▎ 摘　　要

NOVELTY - The method for in-situ preparation of oxygen deficient metal oxide catalyst, comprises (i) preparing a precursor solution comprising graphene oxide, one-dimensional carbon material, adjusting ion source and doping source, (ii) using the precursor solution for hydrothermal reaction, and drying hydrothermal product, and (iii) primary calcining under protective gas atmosphere, and then carrying out secondary calcining in the atmosphere containing reducing gas to obtain the catalyst. USE - Method for in-situ preparation of oxygen deficient metal oxide catalyst used for positive electrode active material for lithium-sulfur battery used in large energy storage device and power grid such as electric vehicle. ADVANTAGE - The method uses the excellent conductivity and large specific surface area of the one-dimensional carbon material and the oxidation, graphene, in the hydrothermal process preparation the ion control defect metal porous function doped nano-carbon carrier, by one time calcining improves the conductivity of the carbon carrier, secondary calcining to obtain the metal oxide rich in oxygen defect. The metal oxide is uniformly dispersed on the high-conductivity porous the doped nanometer carbon carrier. It is applied to the lithium sulphur battery to realize the efficient utilization of sulphur positive electrode high energy density and long cycle life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a catalyst comprising a three-dimensional porous nanocomposite carbon doped with nitrogen and/or sulfur, and an oxygen-deficient metal oxide supported on the three-dimensional porous nanocomposite carbon; (2) positive electrode active material comprising nano sulfur loaded on the catalyst; and (3) a lithium sulfur battery.