The invention discloses a preparation method and application of a two-dimensional
composite material. The preparation method comprises the following steps: adding MXene into
formamide, carrying out
ultrasonic dispersion to obtain an MXene
formamide dispersion liquid, then adding MgAl LDH into the MXene
formamide dispersion liquid, carrying out magnetic stirring, washing with absolute ethyl
alcohol, and carrying out
vacuum drying to obtain a two-dimensional
composite material which is marked as MgAl LDH / MXene. The two-dimensional
composite material is used for a
lithium-
sulfur battery diaphragm
barrier layer so as to inhibit the shuttle effect of
polysulfide. The preparation method is simple and environment-friendly, and the prepared MgAl LDH / MXene two-dimensional composite material is high in specific surface area, has strong affinity to
polysulfide, can promote rapid transmission of
lithium ions, can provide an instant
electron conduction way for adsorbed
polysulfide, is applied to a diaphragm
barrier layer of a
lithium-
sulfur battery, and has a good application prospect. The wettability of the
electrolyte on the diaphragm and the conversion of polysulfide are enhanced, the problem of
volume expansion in the cycle process of the lithium-
sulfur battery is relieved, and the
redox reaction
kinetics is accelerated.