▎ 摘　　要

NOVELTY - Preparation of three-dimensional composite aerogel electrode material involves carrying out selective etching of aluminum layer using titanium-aluminum-carbon- two-dimensional inorganic compound phase, obtaining titanium-carbon- two-dimensional inorganic compound, adding lithium fluoride dissolved in hydrochloric acid solution, stirring, adding aluminum carbonitride powder, heating, stirring, dispersing in deionized water, centrifuging, obtaining delaminated two-dimensional inorganic compound suspension, dissolving cobalt salt and nickel salt in resultant, subjecting to hydrothermal reaction, centrifuging, separating, freeze-drying to obtain composite material, dispersing graphene oxide in deionized water, adding ethylenediamine and the composite material, sealing the mixture in a glass bottle, drying, obtaining three-dimensional composite hydrogel, placing in mixture of ethanol and deionized water for dialysis, and freeze-drying to obtain three-dimensional composite aerogel. USE - Preparation of three-dimensional composite aerogel electrode material. ADVANTAGE - The method enables simple and easy preparation of three-dimensional composite aerogel electrode material having excellent quality, current density of 1 A/g, specific capacitance of 2675 F/g, capacity retention rate of 87.5% after 5000 cycles, and Coulomb efficiency of 94%. DETAILED DESCRIPTION - Preparation of three-dimensional composite aerogel electrode material involves carrying out selective etching of aluminum layer using titanium-aluminum-carbon- two-dimensional inorganic compound (Ti3AlC2MXene) phase as raw material, obtaining titanium-carbon- two-dimensional inorganic compound (Ti3C2MXene), adding lithium fluoride dissolved in hydrochloric acid solution, stirring, adding aluminum carbonitride powder, heating, stirring, centrifugally washing with deionized water until pH of supernatant is close to neutral, dispersing in deionized water, ultrasonically processing with nitrogen, centrifuging, obtaining delaminated two-dimensional inorganic compound suspension, dissolving cobalt salt and nickel salt in resultant, subjecting to hydrothermal reaction, centrifuging, separating, freeze-drying to obtain composite material, dispersing graphene oxide in deionized water, adding ethylenediamine and the composite material, sealing the mixture in a glass bottle, drying, obtaining three-dimensional composite hydrogel, placing in mixture of ethanol and deionized water for dialysis, and freeze-drying to obtain three-dimensional composite aerogel.