Hydrothermal synthesis of SnO2 and SnO2@C nanorods and their application as anode materials in lithium-ion batteries
Hydrothermal synthesis of SnO2 and SnO2@C nanorods and their application as anode materials in lithium-ion batteries
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DOI：
10.1039/c3ra42900h
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发表时间：
2013-09
期刊：
影响因子：
3.9
通讯作者：
Linghui Yu;D. Cai;Haihui Wang;M. Titirici
中科院分区：
文献类型：
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作者：
Linghui Yu;D. Cai;Haihui Wang;M. Titirici
我们报道了一种高度可重复的，大规模的方法，用于合成直径为1.4 -8 nm，长度为50 - 80 nm的SnO 2纳米棒。所合成的棒用薄的葡萄糖衍生的碳层涂覆以形成核-壳结构。SnO 2纳米棒作为锂离子电池的负电极进行了测试，由于其纳米尺寸，表现出改善的循环性能。在相对低的温度，即550 °C下热处理碳涂覆的样品。这是因为核-壳结构不能在较高温度下保持，在较高温度下发生SnO 2到Sn的碳热还原，同时损失纳米结构。因此，所得SnO2@C样品具有低电导率。尽管如此，我们发现碳涂层稳定了电极，与未涂覆的材料相比，其显示出更好的循环性能。
We report a highly reproducible, large-scale method for the synthesis of SnO2 nanorods with diameters of ∼4–8 nm, and lengths between 50 and 80 nm. The as-synthesized rods are coated with a thin glucose-derived carbon layer to form a core–shell structure. The SnO2 nanorods were tested as negative electrodes in lithium ion batteries exhibiting improved cycling performance due to their nanosize. The carbon-coated sample was thermally treated at a relatively low temperature, i.e. 550 °C. This is because the core–shell structure could not be preserved at a higher temperatures where carbothermal reduction of SnO2 to Sn occurs with a loss of nanostructure. Therefore the resulting SnO2@C sample has a low conductivity. Despite this, we found that the carbon coating stabilizes the electrode, which shows a better cycling performance compared with the non-coated material.