Novel N‐doped multichannel carbon nanofiber architecture with porous CoS nanoprisms for high‐performance potassium‐ion batteries
Jae Bong Lim, Seung‐Keun Park
Abstract
Abstract 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 ).