A New Synthetic Route for Preparing LiFePO[sub 4] with Enhanced Electrochemical Performance
- 1 January 2002
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 149 (7) , A886-A890
- https://doi.org/10.1149/1.1481716
Abstract
Nanocrystalline LiFePO4LiFePO4 was obtained by heating amorphous nanosized LiFePO4.LiFePO4. The amorphous material was obtained by lithiation of FePO4FePO4 synthesized by spontaneous precipitation from equimolar aqueous solutions of Fe(NH4)2(SO4)2⋅6H2OFe(NH4)2(SO4)2⋅6H2O and NH4H2PO4,NH4H2PO4, using hydrogen peroxide as the oxidizing agent. The materials were characterized by chemical analysis, thermogravimetric and differential thermal analysis, X-ray powder diffraction, and scanning electron microscopy. The Brunauer- Emmett-Teller method was used to evaluate the specific surface area. Nanocrystalline LiFePO4LiFePO4 showed very good electrochemical performance delivering about the full theoretical capacity (170 Ah kg−1)(170 Ah kg−1) when cycled at the C/10 rate. A capacity fade of about 0.25% per cycle affected the material upon cycling. © 2002 The Electrochemical Society. All rights reserved.Keywords
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