Walter Marc, Erni Rolf, Kovalenko Maksym V
1] Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland [2] Laboratory for Thin Films and Photovoltaics, Empa - Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland.
Electron Microscopy Center, Empa - Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland.
Sci Rep. 2015 Feb 12;5:8418. doi: 10.1038/srep08418.
Sodium-ion batteries increasingly become of immense research interest as a potential inexpensive alternative to Lithium-ion batteries. Development of high-energy-density negative electrodes (anodes) remains to be a great challenge, especially because of significant differences between lithium and sodium chemistries. Two Na-ion anode materials - antimony (Sb) and phosphorus (P) - have been recently shown to offer excellent cycling stability (Sb) and highest known Na-ion charge storage capacity (P). In this work we report on the synergistic Na-ion storage in a P/Sb/Cu-nanocomposite, produced by mixing inexpensive colloidal Sb nanocrystals with red P and with copper (Cu) nanowires. In comparison to electrodes composed of only phosphorus, such P/Sb/Cu-composite shows much greater cycling stability providing a capacity of above 1100 mAh g(-1) after 50 charge/discharge cycles at a current density of 125 mA g(-1). Furthermore, P/Sb/Cu-composite also exhibits excellent rate-capability, with capacity of more than 900 mAh g(-1) at a high charge/discharge current density of 2000 mA g(-1).
钠离子电池作为锂离子电池潜在的廉价替代品，越来越受到广泛的研究关注。开发高能量密度的负极（阳极）仍然是一个巨大的挑战，特别是由于锂和钠化学性质存在显著差异。最近有两种钠离子负极材料——锑（Sb）和磷（P）——已被证明分别具有出色的循环稳定性（Sb）和已知最高的钠离子电荷存储容量（P）。在这项工作中，我们报道了通过将廉价的胶体锑纳米晶体与红磷和铜（Cu）纳米线混合制备的P/Sb/Cu纳米复合材料中的协同钠离子存储。与仅由磷组成的电极相比，这种P/Sb/Cu复合材料显示出更大的循环稳定性，在125 mA g⁻¹的电流密度下经过50次充放电循环后提供超过1100 mAh g⁻¹的容量。此外，P/Sb/Cu复合材料还表现出优异的倍率性能，在2000 mA g⁻¹的高充放电电流密度下容量超过900 mAh g⁻¹。
