Enhancement of the Cyclability of a Si Anode through Co3O4 Coating by the Sol鈥揋el Method

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• 作者：Yoon Hwa ; Won-Sik Kim ; Byeong-Chul Yu ; Seong-Hyeon Hong ; Hun-Joon Sohn
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：April 11, 2013
• 年：2013
• 卷：117
• 期：14
• 页码：7013-7017
• 全文大小：487K
• 年卷期：v.117,no.14(April 11, 2013)
• ISSN：1932-7455

文摘

A nano-Si/Co₃O₄ core鈥搒hell nanostructured material has been successfully prepared using the sol鈥揼el method. The reaction mechanism between Li and the nano-Si/Co₃O₄ core鈥搒hell nanostructured electrode was investigated by ex situ analyses. Metallic Co, Li₂₁Si₈, and amorphous Li₂O phases were formed when fully lithiated, and an amorphous Si, Co₃O₄, and Co phases were identified after charge, indicating that the Co₃O₄ was partially reversible. The nano-Si/Co₃O₄ core鈥搒hell nanostructured electrode showed excellent cyclability, with a reversible capacity of ca. 850 mAh/g over 100 cycles.