α-Fe2O3-mediated growth and carbon nanocoating of ultrafine SnO2 nanorods as anode materials for Li-ion batteries
α-Fe2O3-mediated growth and carbon nanocoating of ultrafine SnO2 nanorods as anode materials for Li-ion batteries
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DOI：
10.1039/c1jm14888e
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发表时间：
2012-01
影响因子：
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通讯作者：
Zhiyu Wang;Zichen Wang;S. Madhavi;X. Lou
中科院分区：
文献类型：
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作者：
Zhiyu Wang;Zichen Wang;S. Madhavi;X. Lou
在酸性条件下本体合成SnO 2纳米棒的报道很少。在强酸性条件下，采用α-Fe 2 O3介导的水热法合成了直径小于10 nm，长度为50-100 nm的超细SnO 2纳米棒。结果表明，由于α-Fe 2 O3和SnO 2两种晶格具有良好的相容性，在α-Fe 2 O3衬底上可以诱导SnO 2纳米棒的形成。α-Fe 2 O3基体在酸性条件下溶解，形成纯SnO 2纳米棒。在表面涂覆一层无定形碳后，所得的碳包覆的SnO 2纳米棒被评估为锂离子电池的高容量阳极材料。值得注意的是，它们表现出极大改善的循环稳定性，在0.2 C下具有约800 mA h g−1的高容量，并且即使在0.5-1 C的更高电流速率下在50次循环内也具有令人满意的性能。其优异的电化学性能主要归功于其独特的一维纳米结构和碳纳米涂层。
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.