Mesoporous octahedron laminar structure as an effective host for Li-S batteries

Abstract

For seeking an appropriate host in the fields of Li-S batteries, it is significant to innovate a host which load sufficient S element. It provides a space for interaction between Li and S elements. At meanwhile, it prevents the dissolution of intermediate polysulfides. In there, we report a prominent host that are synthesized by yttria (Y₂O₃), sulfur, and Ti₃C₂T_F by the methods of hydrothermal method and ball milling method. This structure can entrap and store sulfur elements timely. By combing these merits, composite with 63.42 wt% sulfur arrive a prominent initial discharge capacitance, has 1521.056 mAh g^− 1 at 1 A g^− 1, after 1000 cycles, still has 1175.15 mAh g^− 1, In comparison to this, composite with carbon nanotubes (CNTs) offers a greater initial discharge capacitance 1750.24 mAh g^− 1, experiences with 1000 cycles, still has 1576.24 mAh g^− 1, has 0.00995% capacitance delay per cycle, keeps 90.05% retention.