Hollow Sn鈥揝nO2 Nanocrystal/Graphite Composites and Their Lithium Storage Properties

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• 作者：Youngmin Lee ; Mi Ru Jo ; Kyeongse Song ; Ki Min Nam ; Joon T. Park ; Yong-Mook Kang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：July 25, 2012
• 年：2012
• 卷：4
• 期：7
• 页码：3459-3464
• 全文大小：382K
• 年卷期：v.4,no.7(July 25, 2012)
• ISSN：1944-8252

文摘

Hollow spheres have been constructed by applying the Kirkendall effect to Sn nanocrystals. This not only accommodates the detrimental volume expansion but also reduces the Li⁺ transport distance enabling homogeneous Li鈥揝n alloying. Hollow Sn鈥揝nO₂ nanocrystals show a significantly enhanced cyclic performance compared to Sn nanocrystal alone due to its typical structure with hollow core. Sn鈥揝nO₂/graphite nanocomposites obtained by the chemical reduction and oxidation of Sn nanocrystals onto graphite displayed very stable cyclic performance thanks to the role of graphite as an aggregation preventer as well as an electronic conductor.

Keywords:

Kirkendall effect; hollow core; volume expansion; SnO₂; anode; lithium rechargeable battery