Porous carbon material and preparation method thereof, lithium-sulfur battery modified diaphragm and preparation method thereof, and lithium-sulfur battery

The invention provides a porous carbon material and a preparation method thereof, a lithium-sulfur battery modified diaphragm and a preparation method thereof, and a lithium-sulfur battery, and relates to the technical field of lithium-sulfur batteries. According to the preparation method of the porous carbon material, the colloid formed by the carbon source, the template agent and the water is coated to form the film, then the CO2 laser is adopted to carry out laser direct writing processing on the film on the substrate to prepare the porous carbon material, and the preparation method is simple in process, low in production cost, short in experimental period, simple and easy to operate and suitable for industrial production. And the prepared porous carbon material has a multi-stage pore structure and is rich in intrinsic defects. The invention also provides a lithium-sulfur battery modified diaphragm which is prepared from the porous carbon material, and due to the advantages of the porous carbon material, t