Characterization and Electrochemical Performance of ZnO Modified LiFePO4/C Cathode Materials for Lithium-ion Batteries

被引：0

作者：

刘树信 ^{[1
,2
]}

殷恒波 ^{[2
]}

王海滨 ^{[1
]}

何冀川 ^{[1
]}

王洪 ^{[1
]}

机构：

[1] School of Chemistry and Chemical Engineering,Mianyang Normal University

[2] School of Material Science and Engineering,Jiangsu University

来源：

Chinese Journal of Structural Chemistry | 2014年 / 33卷 / 03期

关键词：

LiFePO4; electrochemical performance; cathode materials; lithium-ion batteries; surface modification;

D O I：

10.14102/j.cnki.0254-5861.2014.03.005

中图分类号：

O646 [电化学、电解、磁化学]; TM912 [蓄电池];

学科分类号：

0808 ; 081704 ;

摘要：

To improve the electrical conductivity of LiFePO4 cathode materials, the ZnO modified LiFePO4/C cathode materials are synthesized by a two-step process including solid state synthesis method and precipitation method. The structures and compositions of ZnO modified LiFePO4/C cathode materials are characterized and analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive spectroscopy, which indicates that the existence of ZnO has little or no effect on the crystal structure, particles size and morphology of LiFePO4. The electrochemical performances are also characterized and analyzed with charge-discharge test, cyclic voltammetry and electrochemical impedance spectroscopy. The results show that the existence of ZnO improves the specific capability and lithium ion diffusion rate of LiFePO4 cathode materials and reduces the charge transfer resistance of cell, and the one with 3 wt% ZnO exhibits the best electrochemical performance.

引用

页码：353 / 360

页数：8

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