物理化学学报 >> 2008, Vol. 24 >> Issue (06): 1002-1006.doi: 10.3866/PKU.WHXB20080615

研究论文 上一篇    下一篇

多孔炭模板法制备Li4Ti5O12及其嵌锂行为

苏岳锋; 吴锋; 臧戈; 包丽颖; 陈实   

  1. 北京理工大学化工与环境学院, 国家高技术绿色材料发展中心, 北京 100081
  • 收稿日期:2007-11-06 修回日期:2008-01-03 发布日期:2008-06-03
  • 通讯作者: 吴锋 E-mail:wufeng863@bit.edu.cn

Porous Carbon as Template for Synthesis of Li4Ti5O12 and Its Lithiation Performance

SU Yue-Feng; WU Feng; ZANG Ge; BAO Li-Ying; CHEN Shi   

  1. Laboratory of National Development Center of Hi-Tech Green Materials, School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, P. R. China
  • Received:2007-11-06 Revised:2008-01-03 Published:2008-06-03
  • Contact: WU Feng E-mail:wufeng863@bit.edu.cn

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摘要： 采用水合氧化钛溶胶为原料, 多孔炭为模板剂, 设计制备了一种新型准纳米晶锂钛复合氧化物, 并用SEM、XRD、恒流充放电及交流阻抗测试表征了材料的形貌、结构和电化学性能. 结果表明, 该氧化物晶粒尺寸约200 nm, 为典型的尖晶石Li4Ti5O12结构. 在0.5C(1C=0.2 mA·cm-2)电流条件下的首次嵌脱锂效率为99.8%, 嵌脱锂电位平坦, 可逆容量为117 mAh·g-1; 当电流从0.5C增至5C时, 其可逆嵌锂容量仍在100 mAh·g-1以上, 容量保持率大于86%, 倍率充放电性能优异. 交流阻抗测试结果表明, 模板剂多孔炭的应用使合成的尖晶石Li4Ti5O12具有更佳的导电性能, 且多孔特征明显.

关键词: 水合氧化钛, 多孔炭, Li4Ti5O12

Abstract: Using hydrated titanium oxide sol as raw material, porous carbon as template, a novel spinel Li4Ti5O12 was synthesized. SEM, XRD, galvanostatic charge-discharge test, and alternating current impedance test were used to characterize the appearance, structure, and electrochemical performance of the oxide. The results showed that the dimension of the crystal particle of the oxide was about 200 nm. At a 0.5C (1C=0.2 mA·cm-2) current condition, the first charge-discharge efficiency of the Li4Ti5O12 electrode was 99.8%, the lithium intercalation potential or the lithium extraction potential was quite flat, and it’s reversible capacity was 117 mAh·g-1. When the current increased from 0.5C to 5C, the reversible capacity of the oxide was still above 100 mAh·g-1, which was more than 86% of the initial capacity. The Li4Ti5O12 exhibited an excellent rate capability. A.C. impedance test proved that using porous carbon as template in synthesis process could make the spinel Li4Ti5O12 have good conductivity and obvious porous characteristic.

Key words: Hydrated titaniumoxide, Porous carbon, Li4Ti5O12

MSC2000: 

  • O646