物理化学学报 >> 2010, Vol. 26 >> Issue (12): 3187-3192.doi: 10.3866/PKU.WHXB20101212

电化学 上一篇    下一篇

高倍率尖晶石型Li4Ti5Ol2/TiN 锂离子电池负极材料的合成及其电化学性能

周晓玲, 黄瑞安, 吴肇聪, 杨斌, 戴永年   

  1. 昆明理工大学冶金与能源工程学院, 真空冶金国家工程实验室, 昆明650093
  • 收稿日期:2010-06-25 修回日期:2010-09-02 发布日期:2010-12-01
  • 通讯作者: 黄瑞安 E-mail:rahuang2009@gmail.com
  • 基金资助:

    云南省自然科学基金(2009CD024)资助项目

Synthesis and Electrochemical Properties of High-Rate Spinel Li4Ti5Ol2/TiN Anode Material for Lithium-Ion Batteries

ZHOU Xiao-Ling, HUANG Rui-An, WU Zhao-Cong, YANG Bin, DAI Yong-Nian   

  1. National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China
  • Received:2010-06-25 Revised:2010-09-02 Published:2010-12-01
  • Contact: HUANG Rui-An E-mail:rahuang2009@gmail.com
  • Supported by:

    The project was supported by the Natural Science Foundation of Yunnan Province, China (2009CD024).

摘要:

以乙酰丙酮(ACAC)为螯合剂、聚乙二醇(PEG)为分散剂, 采用溶胶-凝胶法合成了尖晶石型Li4Ti5Ol2/TiN 材料. 考察了TiN 膜对尖晶石型Li4Ti5Ol2锂离子电池负极材料电化学性能的影响. 利用X射线光电子能谱(XPS)对Li4Ti5O12表面的TiN 膜进行了分析. X射线衍射(XRD)和扫描电子显微镜(SEM)分析表明, Li4Ti5Ol2/TiN材料为结晶良好的亚微米纯相尖晶石型钛酸锂. 电化学性能测试表明, 该材料的首次放电比容量为173.0mAh·g-1, 并且具有良好的循环性能, 以0.2C、1C、2C、5C 倍率放电进行测试, 10 次循环后比容量分别为170.6、147.6、135.6、111.0 mAh·g-1, 较之表面无TiN 膜的钛酸锂材料表现出更好的倍率特性. 循环伏安曲线(CV), 交流阻抗图谱(EIS)进一步论证了TiN 膜改善了尖晶石型Li4Ti5Ol2锂离子电池负极材料的电化学性能.

关键词: 锂离子电池, 尖晶石型钛酸锂, 氮化钛膜, 负极材料, 溶胶-凝胶法, 聚乙二醇

Abstract:

Spinel Li4Ti5Ol2/TiN was successfully prepared by sol-gel processing using acetylacetone (ACAC) as a chelating ligand and polyethylene glycol (PEG) as a dispersant. The effect of the TiN film on the electrochemical properties of spinel Li4Ti5Ol2 for lithium-ion batteries was studied. The Li4Ti5Ol2/TiN was analyzed by X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images showed that this anode material with the TiN film was pure spinel Li4Ti5Ol2 and was of sub-micron size. The initial specific discharge capacity of the Li4Ti5Ol2/TiN is 173.0 mAh·g-1. When tested at a rate of 0.2C, 1C, 2C, and 5C, it still retained a discharge capacity of 170.6, 147.6, 135.6, and 111.0 mAh·g-1, respectively, after 10 cycles, indicating that Li4Ti5Ol2/TiN had better high-rate performance than that without the TiN film. The positive effect of the TiN film on lithium-ion batteries was also demonstrated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).

Key words: Lithium-ion battery, Spinel Li4Ti5Ol2, TiN film, Anode material, Sol-gel processing, Polyethylene glycol

MSC2000: 

  • O646