Two-dimensional coupling: Sb nanoplates embedded in MoS2 nanosheets as efficient anode for advanced sodium ion batteries

Abstract

The development of advanced anode materials is the crucial to the enhanced performance of sodium ion batteries, which is a potential substitute to lithium ion batteries. In this work, two-dimensional coupling nanostructures with Sb nanoplates embedded ultrathin few-layered MoS2 nanosheets (MoS2/Sb) have been synthesized through a one-pot solvothermal method. The assembled sodium battery with the anode of MoS2/Sb yields a high reversible capacity of 666 mAh g−1 and 454 mAh g−1 at current densities of 0.1 A g−1 and 10 A g−1, respectively, demonstrating its good cyclicity and rate performance. The tightly embedded contact between ultrathin MoS2 nanosheets and Sb nanoplates not only improve the electronic conductivity, but accommodate the volume expansion of metallic Sb and prevent the restacking of few-layer MoS2 nanosheets. Therefore, the synergetic effects of the two dimensional nanocomponents are responsible for their excellent performance.