Potassium ion hybrid capacitors(PIHC)have promising applications in medium and large-scale energy storage systems due to their high energy/power density,abundant potassium resource and low cost.However,the slow kinetics of battery-type anodes originating from the large-size K+results in a mismatch between the two electrodes,rendering the modest energy density of PIHC.Herein,we first develop an electrospinning strategy to successfully synthesize fibrous precursor by using the HNO3 pre-oxidized low-softening-point coal pitch as the low-cost raw material.With further carbonization or KOH activation,the two types of carbon nanofibers(CNF)are fabricated as anode and cathode materials,respectively,towards the dual-carbon PIHC devices.Thanks to its three-dimensional interconnected porous conducting network and large layer spacing,the resulted CNF anode material is endowed with high reversible capacities,excellent rate and long cycle stability.Meanwhile,the activated CNF cathode with a large surface area of 2169 m2·g-1 exhibits excellent capacitive performance.A PIHC constructed with the two fibrous electrodes delivers an energy density of 110.0 Wh·kg-1 at 200.0 W kg-1,along with a capacitance retention of 83.5％after 10,000 cycles at 1.0 A·g-1.The contribution here provides a cost-efficiency avenue and platform for advanced dual-carbon PIHC.

Guang-Yuan Wang;Xiao-Hong Wang;Jin-Feng Sun;Ya-Min Zhang;Lin-Rui Hou;Chang-Zhou Yuan

School of Materials Science and Engineering,University of Jinan,Jinan 250022,China

稀有金属（英文版）

[1]Guang-Yuan Wang;Xiao-Hong Wang;Jin-Feng Sun;Ya-Min Zhang;Lin-Rui Hou;Chang-Zhou Yuan-.Porous carbon nanofibers derived from low-softening-point coal pitch towards all-carbon potassium ion hybrid capacitors)[J].稀有金属（英文版）,2022(11):3706-3716

PIHC,K+results

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