Effect of ion doping on the electrochemical performances of LiFePO4- Li3V2( PO4) 3 composite cathode materials

Due to its low intrinsic electronic and ionic conductivities, olivine-structured LiFePO4 has been the focus of research into ionic modifications of LiFePO4/ C cathode materials. Various ionic doping processes have been developed for enhancing the electrochemical performances of lithium-ion batteries, including cation and anion doping of LiFePO4. In particular, significant progress has recently been made in understanding and controlling the syntheses, nanostructures and electrochemical performances of LiFePO4- Li3V2( PO4)(3) composite materials. However, there are still many challenges in achieving good charge transfer kinetics and charge- discharge performances of LiFePO4- Li3V2( PO4)(3) composite cathodes. In this review, we summarize some of the recent progress in several typical cation modification methods.