Rationally Designed Three‐Layered Cu2S@Carbon@MoS2 Hierarchical Nanoboxes for Efficient Sodium Storage

Abstract Hybrid materials, integrating the merits of individual components, are ideal structures for efficient sodium storage. However, the construction of hybrid structures with decent physical/electrochemical properties is still challenging. Now, the elaborate design and synthesis of hierarchical nanoboxes composed of three‐layered Cu 2 S@carbon@MoS 2 as anode materials for sodium‐ion batteries is reported. Through a facile multistep template‐engaged strategy, ultrathin MoS 2 nanosheets are grown on nitrogen‐doped carbon‐coated Cu 2 S nanoboxes to realize the Cu 2 S@carbon@MoS 2 configuration. The design shortens the diffusion path of electrons/Na + ions, accommodates the volume change of electrodes during cycling, enhances the electric conductivity of the hybrids, and offers abundant active sites for sodium uptake. By virtue of these advantages, these three‐layered Cu 2 S@carbon@MoS 2 hierarchical nanoboxes show excellent electrochemical properties in terms of decent rate capability and stable cycle life.