Enhanced Lithium Storage Performances of Hierarchical Hollow MoS₂ Nanoparticles Assembled from Nanosheets

Abstract

MoS₂, because of its layered structure and high theoretical capacity, has been regarded as a potential candidate for electrode materials in lithium secondary batteries. But it suffers from the poor cycling stability and low rate capability. Here, hierarchical hollow nanoparticles of MoS₂ nanosheets with an increased interlayer distance are synthesized by a simple solvothermal reaction at a low temperature. The formation of hierarchical hollow nanoparticles is based on the intermediate, K₂NaMoO₃F₃, as a self-sacrificed template. These hollow nanoparticles exhibit a reversible capacity of 902 mA h g^–1 at 100 mA g^–1 after 80 cycles, much higher than the solid counterpart. At a current density of 1000 mA g^–1, the reversible capacity of the hierarchical hollow nanoparticles could be still maintained at 780 mAh g^–1. The enhanced lithium storage performances of the hierarchical hollow nanoparticles in reversible capacities, cycling stability and rate performances can be attributed to their hierarchical surface, hollow structure feature and increased layer distance of S–Mo–S. Hierarchical hollow nanoparticles as an ensemble of these features, could be applied to other electrode materials for the superior electrochemical performance