Lee Kyu T, Jung Yoon S, Oh Seung M
School of Chemical Engineering and Research Center for Energy Conversion & Storage, Seoul National University, Seoul, 151-744, Korea.
J Am Chem Soc. 2003 May 14;125(19):5652-3. doi: 10.1021/ja0345524.
The tributylphenyltin (TBPT)-encapsulated resorcinol (R)-formaldehyde (F) sol was prepared inside the micelles of cetyltrimethylammonium bromide (CTAB). This core-shell-type sol was polymerized and further carbonized to obtain nanosized Sn-encapsulated spherical hollow carbon. The size of spherical hollow carbon and Sn metal particles was controllable by changing the R/CTAB or TBPT/CTAB mole ratio, respectively. It is likely that, when tested as the anode in Li secondary batteries, the spherical hollow carbon acts as a barrier to prevent the aggregation of nanosized Sn particles and provides a void space for Sn metal particles to experience a volume change without a collapse of carbon shell, giving rise to a better cycle performance than that of pure Sn metal.
在十六烷基三甲基溴化铵（CTAB）胶束内部制备了三丁基苯基锡（TBPT）包裹的间苯二酚（R）-甲醛（F）溶胶。将这种核壳型溶胶聚合并进一步碳化，以获得纳米尺寸的锡包裹的球形空心碳。通过分别改变R/CTAB或TBPT/CTAB的摩尔比，可以控制球形空心碳和锡金属颗粒的尺寸。当作为锂二次电池的阳极进行测试时，球形空心碳可能起到屏障作用，防止纳米尺寸的锡颗粒聚集，并为锡金属颗粒提供一个空隙空间，使其在不导致碳壳坍塌的情况下经历体积变化，从而产生比纯锡金属更好的循环性能。
