Enhanced Li Storage Capacity in 3 nm Diameter SnO2 Nanocrystals Firmly Anchored on Multiwalled Carbon Nanotubes
Enhanced Li Storage Capacity in 3 nm Diameter SnO2 Nanocrystals Firmly Anchored on Multiwalled Carbon Nanotubes
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DOI：
10.1021/jp208021w
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发表时间：
2011-11-10
影响因子：
3.7
通讯作者：
Kim, Dong-Wan
中科院分区：
文献类型：
--
作者：
Jin, Yun-Ho;Min, Kyung-Mi;Kim, Dong-Wan
一个简单的合成路线证明了混合纳米复合电极的制备与SnO 2纳米粒子和导电多壁碳纳米管（MWCNTs）的组合，用于锂离子电池的应用。MWCNT最初使用强酸溶液处理以在其表面上产生具有负电荷的官能团。在纳米复合材料的形成过程中，功能化的MWCNTs和Sn 4+之间的相互静电相互作用驱动了下一个过程。离子物种，然后在150 ℃的水热反应期间进行自发氧化。直径小于3 nm的SnO 2纳米颗粒均匀地负载在MWCNT表面上，提供了接近240 m2 g-1的极大的Brunauer-Emmett-Teller（BET）表面积。此外，我们证明了多壁碳纳米管的引入引起了增强的可逆容量，估计在100次循环后为420 mA h g-1，其比纯SnO 2纳米颗粒的至少大三倍。
A simple synthesis route is demonstrated for the preparation of hybrid nanocomposite electrodes with a combination of SnO2 nanoparticles and conducting multiwalled carbon nanotubes (MWCNTs) for Li ion battery applications. The MWCNTs were initially treated using strong acid solutions to generate functional groups with negative charges on their surfaces. Far the formation of the nanocomposites, the next process was driven by the mutual electrostatic interactions between the functionalized MWCNTs and the Sn4+. ion species and was followed by spontaneous oxidation during a hydrothermal reaction at 150 degrees C. The SnO2 nanoparticles with diameters of less than 3 nm were uniformly loaded onto the MWCNT surfaces, providing an extremely large Brunauer-Emmett-Teller (BET) surface area of approximate to 240 m(2) g(-1) Furthermore, We demonstrate that the incorporation of multiwalled carbon nanotubes gives rise to an enhanced reversible capacity estimated to be 420 mA h g(-1) after 100 cycles, which is at least three times greater than that of pure SnO2 nanoparticles.