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Organic-phase synthesis of Li3V2(PO4)(3)@Carbon nanocrystals and their lithium storage properties

机译：Li3v2（PO4）（3）甲碳纳米晶及其锂储存性能的有机相合成

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摘要

Decreasing particle size is an efficient strategy for improving the lithium storage properties of Li3V2(PO4)(3) (LVP) due to a shorter transport distances of lithium ion and electrons. However, designing and synthesizing LVP nanocrystals (NCs) with sizes smaller than 30nm remains a challenge. In this work, we developed a facile approach for the fabrication of the monodisperse LVP NCs through a robust high-temperature organic-phase method. The thermodynamics of the synthesis and the possible reaction mechanism were investigated. The results indicate that the organic-phase environment (at 320 degrees C) may not thermodynamically allow the crystallization of LVP. Nevertheless, oleic acid (OA) and oleylamine (OAm) are essential as capping agents to hinder the agglomeration and growth of the particles. Based on the thermodynamic need, calcination is essential to prepare LVP. The surface electronic conductivity of the LVP NCs was enhanced through a subsequent carbon-coating treatment. The optimum combination of reduction and carbon coating is very favorable for the kinetics of electron transfer and lithium ion diffusion. Therefore, the fabricated LVP@C NCs exhibit superior lithium storage properties with excellent rate capability (84 mA h g(-1) at a rate of 20C) and perfect cyclic stability (96.2% capacity retention after 200 cycles at 5C), demonstrating their potential application in high-performance lithium-ion batteries.
机译：粒度降低是由于锂离子和电子的运输距离较短而改善Li3V2（PO4）（3）（3）（LVP）的锂储存性能的有效策略。然而，设计和合成具有小于30nm的大小的LVP纳米晶体（NCS）仍然是挑战。在这项工作中，我们开发了一种通过稳健的高温有机相方法制造单分散LVP NC的容易方法。研究了合成的热力学和可能的反应机理。结果表明有机相环境（320℃）可能不会热力学允许LVP的结晶。然而，油酸（OA）和油胺（OAM）是封端剂，以阻止颗粒的聚集和生长。基于热力学需求，煅烧对于制备LVP至关重要。通过随后的碳涂层处理增强了LVP NC的表面电子电导率。还原和碳涂层的最佳组合对于电子转移和锂离子扩散的动力学非常有利。因此，制造的LVP @ C NCS具有优异的锂储存性能，具有优异的速率能力（84 mA Hg（-1），以20℃的速率），并且完美的循环稳定性（在5℃下的200次循环后96.2％的容量保留），展示了它们的潜力高性能锂离子电池的应用。

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  • 来源
    《RSC Advances》 |2018年第34期|共6页
  • 作者

    Zhang Cunliang; Liu Yanmei; Li Jian; Zhu Kai; Chen Zhe; Liao Shijun; Zhang Xinhe;

  • 作者单位

    Mcnair Technol Co Ltd Dongguan 523800 Peoples R China;

    Shangqiu Med Coll Shangqiu 476000 Peoples R China;

    Mcnair Technol Co Ltd Dongguan 523800 Peoples R China;

    Shangqiu Polytech Dept Automobile Engn Shangqiu 476000 Peoples R China;

    Shangqiu Polytech Dept Automobile Engn Shangqiu 476000 Peoples R China;

    South China Univ Technol Sch Chem &

    Chem Engn Guangzhou 510641 Guangdong Peoples R China;

    Mcnair Technol Co Ltd Dongguan 523800 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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