A simple melt-spinning/chemical-etching process is developed to create porous carbon-free SnSb anodes. Sodium ion batteries (SIBs) incorporating these anodes exhibit excellent electrochemical performances by accomodating large volume changes during repeated cycling. The porous carbon-free SnSb anode produced by the melt-spinning/chemical-etching process shows a high reversible capacity of 481 mAh g⁻¹, high ICE of 80%, stable cyclability with a high capacity retention of 99% after 100 cycles, and a fast rate capability of 327 mAh g⁻¹ at 4C-rate. Ex-situ X-ray diffraction and high resolution-transmission electron microscopy analyses demonstrate that the synthesized porous carbon-free SnSb anodes involve the highly reversible reaction with sodium through the conversion and recombination reactions during sodiation/desodiation process. The novel and simple melt-spinning/chemical-etching synthetic process represents a technological breakthrough in the commercialization of Na alloy-able anodes for SIBs.

开发了一种简单的熔体纺丝/化学蚀刻工艺来创建多孔的无碳SnSb阳极。包含这些阳极的钠离子电池（SIB）通过适应重复循环过程中的大体积变化而展现出出色的电化学性能。通过熔融纺丝/化学蚀刻工艺生产的多孔无碳SnSb阳极表现出481 mAh g ^-1的高可逆容量，80％的高ICE，稳定的可循环性以及100次循环后99％的高容量保持率，以及327 mAh g ^-1的快速速率能力以4C的速率。异位X射线衍射和高分辨率透射电子显微镜分析表明，合成的多孔无碳SnSb阳极在钠化/脱氧过程中通过转化和重组反应参与了与钠的高度可逆反应。新颖且简单的熔体纺丝/化学蚀刻合成工艺代表了用于SIB的可钠合金阳极的商业化技术突破。