Binder-free SnS2 sheet array with high sulfur vacancy concentration for enhanced lithium storage performance

Vacancy could not only offer extra active sites for electrochemical reactions, but also induce the change of band gap of electrode materials to enhance the electronic conductivity. In this work, binder-free SnS2 sheet array with high S vacancy concentration was fabricated on carbon paper (CP) by hydrothermal synthesis. When employed as the anode for lithium-ion battery, the SnS2/CP delivers greatly improved capacity, coulombic efficiency, high-rate discharge-ability as well as cycling performance from that of SnS2 powders. The results were analyzed and discussed with density functional theory based theoretical calculation, electrochemical impedance spectra combining diverse physicochemical techniques.