Issue 18, 2011
From the journal:

Journal of Materials Chemistry

LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4 cathodes with improved lithium storage properties

I. C. Jang,a   C. G. Son,a   S. M. G. Yang,a   J. W. Lee,a   A. R. Cho,a   V. Aravindan,ab   G. J. Park,c   K. S. Kang,d   W. S. Kim,e   W. I. Chof  and  Y. S. Lee*a  

* Corresponding authors

a Faculty of Applied Chemical Engineering, Chonnam National University, Gwang-ju, Korea
E-mail: leeys@chonnam.ac.kr
Fax: +82 62 530 1909
Tel: +82 62 530 1904

b Energy Research Institute, Nanyang Technological University, Research Techno Plaza, 50 Nanyang Drive, Singapore, Singapore

c Department of Applied Chemistry, Saga University, Saga 840-8502, Japan

d Department of Materials Science and Engineering, Seoul National University, Seoul, Korea

e Daejung EM co. Ltd, Incheon, Korea

f Energy and Environment Division, Korea Institute of Science and Technology, Seoul, Korea

Abstract

LiCoPO4 and Li1.02(Co0.9Fe0.1)0.98PO4 were prepared by conventional solid state reactions. The surface modification of Li1.02(Co0.9Fe0.1)0.98PO4 particulates by LiFePO4 was successfully carried out by a dry coating procedure. TEM analysis confirmed the presence of a LiFePO4 coating layer of about 20 nm on the surface of the Li1.02(Co0.9Fe0.1)0.98PO4 particles. All three cells delivered high initial discharge capacities of 122, 130 and 128 mA h g−1 for LiCoPO4, Li1.02(Co0.9Fe0.1)0.98PO4, and LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4, respectively. However, these cells presented quite different cycle retention rates after 20 cycles, 21, 22 and 70% for LiCoPO4, Li1.02(Co0.9Fe0.1)0.98PO4, and LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4, respectively. The improved cycle retention of the LiFePO4-modified Li1.02(Co0.9Fe0.1)0.98PO4 resulted from its reduced reactivity towards the electrolyte and the effective prevention of resistive layer formation on the LiCoPO4 surface during high voltage cycling.

Graphical abstract: LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4 cathodes with improved lithium storage properties

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Article information

DOI
https://doi.org/10.1039/C1JM10574D
Article type
Communication
Submitted
08 Feb 2011
Accepted
17 Mar 2011
First published
30 Mar 2011

J. Mater. Chem., 2011,21, 6510-6514

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LiFePO4 modified Li1.02(Co0.9Fe0.1)0.98PO4 cathodes with improved lithium storage properties

I. C. Jang, C. G. Son, S. M. G. Yang, J. W. Lee, A. R. Cho, V. Aravindan, G. J. Park, K. S. Kang, W. S. Kim, W. I. Cho and Y. S. Lee, J. Mater. Chem., 2011, 21, 6510 DOI: 10.1039/C1JM10574D

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