A study on the electrochemical characteristics of LiFePO sub(4 cathode for lithium polymer batteries by hydrothermal method)

Phospho-olivine LiFePO sub(4 cathode materials were prepared by hydrothermal reaction at 150 [deg]C. Carbon black was added to enhance the electrical conductivity of LiFePO) sub(4). LiFePO sub(4-C powders (0, 3, 5 and 10 wt.%) were characterized by X-ray diffraction (XRD) and transmission electron m...

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Bibliographic Details
Published in:Journal of power sources 2008-04, Vol.178 (2), p.801-806
Main Authors: Jin, En Mei, Jin, Bo, Jun, Dae-Kyoo, Park, Kyung-Hee, Gu, Hal-Bon, Kim, Ki-Won
Format: Article
Language:English
Subjects:
Carbon black
Cathodes
Charge
Current density
Discharge
Electrolytic cells
Lithium
Resistivity
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Summary:Phospho-olivine LiFePO sub(4 cathode materials were prepared by hydrothermal reaction at 150 [deg]C. Carbon black was added to enhance the electrical conductivity of LiFePO) sub(4). LiFePO sub(4-C powders (0, 3, 5 and 10 wt.%) were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). LiFePO) sub(4)-C/solid polymer electrolyte (SPE)/Li cells were characterized electrochemically by charge/discharge experiments at a constant current density of 0.1 mA cm[super]-2 in a range between 2.5 and 4.3 V vs. Li/Li[super]+, cyclic voltammetry (CV) and ac impedance spectroscopy. The results showed that initial discharge capacity of LiFePO sub(4 was 104 mAh g[super]-1. The discharge capacity of LiFePO) sub(4)-C/SPE/Li cell with 5 wt.% carbon black was 128 mAh g[super]-1 at the first cycle and 127 mAh g[super]-1 after 30 cycles, respectively. It was demonstrated that cycling performance of LiFePO sub(4-C/SPE/Li cells was better than that of LiFePO) sub(4)/SPE/Li cells.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2007.09.073