Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9760346 | Journal of Power Sources | 2005 | 6 Pages |
Abstract
The performance of natural graphite-fibers/PEO-based gel electrolyte/LiFePO4 cells (7 mAh, 4 cm2) is reported. The gel polymer electrolytes were produced by electron-beam irradiation and then soaked in a liquid electrolyte. The natural graphite-fiber composite anode in gel electrolyte containing 1.5 M LiFSI-EC/GBL (1:3) exhibited high reversible capacity (361 mAh gâ1) and high Coulombic efficiency (92%). The LiFePO4 cathode in the same gel polymer exhibited a reversible capacity of 161 mAh gâ1 and 93% Coulombic efficiency. A 1.5 M solution of LiFSI in ethylene carbonate (EC)/γ-butyrolactone (GBL) (1:3, v/v) mixed solvent is advantageous for use as the electrolyte in the laminated film bag because of its high flame point (135 °C), high boiling point (219 °C), low vapor pressure and high conductivity (10.2 mS cmâ1 at 20 °C). The Li-ion gel polymer battery shows a very low capacity fade of 5% after 500 cycles and also has high-rate capability. The Li-ion gel polymer cell using LiFePO4 cathodes is suitable for HEV applications.
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Authors
K. Zaghib, P. Charest, A. Guerfi, J. Shim, M. Perrier, K. Striebel,