应用化学

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多级结构还原氧化石墨烯包覆的钴铁氧体的合成及电化学性能

张彬1,2,张一波1,杨向光1*   

  1. (1.中国科学院长春应用化学研究所绿色化学与过程实验室 长春 130022;2.中国科学院研究生院 北京 100049)
  • 收稿日期:2014-03-28 修回日期:2014-05-12 出版日期:2014-11-08 发布日期:2014-11-08
  • 通讯作者: 杨向光,研究员; Tel:0431-85262228; Fax:0431-85262687; E-mail:xgyang@ciac.ac.cn; 研究方向:环境催化,锂离子电池
  • 基金资助:
    吉林省科技厅资助项目(20116009)

Synthesis and Electrochemical Performance of Reduced Graphene Oxide Coated Cobalt Iron Oxide with Hierarchical Structure

ZHANG Bin1,2, ZHANG Yibo1, YANG Xiangguang1*   

  1. (1.Laboratory of Green Chemistry and Process,Changchun Institute of
    Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China)
  • Received:2014-03-28 Revised:2014-05-12 Published:2014-11-08 Online:2014-11-08
  • Contact: yang Xiangguang

摘要: 以水滑石为前驱体合成微米花/纳米片多级结构过渡金属复合氧化物CoFe2O4,一种高性能锂离子电池负极材料。 通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等技术手段对其进行结构表征,发现得到的复合氧化物为单一晶相,且具有多级结构。 电化学性能测试表明,得到的负极材料具有高比容量和倍率性能。 通过还原氧化石墨烯(rGO)对CoFe2O4进行表面包覆制备CoFe2O4/rGO,其循环稳定性得到大幅度提高。

关键词: 锂离子电池, 负极材料, 复合氧化物, 多级结构, 电化学性能

Abstract: Binary transition metal oxide CoFe2O4 as a high capacity anode material for lithium-ion batteries with the microflower/nanosheet hierarchical structure was synthesized by layered double hydrotalcite-like precursors. The CoFe2O4 and reduced graphene oxide(rGO)coated CoFe2O4(CoFe2O4/rGO) materials were characterized by powder X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) techniques. The electrochemical performances of the CoFe2O4 and CoFe2O4/rGO electrodes were examined in terms of cyclic voltammetry and discharge/charge profiles. The electrodes exhibit high capacity and rate capacity. Furthermore, the cyclic performance of CoFe2O4/rGO electrode is better than that of the CoFe2O4 electrode.

Key words: lithium-ion batteries, anode materials, binary metal oxides, hierarchicalstructure, electrochemical performance

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