Abstract
Potassium-ion batteries (KIBs) are promising options for large-scale energy storage because of their low cost and low redox potential. The use of anodes with porous structures is an attractive strategy to improve the electrochemical properties of KIBs. However, the development of KIB anodes has been hindered by their low capacity and difficulty in synthesizing porous structures. Herein, ultrafine vanadium oxide nanoparticles embedded in porous N-doped carbon nanofibers (VO@PNCNFs) using electrospinning and one-step heat treatment are reported. The uniform growth of vanadium oxide crystals is facilitated by the porous structure of the carbon nanofiber. The numerous pores play a crucial role in the transfer of electrons and ions and provide structural stability to the N-doped carbon matrix. As a result, the VO@PNCNF electrode demonstrates a high reversible capacity (∼205 mA h g−1 at 1.0 A g−1), good cycle stability over 3000 cycles, and excellent rate performance (95 mA h g−1 at 3.0 A g−1).
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