journal6 ›› 2010, Vol. 31 ›› Issue (5): 85-88.

• 化学化工 • 上一篇    下一篇

锂离子电池正极材料LiMn2O4/Ag的合成及表征

  

  1. (湖南省林产化工工程重点实验室,湖南 张家界 427000)
  • 出版日期:2010-09-25 发布日期:2012-04-12
  • 作者简介:肖卓炳(1961-),男,湖南省林产化工工程重点实验室教授,主要从事材料科学研究.
  • 基金资助:

    湖南省科技厅科学研究项目(2009FJ3045);湖南省教育厅科学研究项目(08C670)

Synthesis and Characterization of LiMn2O4/Ag Composite for Lithium Ion Battery

  1. (Key Laboratoryof Forest Products and Chemical Indusary Engineering,Zhangjiajie 427000,Hunan China)
  • Online:2010-09-25 Published:2012-04-12

摘要:以醋酸锂、醋酸锰和硝酸银为原料,采用柠檬酸络合燃烧法制备LiMn2O4/Ag复合材料.通过X射线衍射、扫描电子显微镜、恒电流充放电以及交流阻抗技术分析和检测合成产物的物相、形貌及电化学性能.结果表明:LiMn2O4/Ag复合材料由LiMn2O4和金属Ag组成,银均匀地分布在LiMn2O4颗粒中;与LiMn2O4相比,LiMn2O4/Ag复合材料具有更高的比容量、更高的库伦效率和更低的极化;Ag的添加可提高LiMn2O4的循环性能,尤其是高倍率充放电循环性能.

关键词: 煅烧, 复合材料, 阻抗, 电池

Abstract: The powder of LiMn2O4/Ag composite was prepared by citrate gel and combustion technique using lithium acetate,manganese acetate and silver nitrate as starting materials.Phase identification,surface morphology and electrochemical properties were studied by X-ray diffraction,scanning electron microscopy,galvanostatic charge-discharge experiments,and electrochemical impedance spectroscopy.The results show that the powder is the composite of LiMn2O4 and Ag metal,and silver disperses homogeneously in LiMn2O4 particles.Compared with LiMn2O4,LiMn2O4/Ag composite has higher specific capacity,higher columbic efficiency and lower polarization.The additive of Ag improves the cycle ability of LiMn2O4 powders,especially at higher charge-discharge rate.

Key words: calcination, composite, impedance, batteries

公众号 电子书橱 超星期刊 手机浏览 在线QQ