化工学报 ›› 2015, Vol. 66 ›› Issue (5): 1989-1995.DOI: 10.11949/j.issn.0438-1157.20141179

• 材料化学工程与纳米技术 • 上一篇    下一篇

锂离子电池负极材料Li4Ti5O12/C的制备与表征

赵曦, 田艳红, 张学军, 陈永   

  1. 北京化工大学材料科学与工程学院, 北京 100029
  • 收稿日期:2014-08-05 修回日期:2015-02-19 出版日期:2015-05-05 发布日期:2015-05-05
  • 通讯作者: 田艳红

Preparation and characterization of Li4Ti5O12/C anode material for lithium ion batteries

ZHAO Xi, TIAN Yanhong, ZHANG Xuejun, CHEN Yong   

  1. School of Meterials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2014-08-05 Revised:2015-02-19 Online:2015-05-05 Published:2015-05-05

摘要: 针对Li4Ti5O12导电性和倍率性能差的缺陷,以PEG为碳源采用溶胶-凝胶法制备出电池负极材料Li4Ti5O12/C,考察不同分子量聚乙二醇PEG(400、600、1000)做碳源制备的Li4Ti5O12/C复合材料电化学性能的优劣,采用热重分析仪(TG)、X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、恒流充放电、倍率放电、交流阻抗(EIS)等方法对材料进行了结构表征和电化学性能测试。结果表明:以PEG1000为碳源时得到的Li4Ti5O12/C,0.1C下首次放电比容量为143.5 mA·h·g-1,2C的倍率下仍然保持了105 mA·h·g-1的比容量,容量保持率达到73.17%,并且此材料有最小的电阻,在大电流条件下有良好的电化学性能。

关键词: 电化学, 纳米粒子, 粉体, 锂离子电池, Li4Ti5O12, PEG, 溶胶-凝胶法

Abstract: In order to enhance electrical conductivity and rate capability of Li4Ti5O12, the Li4Ti5O12/C powder was prepared by the sol-gel method, using PEG as carbon source. The performance of Li4Ti5O12/C coated by three different molecular weight carbon sources: PEG (400, 600, and 1000), was investigated with TG, XRD, SEM, TEM, constant current charge-discharge, rate discharge and EIS. The material obtained by using PEG1000 as carbon source had the best electrochemical performance. Initial discharge capacity was 143.5 mA·h·g-1 at 0.1C rate, and discharge capacity remained 105 mA·h·g-1 at 2C rate, capacity retention ratio was 73.17%, in addition, it had the smallest resistance.

Key words: electrochemistry, nanoparticles, powders, lithium ion battery, Li4Ti5O12, PEG, sol-gel method

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