Ultrasmall Tin Nanodots Embedded in Nitrogen-Doped Mesoporous Carbon: Metal-Organic-Framework Derivation and Electrochemical Application as Highly Stable Anode for Lithium Ion Batteries

作者：Dai, Ruoling; Sun, Weiwei; Wang, Yong^*

来源：Electrochimica Acta, 2016, 217: 123-131.

DOI：10.1016/j.electacta.2016.08.051

• Tin Nanodot
• Nitrogen-Doping
• Mesoporous Carbon
• Metal-Organic-Frameworks
• Lithium Ion Battery

This work reports a facile metal-organic-framework based approach to synthesize Sn/C composite, in which ultrasmall Sn nanodots with typical size of 2-3 nm are uniformly embedded in the nitrogen-doped porous carbon matrix (denoted as Sn@NPC). The effect of thermal treatment and nitrogen doping are also explored. Owing to the delicate size control and confined volume change within carbon matrix, the Sn@NPC composite can exhibit reversible capacities of 575 mAh g(-1) (Sn contribution: 1091 mAh g(-1)) after 500 cycles at 0.2 A g(-1) and 507 mAh g(-1) (Sn contribution: 1077 mAh g(-1)) after 1500 cycles at 1 A g(-1). The excellent long-life electrochemical stability of the Sn@NPC anode has been mainly attributed to the uniform distribution of ultrasmall Sn nanodots and the highly-conductive and flexible N-doped carbon matrix, which can effectively facilitate lithium ion/electron diffusion, buffer the large volume change and improve the structure stability of the electrode during repetitive cycling with lithium ions.

• 出版日期2016-11-1
• 单位上海大学