LAUSR

Li3V2−xTix(PO4)3/C(x = 0, 0.02, 0.06, 0.08) composites as cathode material of Li-ion battery with Ti doping was synthesized with carbothermal reduction method, using stearic acid as carbon source. The crystal phase, microstructures, and electrochemical properties of the composites were characterized by XRD, SEM, and electrochemical performance testing. XRD analysis showed that the XRD curve of the Ti-doped composites had no additional reflection curves compared with the XRD curve of the undoped sample, indicating that Ti entered the crystal structure of Li3V2(PO4)3. And the results showed that Ti doping can not only improve the first discharge specific capacity of Li3V2(PO4)3/C composites but also improve its cycle performance at different rate. And Li3V1.94Ti0.06(PO4)3/C samples had the best performance with the first discharge capacity of 121.9 mAhg−1 and 123.5 mAhg−1 with 3.0~4.3 V voltage range and at 0.2 C and 0.5 C rate, respectively. And the capacity retention was 98.69% after 100 cycles at 0.2 C and 98.4% after 15 cycles at 0.5 C, respectively. EIS test results showed that Ti doping affected the charge transfer process and Li-ion transport resistance, and could improve the electrochemical properties of the composites.