ETH Zürich, Department of Chemistry and Applied Biosciences, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland.
Nanoscale. 2018 Apr 19;10(15):6827-6831. doi: 10.1039/c7nr08261d.
Nanostructured metal alloys show great promise as replacement materials for graphite anodes, and could improve the energy and power density of present-day lithium-ion batteries (LIBs). Herein, we report a facile colloidal synthesis of CoSn2 and FeSn2 nanocrystals (NCs) via the reaction of Co or Fe NCs and SnCl2 in oleylamine under reducing conditions. Among our pure Sn NCs and mixtures of Co or Fe and Sn NCs, monodisperse CoSn2 nanoalloys showed considerably improved cycling stability. In particular, CoSn2 delivered a stable average capacity of 650 mA h g-1 for 5000 cycles at a high current density of 1984 mA g-1, which is among the highest reported cycling stabilities for Sn-based anode materials.
纳米结构金属合金作为石墨阳极的替代材料具有很大的应用前景，有望提高现有锂离子电池（LIB）的能量和功率密度。在此，我们通过在还原条件下，使 Co 或 Fe NCs 与 SnCl2 在油胺中反应，报道了一种简便的 CoSn2 和 FeSn2 纳米晶（NCs）的胶体合成方法。在我们的纯 Sn NCs 和 Co 或 Fe 与 Sn NCs 的混合物中，单分散的 CoSn2 纳米合金显示出显著改善的循环稳定性。特别是，CoSn2 在 1984 mA g-1 的高电流密度下，5000 次循环的稳定平均容量为 650 mA h g-1，这是报道的基于 Sn 的阳极材料中循环稳定性最高的之一。
