期刊
NANO RESEARCH
卷 3, 期 11, 页码 813-821出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-010-0050-4
关键词
Graphene; SnO2; surface charge; nanocomposite; rechargeable batteries; lithium
类别
资金
- Ministry of Education and Science and Technology (MEST) [31-2008-000-10055-0, 2009-0094219]
- Ministry of Knowledge Economy [20092020100040]
SnO2/graphene nanocomposites have been fabricated by a simple chemical method. In the fabrication process, the control of surface charge causes echinoid-like SnO2 nanoparticles to be formed and uniformly decorated on the graphene. The electrostatic attraction between a graphene nanosheet (GNS) and the echinoid-like SnO2 particles under controlled pH creates a unique nanostructure in which extremely small SnO2 particles are uniformly dispersed on the GNS. The SnO2/graphene nanocomposite has been shown to perform as a high capacity anode with good cycling behavior in lithium rechargeable batteries. The anode retained a reversible capacity of 634 mA.h.g(-1) with a coulombic efficiency of 98% after 50 cycles. The high reversibility can be attributed to the mechanical buffering by the GNS against the large volume change of SnO2 during delithiation/lithiation reactions. Furthermore, the power capability is significantly enhanced due to the nanostructure, which enables facile electron transport through the GNS and fast delithiation/lithiation reactions within the echinoid-like nano-SnO2. The route suggested here for the fabrication of SnO2/graphene hybrid materials is a simple economical route for the preparation of other graphene-based hybrid materials which can be employed in many different fields.
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