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以分散于十二烷基苯磺酸钠(SDBS)水溶液中的碳纳米管(CNTs)为基体,四氯化锡(SnCl_4)为锡源,硼氢化钠(Na BH4)为还原剂,采用逐层吸附原位沉积工艺制备SnO_2/CNTs复合材料。微观结构显示粒径为2~3 nm的金红石型SnO_2纳米晶均匀包裹在CNTs表面,说明通过在CNTs表面分别吸附BH4-和Sn4+离子,能够有效抑制SnO_2的均相成核-长生,有利于形成同轴结构的SnO_2/CNTs复合材料。该复合材料首次放电容量高达1425.7 m Ah/g,在电流密度为50 m Ah/g时,可逆容量保持在500 m Ah/g,其容量和循环稳定性均优于纯SnO_2。
Using carbon nanotubes (CNTs) dispersed in aqueous sodium dodecylbenzenesulfonate (SDBS) as matrix, tin tetrachloride (SnCl_4) as tin source and sodium borohydride (Na BH4) as reducing agent, Preparation of SnO_2 / CNTs Composites by Layer Adsorption In - situ Deposition. The microstructure showed that the size of 2 ~ 3 nm rutile SnO 2 nanocrystals uniformly wrapped on the CNTs surface, indicating that by adsorbing BH 4 - and Sn 4 + ions on the surface of CNTs, respectively, can effectively inhibit the homogeneous nucleation of SnO 2 - is conducive to the formation of Coaxial structure of SnO_2 / CNTs composites. The first discharge capacity of this composite was as high as 1425.7 m Ah / g, and its reversible capacity was maintained at 500 mAh / g at a current density of 50 mAh / g. The capacity and cycle stability of the composite were better than pure SnO_2.