Pea‐like MoS₂@NiS_1.03–carbon heterostructured hollow nanofibers for high‐performance sodium storage

Abstract The rational synergy of chemical composition and spatial nanostructures of electrode materials play important roles in high‐performance energy storage devices. Here, we designed pea‐like MoS₂@NiS_1.03–carbon hollow nanofibers using a simple electrospinning and thermal treatment method. The hierarchical hollow nanofiber is composed of a nitrogen‐doped carbon‐coated NiS_1.03 tube wall, in which pea‐like uniformly discrete MoS₂ nanoparticles are enclosed. As a sodium‐ion battery electrode material, the MoS₂@NiS_1.03–carbon hollow nanofibers have abundant diphasic heterointerfaces, a conductive network, and appropriate volume variation‐buffering spaces, which can facilitate ion diffusion kinetics, shorten the diffusion path of electrons/ion, and buffer volume expansion during Na⁺ insertion/extraction. It shows outstanding rate capacity and long‐cycle performance in a sodium‐ion battery. This heterogeneous hollow nanoarchitectures designing enlightens an efficacious strategy to boost the capacity and long‐life stability of sodium storage performance of electrode materials.