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

doi:10.61558/2993-074X.1852

电化学 >

2008 , Vol. 14 >Issue 1: 1 - 5

DOI: https://doi.org/10.61558/2993-074X.1852

研究论文

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

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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

网络出版日期: 2008-02-28

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Cu Doping LiFePO_4 and its Electrochemical Performance

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

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(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 date: 2008-02-28

Revised date: 2008-02-28

Online published: 2008-02-28

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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

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郑明森 , 刘善科 , 孙世刚 , 董全峰 . Cu~(2+)掺杂LiFePO_4的制备及其电化学性能[J]. 电化学, 2008 , 14(1) : 1 -5 . DOI: 10.61558/2993-074X.1852

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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