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The effects of structural properties on the lithium storage behavior of mesoporous TiO2

机译：结构性质对介孔TiO2锂储存行为的影响

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摘要

Understanding the effects of structural properties on the lithium storage behavior of mesoporous TiO2 is crucial for further optimizing its performance through rational structure design. To achieve this, herein, the surface area and the grain size of the prepared mesoporous TiO2 are intentionally adjusted by controlling the calcination temperatures. It is found that the capacities of the mesoporous TiO2 contain both the lithium-ion insertion into the bulk phase (Q(in)) and the additional surface lithium storage (Q(as)). The Q(in) gradually increases with grain sizes to a steady level and then slightly drops. By contrast, the Q(as) is directly proportional to the specific surface area of the mesoporous TiO2 and is ascribed to the capacity originated from the lithium-ion insertion into the surface layer. The experimental comparison and analysis demonstrate that the fast kinetics of the Q(as) ensure both the better rate performance and capacity retention of mesoporous TiO2 than bulk ones. Specially, the mesoporous TiO2 calcinated at 350 degrees C shows the highest reversible specific capacity of 250.2 mA h g(-1), the best rate capability (132.5 mA h g(-1) at 2C) and good cycling stability. Our findings shed great light on the design of high-performance nanostructured TiO2 with surface lithium storage.
机译：了解结构性质对介孔TiO2的锂储存行为的影响对于进一步优化其通过合理结构设计的性能至关重要。为了实现这一点，在本文中，通过控制煅烧温度有意调节制备的中孔TiO2的表面积和晶粒尺寸。发现介孔TiO 2的容量含有锂离子插入到体相（Q（In））和附加表面锂储存（Q（AS））中。 Q（IN）随粒度逐渐增加，达到稳定水平，然后略微下降。相反，Q（AS）与介孔TiO 2的比表面积成比例，并且归因于源自锂离子插入到表面层的容量。实验比较和分析表明，Q的快速动力学（AS）确保了介孔TiO2的更好的速率性能和容量保留而不是散装。特别地，在350℃下煅烧的中孔TiO2显示出最高可逆的特定容量为250.2 mA H（-1），最佳速率能力（2℃的132.5 mA H（-1））和良好的循环稳定性。我们的研究结果揭示了具有表面锂储存的高性能纳米结构TiO2的设计。

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  • 来源
    《Nanotechnology》 |2017年第26期|共11页
  • 作者

    Xiao Liang; Meng Wen; Wang Shiyao; Liu Dan; Qu Deyu; Xie Zhizhong; Deng Bohua; Liu Jinping;

  • 作者单位

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

    Wuhan Univ Technol Sch Chem Chem Engn &

    Life Sci Wuhan 430070 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    mesoporous TiO2; surface lithium storage; structure-performance relationship; lithium-ion battery;

    机译：中孔TiO2;表面锂储存;结构性能关系;锂离子电池;

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