Hard carbon material is one of the most promising anode materials for potassium ion batteries (PIBs) due to its distinct disordered and non-expandable framework. However, the intrinsically disordered microarchitecture of hard carbon results in low electric conductivity and poor rate capability. Herein, nitrogen-doped and partially graphitized hard carbons (NGHCs) derived from commercial coordination compound precursor-ethylenediaminetetraacetic acid (EDTA) disodium cobalt salt hydrate are designed and prepared as high-performance PIBs anode materials. By means of a facile annealing method, nitrogen elements and graphitic domains can be controllably introduced to NGHCs. The resulting NGHCs show structural merits of mesoporous construction, nitrogen doping and homogeneous graphitic domains, which ensures fast kinetics and electron transportation. Applying in anode for PIBs, NGHCs exhibit robust rate capability with high reversible capacity of 298.8 mAh g⁻¹ at 50 mA g⁻¹, and stable cycle stability of 137.6 mAh g⁻¹ at 500 mA g⁻¹ after 1000 cycles. Moreover, the ex situ Raman spectra reveal a mixture “adsorption–intercalation mechanism” for potassium storage of NGHCs. More importantly, full PIBs by pairing with perylenetetracarboxylic dianhydride (PTCDA) cathode demonstrate the promising potential of practical application. In terms of commercial precursor, facile synthesis and long cycle lifespan, NGHCs represent a brilliant prospect for practical large-scale applications.

硬碳材料由于其独特的无序且不可膨胀的框架而成为钾离子电池（PIB）最有希望的负极材料之一。然而，硬碳固有的无序微结构导致低电导率和差的速率能力。本文中，设计并制备了由商业配位化合物前体-乙二胺四乙酸（EDTA）钴酸钴钠水合物衍生的氮掺杂和部分石墨化的硬碳（NGHCs），并将其制备为高性能PIB阳极材料。借助简便的退火方法，可以将氮元素和石墨域可控地引入NGHC。生成的NGHC具有中孔结构，氮掺杂和均质石墨域的结构优点，可确保快速动力学和电子传输。^-1在50mA克^-1，和137.6毫安克稳定的循环稳定性^-1以500mA克^-1 1000次循环之后。此外，异位拉曼光谱揭示了NGHCs钾储存的混合物“吸附-嵌入机制”。更重要的是，通过与per四甲酸二酐（PTCDA）阴极配对的完整PIB展示了实际应用的潜力。就商业化的前体，简便的合成和长的循环寿命而言，NGHCs代表了大规模实际应用的光明前景。