One-Pot Synthesis of Tin-Embedded Carbon/Silica Nanocomposites for Anode Materials in Lithium-Ion Batteries

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• 作者：Jongkook Hwang ; Seung Hee Woo ; Jongmin Shim ; Changshin Jo ; Kyu Tae Lee ; Jinwoo Lee
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：February 26, 2013
• 年：2013
• 卷：7
• 期：2
• 页码：1036-1044
• 全文大小：532K
• 年卷期：v.7,no.2(February 26, 2013)
• ISSN：1936-086X

文摘

We report a facile 鈥渙ne-pot鈥?method for the synthesis of Sn-embedded carbon鈥搒ilica (CS) mesostructured (nanostructured) composites through the selective interaction of resol (carbon precursor), tetraethylorthosilicate (TEOS), and tributylphenyltin (Sn precursor) with an amphiphilic diblock copolymer, poly(ethylene oxide-b-styrene), PEO-b-PS. A unique morphology transition from Sn nanowires to spherical Sn nanoparticles embedded in CS framework has been obtained. Metallic Sn species are homogeneously embedded in a rigid CS framework and are effectively confined within the nanostructures. The resulting composites are used as anode materials for lithium-ion batteries and exhibit high specific capacities (600 mA h g ^鈥? at a current density of 45 mA g^鈥?, and 440 mA h g^鈥? at a current density of 300 mA g^鈥?) and an excellent cyclability of over 100 cycles with high Coulombic efficiency. Most of all, the novel method developed in this work for synthesizing functional hybrid materials can be extended to the preparation of various functional nanocomposites owing to its versatility and facileness.

Keywords:

block copolymer; self-assembly; nanocomposites; anodes; lithium-ion batteries