Ultrafast sodium-ion storage performance of ReS2@rGO anode enabled by defect-to-center diffusion mechanism

ReS₂ materials are regarded as a promising anode material for sodium-ion batteries. However, their practical application is hindered by low electrical conductivity and significant volume expansion, leading to rapid capacity degradation. In this study, a ReS₂@rGO material is constructed, in which the rGO matrix effectively enhances the electrical conductivity and structural stability of ReS₂. More importantly, leveraging the large interlayer spacing and abundant defect structure of ReS₂, the ReS₂@rGO materials enable faster Na-ion storage through short-distance “defect-to-center” diffusion pathways. Owing to this unique architecture, ReS₂@rGO demonstrates excellent electrochemical performance, including a high specific capacity (403.8 mAh g⁻¹) and remarkable cycling stability (84.1 % retention rate).