高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (11): 2513.doi: 10.7503/cjcu20180328

• 物理化学 • 上一篇    下一篇

双功能仿生膜修饰改性Li4Ti5O12负极材料

杨书廷1,2,3, 李倩慧1, 范玉昌1, 王秋娴2,3, 杜婷1, 岳红云1,2,3()   

  1. 1. 河南师范大学化学化工学院, 新乡 453007
    2. 动力电源及关键材料国家地方联合实验室, 新乡 453007
    3. 河南电池研究院, 新乡 453007
  • 收稿日期:2018-04-28 出版日期:2018-11-10 发布日期:2018-09-29
  • 作者简介:联系人简介: 岳红云, 女, 博士, 副教授, 主要从事锂离子电池关键材料研究. E-mail: yuehongyun@foxmail.com
  • 基金资助:
    国家自然科学基金(批准号: U1504211)和河南省重点科技攻关项目(批准号: 172102210049)资助.

Li4Ti5O12 Modification by Bifunctional Bionic Membrane as Anode Materials for Lithium-ion Batteries

YANG Shuting1,2,3, LI Qianhui1, FAN Yuchang1, WANG Qiuxian2,3, DU Ting1, YUE Hongyun1,2,3,*()   

  1. 1. School of Chemistry and Chemical Engineering, Henan Normal University,Xinxiang 453007, China
    2. National and Local Joint Engineering Laboratory of Motive Power and Key Materials,Xinxiang 453007, China
    3. Henan Battery Research Institute, Xinxiang 453007, China
  • Received:2018-04-28 Online:2018-11-10 Published:2018-09-29
  • Contact: YUE Hongyun E-mail:yuehongyun@foxmail.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No. U1504211) and the Key Project of Science and Technology Department of Henan Province, China(No. 172102210049).

摘要:

采用简单有效的自聚合方法在Li4Ti5O12颗粒表面包覆兼具离子导电和电子导电双重功效的聚多巴胺(PDA)/导电碳黑Super P(SP)复合包覆层, 获得了电化学性能优异的锂离子电池负极材料. 利用X射线粉末衍射(XRD)、 扫面电子显微镜(SEM)、 透射电子显微镜(TEM)、 充放电循环曲线和循环伏安(CV)等方法对复合材料的形貌、 结构以及电化学性能进行表征. 结果表明, 当PDA包覆层的厚度为10 nm、 Super P的含量为3%(质量分数)时, 得到的包覆材料展示了优异的电化学性能: 0.2C倍率下初始放电容量为175 mA·h/g, 循环150周后, 可逆放电容量仍在160 mA·h/g以上.

关键词: Li4Ti5O12, 聚多巴胺, 自聚合, 负极, 锂离子电池

Abstract:

Anode material with excellent electrochemical properties was obtained by coating the polydopamine(PDA)/Super P(SP) layer with the dual effect of both ionic conduction and electronic conduction on the surface of Li4Ti5O12 particles. The morphology, structure and electrochemical properties of the composites were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(SEM), transmission electron microscopy(TEM), charge-discharge cycle curves, and cyclic voltammetry(CV). The results showed that when the thickness of the coating layer was controlled at about 10 nm and the content of Super P was 3%(mass fraction), the sample displayed an outstanding electrochemical performance: the initial discharge capacity is 175 mA·h/g at 0.2C and the reversible discharge capacity is still above 160 mA·h/g after 150 cycles.

Key words: Li4Ti5O12, Polydopamine, Self-polymerization, Anode, Lithium-ion battery

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