Preparation method of lithium-sulfur thin film battery nano composite positive electrode material

The invention relates to a preparation method of a lithium-sulfur thin film battery nano composite positive electrode material. The preparation method aims to solve the problems of the shuttle effectcaused by dissolution of lithium polysulfide generated during the discharge process of a lithium-sulfur battery positive electrode material, fast capacity attenuation, low specific capacity and the like. The preparation method comprises the steps of: 1, drying pretreatment of raw materials; 2, mixing of sulfur simple substance and nano metallic oxide; 3, grinding pretreatment of a precursor; 4, preparation of a nano metallic oxide-sulfur composite material; 5, and preparation of the lithium-sulfur thin film battery nano composite positive electrode material. The coulombic efficiency of a battery assembled by means of the lithium-sulfur thin film battery nano composite positive electrode material prepared by adopting the preparation method can be up to 95% or more, and the electrode can beapplied to a solid-state e