Interlayer-expanded VMo2S4 nanosheets on RGO for high and fast lithium and sodium storage.

Abstract MoS 2 shows promising potential in the application of lithium ion batteries (LIBs) or sodium ion batteries (SIBs), however, suffering from the sluggish kinetics and terrible volume expansion. Here we fabricate interlayer-expanded VMo 2 S 4 nanosheets onto RGO and exhibit excellent electrochemical properties for lithium and sodium storage. The 2D nature and interlayer-expanded feature assure the shortened ion transfer path and improved diffusion kinetics. RGO substrates enhance the electric conductivity and preserve the material integrity. Based on such benefits, the present sample serves as advanced anode for both LIBs and SIBs, delivering reversible capacities of 1081 mAh g−1 for LIBs and 254 mAh g−1 for SIBs after 200 cycles at 1 A g−1. Graphical abstract Image 1 Highlights • Interlayer-expanded VMo 2 S 4 nanosheets on RGO are developed. • V dopants induce enlarged interlayer and synergism between V and Mo. • RGO improves conductivity and buffers the volume variation. • 2D feature shortens ion diffusion path. • High and fast lithium/sodium storage are obtained. [ABSTRACT FROM AUTHOR]