Department of Chemical Engineering, Pohang University of Science and Technology-POSTECH, Pohang, Kyungbuk 790-784, Korea.
ACS Nano. 2013 Feb 26;7(2):1036-44. doi: 10.1021/nn303570s. Epub 2013 Jan 23.
We report a facile "one-pot" method for the synthesis of Sn-embedded carbon-silica (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⁻¹ at a current density of 45 mA g⁻¹, and 440 mA h g⁻¹ at a current density of 300 mA g⁻¹) 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.
我们通过将间苯二酚（碳前体）、四乙氧基硅烷（TEOS）和三丁基苯基锡（Sn 前体）与两亲性嵌段共聚物聚（氧化乙烯-b-苯乙烯）PEO-b-PS 的选择性相互作用，报告了一种简便的“一锅法”合成 Sn 嵌入碳硅（CS）介孔（纳米结构）复合材料的方法。我们已经获得了从 Sn 纳米线到嵌入 CS 框架中的球形 Sn 纳米颗粒的独特形态转变。金属 Sn 物种均匀地嵌入刚性 CS 框架中，并有效地限制在纳米结构内。所得复合材料可用作锂离子电池的阳极材料，在 45 mA g⁻¹ 的电流密度下具有 600 mA h g⁻¹ 的高比容量，在 300 mA g⁻¹ 的电流密度下具有 440 mA h g⁻¹ 的高比容量和优异的循环性能，经过 100 次循环后库仑效率仍保持在较高水平。最重要的是，由于其多功能性和简便性，本工作开发的用于合成功能性杂化材料的新方法可以扩展到各种功能性纳米复合材料的制备。
