A study on the electrochemical characteristics of LiFePO4 cathode for lithium polymer batteries by hydrothermal method |
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| Authors: | En Mei Jin Bo Jin Dae-Kyoo Jun Kyung-Hee Park Hal-Bon Gu Ki-Won Kim |
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| Affiliation: | 1. Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, South Korea;2. College of Materials Science and Engineering, Jilin University, 130025 Changchun, China;3. ITRC for Energy Storage and Conversion, Gyeongsang National University, 660-701 Jinju, South Korea |
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| Abstract: | Phospho-olivine LiFePO4 cathode materials were prepared by hydrothermal reaction at 150 °C. Carbon black was added to enhance the electrical conductivity of LiFePO4. LiFePO4-C powders (0, 3, 5 and 10 wt.%) were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). LiFePO4-C/solid polymer electrolyte (SPE)/Li cells were characterized electrochemically by charge/discharge experiments at a constant current density of 0.1 mA cm−2 in a range between 2.5 and 4.3 V vs. Li/Li+, cyclic voltammetry (CV) and ac impedance spectroscopy. The results showed that initial discharge capacity of LiFePO4 was 104 mAh g−1. The discharge capacity of LiFePO4-C/SPE/Li cell with 5 wt.% carbon black was 128 mAh g−1 at the first cycle and 127 mAh g−1 after 30 cycles, respectively. It was demonstrated that cycling performance of LiFePO4-C/SPE/Li cells was better than that of LiFePO4/SPE/Li cells. |
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| Keywords: | LiFePO4 Carbon black Hydrothermal method Solid polymer electrolyte |
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