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电化学(中英文) ›› 2012, Vol. 18 ›› Issue (2): 135-139.  doi: 10.61558/2993-074X.2893

• 化学电源近期研究专辑(武汉大学 杨汉西教授主编) • 上一篇    下一篇

碳包覆Na2Ti6O13纳米管的电化学性能研究

李国然, 孙帅, 高学平*   

  1. 南开大学 新能源材料化学研究所,天津 300071
  • 收稿日期:2011-11-24 修回日期:2011-12-26 出版日期:2012-04-28 发布日期:2012-01-15
  • 通讯作者: 高学平 E-mail:xpgao@nankai.edu.cn
  • 基金资助:

    国家973计划(No. 2009CB220100)和中央高校基本科研业务费专项资金资助

Electrochemical Performances of Carbon-coated Na2Ti6O13 Nanotubes

 LI  Guo-Ran, SUN  Shuai, GAO  Xue-Ping*   

  1. Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China
  • Received:2011-11-24 Revised:2011-12-26 Published:2012-04-28 Online:2012-01-15
  • Contact: GAO Xue-Ping E-mail:xpgao@nankai.edu.cn

摘要: 以金红石型TiO2和NaOH为原料,由水热反应制备Na2Ti6O13纳米管. 然后,在含有0.1 mol?L-1 NaOH的葡萄糖水溶液中反应4 h制得碳包覆的Na2Ti6O13纳米管. X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等分析表明,该碳包覆Na2Ti6O13纳米管外径约14 ~ 19 nm,内径约2 ~ 5 nm,长度为数百纳米,有一层厚度约为2 nm的碳层包覆在纳米管外壁. 以其作为锂离子电池负极材料,恒电流充放电测试表明,在50 mA?g-1电流密度下首周可逆容量达到161 mAh?g-1,循环100周后容量保持在147 mAh?g-1,相比于Na2Ti6O13纳米管,提高了20%以上. 电流密度升至1600 mA?g-1充放电,碳包覆Na2Ti6O13纳米管可逆容量仍有70 mAh?g-1左右,远高于Na2Ti6O13纳米管,表现出良好的倍率性能.

关键词: 锂离子电池, 负极材料, Na2Ti6O13纳米管, 碳包覆, 倍率性能

Abstract: With rutile TiO2 and NaOH as starting materials, the Na2Ti6O13 nanotubes were prepared by a hydrothermal reaction. The carbon-coated Na2Ti6O13 nanotubes were obtained by treating the Na2Ti6O13 nanotubes for 4 h in glucose aqueous solutions containing 0.1 mol?L-1 NaOH. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microcopy (TEM). The results showed that the dimensions of carbon-coated Na2Ti6O13 nanotubes were 14 ~ 19 nm of outer diameter, 2 ~ 5 nm of inner diameter, and several hundreds nanometers of length with a carbon layer of about 2 nm being coated on outer surface of the nanotubes. As an anode material for lithium ion battery, the carbon-coated Na2Ti6O13 nanotubes exhibited an excellent cycle performance and high rate discharge capability compared with the Na2Ti6O13 nanotubes. At 50 mA?g-1, the reversible capacities of the carbon-coated Na2Ti6O13 nanotubes were 161 mAh?g-1 in the initial cycle and 147 mAh?g-1 after 100 cycles. When the discharge-charge current density was 1600 mA?g-1, the reversible capacity of the carbon-coated Na2Ti6O13 nanotubes still reached 70 mAh?g-1,much higher than that of Na2Ti6O13 nanotubes.

Key words: Li-ion battery, anode material, Na2Ti6O13 nanotubes, carbon-coated, high-rate capability

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