화학공학소재연구정보센터
Electrochimica Acta, Vol.105, 629-634, 2013
Facile fabrication of graphene/Cu6Sn5 nanocomposite as the high performance anode material for lithium ion batteries
Graphene/Cu6Sn5 nanocomposite is successfully prepared via a facile one-pot method. Cu6Sn5 nanoparticles with the average size below 10 nm are homogeneously encapsulated into graphene nanosheets. Inactive Cu can release the volume expansion of Sn, prevent Sn from aggregation, and accommodate structural stress. Graphene can enhance mechanical properties, prevent the aggregation between Cu6Sn5 nanoparticles, and provide enough void space to buffer volume change of Cu6Sn5. Part of Cu6Sn5 nanoparticles possesses hollow structure, which is also favorable for volume buffer and stress accommodation. Due to such intriguing structure, it delivers great long term cycling stability and excellent high rate performance. Up to 411.4 mAh g(-1) is obtained after 1600 cycles at a high current density of 500 mA g(-1). The reversible capacity is as large as 220 mAh g(-1) at 10,000 mA g(-1) (merely 80s for discharge or charge). (c) 2013 Elsevier Ltd. All rights reserved.