▎ 摘　　要

NOVELTY - Preparing electrocatalytic material comprises dissolving the first metal salt precursor and the second metal salt precursor in deionized water for reaction to obtain a precipitate, calcining the precipitate to obtain an intermediate product of a multi-metal composite material, placing intermediate product of multi-metal composite material into non-oxidizing acid for etching, adding multiple active metal nitrate for substitution reaction to obtain the electrocatalytic material in which the metal with high activity is distributed on the outer side and the metal with low activity is distributed in inner side, where the general chemical formula of the electrocatalytic material is AaBbCcOd, where A, B and C are iron, cobalt, nickel, manganese, molybdenum, tungsten, copper, zinc, niobium, tin, magnesium, aluminum or vanadium, where a = 0-3, b = 0-5, c = 0-3, d = 0-5. USE - The method is useful for preparing electrocatalytic material. ADVANTAGE - The material: increases active catalytic sites on the surface of the material; adsorbs lithium-phosphorus-sulfur; catalyzes its conversion to dilithium sulfide; inhibits lithium-phosphorus-sulfur shuttle; realizes high lithium-phosphorus-sulfur utilization rate; and obtains high gram capacity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: an electrocatalytic material prepared by the above-mentioned method; and an isolation film, comprising a substrate and a modified layer coated on at least one side surface of the substrate, where the modified layer comprises electrocatalytic material and further comprises conductive agent, binder and solvent; and a lithium-sulfur battery, comprising isolating film.