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无机材料学报

无机材料学报 ›› 2010, Vol. 25 ›› Issue (5): 480-484.DOI: 10.3724/SP.J.1077.2010.00480 CSTR: 32189.14.SP.J.1077.2010.00480

• 研究论文 • 上一篇    下一篇

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   

  1. 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 出版日期:2010-05-20 网络出版日期:2010-05-12

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

 CHEN   Han, GONG  Wen-Qiang, LIU  You-Liang, LIU  Jian-Hua   

  1. College of Metallurgy Engineering, Hunan University of Technology, Zhuzhou 412000, China
  • Received:2009-08-01 Revised:2009-12-01 Published:2010-05-20 Online: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

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

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