School of Materials Science and Engineering, South China University of Technology, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, Guangzhou 510640, P.R. China.
Nanoscale. 2013 Dec 7;5(23):11971-9. doi: 10.1039/c3nr03756h.
CNTs filled with amorphous-nanocrystalline SnO2, as a unique SnO2-based nanocomposite structure, were synthesized by a rapid vacuum absorption followed by calcination. The SnO2/CNT nanocomposite anodes had a much higher Li storage capacity than the pristine CNTs, as well as a markedly improved cyclic performance (430 mA h g(-1) after 300 cycles at 0.1 A g(-1)). These superior electrode properties resulted from the unique feature of the amorphous-nanocrystalline mixture of tin oxides stored in the CNT tubes of this nanocomposite, because this structure accommodated the stress and confined the volume change of Li(+) insertion/desertion in Sn. Although the nanocomposites had a large initial irreversible capacity loss due to SEI formation, it could be dramatically reduced by prelithiation treatment of the nanocomposite electrode.
CNTs 填充非晶态纳米晶 SnO2,作为一种独特的基于 SnO2 的纳米复合材料结构,通过快速真空吸附和煅烧合成。SnO2/CNT 纳米复合材料阳极的储锂容量比原始 CNTs 高得多,循环性能也明显提高(在 0.1 A g(-1)下 300 次循环后为 430 mA h g(-1))。这种优越的电极性能源于储存在这种纳米复合材料 CNT 管中的 SnO2 非晶态纳米晶混合物的独特特征,因为这种结构可以适应应力并限制 Li(+)插入/脱出过程中 Sn 的体积变化。尽管纳米复合材料由于 SEI 形成而导致初始不可逆容量损失较大,但通过对纳米复合材料电极进行预锂化处理,可以显著降低这种损失。