Interlayer material for lithium-sulfur battery, and lithium-sulfur battery

An interlayer material for a lithium-sulfur battery, comprising an electrically conductive MOF modified carbon fiber paper material as the interlayer material for a lithium-sulfur battery, which is positioned between the separator and the cathode to accelerate electron transfer and have a catalytic and barrier effect on lithium polysulfides,

• wherein the electrically conductive MOF modified carbon fiber paper material comprises a hydrophilic carbon fiber paper and a metal-organic framework material Co3(HITP)2, wherein the metal-organic framework material Co3(HITP)2 is attached to the surface of carbon fibers in the hydrophilic carbon fiber paper;
• and
• the metal-organic framework material Co3(HITP)2 is in a flower-like morphology, wherein a thin pillar, a more and more sharp petal from the front part, compact petals, ordered arrangement, a length of several microns, a nano-scale width;
• and
• the conductive MOF modified carbon fiber paper material is prepared by a process comprising:
• pretreatment of carbon fiber paper, comprising:
• subjecting the carbon fiber paper material to hydrophilic treatment by soaking the carbon fiber paper in a mixture of acetone, isopropanol and water, ultrasonically treating for 30-90 min, washing and drying, to obtain a hydrophilically treated carbon fiber paper;
• preparation of carbon fiber paper grown with Co3(HITP)2, comprising:
• complexing divalent cobalt ions Co2+ and hexaiminotriphenylene on the surface of the hydrophilic carbon fiber paper, and allowing the product to grow in situ, wherein the reaction ligand HITP and a divalent cobalt salt are dissolved in a mixture of DMF and water before the reaction, the reaction temperature is 80-90° C., and the reaction time is 22-26 hrs;
• and
• removal of structural impurities, comprising:
• removing unreacted Co2+ and HITP, the solvent DMF molecule, and/or free MOF molecules on the surface of carbon fiber paper.