Metal organic framework composite material for battery diaphragm as well as preparation method and application of metal organic framework composite material

The invention belongs to the technical field of electrochemical materials, and particularly relates to a metal organic framework/graphene composite material for a battery diaphragm as well as a preparation method and application of the metal organic framework/graphene composite material. The invention discloses a (PCN-224)/graphene (graphene) composite material and a preparation method thereof. The composite material has many advantages in the aspect of inhibiting the shuttle effect: the hierarchical pore structure of PCN-224 can physically limit the movement of lithium polysulfide dissolved in an electrolyte; a zirconium metal site in the PCN-224 can be used for chemically adsorbing lithium polysulfide; a porphyrin ring structure in the PCN-224 has a catalytic acceleration effect on polysulfide conversion; the high conductivity of the graphene is beneficial for improving the conversion rate of sulfur. The PCN-224/Graphene composite material is used for modifying a diaphragm of a lithium-sulfur battery, so th