▎ 摘　　要

NOVELTY - A modified separator comprises membrane substrate and sheet-like polar barrier layer composed of composite of nickel cobaltate and reduced graphene oxide. The nickel cobaltate nanoparticles are attached to the surface of the flaky reduced graphene oxide. The mass ratio of the nickel cobaltate to the reduced graphene oxide is (2.5-3):1. USE - Modified separator used in lithium-sulfur battery. ADVANTAGE - The modified separator has a three-dimensional porous structure which increases the specific surface area and loading of the sulfur powder, blocks the shuttle of the polysulfide and improves the conductivity without affecting the normal transmission of lithium ions. While maintaining its own polarity, modified separator can maintain mechanical properties and has stable and firm contact with ordinary diaphragms. The modified separator is difficult to fall off in electrochemical reactions, and is economical. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of modified separator.