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Monodisperse CoSn2 and FeSn2 nanocrystals as high-performance anode materials for lithium-ion batteries†
Nanoscale ( IF 6.7 ) Pub Date : 2018-03-29 00:00:00 , DOI: 10.1039/c7nr08261d
Shutao Wang 1, 2, 3, 4, 5 , Meng He 1, 2, 3, 4, 5 , Marc Walter 1, 2, 3, 4, 5 , Frank Krumeich 1, 2, 3, 4 , Kostiantyn V. Kravchyk 1, 2, 3, 4, 5 , Maksym V. Kovalenko 1, 2, 3, 4, 5
Affiliation  

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.

中文翻译:

单分散CoSn 2和FeSn 2纳米晶体作为锂离子电池的高性能负极材料

纳米结构金属合金有望作为石墨阳极的替代材料,并可以改善当今锂离子电池(LIB)的能量和功率密度。本文中,我们报道了在还原条件下,通过Co或Fe NCs和SnCl 2在油胺中的反应,轻松实现CoSn 2和FeSn 2纳米晶体(NCs)的胶体合成。在我们的纯Sn NCs以及Co或Fe和Sn与NCs的混合物中,单分散CoSn 2纳米合金显示出明显改善的循环稳定性。尤其是,CoSn 2在1984 mA g -1的高电流密度下可在5000个循环中提供650 mA hg -1的稳定平均容量,这是锡基负极材料循环稳定性最高的报告之一。
更新日期:2018-03-29
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