NiSe nanoparticles anchored on hollow carbon nanofibers with enhanced rate capability and prolonged cycling durability for sodium‐ion batteries

Abstract Nickel selenides have been studied as potential anode materials for sodium‐ion batteries due to their high theoretical capacity. However, the low electrical conductivity and the large volumetric variation during the charging/discharging process greatly reduce the specific capacity and cycling lifespan of the batteries. In this paper, a simple strategy to fabricate NiSe nanoparticles enclosed in carbon hollow nanofibers (NiSe/C@CNF) is proposed, involving the preparation of Ni‐precursor nanofibers by electrospinning, the coating of polydopamine and the formation of NiSe/C@CNF by calcination and selenization. The combination of NiSe nanoparticles and porous carbon hollow nanofibers creates a strong conductive environment, which enhances the dynamic ability of sodium‐ion transport and improves charge storage capacity. The fabricated NiSe/C@CNF material exhibits excellent performance. It demonstrates a high rate capability, with specific capacities of 406.8 and 300.1 mAh·g −1 at 0.1 and 5.0 A·g −1 , respectively. These results highlight the potential of NiSe/C@CNF as an anode material for sodium‐ion batteries, offering a large capacity and long life.