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20054937

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A facile chemical polymerization method was applied to prepare LiFePO4/C-PPy composite using
Fe(III)tosylate as oxidant. The as-prepared LiFePO4/C-PPy sample with PPy content of approximately
4 wt% showed great rate capability with a discharge capacity of 115 mAh/g at 20C. High temperate
cycling performance of the LiFePO4/C-PPy sample was compared with bare LiFePO4/C at 5C charge¨Cdischarge
rate at 55 C. The LiFePO4/C-PPy cathode showed superior cycling stability with an initial capacity
of 155 mAh/g. Ninety percentage of this initial capacity was retained after 300 cycles, compared to 40% of
that of bare LiFePO4/C. The LiFePO4/C-PPy electrode showed stable discharge plateau voltage of 3.35¨C
3.25 V vs. Li+/Li during long term cycling. The superior performance of the LiFePO4/C-PPy electrode
was due to the enhanced electrical conductivity, negligible iron dissolution and alleviated electrode
cracking contributed by PPy coating.
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hzh19860327

½ð³æ (СÓÐÃûÆø)

20054937(½ð±Ò+100, ·­ÒëEPI+1):лл 2010-04-20 11:19
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