Research Progress of LiFePO4 Cathode for Lithium-ion Batteries

Lithium-ion batteries(LIBs), with their high energy density and desirable cycling performance, have become the dominant battery technology for everything from portable electronics to electric vehicles. In recent years, lithium iron phosphate (LiFePO4) has been regarded as one of the most attractive cathode materials for lithium-ion batteries due to its good cycling stability, low price and excellent safety. However, the rapid development of LiFePO4 is limited by key challenges such as low conductivity and low diffusion rate of Li+. In order to improve these defects, many studies have been carried out to improve the electrochemical performance of LiFePO4. In this paper, the basic structure, charge-discharge principle, preparation method and modification of lithium iron phosphate are reviewed, and the research on improving the electrochemical performance of lithium iron phosphate at home and abroad are reviewed, including surface coating, ion doping and material nanocrystallization. At last, the development trend of this field is prospected, and the direction of future research is suggested.