▎ 摘　　要

NOVELTY - Composite material consisting of a uniform, monodisperse FeCoNi high-entropy alloy nanocrystals embedded in a three-dimensional, double continuous pore wall of a carbon matrix with a 3DOM (Three-Dimensionally Ordered Macroporous) structure, similar to graphene-like carbon. USE - The uniform, monodisperse FeCoNi medium-entropy alloy nano-crystalline composite material is useful in electrochemical energy storage and conversion field. ADVANTAGE - The monodisperse FeCoNi medium-entropy alloy nano-crystalline composite material has excellent lithium polysulfide catalytic conversion activity when used as a lithium modified material of sulfur battery, and can obviously improve the reversible specific capacity and multiplying power performance of the sulphur positive electrode. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the preparation method of monodisperse FeCoNi medium-entropy alloy nanocrystalline composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a (Drawing includes non-English language text).