Abstract: Firstly, the precursor powder FePO4/PANI was synthesized by polymerization reaction.Then, the cathode material LiFePO4 was synthesized by using LiOH·H2O, FePO4/PANI and PVA as the raw materials.In addition the carbon-coated and Ti4+-doped material were synthesized simultaneously.These three samples were marked as LiFePO4, LiFePO4/C and LiFe0.96Ti0.02PO4/C.Their respective microstructure and characteristics were investigated via XRD, EDS and charge-discharge tests.The XRD patterns agree well with the standard LiFePO4 pattern and without amorphous carbon.Comparing with sample LiFePO4/C, LiFe0.96Ti0.02PO4/C has approximate electronic conductivity and higher Li+ diffusion coefficient.Ti4+ distributes in the lattice evenly.Thus, LiFe0.96Ti0.02PO4/C has better electrochemical performances than the other samples.It's initial discharge capacities are 158.7 mAh·g-1,153.3 mAh·g-1,147.6 mAh·g-1,136.4 mAh·g-1 and 123.5 mAh·g-1 at C/10、C/2、1C、3C and 5C rate respectively.The rate performance and potential stability of LiFe0.96Ti0.02PO4/C are favorable.

Key words: Firstly, the precursor powder FePO4/PANI was synthesized by polymerization reaction.Then, the cathode material LiFePO4 was synthesized by using LiOH·H2O, FePO4/PANI and PVA as the raw materials.In addition the carbon-coated and Ti4+-doped material were synthesized simultaneously.These three samples were marked as LiFePO4, LiFePO4/C and LiFe0.96Ti0.02PO4/C.Their respective microstructure and characteristics were investigated via XRD, EDS and charge-discharge tests.The XRD patterns agree well with the standard LiFePO4 pattern and without amorphous carbon.Comparing with sample LiFePO4/C, LiFe0.96Ti0.02PO4/C has approximate electronic conductivity and higher Li+ diffusion coefficient.Ti4+ distributes in the lattice evenly.Thus, LiFe0.96Ti0.02PO4/C has better electrochemical performances than the other samples.It's initial discharge capacities are 158.7 mAh·g-1,153.3 mAh·g-1,147.6 mAh·g-1,136.4 mAh·g-1 and 123.5 mAh·g-1 at C/10、C/2、1C、3C and 5C rate respectively.The rate performance and potential stability of LiFe0.96Ti0.02PO4/C are favorable.