Issue 6, 2012
From the journal:

Journal of Materials Chemistry

Low-cost LiFePO4 using Fe metal precursor

Donghan Kim,a   Jinsub Lim,a   Vinod Mathew,a   Bonil Koo,b   Younkee Paik,c   Docheon Ahn,d   Seung-Min Paeke  and  Jaekook Kim*a  

* Corresponding authors

a Department of Materials Science and Engineering, Chonnam National University, Gwangju, Korea
E-mail: jaekook@chonnam.ac.kr
Fax: +82-62-530-1699
Tel: +82-62-530-1703

b Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL, USA

c Daegu Center, Korea Basic Science Institute, Daegu, Korea

d Pohang Accelerator Laboratory, Pohang, Korea

e Department of Chemistry, Kyungpook National University, Daegu, Korea

Abstract

A nano-LiFePO4 possessing a plate-shaped morphology was synthesized by the solvothermal process using low-cost Fe metal powder as the starting precursor at a moderate temperature of around 230 °C under high pressure. Field-emission scanning electron microscopy (FE-SEM) images revealed the average thickness, length and width of the nanoplates to be 20, 100 and 100 nm respectively. The nanoplate-LiFePO4 delivered specific discharge capacities of 171 mA h g−1 with impressive cycle performance until 150 cycles and high rate capabilities as capacities of 125 mA h g−1 was achieved at elevated C-rates of 16 C. Field-emission transmission electron microscopy (FE-TEM) confirmed the growth of the nanoplates along the [010] and [101] crystallographic directions. Solid state 7Li magic angle spinning nuclear magnetic resonance study suggests progressive Li-ion intercalation/de-intercalation along a specific crystallographic direction and appears to support the domino-cascade model. Extended X-ray absorption fine structure spectroscopy (EXAFS) studies indicated a flexible LiFePO4 nanostructure due to the reconstruction of crystals' surface and thereby realize enhanced capacities. We believe that the strategy to adopt Fe-metal precursor in order to obtain such high performing nano-LiFePO4 is very promising for large-scale commercialization from a cost perspective.

Graphical abstract: Low-cost LiFePO4 using Fe metal precursor

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Article information

DOI
https://doi.org/10.1039/C2JM14499A
Article type
Paper
Submitted
10 Sep 2011
Accepted
01 Dec 2011
First published
20 Dec 2011

J. Mater. Chem., 2012,22, 2624-2631

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Low-cost LiFePO4 using Fe metal precursor

D. Kim, J. Lim, V. Mathew, B. Koo, Y. Paik, D. Ahn, S. Paek and J. Kim, J. Mater. Chem., 2012, 22, 2624 DOI: 10.1039/C2JM14499A

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