Amorphous Ultrathin SnO2 Films by Atomic Layer Deposition on Graphene Network as Highly Stable Anodes for Lithium-Ion Batteries

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• 作者：Ming Xie ; Xiang Sun ; Steven M. George ; Changgong Zhou ; Jie Lian ; Yun Zhou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 23, 2015
• 年：2015
• 卷：7
• 期：50
• 页码：27735-27742
• 全文大小：436K
• ISSN：1944-8252

文摘

Amorphous SnO₂ (a-SnO₂) thin films were conformally coated onto the surface of reduced graphene oxide (G) using atomic layer deposition (ALD). The electrochemical characteristics of the a-SnO₂/G nanocomposites were then determined using cyclic voltammetry and galvanostatic charge/discharge curves. Because the SnO₂ ALD films were ultrathin and amorphous, the impact of the large volume expansion of SnO₂ upon cycling was greatly reduced. With as few as five formation cycles best reported in the literature, a-SnO₂/G nanocomposites reached stable capacities of 800 mAh g^–1 at 100 mA g^–1 and 450 mAh g^–1 at 1000 mA g^–1. The capacity from a-SnO₂ is higher than the bulk theoretical values. The extra capacity is attributed to additional interfacial charge storage resulting from the high surface area of the a-SnO₂/G nanocomposites. These results demonstrate that metal oxide ALD on high surface area conducting carbon substrates can be used to fabricate high power and high capacity electrode materials for lithium-ion batteries.