A facile hydrazine-assisted hydrothermal method for the deposition of monodisperse SnO2 nanoparticles onto graphene for lithium ion batteries
A facile hydrazine-assisted hydrothermal method for the deposition of monodisperse SnO2 nanoparticles onto graphene for lithium ion batteries
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DOI：
10.1039/c1jm14199f
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Piao, Yuanzhe
中科院分区：
文献类型：
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作者：
Park, Seung-Keun;Yu, Seung-Ho;Piao, Yuanzhe
在这篇手稿中，我们介绍了一个简单的水热法控制生长的SnO 2纳米粒子到氧化石墨烯。肼在控制SnO 2纳米颗粒的形成和结晶以及氧化石墨烯还原为石墨烯中起着重要作用。SnO 2-石墨烯复合材料由3-4 nm的单分散SnO 2纳米晶均匀分散在石墨烯表面组成。它表明，该复合材料可以容纳锂-脱锂循环过程中发生的SnO 2的大体积变化。当用作锂离子电池正极材料时，其首次放电容量为1662 mA h g（-1），在100 mA g（-1）的电流密度下循环50次后，该容量迅速稳定并仍保持在626 mA h g（-1）。即使在3200 mA g（-1）的极高电流密度下，该复合材料在50次循环后仍显示出383 mA h g（-1）的稳定容量。
In this manuscript, we introduce a facile hydrothermal method for the controlled growth of SnO2 nanoparticles onto graphene oxide. Hydrazine plays a fundamental role in controlling the formation and crystallization of SnO2 nanoparticles, and the reduction of graphene oxide to graphene. The SnO2-graphene composite consists of 3-4 nm monodisperse SnO2 nanocrystals homogeneously dispersed at the surface of graphene. It is demonstrated that the composite can accommodate the large volume change of SnO2 which occurs during lithiation-delithiation cycles. When used as an anode material for lithium ion batteries, it exhibits a first discharge capacity of 1662 mA h g(-1), which rapidly stabilizes and still remains at 626 mA h g(-1) even after 50 cycles, when cycled at a current density of 100 mA g(-1). Even at the very high current density of 3200 mA g(-1), the composite displays a stable capacity of 383 mA h g(-1) after 50 cycles.