Three-Dimensional Graphene/Single-Walled Carbon Nanotube Aerogel Anchored with SnO2 Nanoparticles for High Performance Lithium Storage

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• 作者：Jing WangFang Fang ; Tao Yuan ; Junhe Yang ; Liang Chen ; Chi Yao ; Shiyou Zheng ; Dalin Sun
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：9
• 期：4
• 页码：3544-3553
• 全文大小：874K
• ISSN：1944-8252

文摘

A unique 3D graphene-single walled carbon nanotube (G-SWNT) aerogel anchored with SnO<sub>2sub> nanoparticles (SnO<sub>2sub>@G-SWCNT) is fabricated by the hydrothermal self-assembly process. The influences of mass ratio of SWCNT to graphene on structure and electrochemical properties of SnO<sub>2sub>@G-SWCNT are investigated systematically. The SnO<sub>2sub>@G-SWCNT composites show excellent electrochemical performance in Li-ion batteries; for instance, at a current density of 100 mA g<sup>–1sup>, a specific capacity of 758 mAh g<sup>–1sup> was obtained for the SnO<sub>2sub>@G-SWCNT with 50% SWCNT in G-SWCNT and the Coulombic efficiency is close to 100% after 200 cycles; even at current density of 1 A g<sup>–1sup>, it can still maintain a stable specific capacity of 537 mAh g<sup>–1sup> after 300 cycles. It is believed that the 3D G-SWNT architecture provides a flexible conductive matrix for loading the SnO<sub>2sub>, facilitating the electronic and ionic transportation and mitigating the volume variation of the SnO<sub>2sub> during lithiation/delithiation. This work also provides a facile and reasonable strategy to solve the pulverization and agglomeration problem of other transition metal oxides as electrode materials.