A review of the Doping Modification of LiFePO4 as a Cathode Material for Lithium Ion Batteries

In the today that energy crisis and the rapid development of electronic equipment, lithium-ion batteries, as a kind of energy storage device with high energy density, safe and cheap, have become a hotspot of research. Lithium iron phosphate (LiFePO4) has attracted wide attention in the field of large-capacity power lithium-ion batteries for its advantages of good stability, low raw material cost and environmental friendliness, and is considered to be one of the most potential lithium-ion battery cathode materials. However, the low intrinsic conductivity and lithium ion diffusion coefficient limit its development and application in the further. For a long time, various methods have been studied to improve its performance. This article will systematically describe the effects of doping of metal element, doping of non-metallic element and doping of metallic simple substance or metal oxide on the electrochemical performance of LiFePO4, and summarize the latest research progress in the modification of doping of LiFePO4 in recent years. Different doped particles have different effects on the performance of LiFePO4 cathode materials. An appropriate amount of doping can often improve the performance of LiFePO4 cathode materials to a certain extent. Multi-element co-doping of LiFePO4 is expected to be an important way to effectively improve its electrochemical performance.