磷酸铁锂/石墨烯复合正极材料的制备与电化学性能研究
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Fabrication of LiFePO4/Graphite Composite Materials and Their Electrochemical Performances
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    摘要:

    介绍了一种将石墨烯(Graphite)引入锂离子电池正极材料磷酸铁锂(LiFePO4)中获得LiFePO4/graphite复合材料的制备方法。首先以碳酸锂、草酸亚铁、磷酸氢二铵和葡萄糖为原材料,采用高温固相法合成了碳包覆的LiFePO4前躯体,再通过固相粉体混合的工艺加入不同百分比的石墨烯,制备出磷酸铁/石墨烯锂离子电池正极复合材料;对所制备的复合材料组装成纽扣电池进行性能测试; 结果表明:复合材料的电化学性能显著提高,在0.1 C放电倍率条件下,LiFePO4+1wt%graphite复合材料的首次放电容量从LiFePO4基体材料的131.75 mAh/g提高到146.51 mAh/g,LiFePO4+1wt%graphite复合材料的充电性能和放电性能分别提高了5.8%和4.8%。

    Abstract:

    In this job, the graphite was introduced to Lithiumion battery LiFePO4 anode material to fabricate LiFePO4/Graphite composite material.At first, Carbon coated LiFePO4 precursor was prepared by high temperature solid phase synthesis method using LiCO3, FeC2O42H2O, (NH4)2HPO4 and C6H12O6 as raw materials, then different percentage of graphite was added by a solid powder mixed process to obtain LiFePO4/Graphite composite material.The obtained composite materials were assembled into button battery to test the electrochemical property.The testing results show that the electrochemical performance has been improved greatly.Compared with LiFePO4 matrix material, the first time discharge capacity of LiFePO4+1wt% graphite Composite material increased from 131.75mAh/g to 146.51 mAh/g at 0.1C rate.The charging and discharge performances of LiFePO4+1wt%graphite Composite materials have been improved by 5.8% and 4.8%, respectively.

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杨洪, 朱朝宽, 刘洋, 彭沫锜, 薛雯娟, 王联.磷酸铁锂/石墨烯复合正极材料的制备与电化学性能研究[J].重庆工商大学学报(自然科学版),2017,34(5):61-66
YANG Hong, ZHU Chaokuan, LIU Yang, PENG Moqi, XUE Wenjuan, WANG Lian. Fabrication of LiFePO4/Graphite Composite Materials and Their Electrochemical Performances[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2017,34(5):61-66

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  • 在线发布日期: 2017-09-22
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