles within the incorporation conductive carbon material or conductive metal particles, or particles of lithium iron phosphate to the surface coated with conductive carbon material, improve the electrical conductivity of electronic materials, or metal ions doping To improve the electrical conductivity. This low density materials, make the A1078 battery capacity of low-volume ratio, only 180 Wh / L (LiCoO2 can do 400 Wh / L above), in a small cell area, the same size battery only existing battery capacity of less than half.