Journal
JOURNAL OF POWER SOURCES
Volume 178, Issue 2, Pages 801-806Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2007.09.073
Keywords
LiFePO4; carbon black; hydrothermal method; solid polymer electrolyte
Funding
- National IT Industry Promotion Agency (NIPA), Republic of Korea [C1090-0801-0023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [핵06B1406] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Phospho-olivine LiFePO4 cathode materials were prepared by hydrothermal reaction at 150 degrees 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. (C) 2007 Elsevier B.V. All rights reserved.
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