▎ 摘　　要

NOVELTY - A nano-nickel cobaltite/reduced graphene oxide/aramid nanofiber composite film preparing method involves adding graphene oxide to water and dispersing by ultrasound to obtain a solid, uniform black liquid without solid particles. Nickel salt, cobalt salt, cetrimonium bromide and ammonium fluoride are dissolved in water and stirred to obtain a uniform reddish solution. The black liquid and uniform reddish solution are mixed, stirred well and hydrothermal reaction is performed. The solid product is separated by suction filtration, washed and dried to obtain nano-nickel cobaltite/graphene oxide, which is added to dimethyl sulfoxide and ultrasonically dispersed to obtain a first uniform black solution without solid particles. The first black solution, aramid nanofiber solution and graphene oxide solution are mixed and stirred to obtain a second uniform black solution. The second black solution is vacuum-filtered, assembled layer by layer and hot-pressed to obtain the desired product. USE - Method for preparing a nano-nickel cobaltite/reduced graphene oxide/aramid nanofiber composite film for electrode material of a self-supporting supercapacitor (claimed). ADVANTAGE - The method enables preparing the composite film with high mechanical properties and energy storage performance, in simple manner.