Sodium ion batteries (SIBs) are widely considered as one of the most potential alternatives to traditional lithium ion batteries (LIBs) thanks to abundance of sodium on earth. Although these batteries have very similar electrochemistry, the graphite-based LIB anode cannot be directly applied for SIBs due to the much larger ionic radius of Na⁺. Herein, we report nitrogen and sulfur co-doped mesoporous carbon (NSPC) as high-performance anode material for SIBs, which is synthesized via a salt template strategy with an ionic liquid as the carbon and doping source. After carbonization, the mesoporous NSPC contains a high nitrogen content of 10.45 wt% and 1.52 wt% of sulfur with an enlarged graphite interlayer spacing to facilitate Na⁺ intercalation. When used as an anode in SIBs, the NSPC shows a good electrochemical performance with a specific capacity of 243 mAh g⁻¹ after 240 charge-discharge cycles at 0.14 A g⁻¹. The reversible capacity remains at 102 mAh g⁻¹ after 5,000 cycles at 1.40 A g⁻¹. The high-performance of the NSPC for Na⁺ storage is attributed to the double doped heteroatoms and mesoporous structure, which synergistically enhance the storage capacity and rate capability, and maintain the electrode stability during cycling.

钠离子电池（SIB）被广泛认为是传统锂离子电池（LIB）最具潜力的替代品之一，这归因于地球上钠的含量很高。尽管这些电池的电化学性质非常相似，但由于Na ^+的离子半径大得多，因此无法将石墨基LIB阳极直接用于SIB 。在本文中，我们报道了氮和硫共掺杂的介孔碳（NSPC）作为SIB的高性能阳极材料，它是通过盐模板策略以离子液体为碳和掺杂源合成的。碳化后，中孔NSPC的氮含量高，为10.45 wt％，硫含量为1.52 wt％，石墨层间距增大，有利于Na ⁺插层。当作为在SIB中的阳极中使用的，NSPC示出了具有243毫安g的比容量的良好的电化学性能^-1 0.14 A G 240次充放电循环后^-1。在1.40A g ^-1下5,000次循环后，可逆容量保持在102 mAh g ^-1。NSPC用于Na ⁺储存的高性能归因于双掺杂杂原子和中孔结构，它们协同增强了储存容量和倍率能力，并在循环过程中保持了电极稳定性。