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20054937铁杆木虫 (著名写手)
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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–discharge 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– 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
金虫 (小有名气)
- 翻译EPI: 1
- 应助: 0 (幼儿园)
- 金币: 883.7
- 帖子: 90
- 在线: 22.7小时
- 虫号: 991891
- 注册: 2010-04-08
- 专业: 有机高分子功能材料
20054937(金币+100, 翻译EPI+1):谢谢 2010-04-20 11:19
| 以对苯磺酸铁（Ⅲ）为氧化剂，通过简便的化学聚合方法制备LiFePO4/C-PPy复合材料。聚吡咯含量为4％的LiFePO4/C-Ppy在20° C时具有较大放电容量（115 mAh/g）。在55 ° C，5C倍率充放电量时， LiFePO4/C-Ppy有比LiFePO4/C更稳定的循环性能。LiFePO4/C-PPy阴极的电容量为1155 mAh/g，并表现出优良的循环稳定性能。LiFePO4/C-PPy在经过300个循环周期后LiFePO4/C-PPy保留了90%的初始电容量，而LiFePO4/C只保留了40%。与Li+/ Li电极相比，LiFePO4/C-Ppy电极在长时间的循环中表现出更加稳定的放电平台电压，其电压变化范围在3.35-3.25 v之间。LiFePO4/C-PPy具有优越电极性能，是由于 PPy 涂层增强了电极的导电性，减少了铁离子的溶解同时又减轻乐涂层开裂这种现象。 |
2楼2010-04-20 11:18:40