▎ 摘　　要

NOVELTY - A conductive agent preparation method involves directly cutting graphene microsheet by mechanical shearing machine, peeling and obtaining exfoliated graphene nanosheet. The exfoliated graphene nanosheet is heated. The heated graphene nanosheet is quenched by using liquid nitrogen to morphologically transform the graphene nanosheet to graphene having curved sheet structure followed by obtaining fine spherical particles dispersed in emulsion, processing in calcining furnace, arranging catalytic plate in the furnace, suspension calcining and obtaining spherical particles. USE - Method for preparing conductive agent in folded form that is utilized for lithium-ion battery. ADVANTAGE - The method enables preparing conductive agent with suitability for lithium-ion battery having special appearance structure, easy dispersibility in lithium-ion battery active material and excellent electrical conductivity and lithium ion transport properties by obtaining conductive agent in form of spherical particles having particle diameter of 10-20 mu m, providing transmission channel for lithium-ions in a rapid manner, substantially increasing capacity of the lithium-ion battery, reducing internal resistance of the battery and enhancing cycle performance of the battery. DETAILED DESCRIPTION - A conductive agent preparation method involves directly cutting graphene microsheet by mechanical shearing machine, peeling and obtaining exfoliated graphene nanosheet. The exfoliated graphene nanosheet is heated to more than 300 degrees C. The heated graphene nanosheet is quenched by using liquid nitrogen to morphologically transform the graphene nanosheet to graphene having curved sheet structure. The graphene having curved sheet structure is dispersed and emulsified in dispersion system with soluble carbon source, such that the graphene is dispersed at a speed of 2000-2500 revolutions per minute for 30-60 minutes followed by adding flocculating agent and reducing dispersion speed to 800-1000 revolutions per minute. The graphene having curved sheet structure is aggregated and assembled with the soluble carbon source under action of the flocculating agent to obtain fine spherical particles dispersed in emulsion. The emulsion is filtered, such that dispersed product is filtered off followed by processing in calcining furnace at 400-500 degrees C, arranging catalytic plate in the furnace, suspension calcining for 10-25 minutes in presence of flow of nitrogen gas, such that the soluble carbon source and the flocculating agent is reduced to graphite and the graphene having curved sheet structure is bonded in situ during reduction of the soluble carbon source and obtaining spherical particles, where the soluble carbon source is chitosan, cellulose ethers and their derivatives, xanthan gum, gum Arabic and seaweed glue and the flocculating agent is polyacrylamide and poly(diallyldimethylammonium chloride), the obtained spherical particles are conductive agent which is in folded form (surface is corrugated) and the catalytic plate is iron plate, copper plate or nickel plate. An INDEPENDENT CLAIM is also included for a conductive agent in folded form prepared by the method.