N-doped Carbon Coated Bismuth Nanorod with Hollow Structure as Anode for Superior-Performance Potassium-Ion Batteries
Bismuth (Bi) is a promising anode material for potassium-ion battery due to its high energy density. However, the large volume change limits its application. Herein, N-doped carbon coated Bi nanorods with hollow structure are fabricated and present excellent long-cycling performance (88% capacity retention over 1000 cycles) and high-rate ability (297 mAh g-1 at 20C, 94% capacity of that at 1C). Furthermore, the mechanism was expounded by in-situ XRD results, indicating a multi-phase reaction for the initial discharge process and three two-phase reactions for the subsequent charge/discharge processes.