SnO2–graphene–carbon nanotube mixture for anode material with improved rate capacities
SnO2–graphene–carbon nanotube mixture for anode material with improved rate capacities
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DOI：
10.1016/j.carbon.2011.06.059
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发表时间：
2011-11
期刊：
影响因子：
10.9
通讯作者：
Biao Zhang;Q. Zheng;Z. Huang;Sei-Woon Oh;J. Kim
中科院分区：
文献类型：
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作者：
Biao Zhang;Q. Zheng;Z. Huang;Sei-Woon Oh;J. Kim
以氧化石墨烯为前驱体，制备了SnO 2-石墨烯-碳纳米管（SnO 2-G-CNT）复合材料，并将其应用于锂离子二次电池的负极材料。结果表明，粒径为3- 6 nm的SnO 2纳米粒子不仅通过表面官能团的锚定作用附着在石墨烯片表面，而且包裹在石墨烯片缠结形成的孔道中.碳纳米管的掺入通过形成3D电子导电网络降低了由混合物制成的阳极的电荷转移电阻。SnO 2-G-CNT阳极在1.5和0.25Ag−1时分别提供345和635 mAhg −1的显着容量。还使用简单的真空过滤技术制备了由高度对准的SnO 2-G-CNT纸组成的柔性电极。通过SnO 2纳米颗粒的高比容量和G-CNT纸的优异循环性能的协同作用，它们在0.1Ag− 1下50次循环后的稳定容量为387 mAhg − 1。
SnO2–graphene–carbon nanotube (SnO2–G–CNT) mixture is synthesized using graphene oxide as precursor for application as anode material in rechargeable Li ion batteries. It is shown that the SnO2nanoparticles of 3–6nm in diameter are not only attached onto the surface of graphene sheets by anchoring with surface functional groups, but they also are encapsulated in pore channels formed by entangled graphene sheets. The incorporation of carbon nanotubes reduces the charge transfer resistance of the anode made from the mixture through the formation of 3D electronic conductive networks. The SnO2–G–CNT anodes deliver remarkable capacities of 345 and 635mAhg−1at 1.5 and 0.25Ag−1, respectively. Flexible electrodes consisting of highly-aligned SnO2–G–CNT papers are also prepared using a simple vacuum filtration technique. They present a stable capacity of 387mAhg−1at 0.1Ag−1after 50 cycles through the synergy of the high specific capacity of SnO2nanoparticles and the excellent cycleability of G–CNT paper.