Introduction of LiFePO4 Cathode Materials for Lithium Batteries
LiFePO4 cathode material is a new type of cathode material for lithium ion batteries. LiFePO4 is a promising cathode material for Li-ion batteries due to its abundant iron resources, low price and non-toxicity.
LiFePO4 belongs to the olivine type structure, and the space group is Pnmb. In this structure, the voltage of Fe3+/Fe2+ relative to lithium metal is 3.4V, the theoretical specific capacity is 170mAh/g, and when LiFePO4 is oxidized to FePO4-, that is, the volume decreases during the charging process, which can compensate for the expansion of the carbon negative electrode volume and help To improve the volume utilization rate of lithium-ion batteries. However, the resistivity of LiFePO4 material is large, and the utilization rate of electrode material is low, so the research work mainly focuses on solving the problem of its electrical conductivity.
One of the effective methods to improve the electrical conductivity of LiFePO4 materials is to coat carbon and add carbon to make composite materials. The capacity of the organic compound precursor by coating carbon before synthesis of LiFePO4 can reach 150mAh/g, and only 1% capacity loss after 10 cycles. Doping metal powders and organometallic salts is another method to improve the electrical conductivity of LiFePO4 materials. S. Y. Chung et al. improved the conductivity of doped LiFePO4 by 8 orders of magnitude by doping a small amount of metal ions (Mg2+, Al3+, Ti4+, Zr4+, etc.).
LiFePO4 battery supplier has high energy density, low price, and excellent safety, making it especially suitable for power batteries.