▎ 摘　　要

NOVELTY - An electrode material comprises sandwich interlayer structure of porous graphene polymer carbon nanomaterial/heteroatom-doped polymer carbon nanomaterial/porous graphene polymer carbon nanomaterial. USE - Electrode material for use in supercapacitor (claimed). ADVANTAGE - The electrode material has better electrochemical performance, and can be prepared in simple technique. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing electrode material, which involves dissolving polymer and graphene in a solvent at a mass ratio of 90:10-99: 1 to obtain a graphene/polymer spinning solution, and electrostatic spinning to obtain graphene/polymer fiber, dissolving the polymer and the heteroatom-containing substance in a solvent at a mass ratio of 100-70: 0-30 to obtain a heteroatom/polymer spinning solution, and electrostatic spinning to obtain a heteroatom/polymer fiber, where the mass of the heteroatom-containing substance is not 0, attaching the graphene/polymer fiber to the upper and lower sides of the heteroatom/polymer fiber to obtain sandwich self-supporting nanofibers, pre-oxidizing and cross-linking the sandwich self-supporting nanofibers, and carbonizing in an inert atmosphere to obtain the finished product.