▎ 摘　　要

NOVELTY - Preparing titanium nitride/graphene composite material involves perform high-temperature thermal expansion of expanded graphite to obtain graphite worms, then dispersing graphite worms in deionized water, and sequentially perform shearing and high-pressure homogenization to obtain graphene slurry, dispersing commercial titanium nitride in a mixture of deionized water and ethanol to obtain titanium nitride suspension, which is placed in ultrasonic tank and sonicated with a cell ultrasonic disruptor for a period of time, and centrifuging supernatant and drying it to obtain yellow-brown titanium nitride nanoparticle powder. The titanium nitride nanoparticle powder is taken and dispersed it in diluted graphene slurry, stirred uniformly to obtain a mixed suspension, and put mixed suspension with a magnetic stirrer into a polytetrafluoroethylene reactor equipped with a microwave reactor for microwave reaction. The titanium nitride/graphene composite material is obtained by drying product. USE - Method for preparing titanium nitride/graphene composite material used in lithium ion capacitor (claimed). ADVANTAGE - The method enables to prepare titanium nitride/graphene composite material which provide electrode material with low impedance, high specific capacity and high rate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an application of the titanium nitride/graphene composite material in the lithium ion capacitor, which involves: (A) adding the electrode active material, conductive agent, and binder to the dispersant at a mass ratio of 8:1:1, grind and mixing them into a slurry, coat them uniformly on the positive and negative current collectors, and drying to obtain positive and negative plates, where electrode active material is a titanium nitride/graphene composite material, the positive electrode current collector is aluminum foil, the negative electrode current collector is copper foil, the conductive agent is conductive carbon black, and the binder is polytetrafluoroethylene or polyvinylidene fluoride, and agent is N-methylpyrrolidone; and (B) putting the positive electrode sheet, the separator and the negative electrode sheet into the battery case in sequence, inject the electrolyte to obtain a lithium ion capacitor, after sealing, where electrolyte is a 1,3-dioxolane-ethylene glycol dimethyl ether solution of 1 mol/L lithium hexafluorophosphate, that is, DOL-DME solution, and the volume ratio of DOL and DME is 1:1.