Structural and Electrochemical Properties of Doped LiFe0.48Mn0.48 Mg0.04PO4 as Cathode Material for Lithium ion Batteries

被引：29

作者：

Jang, Donghyuk ^{[1
]}

Palanisamy, Kowsalya ^{[1
]}

Kim, Yunok ^{[1
]}

Yoon, Won-Sub ^{[1
]}

机构：

[1] Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea

来源：

JOURNAL OF ELECTROCHEMICAL SCIENCE AND TECHNOLOGY | 2013年 / 4卷 / 03期

关键词：

Lithium ion battery; Olivine structure; LiFe0.48Mn0.48Mg0.04PO4; material; Cation doping; Rietveld Analysis; CATION SUBSTITUTION; PHOSPHO-OLIVINES; MG; DIFFRACTION; PERFORMANCE; CRYSTAL; FE;

D O I：

10.5229/JECST.2013.4.3.102

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical properties of Mg-doped LiFe0.48Mn0.48Mg0.04PO4 and pure LiFe0.5Mn0.5PO4 olivine cathodes are examined and the lattice parameters are refined by Rietveld analysis. The calculated atomic parameters from the refinement show that Mg2+ doping has a significant effect in the olivine LiFeMnPO4 structure. The unit cell volume is 297.053(2) angstrom(3) for pure LiFe0.5Mn0.5PO4 and is decreased to 296.177(1) angstrom(3) for Mg-doped LiFe0.48Mn0.48Mg0.04PO4 sample. The doping of Mg2+ cation with atomic radius smaller than Mn2+ and Fe2+ ion induces longer Li-O bond length in LiO6 octahedra of the olivine structure. The larger interstitial sites in LiO6 octahedra facilitate the lithium ion migration and also enhance the diffusion kinetics of olivine cathode material. The LiFe0.48Mn0.48Mg0.04PO4 sample with larger Li-O bond length delivers higher discharge capacities and also notably increases the rate capability of the electrode.

引用

页码：102 / 107

页数：6

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