Novel N-doped multichannel carbon nanofiber architecture with porous CoS nanoprisms for high-performance potassium-ion batteries

초록

Potassium-ion batteries (PIBs) have gained significant attention as an alternative to lithium-ion batteries (LIBs) due to the abundance of potassium (K) and low cost. Nevertheless, the difficulty in finding appropriate electrode materials that can efficiently store the larger K ions has hindered their practical application. Herein, we report a novel anode material, N-doped multichannel carbon nanofibers embedded with porous CoS nanoprisms (CSP@NMCNF), for high-performance PIBs. The CSP@NMCNF was synthesized using a two-step strategy comprising of the electrospinning of Co acetate hydroxide nanoprism/binary polymer blend and a subsequent heat treatment. The porous CoS nanoprisms with an anisotropic morphology were well aligned along the length axis of the N-doped multichannel carbon nanofibers, thus ensuring their structural stability during the repeated charge–discharge process. In addition, numerous pores facilitated the transport of electrons and ions. Accordingly, the CSP@NMCNF anode exhibited excellent electrochemical performance, delivering a high specific capacity of 368 mAh·g−1 at 0.5 A·g−1 after 200 cycles and excellent rate capability (232 mAh·g−1 at 2.0 A·g−1).

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