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前段时间忙于考试，现在终于结束了。作为实习版主，一直没有给大家带来什么很好的东西。此贴意在和大家共同发探讨一些电化学中的问题。期待大家了 Article abstract -------------------------------------------------------------------------------- Nature Materials 9, 68 - 74 (2009) Published online: 29 November 2009 | doi:10.1038/nmat2590 Subject Category: Materials for energy A 3.6 V lithium-based fluorosulphate insertion positive electrode for lithium-ion batteries N. Recham1, J-N. Chotard1, L. Dupont1, C. Delacourt1, W. Walker1,2, M. Armand1 & J-M. Tarascon1,2 -------------------------------------------------------------------------------- AbstractLi-ion batteries have contributed to the commercial success of portable electronics, and are now in a position to influence higher-volume applications such as plug-in hybrid electric vehicles. Most commercial Li-ion batteries use positive electrodes based on lithium cobalt oxides. Despite showing a lower voltage than cobalt-based systems (3.45 V versus 4 V) and a lower energy density, LiFePO4 has emerged as a promising contender owing to the cost sensitivity of higher-volume markets. LiFePO4 also shows intrinsically low ionic and electronic transport, necessitating nanosizing and/or carbon coating. Clearly, there is a need for inexpensive materials with higher energy densities. Although this could in principle be achieved by introducing fluorine and by replacing phosphate groups with more electron-withdrawing sulphate groups, this avenue has remained unexplored. Herein, we synthesize and show promising electrode performance for LiFeSO4F. This material shows a slightly higher voltage (3.6 V versus Li) than LiFePO4 and suppresses the need for nanosizing or carbon coating while sharing the same cost advantage. This work not only provides a positive-electrode contender to rival LiFePO4, but also suggests that broad classes of fluoro-oxyanion materials could be discovered. [ Last edited by hejin04c on 2010-1-5 at 09:11 ] |
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2楼2010-01-05 08:56:47
hotmail45
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3楼2010-01-05 08:57:34
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4楼2010-01-05 11:32:14
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呵呵，英雄所见略同呀。 前不久推荐了这篇文章 http://muchong.com/bbs/viewthread.php?tid=1756211&fpage=0&view=&highlight=&page=1 |
5楼2010-01-05 11:38:54
hejin04c
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