LITHIUM-SULFUR BATTERY SEPARATOR AND PREPARATION METHOD THEREFOR, LITHIUM-SULFUR BATTERY AND ELECTRONIC DEVICE

摘要

The application provides a lithium-sulfur battery separator, a preparation method therefor, a lithium-sulfur battery and an electronic device, relating to the technical field of lithium-sulfur batteries. The lithium-sulfur battery separator comprises a separator substrate and a boron-doped diamond composite material layer formed on the surface of the separator substrate, wherein the boron-doped diamond composite material layer has a large number of active sites on the surface thereof and is electrically conductive, so as to absorb the intermediate product of a lithium-sulfur battery electrode reaction, i.e., polysulfide, to prevent the same from dissolving in an electrolyte solution; and accordingly to cause the sulfur to release more energy. The boron-doped diamond composite material layer can also conduct electrons, such that the intermediate product adsorbed thereon is further converted into the final product. Thus, the lithium-sulfur battery separator can effectively improve the mass specific capacity and cycle characteristics of lithium-sulfur batteries. The application also provides a method for preparing a lithium-sulfur battery separator. The method is a simple process, easy to operate, and is suitable for industrial production. The present application further provides a lithium-sulfur battery comprising the lithium-sulfur battery separator. The lithium-sulfur battery has a high mass specific capacity and excellent cycle characteristics.