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首页> 外文期刊>Journal of power sources >Facile synthesis and electrochemical characterization of porous and dense TiO_2nanospheres for lithium-ion battery applications
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Facile synthesis and electrochemical characterization of porous and dense TiO_2nanospheres for lithium-ion battery applications

机译：用于锂离子电池的多孔致密TiO_2纳米球的简便合成和电化学表征

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摘要

We present a two-step method to optimize the nanoporous characteristics of TiO_2 samples thus enabling a higher charge and discharge capacity and a larger rate capability compared to dense TiO_2 materials. We use a simple sol-gel process to fabricate spherical titanium glycolates precursors followed by subsequent hydrothermal or annealing treatments resulting, respectively, in highly porous or dense TiO_2 nanospheres. These processes enable control of the grain size, pore structure, and specific surface area of the TiO_2. The fabricated TiO_2 nanostructures have been subsequently used to assemble lithium-ion batteries. Galvanostatic discharge-charge tests indicate that the porous TiO_2 nanospheres possess high and stable reversible capacity of 229, 133, and 56mAhg~(-1) at 0.06, 0.6 and 6C, respectively; whereas the corresponding values for dense TiO_2 nanospheres are 217, 45, and ~1 mAhg~(-1). Such considerable improvement of the electrochemical activity is attributed to the porous TiO_2 nanostructures, and subsequent change in diffusion length, and enables the possibility to optimize the high rate capability in TiO_2-based lithium-ion batteries.
机译：我们提出了一种两步法来优化TiO_2样品的纳米孔特性，从而与致密TiO_2材料相比具有更高的充放电容量和更大的倍率能力。我们使用简单的溶胶-凝胶工艺来制造球形乙醇酸钛前体，然后进行随后的水热处理或退火处理，分别得到高度多孔或致密的TiO_2纳米球。这些过程使得能够控制TiO 2的晶粒尺寸，孔结构和比表面积。所制造的TiO_2纳米结构随后被用于组装锂离子电池。恒电流充放电试验表明，多孔TiO_2纳米球在0.06、0.6和6C下分别具有229、133和56mAhg〜（-1）的高且稳定的可逆容量。致密的TiO_2纳米球的对应值为217、45和〜1 mAhg〜（-1）。电化学活性的这种显着提高归因于多孔TiO_2纳米结构以及随后扩散长度的变化，并使得优化TiO_2基锂离子电池的高倍率能力成为可能。

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  • 来源
    《Journal of power sources》 |2011年第15期|p.6394-6399|共6页
  • 作者

    Hong-En Wang; Hua Cheng; Chaoping Liu; Xue Chen; Qinglai Jiang; Zhouguang Lu; Yang Yang Li; C.Y. Chung; Wenjun Zhang; Juan Antonio Zapien; Ludvik Martinu; Igor Bello;

  • 作者单位

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, College of Chemistry and Chemical Engineering, Central South University, Changsha, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, PR China;

    Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, PR China;

    College of Chemistry and Chemical Engineering, Central South University, Changsha, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, College of Chemistry and Chemical Engineering, Central South University, Changsha, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, On Leave from the Department of Engineering, Ecole Polytechnique, Montreal, Quebec, Canada;

    Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, PR China, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, PR 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

    titanium dioxide; nanosphere; lithium-ion battery; nanoporous material;

    机译：二氧化钛;纳米球锂离子电池;纳米多孔材料;

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