Potassium‐ion batteries (PIBs) represent a promising alternative to lithium‐ion batteries owing to the high abundance and low cost of potassium resources. However, it is still a challenge to design anode materials with superior electrochemical performance because of the intrinsic large ionic radius and heavy molar mass of K⁺. Here, highly nitrogen‐doped porous carbon nanosheets (N‐PCNs) were fabricated through a template‐removal method. As an anode in PIBs, N‐PCNs exhibits superior rate property of 127.5 mAh g⁻¹ at a current density of 5 A g⁻¹ and cycling stability of 151.2 mAh g⁻¹ after 10000 cycles at 1 A g⁻¹. These remarkable performances originate from ultra‐high N doping (12 at%) as well as high specific surface area (848.3 m² g⁻¹) with abundant hierarchical pores, which supply numerous active sites for K⁺ insertion/extraction, enhance the electronic conductivity, and also offer efficient electrolyte diffusion paths. Density functional theory calculations demonstrate that pyrrolic‐ and pyridinic‐N doping can efficiently promote the adsorption of K⁺ and reduce volume expansion after the insertion of K⁺, leading to high specific capacity and superior cycling stability of N‐PCNs.

中文翻译：

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高氮掺杂多孔碳纳米片作为钾离子电池的高性能阳极

钾离子电池（PIB）代表了锂离子电池的有前途的替代品，这归因于钾资源的丰富和低成本。然而，由于固有的较大的离子半径和较重的K ⁺摩尔质量，设计具有优异电化学性能的阳极材料仍然是一个挑战。在这里，高氮掺杂的多孔碳纳米片（N-PCNs）是通过模板去除法制造的。如在PIB的阳极，127.5毫安克N- PCN类表现出优良的速率特性^-1以5 g的电流密度^-1和151.2毫安克循环稳定性^-1 10000次循环后1 A G ^-1。这些非凡的性能源自超高的N掺杂（12 at％）以及具有丰富的分级孔的高比表面积（848.3 m ²  g ^-1），为K ⁺插入/提取提供了许多活性位点，从而增强了电子性能。导电性，并提供有效的电解质扩散路径。密度泛函理论计算表明，吡咯-和吡啶-N掺杂可以有效地促进K ⁺的吸附并减少K ⁺插入后的体积膨胀，从而导致N-PCN的高比容量和优异的循环稳定性。