Preparation method and application of high-conductivity nano graphene colloid

The invention provides a preparation method and application of a high-conductivity nano graphene colloid. The preparation method of the high-conductivity nano graphene colloid comprises the following steps: step 1, forming a graphitized structure from a carbon source precursor in argon under a high-temperature condition and a catalytic action; 2, the graphitized structure material obtained through treatment in the step 1 is oxidized to form nano graphite oxide; step 3, forming a nano graphene material from the nano graphite oxide obtained in the step 2 in an annealing manner, and further performing high-temperature treatment to improve the conductivity; and 4, mixing the nano graphene material obtained in the step 3 with an additive, dissolving in water, and carrying out ball milling and ultrasonic dispersion treatment. The nano graphene colloid prepared by the method is outstanding in performance, good in conductivity and long in service life, and can replace other carbon-based hole metallized colloids or so