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首页> 外文期刊>Advanced energy materials >Amorphous Carbon Coated High Grain Boundary Density Dual Phase Li4Ti5O12-TiO2: A Nanocomposite Anode Material for Li-Ion Batteries
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Amorphous Carbon Coated High Grain Boundary Density Dual Phase Li4Ti5O12-TiO2: A Nanocomposite Anode Material for Li-Ion Batteries

机译：非晶碳包覆的高晶粒边界密度双相Li4Ti5O12-TiO2：用于锂离子电池的纳米复合负极材料

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摘要

This work introduces an effective, inexpensive, and large-scale production approach to the synthesis of a carbon coated, high grain boundary density, dual phase Li4Ti5O12-TiO2 nanocomposite anode material for use in rechargeable lithium-ion batteries. The microstructure and morphology of the Li4Ti5O12-TiO2-C product were characterized systematically. The Li4Ti5O12-TiO2-C nanocomposite electrode yielded good electrochemical performance in terms of high capacity (166 mAh g−1 at a current density of 0.5 C), good cycling stability, and excellent rate capability (110 mAh g−1 at a current density of 10 C up to 100 cycles). The likely contributing factors to the excellent electrochemical performance of the Li4Ti5O12-TiO2-C nanocomposite could be related to the improved morphology, including the presence of high grain boundary density among the nanoparticles, carbon layering on each nanocrystal, and grain boundary interface areas embedded in a carbon matrix, where electronic transport properties were tuned by interfacial design and by varying the spacing of interfaces down to the nanoscale regime, in which the grain boundary interface embedded carbon matrix can store electrolyte and allows more channels for the Li+ ion insertion/extraction reaction. This research suggests that carbon-coated dual phase Li4Ti5O12-TiO2 nanocomposites could be suitable for use as a high rate performance anode material for lithium-ion batteries.
机译：这项工作为合成可充电锂离子电池用碳涂覆的，高晶界密度的双相Li4Ti5O12-TiO2纳米复合阳极材料的合成引入了一种有效，廉价且大规模的生产方法。系统地表征了Li4Ti5O12-TiO2-C产物的微观结构和形貌。 Li4Ti5O12-TiO2-C纳米复合电极在高容量（电流密度为0.5 C时为166 mAh g-1），良好的循环稳定性和优异的倍率能力（电流密度为110 mAh g-1）方面具有良好的电化学性能10 C（最多100个循环）。 Li4Ti5O12-TiO2-C纳米复合材料优异的电化学性能的可能影响因素可能与改善的形态有关，包括纳米颗粒之间存在高的晶界密度，每个纳米晶体上的碳分层以及嵌入在其中的晶界界面区域碳基体，通过界面设计和通过改变界面间距直至纳米尺度来调节电子传输性能，其中嵌入晶界界面的碳基体可以存储电解质，并为Li +离子的插入/萃取反应提供更多通道。这项研究表明，碳包覆的双相Li4Ti5O12-TiO2纳米复合材料可能适合用作锂离子电池的高性能阳极材料。

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  • 来源
    《Advanced energy materials》 |2011年第2期|1-9|共9页
  • 作者

    Md. Mokhlesur Rahman; Jia-Zhao Wang; Mohd Faiz Hassan; David Wexler; Hua Kun Liu;

  • 作者单位

    Institute for Superconducting and Electronic Materials ARC Centre of Excellence for Electromaterials Science University of Wollongong NSW 2522 Australia;

    Institute for Superconducting and Electronic Materials ARC Centre of Excellence for Electromaterials Science University of Wollongong NSW 2522 Australia;

    Institute for Superconducting and Electronic Materials ARC Centre of Excellence for Electromaterials Science University of Wollongong NSW 2522 Australia;

    Institute for Superconducting and Electronic Materials ARC Centre of Excellence for Electromaterials Science University of Wollongong NSW 2522 Australia;

    School of Mechanical Materials and Mechatronic Engineering University of Wollongong NSW 2522 Australia;

    Institute for Superconducting and Electronic Materials ARC Centre of Excellence for Electromaterials Science University of Wollongong NSW 2522 Australia;

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  • 正文语种 eng
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  • 关键词

    molten salt; Li4Ti5O12-TiO2-C nanocomposites; interfacial design; grain boundary; lithium-ion batteries; electrode materials;

    机译：熔融盐Li4Ti5O12-TiO2-C纳米复合材料界面设计晶界锂离子电池电极材料;

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