▎ 摘　　要

NOVELTY - Preparing graphene-carbon nanofiber composite electrode materials by rapid high-temperature flame method, comprises freeze-drying the bacterial cellulose film at a certain temperature to obtain freeze-dried bacterial cellulose, carbonizing the freeze-dried bacterial cellulose in an inert atmosphere to obtain carbon nanofiber, ultrasonically mixing the graphene oxide dispersion prepared by the modified hummer method and carbon nanofibers and pouring into an iron pan to freeze-dry, quickly moving the graphene oxide-carbon nanofiber powder with a uniform thickness and reducing at a certain speed with a flame spray gun outer flame in an iron plate to obtain a graphene-carbon nanofiber composite electrode material, where the temperature of the outer flame of the flame spray gun is 800-2500℃, and the moving speed is 0.1-5 m/second. USE - The graphene-carbon nanofiber composite electrode material is useful in lithium-ion capacitor (claimed). ADVANTAGE - The electrode material has high specific capacity of 120, 1580 mAh/g and excellent cycle performance and super-high rate performance, and can reach high energy density of 245 Wh K kg-1, and high power density of 49.5 kW K kg-1. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: graphene-carbon nanofiber composite electrode material; and lithium-ion capacitor.