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A pile of wood

机译:一堆木头

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On a list of cutting-edge materials for high-tech applications, you might not expect to see wood near the top. But an experiment by Teng Li and Liangbing Hu of the University of Maryland may soon put it there. For Dr Li and Dr Hu, writing in Nano Letters, have just described how wood might be used to make one class of batteries cheaper by permitting the lithium now employed in them to be replaced with sodium. As any high-school chemist knows, lithium and sodium are chemically similar. Sodium ions (sodium atoms with an electron missing, which makes them positively charged) are, however, five times the size of lithium ions. That matters because a battery works by shuttling ions between its anode and its cathode. The bigger the ion, the more damage this shuttling causes-and the shorter, in consequence, is the battery's life. Hitherto, that has ruled sodium out as a plausible ingredient of batteries. But engineers would still like to devise a commercially viable sodium battery, because sodium is much more abundant than lithium.
机译:在高科技应用的最先进材料清单上,您可能不会期望木材靠近顶部。但是,马里兰大学的滕力和胡良兵进行的实验可能很快就会付诸实践。对于李博士和胡博士,在《纳米快报》(Nano Letters)上写的文章中,描述了如何通过允许现在用的锂取代钠来使一类电池更便宜的木材。任何高中化学家都知道,锂和钠在化学上相似。但是,钠离子(缺少电子的钠原子使它们带正电)的体积是锂离子的五倍。这很重要,因为电池通过在阳极和阴极之间穿梭离子来工作。离子越大,这种穿梭造成的损害就越大,结果,电池的使用寿命也越短。迄今为止,这已经排除了钠作为电池合理成分的可能性。但是工程师仍然希望设计一种商业上可行的钠电池,因为钠比锂丰富得多。

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    《The economist》 |2013年第8843期|76-76|共1页
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