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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >α-Fe2O3-mediated growth and carbon nanocoating of ultrafine SnO2 nanorods as anode materials for Li-ion batteries
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α-Fe2O3-mediated growth and carbon nanocoating of ultrafine SnO2 nanorods as anode materials for Li-ion batteries

机译：α-Fe2O3介导的超细SnO2纳米棒作为锂离子电池阳极材料的生长和碳纳米涂层

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摘要

Bulk synthesis of SnO2 nanorods under acidic conditions has rarely been reported. In this work, ultrafine SnO2 nanorods with a diameter of less than 10 nm and a length of 50-100 nm have been synthesized by an interesting α-Fe2O3-mediated hydrothermal method under strongly acidic conditions. It has been found that the formation of SnO2 nanorods is induced by the α-Fe2O3 substrate due to good compatibility of the two crystal lattices. The α-Fe2O3 substrate is dissolved under acidic conditions, leading to the formation of pure SnO2 nanorods. After surface coating with a layer of amorphous carbon, the resulting carbon-coated SnO2 nanorods are evaluated as high-capacity anode materials for lithium-ion batteries. Remarkably, they exhibit greatly improved cycling stability with a high capacity of around 800 mA h g~(-1) at 0.2 C and satisfactory performance even at higher current rates of 0.5-1 C within 50 cycles. The excellent electrochemical performance is attributed to the unique one-dimensional nanostructure and the carbon nanocoating.
机译：在酸性条件下大量合成SnO2纳米棒的报道很少。在这项工作中，已经通过有趣的α-Fe2O3介导的水热方法在强酸性条件下合成了直径小于10 nm，长度为50-100 nm的超细SnO2纳米棒。已经发现，由于两个晶格的良好相容性，由α-Fe2O3衬底诱导了SnO2纳米棒的形成。 α-Fe2O3基材在酸性条件下溶解，导致形成纯SnO2纳米棒。在表面涂覆一层无定形碳之后，将所得的碳包覆SnO2纳米棒评估为锂离子电池的高容量负极材料。值得注意的是，它们显示出极大的改善的循环稳定性，即使在50个循环内以0.5-1 C的较高电流速率运行时，其在0.2 C时的高容量仍约为800 mA h g〜（-1）。优异的电化学性能归因于独特的一维纳米结构和碳纳米涂层。

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