Synthesis of LiFePO_4/C Composite Cathode Materials by a Novel Carbothermal Reduction Method and Its Performance

LiFePO4/C composite cathode materials were synthesized by a novel carbothermal reduc-tion(CTR) method using glucose as carbon resource. The precursors and the products were characterized by TG-DTA, XRD, TEM, and the reaction mechanism was investigated. The electrochemical performance of the samples was measured. The results show that the new method can reduce synthesis temperature, and the sample prepared at 600℃for 24h can deliver a discharge capacity of 156mAh·g-1 at 0.05C. The first discharge capacities of LiFePO4 at 0.1C, 0.2C, 1C are 146mAh·g-1, 135mAh-g-1, 130mAh·g-1, 121mAh·g-1, respectively. It retains discharge capacity of 119mAh·g-1 at 1C after 30 cycles, with only 1.56% capacity decrease.