In situ XRD and electrochemical study of the reaction of lithium with amorphous silicon
In situ XRD and electrochemical study of the reaction of lithium with amorphous silicon
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DOI：
10.1149/1.1739217
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发表时间：
2004-01-01
影响因子：
3.9
通讯作者：
Dahn, JR
中科院分区：
文献类型：
--
作者：
Hatchard, TD;Dahn, JR
硅是一个非常有前途的候选人，以取代石墨作为阳极的锂离子电池，因为它非常高的理论容量。由于这种材料的充放电循环存在严重的问题，它还没有进入商业电池。似乎非晶硅和含非晶硅的合金表现出大大改善的循环性能。因此，希望充分理解Li与a-Si的反应。为此，在原位X-射线衍射研究的锂与a-Si的反应已被执行。结果证实，如Obrovac和Christensen在《电化学和固态快报》上发表的一篇文章中首次报道的那样，在低于30 mV（相对于Li/Li+）的电压下形成了新的结晶Li 15 Si 4相。然而，结晶相仅在临界厚度约为2 mm以上的a-Si膜中形成。（C）2004电化学学会。
Silicon is a very promising candidate to replace graphite as the anode in Li-ion batteries because of its very high theoretical capacity. It has not yet made its way into commercial cells because of severe problems with the charge and discharge cycling of the material. It seems that amorphous silicon and amorphous silicon-containing alloys exhibit much improved cycling performance. Therefore, it is desirable to fully understand the reaction of Li with a-Si. To this end, an in situ X-ray diffraction study of the reaction of lithium with a-Si has been performed. The results confirm that a new crystalline Li15Si4 phase is formed below 30 mV vs. Li/Li+ as first reported by Obrovac and Christensen in an article published in Electrochemical and Solid-State Letters. However, the crystalline phase only forms for films of a-Si above a critical thickness of about 2 mm. (C) 2004 The Electrochemical Society.