Defect-Rich Crystalline SnO2 Immobilized on Graphene Nanosheets with Enhanced Cycle Performance for Li Ion Batteries

详细信息    查看全文

• 作者：Dongniu Wang ; Xifei Li ; Jiajun Wang ; Jinli Yang ; Dongsheng Geng ; Ruying Li ; Mei Cai ; Tsun-Kong Sham ; Xueliang Sun
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：October 25, 2012
• 年：2012
• 卷：116
• 期：42
• 页码：22149-22156
• 全文大小：502K
• 年卷期：v.116,no.42(October 25, 2012)
• ISSN：1932-7455

文摘

A one-step microwave-assisted hydrothermal method (MAHM) has been developed to synthesize SnO₂/graphene composites. It is shown that fine SnO₂ nanoparticles with an average size of 3.5 nm can be homogeneously deposited on graphene nanosheets (GNSs) using this technique. The electronic structure as revealed from X-ray absorption near edge structure (XANES) shows that the SnO₂ nanoparticles are abundant in surface defects with oxygen vacancies, which facilitate the immobilization of SnO₂ onto GNSs by electronic interaction. Carbon K edge XANES provide direct evidence of strong interaction between SnO₂ and GNSs. The SnO₂/graphene nanocomposites deliver a superior reversible capacity of 635 mAh g^鈥? after 100 cycles and display excellent rate performance. All these desirable features strongly indicate that SnO₂/graphene composite is a promising anode material in high-performance lithium ion batteries.