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2007 , Vol. 22 >Issue 4: 627 - 630

DOI: https://doi.org/10.3724/SP.J.1077.2007.00627

研究论文

镁离子掺杂对 LiFePO4/C电化学性能和结构的影响

  • 杨书廷 ,
  • 刘玉霞 ,
  • 尹艳红 ,
  • 王辉 ,
  • 崔成伟
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  • 1. 河南师范大学化学与环境科学学院, 新乡 453007; 2. 河南省新能源材料工程研究中心, 新乡 453007; 3. 新乡市中科科技有限公司, 新乡 453002

收稿日期: 2006-08-18

  修回日期: 2006-10-23

  网络出版日期: 2007-07-20

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Effects of Mg Ion Doping on the Electrochemical Performances and
Structure of LiFePO4 /C

  • YANG Shu-Ting ,
  • LIU Yu-Xia ,
  • YIN Yan-Hong ,
  • WANG Hui ,
  • CUI Cheng-Wei
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  • 1. College of Chemistry and Environmental Science, Henna Normal University, Xinxiang 453007, China; 2. Research Institute of New Energy & Material Engineering of Henan Province, Xinxiang 453007, China; 3. Zhongke Science & Technology CO. Ltd, Xinxiang 453002, China

Received date: 2006-08-18

  Revised date: 2006-10-23

  Online published: 2007-07-20

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摘要

以乳酸镁做为Mg2+的掺杂源和部分的碳源, 在惰性氛围下用模板-固相合成法合成了掺Mg2+的LiFePO4/C复合正极材料, 考察了Mg2+对于目标化合物电化学和物理性能的影响. 研究结果表明, 在C/3倍率下材料掺杂前后第二个循环的放电容量分别为140.5和159.9mAh/g, 循环20次后容量为140.4 和162.1mAh/g. 电化学交流阻抗表明, 掺杂后的材料阻抗Rct从180Ω 减小到120Ω. 掺杂后振实密度比掺杂前提高了0.229g·cm-3.

关键词： 乳酸镁; LiFePO4/C; 正极材料; 掺杂

本文引用格式

杨书廷 , 刘玉霞 , 尹艳红 , 王辉 , 崔成伟 . 镁离子掺杂对 LiFePO4/C电化学性能和结构的影响[J]. 无机材料学报, 2007 , 22(4) : 627 -630 . DOI: 10.3724/SP.J.1077.2007.00627

Abstract

Stoichiometric Mg doped LiFePO4/C cathode material was synthesized through a templatesolid state reaction in an inert atmosphere using magnesium lactate as dopant and part of carbon source. Effects of Mg2+ doping on the electrochemical and physical performances of the cathode materials were investigated. At 1/3C discharge rate, the secondly reversible specific capacity of the Mg-doped LiFePO4/C is nearly 20mAh/g higher than that of the undoped one. After 20 cycles, the capacity of the former is 162.1mAh/g, 22mAh/g higher than that of the latter. Impedance R ct of the Mg-doped material is 120Ω, while that of the undoped material is 180Ω. The tap density of Mg-doped material is
also improved by 0.229g·cm-3 compared with undoped material.

Key words： magnesium lactate; LiFePO4/C; cathode material; doping

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