PREPARATION METHOD FOR LITHIUM-SULFUR BATTERY BASED ON LARGE-AREA THICK- FILM CONTROLLABLE TEXTURED PHOTONIC CRYSTAL

Disclosed is a preparation method for a lithium-sulfur battery based on a large-area thick-film controllable textured photonic crystal. With a vertical deposition self-assembly method, as a solvent volatilizes, monodisperse microspheres are arranged in macropores of a substrate to form a photonic crystal structure; with the photonic crystal as a template, ordered microporous carbon is synthesized in gaps of the template, and then the photonic crystal template is removed to obtain a three-dimensional ordered hierarchical porous carbon photonic crystal, and thus a large-area thick-film controllable textured photonic crystal is formed. The large-area thick-film controllable textured photonic crystal is composited with element sulphur to obtain a sulphur cathode, and the sulphur cathode and metal lithium serving as a counter electrode are assembled into a lithium-sulphur battery. According to the invention, the controllable thick film with an electrode thickness of 10 μm to 650 μm can be achieved by changing the thickness of the substrate and the concentration of a suspension liquid. In the meanwhile, large-area preparation with an electrode area of 0.1 cmto 400 cmcan be achieved by changing the area of the substrate. In addition, a high sulfur load of 1 mg·cmto 15 mg·cmcan be achieved by adjusting the concentration of an organic solution of sulfur, thereby achieving a high surface capacity density and a high surface energy density of the lithium-sulfur battery.