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研究论文

锂离子电池正极材料 Li2CoxMn1-xSiO4的合成及电化学性能研究

  • 王琳 ,
  • 吕东平 ,
  • 杨勇
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  • 固体表面物理化学国家重点实验室,厦门大学化学与化工学院,化学系,
    福建 厦门  361005

收稿日期: 2011-03-07

  修回日期: 2011-03-15

  网络出版日期: 2011-06-09

基金资助

国家自然科学基金(基金号:20873115 )、国家重点基础研究发展规划973课题(2007CB209702)

Synthesis and Electrochemical Behaviors of Li2CoxMn1-xSiO4 as a Cathode Material for Lithium-Ion Batteries

  • WANG Lin ,
  • LV Dong-Ping ,
  • YANG Yong
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  • State  Key  Laboratory  for  Physical  Chemistry  of  Solid  Surfaces,  College  of Chemistry and Chemical Engineering, Department of Chemistry, Xiamen University, Xiamen, 361005 (P. R.China) 

Received date: 2011-03-07

  Revised date: 2011-03-15

  Online published: 2011-06-09

摘要

 采用水热辅助溶胶凝胶法及球磨包碳技术合成Li2CoxMn1-xSiO4(x=0、 0.1、0.3、0.5、1)与碳纳米管复合材料,X 射线衍射(XRD) 、扫描电镜(SEM)表征复合材料的结构与形貌。用循环伏安(CV) ,交流阻抗(EIS) ,充放电曲线测试材料的电化学性能,并与 Li2MnSiO4/C 和 Li2CoSiO4/C 进行对比。掺钴可以改善Li2MnSiO 4电极的倍率放电性能。

本文引用格式

王琳 , 吕东平 , 杨勇 . 锂离子电池正极材料 Li2CoxMn1-xSiO4的合成及电化学性能研究[J]. 电化学, 2011 , 17(3) : 318 -322 . DOI: 10.61558/2993-074X.2847

Abstract

We have successfully synthesized Li2CoxMn1-xSiO4/C (x=0, 0.1, 0.3, 0.5, 1)/C composites using hydrothermal assisted sol-gel process and ball-milling method. The results of X-ray diffraction show that the solid solutions of Li2CoxMn1-xSiO4 can be achieved when x≤0.3. The initial capacities increase from 70 mAhg-1??? of Li2MnSiO4/C to 105 mAhg-1??? of Li2Co0.3Mn0.7SiO4/C. Cyclic Voltammetry (CV) curves show that the replacement of Mn with Co can reduce the electrochemical polarization, making the insertion-extraction reaction of Li+ much easier. EIS results also prove that Co can decrease the charge transfer impedance of the materials.

参考文献

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