物理化学学报 >> 2011, Vol. 27 >> Issue (09): 2118-2122.doi: 10.3866/PKU.WHXB20110841

电化学和新能源 上一篇    下一篇

水热法合成高功率锂离子二次电池用球形Li4Ti5O12负极材料

闫慧, 张欢, 张鼎, 朱智, 其鲁   

  1. 北京大学化学与分子工程学院, 应用化学系, 新能源材料与技术实验室, 北京分子科学国家实验室, 北京 100871
  • 收稿日期:2011-03-28 修回日期:2011-05-17 发布日期:2011-08-26
  • 通讯作者: 其鲁 E-mail:qilu@pku.edu.cn
  • 基金资助:

    国家高技术研究发展计划项目(863) (2008AA11A102)资助

Hydrothermal Synthesis of Spherical Li4Ti5O12 as Anode Material for High Power Lithium-Ion Secondary Battery

YAN Hui, ZHANG Huan, ZHANG Ding, ZHU Zhi, QI Lu   

  1. Beijing National Laboratory for Molecular Sciences, New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2011-03-28 Revised:2011-05-17 Published:2011-08-26
  • Contact: QI Lu E-mail:qilu@pku.edu.cn
  • Supported by:

    The project was supported by the National High Technology Research and Development Program of China (863) (2008AA11A102).

摘要: 以球形TiO2和LiOH溶液为反应物, 通过水热法合成了尖晶石型Li4Ti5O12, 并使用X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱、扫描电镜(SEM)和激光粒度分布(PSD)对其结构、形貌和电化学性能进行了表征. 结果表明: 通过该法得到的产品颗粒大小均匀, 粒度分布狭窄, 结构与标准Li4Ti5O12谱图一致. 实验选定温度下所得的Li4Ti5O12均表现出良好的电化学性能. 其中, 800 °C热处理所得样品的电化学性能最好, 室温下, 以35mA·g-1的电流密度进行充放电, 其可逆容量达到162 mAh·g-1, 同时这种材料也表现出良好的倍率性能, 即使在720 mA·g-1的电流密度条件下进行充放电, 其可逆容量仍可达到124 mAh·g-1.

关键词: 水热法合成, 球形, Li4Ti5O12, 电化学性能, 锂离子二次电池

Abstract: Pure spinel-type lithium titanate, Li4Ti5O12, was successfully fabricated by a facile hydrothermal route using anatase TiO2 and LiOH solution as raw materials. The obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and laser particle size distribution (PSD) analysis. The results showed that a spherical well-crystallized Li4Ti5O12 oxide was obtained at a calcination temperature of 800 °C. The optimal Li4Ti5O12 also has excellent electrochemical performance, which reached 162 mAh·g-1 at a current density of 35 mA· g-1 and a good rate capability with a capacity reached 124 mAh·g-1 even at a current density of 720 mA·g-1.

Key words: Hydrothermal synthesis, Spherical, Li4Ti5O12, Electrochemical performance, Lithium-ion secondary battery

MSC2000: 

  • O646