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

Abstract

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.