Effect of symbiotic compound Fe2P2O7 on electrochemical performance of LiFePO4/C cathode materials

The LiFePO4/Fe2P2O7/C cathode materials were synthesized by in-situ synthesis method. The existence of Fe2P2O7 does not alter LiFePO4 crystal structure and the existence of Fe2P2O7 decreases the particles size of LiFePO4. The charge-discharge specific capacity and apparent lithium ion diffusion coefficient increase with Fe2P2O7 content. However, excessive Fe2P2O7 will block the electron transfer pathway and affect the electrochemical performances of LiFePO4 directly.164