Rationally\nIncorporated MoS₂/SnS₂ Nanoparticles on Graphene\nSheets for Lithium-Ion and Sodium-Ion Batteries

Abstract

Herein,\nwe have designed and first synthesized a unique ternary hybrid structure\nby simultaneously growing SnS₂ and MoS₂ particles\non graphene sheets (denoted as MoS₂/SnS₂-GS)\nvia one-pot hydrothermal route. The charge incompatibility between\nMoO₄^2– and graphene oxide with negative\ncharged functional groups on surface can be compromised with the aid\nof Sn⁴⁺ cations, which renders the final formation of SnS₂ and MoS₂ on GS surface. This is the first report\nof the cohybridization of MoS₂ and SnS₂ with\nGS matrix from anionic and cationic precursors in the absence of premedication\nof graphene surface. When MoS₂/SnS₂-GS acts\nas anodes for lithium-ion batteries, the hybrids exhibit much better\ncycling stability than MoS₂-GS and SnS₂-GS counterparts.\nThe compact adhesion of MoS₂/SnS₂ nanoparticles\nhelps offset the undesired result of destruction of electrode materials\nresulting from volume expansion during repeated cycles. Furthermore,\nby combination with their synergetic effect on interface and the presence\nof discrepant asynchronous electrochemical reactions for SnS₂ and MoS₂, MoS₂/SnS₂-GS hybrids\nare endowed with improvement of electrochemical capabilities. Besides,\nthey also showed outstanding Na-storage ability.