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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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- ½ð±Ò: 883.7
- Ìû×Ó: 90
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- ³æºÅ: 991891
- ×¢²á: 2010-04-08
- רҵ: Óлú¸ß·Ö×Ó¹¦ÄܲÄÁÏ
20054937(½ð±Ò+100, ·ÒëEPI+1):лл 2010-04-20 11:19
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