Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 11, Pages 3206-3210Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.11.033
Keywords
Microwave method; Exchange current density; Nanocrystalline; LiFePO4/C
Categories
Funding
- School Doctor Foundation of Zhengzhou University of Light Industry [000309]
- Natural Science Foundation of Education Bureau of Henan Province, China [2008A150026]
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The precursors of LiFePO4 were prepared by a sol-gel method using lithium acetate dihydrate, ferrous sulfate, phosphoric acid, citric acid and polyethylene glycol as raw materials, and then the carbon-modified nanocrystalline LiFePO4 (LiFePO4/C) cathode material was synthesized by a one-step microwave method with the domestic microwave oven. The effect of microwave time and carbon content on the performance of the resulting LiFePO4/C material was investigated. Structural characterization by X-ray diffraction and scanning electron microscopy proved that the olivine phase LiFePO4 was synthesized and the grain size of the samples was several hundred nanometers. Under the optimal conditions of microwave time and carbon content, the charge-discharge performance indicated that the nanosized LiFePO4/C had a high electrochemical capacity at 0.2 C (152 mAh g(-1)) and improved capacity retention; the exchange current density was 1.6977 mA cm(-2). Furthermore, the rate capability was improved effectively after LiFePO4 was modified with carbon, with 59 mAh g(-1) being obtained at 20 C. (c) 2008 Elsevier Ltd. All rights reserved.
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