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首页> 外文期刊>Journal of nanomaterials >Synthesis of LiFePO4/Graphene Nanocomposite and Its Electrochemical Properties as Cathode Material for Li-Ion Batteries
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Synthesis of LiFePO4/Graphene Nanocomposite and Its Electrochemical Properties as Cathode Material for Li-Ion Batteries

机译：LiFePO4 /石墨烯纳米复合材料的合成及其作为锂离子电池正极材料的电化学性能

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LiFePO4/graphene nanocomposite was successfully synthesized by rheological phase method and its electrochemical properties as the cathode materials for lithium ion batteries were measured. As the iron source in the synthesis, FeOOH nanorods anchored on graphene were first synthesized. The FeOOH nanorods precursors and the final LiFePO4/graphene nanocomposite products were characterized by XRD, SEM, and TEM. While the FeOOH precursors were nanorods with 5–10 nm in diameter and 10–50 nm in length, the LiFePO4were nanoparticles with 20–100 nm in size. Compared with the electrochemical properties of LiFePO4particles without graphene nanosheets, it is clear that the graphene nanosheets can improve the performances of LiFePO4as the cathode material for lithium ion batteries. The as-synthesized LiFePO4/graphene nanocomposite showed high capacities and good cyclabilities. When measured at room temperature and at the rate of 0.1C(1C = 170 mA g−1), the composite showed a discharge capacity of 156 mA h g−1in the first cycle and a capacity retention of 96% after 15 cycles. The improved performances of the composite are believed to be the result of the three-dimensional conducting network formed by the flexible and planar graphene nanosheets.
机译：流变相法成功合成了LiFePO4 /石墨烯纳米复合材料，并测定了其作为锂离子电池正极材料的电化学性能。作为合成中的铁源，首先合成了锚固在石墨烯上的FeOOH纳米棒。用XRD，SEM和TEM对FeOOH纳米棒的前体和最终的LiFePO4 /石墨烯纳米复合材料进行了表征。 FeOOH的前体是直径为5–10µnm，长度为10–50µnm的纳米棒，而LiFePO4是尺寸为20–100µnm的纳米颗粒。与没有石墨烯纳米片的LiFePO4颗粒的电化学性质相比，很明显，石墨烯纳米片可以改善LiFePO4作为锂离子电池正极材料的性能。刚合成的LiFePO4 /石墨烯纳米复合材料显示出高容量和良好的循环能力。当在室温下以0.1C（1C = 170 mA g-1）的速率测量时，复合材料在第一个循环中显示出156 mA h g-1的放电容量，在15个循环后显示96％的容量保持率。据信，复合材料性能的提高是由柔性和平面石墨烯纳米片形成的三维导电网络的结果。

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