Identification of surface impurities on LiFePO4 particles prepared by a hydrothermal process
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作者:
Dokko, K
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Tokyo Metropolitan Univ, Grad Sch Engn, Dept Appl Chem, Hachioji, Tokyo 1920397, JapanTokyo Metropolitan Univ, Grad Sch Engn, Dept Appl Chem, Hachioji, Tokyo 1920397, Japan
Dokko, K
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Shiraishi, K
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机构:Tokyo Metropolitan Univ, Grad Sch Engn, Dept Appl Chem, Hachioji, Tokyo 1920397, Japan
Shiraishi, K
Kanamura, K
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机构:Tokyo Metropolitan Univ, Grad Sch Engn, Dept Appl Chem, Hachioji, Tokyo 1920397, Japan
Kanamura, K
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[1] Tokyo Metropolitan Univ, Grad Sch Engn, Dept Appl Chem, Hachioji, Tokyo 1920397, Japan
[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan
LiFePO4 was synthesized by a hydrothermal process at 170 degrees C. The particle size of the LiFePO4 was 0.5 mu m. The hydrothermally synthesized LiFePO4 exhibited a discharge capacity of 65 mAh g(-1) at the potential of 3.5 V vs Li/Li+. Transmission electron microscopy revealed the formation of an amorphous layer on the LiFePO4 particle during the hydrothermal process. This amorphous layer was crystallized by a heat-treatment at 400 degrees C in an argon atmosphere. The alpha-Fe2O3 was generated on the particle surface during the annealing process. Two plateaus at 3.5 and 2.5 V were observed in discharge curve for the annealed LiFePO4. The plateau at 2.5 V was correlated with Li+-ion insertion into alpha-Fe2O3. Addition of ascorbic acid as a reducing agent to the precursor was useful in prohibiting the conversion of Fe2+ to Fe3+ during the hydrothermal process and the generation of alpha-Fe2O3 during the annealing process. It was found that a trace amount of carbonaceous material was formed on the LiFePO4 particle due to the decomposition of ascorbic acid. The hydrothermally synthesized LiFePO4 followed by annealing at 400 degrees C exhibited a discharge capacity of 150 mAh g(-1). (c) 2005 The Electrochemical Society.
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Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Hu, YQ
Doeff, MM
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机构:Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Doeff, MM
Kostecki, R
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机构:Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Kostecki, R
Fiñones, R
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机构:Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
机构:
Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Hu, YQ
Doeff, MM
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机构:Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Doeff, MM
Kostecki, R
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机构:Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Kostecki, R
Fiñones, R
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机构:Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA