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电化学(中英文) ›› 2008, Vol. 14 ›› Issue (1): 1-5.  doi: 10.61558/2993-074X.1852

• 研究论文 •    下一篇

Cu~(2+)掺杂LiFePO_4的制备及其电化学性能

郑明森;刘善科;孙世刚;董全峰;   

  1. 厦门大学固体表面物理化学国家重点实验室化学化工学院化学系,厦门大学固体表面物理化学国家重点实验室化学化工学院化学系,厦门大学固体表面物理化学国家重点实验室化学化工学院化学系,厦门大学固体表面物理化学国家重点实验室化学化工学院化学系 福建厦门361005,福建厦门361005,福建厦门361005,福建厦门361005
  • 收稿日期:2008-02-28 修回日期:2008-02-28 出版日期:2008-02-28 发布日期:2008-02-28

Cu Doping LiFePO_4 and its Electrochemical Performance

ZHENG Ming-sen,LIU Shan-ke,SUN Shi-gang,DONG Quan-feng   

  1. (State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China
  • Received:2008-02-28 Revised:2008-02-28 Published:2008-02-28 Online:2008-02-28

摘要: 应用固相反应法合成LiFePO4及掺杂Cu2+的LiFePO4,以XRD、XPS表征样品的结构及Fe存在的价态.发现掺杂少量的Cu2+未能改变LiFePO4材料的结构特征以及Fe2+的化学状态,但是Cu2+的掺杂使得LiFePO4材料的晶胞体积变小.充放电测试结果表明少量Cu2+的掺杂能显著地提高LiFePO4材料的大倍率输出能力,LiCu0.02Fe0.98PO4,其1C放电容量可达130 mAh/g以上,较掺杂前提高了20%左右.

关键词: 磷酸铁锂, 铜, 锂离子电池

Abstract: LiFePO4 and LiFePO4 doped with Cu2+ ions were synthesized by solid-state reactions.The structure of LiFePO4 and the Fe valence were analyzed by the XRD(X-ray diffraction) and XPS(X-ray photoelectron spectroscopy) respectively.The Cu doping position in LiFePO4 is discussed.It has found that the volume of LiFePO4 by doping Cu2+ ions is reduced.The minim Cu2+ ions doping does not almost change the binding energy of Fe2p1/2 in LiFePO4.According to the experiment results,we conclude that most of the Cu2+ ions substitute the Fe2+ ions in LiFePO4 when a small amount of Cu2+ ions doping is occurred.

Key words: LiFePO4, Cu, lithium ion battery

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