期刊
ELECTROCHIMICA ACTA
卷 50, 期 2-3, 页码 263-270出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2004.02.073
关键词
natural graphite; LiFePO4; Li-ion battery; gel electrolyte; polymer
The aging and performance of natural graphite/PEO-based gel electrolyte/LiFePO4 cells are reported. The gel polymer electrolytes were produced by electron-beam irradiation and then soaked in a liquid electrolyte. The natural graphite anode in gel electrolyte containing LiBF4-EC/GBL exhibited high reversible capacity (345 mAh/g) and high coulombic efficiency (91%). The LiFePO4 cathode in the same gel-polymer exhibited a reversible capacity of 160 mAh/g and 93% coulombic efficiency. Better performance was obtained at high-rate discharge with 6% carbon additive in the cathode, however the graphite anode performance suffers at high rate. The Li-ion gel polymer battery shows a capacity fade of 13% after 180 cycles and has poor performance at low temperature due to low diffusion of the lithium to the graphite in the GBL system. The LiFePO4/gel/Li system has an excellent rate capacity. LiFePO4 cathode material is suitable for HEV application. (C) 2004 Elsevier Ltd. All rights reserved.
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