Abstract
Potassium-ion batteries(PIBs)have gained significant attention as an alternative to lithium-ion bat-teries(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 car-bon 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-dis-charge 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).
基金项目
National Research Foundation of Korea(NRF)from the Korean government(MSIT)(2020R1C1C1003375)
NETL
NSTL
万方数据