▎ 摘　　要

NOVELTY - Preparation method of a multilayer graphene comprises adding expanded graphite to a solvent at a mass ratio of 1:1-100, uniformly stirring, and ultrasonically dispersing for 10-100 minutes at 50 Hz to 5 MHz to obtain a suspension, where the solvent is deionized water, absolute ethanol, acetone, or methylbenzene; carrying out solid-liquid separation from the suspension through filtering or centrifugal method, and collecting solvent and solid residue; and drying the solid residue at 80-150 degrees C for 30-180 minutes. USE - Method for the preparation of a multilayer graphene (claimed) used as an electrode of a battery and super capacitor; as a conductive agent of ceramic and silicate; or as a conductive agent of lithium-ion battery, alkaline battery, or nickel-metal hydride battery.