Carbon materials are widely exploited in anode materials for potassium ion batteries (PIBs) due to low cost and non-toxicity. Herein, multi-level porous carbon (MLPC) for PIBs is obtained by facile synthesis method. According to analysis results, the MLPC with three dimensional (3D) interconnected networks possesses high specific surface area (671.56 m² g⁻¹), enhancing the electronic, as well as ionic transfer. Meanwhile, the multi-level pores pertaining to micropores on the surface of nanofibers, micropores and mesopores between nanofibers and nanofibers, and macropores originating from the interlinked networks, are observed in the MLPC. The micro and mesoporous structures facilitate K-ion adsorption/desorption, and promote capacitive-controlled contributions, which improves the electrochemical reaction kinetics of the PIBs. Additionally, the macropores providing shorter K-ion transportation pathways further promote the K-ion diffusion. Given aforementioned unique structural features, the depotassiation capacity of 136.9 mAh g⁻¹ is remained at 5.0 A g⁻¹ over 9600 cycles. Moreover, remarkable reversible capacity of 260.1 mAh g⁻¹ is achieved at a high charge/discharge rate of 2.0 A g⁻¹. These results confirm the MLPC is a promising anode material for the PIBs with stable cycling, fast charge, and long lifespan.

由于低成本和无毒，碳材料被广泛用于钾离子电池（PIB）的负极材料中。在此，通过容易的合成方法获得用于PIB的多级多孔碳（MLPC）。根据分析结果，具有三维（3D）互连网络的MLPC具有较高的比表面积（671.56 m ² g ^{- 1}），增强电子以及离子传递。同时，在MLPC中观察到与纳米纤维表面上的微孔有关的多级孔，纳米纤维与纳米纤维之间的微孔和中孔以及源自互连网络的大孔。微孔和中孔结构促进了K离子的吸附/解吸，并促进了电容控制的贡献，从而改善了PIB的电化学反应动力学。另外，提供更短的钾离子传输途径的大孔进一步促进了钾离子扩散。鉴于上述独特的结构特征，136.9 mAh g ^{- 1}的去金属化能力保持在5.0 A g ^{- 1}超过9600个周期。此外，260.1毫安克显着可逆容量^{- 1}在2.0 A g的高充电/放电速率达到^{- 1}。这些结果证实了MLPC是PIB的有希望的阳极材料，具有稳定的循环，快速充电和长寿命。