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Variation of carbon coatings on the electrochemical performance of LiFePO4 cathodes for lithium ionic batteries

机译：碳涂层对锂离子电池LiFepo4阴极电化学性能的变化

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摘要

The applications of LiFePO4 (LFP) in high-power lithium ion batteries (LIBs) are limited due to its two major drawbacks: poor electronic conductivity and low lithium ion diffusivity, which could be greatly improved chiefly by reducing the size of LFP crystallites to nanoscale and introducing a conductive carbon-coating layer. In this study, asphalt-derived and glucose-derived carbon proved to be soft carbon-coating (SCC) and hard carbon-coating (HCC), respectively. Asphalt and glucose were therefore used as carbon precursors to prepare varied carbon-coated LFP nanoparticles. The electrochemical properties of the LFP/carbon composites were studied using cyclic voltammetry, electrochemical impedance spectroscopy and charge/discharge cycling. The effects of variation of carbon coatings on the electrochemical performance of LiFePO4 cathodes was investigated in detail, and it was found that LFP/SCC showed a superior performance in capacity and rate capability than that of LFP/HCC. It was therefore concluded that soft carbon coating on LFP exhibits better electrochemical performance than hard carbon coating, demonstrating that asphalt could be used as a cheap and efficient carbon source material of LiFePO4 cathodes for LIBs.
机译：由于其两个主要缺点，LiFepo4（LFP）在高功率锂离子电池（Libs）中的应用是有限的：电子导电性差和低锂离子扩散率，这主要通过降低LFP微晶至纳米级的尺寸来大大提高并引入导电碳涂层。在该研究中，分别证明了沥青衍生的碳酸和葡萄糖衍生的碳，分别是软碳涂层（SCC）和硬碳涂层（HCC）。因此，沥青和葡萄糖被用作碳前体以制备变化的碳涂覆的LFP纳米颗粒。使用循环伏安法，电化学阻抗光谱和充电/放电循环研究了LFP /碳复合材料的电化学性质。详细研究了碳涂层变化对LiFePO4阴极电化学性能的影响，发现LFP / SCC显示出比LFP / HCC的能力和速率能力的优异性能。因此得出结论，LFP的软碳涂层比硬碳涂层表现出更好的电化学性能，表明沥青可以用作Libepo4阴极的廉价和有效的碳源材料。

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  • 来源
    《RSC Advances》 |2017年第70期|共7页
  • 作者

    Jiang Weiwei; Wu Mengqiang; Liu Fei; Yang Jian; Feng Tingting;

  • 作者单位

    Univ Elect Sci &

    Technol China Sch Energy Sci &

    Engn CAEET Chengdu 611731 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Sch Energy Sci &

    Engn CAEET Chengdu 611731 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Sch Energy Sci &

    Engn CAEET Chengdu 611731 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Sch Energy Sci &

    Engn CAEET Chengdu 611731 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Sch Energy Sci &

    Engn CAEET Chengdu 611731 Sichuan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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