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首页> 外文期刊>Journal of power sources >Morphology control of lithium iron phosphate nanoparticles by soluble starch-assisted hydrothermal synthesis
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Morphology control of lithium iron phosphate nanoparticles by soluble starch-assisted hydrothermal synthesis

机译：可溶性淀粉辅助水热合成法控制磷酸铁锂纳米粒子的形貌

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摘要

Lithium iron phosphate (LiFePO_4) is a potentially high efficiency cathode material for lithium ion batteries, but the low electronic conductivity and one-dimensional diffusion channel for lithium ions require small particle size and shape control during the synthesis. In this paper, well-crystallized and morphology-controlled LiFePO_4 cathode material for lithium-ion batteries is successfully synthesized via a soluble starch-assisted hydrothermal method at 180 ℃ for 5 h, followed by calcining with phenolic resin at 750 ℃ for 6 h. In this study, we investigate the effect of five different concentrations of starch solution on controlling morphology of LiFePO_4. Interestingly, the nano-sized LiFePO_4 particles obtained in 0.075 mol L~(-1) starch solution exhibit a spheroidal microstructure, while the platelet shape LiFePO_4 particles are synthesized in lower or higher concentration of starch solution. The mechanism and process of forming such spheroidal microstructure is discussed. These unique structural and morphological properties of LiFePO_4 lead to high specific capacity and stable cycling performance. Analysis of the electrochemical impedance spectroscopy reveals that nano-sized carbon/polyacene coated LiFePO_4 cathode materials play an critical role in achieving excellent electrochemical performance.
机译：磷酸铁锂（LiFePO_4）是锂离子电池的潜在高效阴极材料，但锂离子的低电子电导率和一维扩散通道需要在合成过程中实现小粒径和形状控制。通过可溶性淀粉辅助水热法在180℃加热5 h，然后在750℃用酚醛树脂煅烧6 h，成功地合成了结晶良好，形貌可控的锂离子电池LiFePO_4正极材料。在这项研究中，我们调查了五种不同浓度的淀粉溶液对控制LiFePO_4形态的影响。有趣的是，在0.075 mol L〜（-1）淀粉溶液中获得的纳米LiFePO_4颗粒呈球状微观结构，而片状的LiFePO_4颗粒则在较低或较高浓度的淀粉溶液中合成。讨论了形成这种球状微结构的机理和过程。 LiFePO_4的这些独特的结构和形态特性导致高比容量和稳定的循环性能。电化学阻抗谱的分析表明，纳米碳/多并苯涂覆的LiFePO_4阴极材料在实现出色的电化学性能方面起着至关重要的作用。

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  • 来源
    《Journal of power sources》 |2014年第25期|837-844|共8页
  • 作者

    Zhaoyong Chen; Ming Xu; Binglin Du; Huali Zhu; Tian Xie; Wenhua Wang;

  • 作者单位

    School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, 410004, Hunan Province, China;

    School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, 410004, Hunan Province, China;

    School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, 410004, Hunan Province, China;

    School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, 410004, Hunan Province, China;

    School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, 410004, Hunan Province, China;

    School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, 410004, Hunan Province, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lithium iron phosphate; Cathode material; Hydrothermal route; Starch; Morphology control;

    机译：磷酸铁锂;阴极材料;热液路线;淀粉;形态控制;

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