Potassium-ion batteries (PIBs) hold great potential as an alternative to lithium-ion batteries due to the abundant reserves of potassium and similar redox potentials of K⁺/K and Li⁺/Li. Unfortunately, PIBs with carbonaceous electrodes present sluggish kinetics, resulting in unsatisfactory cycling stability and poor rate capability. Herein, we demonstrate that the synergistic effects of the enlarged interlayer spacing and enhanced capacitive behavior induced by the co-doping of nitrogen and sulfur atoms into a carbon structure (NSC) can improve its potassium storage capability. Based on the capacitive contribution calculations, electrochemical impedance spectroscopy, the galvanostatic intermittent titration technique, and density functional theory results, the NSC electrode is found to exhibit favorable electronic conductivity, enhanced capacitive adsorption behavior, and fast K⁺ ion diffusion kinetics. Additionally, a series of ex-situ characterizations demonstrate that NSC exhibits superior structural stability during the (de)potassiation process. As a result, NSC displays a high reversible capacity of 302.8 mAh g⁻¹ at 0.1 A g⁻¹ and a stable capacity of 105.2 mAh g⁻¹ even at 2 A g⁻¹ after 600 cycles. This work may offer new insight into the effects of the heteroatom doping of carbon materials on their potassium storage properties and facilitate their application in PIBs.

钾离子电池 (PIB) 由于钾储量丰富且 K ⁺ /K 和 Li ^{+具有相似的氧化还原电位，因此作为锂离子电池的替代品具有巨大潜力}/李。不幸的是，带有碳质电极的 PIBs 表现出缓慢的动力学，导致不令人满意的循环稳定性和较差的倍率性能。在此，我们证明了通过将氮和硫原子共掺杂到碳结构 (NSC) 中，扩大层间距和增强电容行为的协同效应可以提高其钾储存能力。基于电容贡献计算、电化学阻抗谱、恒电流间歇滴定技术和密度泛函理论结果，发现 NSC 电极具有良好的电子导电性、增强的电容吸附行为和快速的 K ⁺离子扩散动力学。此外，一系列异地表征表明 NSC 在（去）钾化过程中表现出优异的结构稳定性。结果，NSC在 0.1 A g ^{-1下显示出 302.8 mAh g -1}的高可逆容量，在 600 次循环后即使在 2 A g ^{-1下也显示出 105.2 mAh g -1}的稳定容量。这项工作可能为碳材料的杂原子掺杂对其钾储存性能的影响提供新的见解，并促进它们在 PIBs 中的应用。