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2010 , Vol. 25 >Issue 5: 480 - 484

DOI: https://doi.org/10.3724/SP.J.1077.2010.00480

研究论文

碳芯结构LiFePO4/C复合材料的表征及电化学性能

  • 陈 晗 ,
  • 龚文强 ,
  • 刘友良 ,
  • 刘建华
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  • 湖南工业大学 冶金工程学院, 株洲 412000

收稿日期: 2009-08-01

  修回日期: 2009-12-01

  网络出版日期: 2010-05-12

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Characterization and Electrochemical Properties of LiFePO4/C Composite with Carbon Core Structure

  • CHEN Han ,
  • GONG Wen-Jiang ,
  • LIU You-Liang ,
  • LIU Jian-Hua
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  • College of Metallurgy Engineering, Hunan University of Technology, Zhuzhou 412000, China

Received date: 2009-08-01

  Revised date: 2009-12-01

  Online published: 2010-05-12

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摘要

采用环氧树脂为碳源制备出碳芯结构LiFePO4/C复合材料. 利用X射线衍射、扫描电镜、透射电镜和X光电子能谱等分别对复合材料的晶体结构、表面形貌及表面成分进行表征, 采用恒电流充放电和电化学阻抗方法研究试样的电化学性能. 实验结果表明：碳芯结构复合材料是由无定形碳线和纳米LiFePO4颗粒组成. 碳芯结构LiFePO4/C复合材料在15mA/g的电流密度下, 首次放电容量达到166mAh/g, 当电流密度增加到750mA/g, 放电容量高达131mAh/g, 经过50次循环后, 容量保持率高达99.2%.

关键词：  LiFePO4; 复合材料; 碳芯结构; 电化学性能

本文引用格式

陈 晗 , 龚文强 , 刘友良 , 刘建华 . 碳芯结构LiFePO4/C复合材料的表征及电化学性能[J]. 无机材料学报, 2010 , 25(5) : 480 -484 . DOI: 10.3724/SP.J.1077.2010.00480

Abstract

LiFePO4/C composite with carbon core structure was successfully synthesized by using epoxy resin as carbon source. The microstructure, morphology, surface composition of LiFePO4/C composite were characterized by Xray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscope (XPS). Their electrochemical properties were investigated in terms of galvanostatic chargedischarge and electrochemical impedance spectroscope (EIS) tests. The experimental results show that LiFePO4/C composite with carbon core structure is composed of amorphous carbon line core and nanometer LiFePO4 grains. The initial discharge capacity of LiFePO4/C composite is 166mAh/g at current density of 15mA/g. Its initial discharge capacity is 131mAh/g with capacity retention of 99.2% after 50 cycles at current density of 750mA/g.

Key words： LiFePO4; composite; carbon core structure; electrochemical properties LiFePO4

参考文献

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