The relationship between pore volume within pore structure and electrochemical performance is rarely studied, especially for potassium-ion batteries (PIBs). Herein, a series of porous carbon (MPC-Ts) with various pore structures including surface area, pore size and pore volume are fabricated in the closed autoclave by regulating the pressure medium and carbonization temperature. Combined with structural characterization, ex situ tests, electrochemical measurements and DFT calculations, it is demonstrated that the intercalation capacity is positively correlated with I_G/I_D ratio rather than interlayer distance, and adsorption capacity is positively correlated with mesopore volume rather than surface area or pore size. Mesopores can not only serve as active sites for potassium ion storage with low potential plateau but also promote ions migration and accommodate the huge volume expansion during (de)potassiation process. As a result, the optimized sample (APC-700) with the largest mesopore volume and appropriate surface area exhibits a high capacity of 633.2 mA h g⁻¹ at 50 mA g⁻¹, and maintains a reversible capacity of 263.9 mA h g⁻¹ at 1000 mA g⁻¹ after 1000 cycles. Even at 2000 mA g⁻¹ and 5000 mA h g⁻¹ after 10000 cycles, the capacities of 124.1 and 100.3 mA h g⁻¹ can still be obtained, respectively.

很少研究孔结构内的孔体积与电化学性能之间的关系，尤其是对于钾离子电池（PIB）。在此，通过调节压力介质和碳化温度，在密闭高压釜中制备了具有各种孔隙结构（包括表面积，孔径和孔体积）的一系列多孔碳（MPC-Ts）。结合结构表征，异位测试，电化学测量和DFT计算，证明插层容量与I _G / I _D正相关。比率而不是层间距离，并且吸附能力与中孔体积而不是表面积或孔径正相关。中孔不仅可以充当低电位平台的钾离子存储的活性位点，还可以促进离子迁移并适应（去）钾化过程中的大量体积膨胀。其结果，最优化的样品（APC-700）具有最大中孔体积和适当的表面积显示出高容量的633.2毫安ħ克^-1在50mA克^-1，并维持的263.9毫安ħg的可逆容量^-1在1000次循环后1000 mA g ^-1。即使在2000 mA g ^-1和5000 mA h g ^-1时在10000次循环之后，仍然可以分别获得124.1和100.3 mA h g ^-1的容量。