Fe3+ and Ni3+ impurity distribution and electrochemical performance of LiCoO2 electrode materials for lithium ion batteries

被引：20

作者：

Alcantara, R. ^{[2
]}

Ortiz, G. ^{[2
]}

Tirado, J. L. ^{[2
]}

Stoyanova, R. ^{[1
,3
]}

Zhecheva, E. ^{[1
]}

Ivanova, Sv. ^{[1
]}

机构：

[1] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria

[2] Univ Cordoba, Fac Ciencias, Lab Quim Inorgan, Cordoba 14071, Spain

[3] CNRS, Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France

来源：

JOURNAL OF POWER SOURCES | 2009年 / 194卷 / 01期

关键词：

Lithium ion batteries; Cathode materials; Layered oxides; EPR spectroscopy; X-RAY-DIFFRACTION; LAYERED CRYSTAL-STRUCTURE; FE-57; MOSSBAUER; SURFACE MODIFICATION; NEUTRON-DIFFRACTION; CATHODE MATERIALS; PARAMAGNETIC-RESONANCE; CATIONIC DISTRIBUTION; LOCAL COORDINATION; SUBSTITUTED LICOO2;

D O I：

10.1016/j.jpowsour.2009.05.026

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The distribution of Fe3+ and Ni3+ impurities and the electrochemical performance of LiCoO2 electrodes were examined. Commercial LiCoO2 powders supplied by Aldrich were used. The electrochemical performance of LiCoO2 was modified by rotor blade grinding of LiCoO2 followed by thermal treatment. Structural information on Fe3+ and Ni3+ impurities was obtained using both conventional X-band and high-frequency electron paramagnetic resonance spectroscopy (EPR). It was found that Fe3+ occupies a Co-site having a higher extent of rhombic distortion, while Ni3+ is in a trigonally distorted site. After rotor blade grinding of LiCoO2, isolated Fe3+ ions display a tendency to form clusters, while isolated Ni3+ ions remain intact. Re-annealing of ground LiCoO2 at 850 degrees C leads to disappearance of iron clusters; isolated Fe3+ ions are recovered. The electrochemical performance of LiCoO2 was discussed on the basis of isolated and clustered ions. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：494 / 501

页数：8

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