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分别采用固相-水热法和球磨法制备磷酸亚铁锂-磷酸钒锂复合正极材料(LiFePO4-Li3V2(PO4)3)。电化学性能测试表明,LiFePO4-Li3V2(PO4)3复合正极材料的电化学性能远远高于 LiFePO4和 Li3V2(PO4)3单独作为正极材料的性能,并且以固相-水热法制备的复合材料性能优于以球磨法制得的复合材料。研究发现 LiFePO4-Li3V2(PO4)3复合材料有 4 个氧化还原峰,相当于 LiFePO4 和 Li3V2(PO4)3 氧化还原峰的叠加。采用固相-水热法制备的LiFePO4-Li3V2(PO4)3 复合材料形貌较为规则,且有新相物质产生,这是导致其电化学性能较好的原因。
LiFePO4-Li3V2 (PO4) 3 cathode materials were prepared by solid-phase hydrothermal method and ball milling respectively. Electrochemical tests show that the electrochemical performance of LiFePO4-Li3V2 (PO4) 3 composite cathode material is much higher than that of LiFePO4 and Li3V2 (PO4) 3 alone as the cathode material, and the composite prepared by solid-phase hydrothermal method The performance is better than that obtained by ball milling. It is found that there are 4 redox peaks in LiFePO4-Li3V2 (PO4) 3 composite, which is equivalent to the superposition of the redox peaks of LiFePO4 and Li3V2 (PO4) 3. The morphology of LiFePO4-Li3V2 (PO4) 3 composite prepared by solid-phase hydrothermal method is more regular and new phase materials are produced, which is the reason of its good electrochemical performance.