Interfacial coupling metallic MoS₂ nanosheets with wrinkled Ti₃C₂T_X MXene for reversible and stable sodium storage

Owing to high electronic conductivity and large interlayer spacing, 1T–MoS₂ has attracted remarkable attention as one of the most potential anode materials for sodium-ion batteries. However, the electrochemical instability seriously hinders its wide application. The high reversible regeneration of Mo–S bonds to pristine 1T–MoS₂ inevitably determines electrochemical reversibility of 1T–MoS₂. Herein, hierarchical 1T–MoS₂/MXene architectures demonstrate impressive Na–storage performance with stable reversibility. The theoretical simulation results reveal that the favorable structure of Na–S bonding at Mo/MXene heterointerfaces weakens Na–S bond and thereby decreases the recombination energies of Mo–S bond upon desodiation, greatly promoting reversible Na–storage. Moreover, the ex operando X-ray diffraction and Raman spectra further demonstrate an efficient reversible conversion reaction in 1T–MoS₂/MXene anode. Therefore, the heterogenous 1T–MoS₂/MXene achieves a considerable performance as a sodium-ion battery anode material.