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摘要:In this work,spherical Li Fe PO4/C composite had been synthesized by co-precipitation and spray drying method.The structure,morphology and electrochemical properties of the samples were characterized by X-ray diffraction(XRD),scanning electron micrograph(SEM),transmission electron microscope(TEM),constant current charge-discharge tests and electrochemical impedance spectroscopy(EIS) tests.The spherical Li Fe PO4/C particles consisted of a number of smaller grains.The results showed that the morphology of Li Fe PO4/C particles seriously affected the Li-ion diffusion coefficient and electrochemical properties of lithium ion batteries.Electrochemical tests revealed the spherical Li Fe PO4/C composite had excellent Li-ion diffusion coefficient which was calculated to be 1.065×10-11 cm2/s and discharge capacity of 149(0.1 C),139(0.2 C),133(0.5 C),129(1 C) and 124 m Ahg-1(2 C).After 50 cycles,the capacity retention rate was still 93.5%.
会议名称:

The 2nd International Conference on Materials Science and Engineering Technology (MSET 2015)

会议时间:

2015-04-25

会议地点:

中国上海

  • 专辑:

    工程科技Ⅰ辑

  • 专题:

    无机化工; 材料科学

  • 分类号:

    TQ131.11;TB33

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