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采用溶胶-碳热还原法制备了Li3V2-xMx(PO4)3/C(M=Ti,Fe,Ce;x=0.06)复合正极材料,通过XRD、SEM、恒流充放电和电化学阻抗等测试方法研究了Ti4+、Fe3+和Ce3+适量掺杂对材料结构、形貌和电化学性能的影响。结果表明:Ti4+、Fe3+和Ce3+的适量掺杂并未改变材料结构,对材料形貌也未产生明显的影响,但可以在一定程度上降低一次颗粒的尺寸,提高材料的电导率。所有掺杂材料的充放电性能和循环稳定性明显改善,其中Li3V1.94Fe0.06(PO4)3/C表现出最优的电化学性能。
The composite cathode materials of Li3V2-xMx (PO4) 3 / C (M = Ti, Fe, Ce; x = 0.06) were prepared by sol-carbothermal reduction method and characterized by XRD, SEM, constant current charge and discharge and electrochemical impedance Methods The effect of appropriate amount of Ti4 +, Fe3 + and Ce3 + doping on the structure, morphology and electrochemical performance of the materials was studied. The results show that the proper doping of Ti4 +, Fe3 + and Ce3 + does not change the structure of the material and has no obvious effect on the morphology of the material. However, it can reduce the size of the primary particles to a certain extent and increase the conductivity of the material. The charge-discharge performance and cycling stability of all the doped materials are improved obviously. Li3V1.94Fe0.06 (PO4) 3 / C shows the best electrochemical performance.