Center for Functional Nanomaterials and Energy Sciences & Technology Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
ACS Appl Mater Interfaces. 2010 May;2(5):1548-51. doi: 10.1021/am100218v.
FeSn(2), Cu(6)Sn(5), CoSn(3), and Ni(3)Sn(4) single-crystalline nanospheres with a characteristic uniform particle size of approximately 40 nm have been synthesized via a modified polyol process, aiming at determining and understanding their intrinsic cycling performance as negative electrode materials for lithium-ion batteries. We find that, in this morphologically controlled condition, the reversible capacities follow FeSn(2) > Cu(6)Sn(5) approximately CoSn(3) > Ni(3)Sn(4), which is not directly decided by their theoretical capacities or lithium-driven volume changes. FeSn(2) exhibits the best electrochemical activity among these intermetallic nanospheres and an effective solid electrolyte interface, which explains its superior cycling performance. The small particle dimension also improves cycling stability and Li(+) diffusion.
通过改进的多元醇工艺，成功合成了具有约 40nm 均匀粒径特征的 FeSn(2)、Cu(6)Sn(5)、CoSn(3)和 Ni(3)Sn(4) 单晶纳米球，旨在确定和了解它们作为锂离子电池负极材料的内在循环性能。我们发现，在这种形态控制条件下，可逆容量遵循 FeSn(2) > Cu(6)Sn(5) ≈ CoSn(3) > Ni(3)Sn(4)，这并不直接取决于它们的理论容量或锂离子驱动的体积变化。FeSn(2)在这些金属间纳米球中表现出最佳的电化学活性和有效的固体电解质界面，这解释了其优异的循环性能。小的颗粒尺寸也提高了循环稳定性和 Li(+)扩散。
