MoBT boosting the electrochemical kinetics and NaS adsorption of SnS anode in sodium ion batteries.

SnS with high theoretical capacity, large lamellar spacing, and favorable voltage plateau is considered as a highly prospective anode material for sodium-ion batteries (SIBs). Nevertheless, the unsatisfied intrinsic conductivity and damaging volume variation during cycles restricted its specific capacity and potential application. In this work, a synergistic sodium storage of interfacial engineering and NaS adsorption was proposed to boost the electrochemical kinetics of SnS by vertically growing SnS@C nanosheets on MBenes. The experimental and theoretical calculation results verified that the nanosheets, heterogeneous interface, and charge transfer between MoBT and SnS offered rapid ion diffusion pathways and ameliorated the intrinsic conductivity, promoting the electrochemical kinetics. The sufficient sulfur vacancies and strong adsorption ability of NaS on MBenes provided supplementary active sites for ion adsorption and suppressed the shuttle effect of NaS, improving the electrochemical capacity and reversibility. Consequently, the MBenes-SnS@C anode delivered high capacities of 411 mAh g at 1 A g and 420 mAh g after 100 cycles at 0.5 A g. The synergistic sodium storage mechanism arising from interfacial effects and NaS adsorption offered novel insights for the rational design of high-performance transition metal sulfide anodes for SIBs.