▎ 摘　　要

NOVELTY - Capacitor electrode material comprises active material, conductive agent and binding agent. The active material is a sulfur-doped nanocarbon cage. The sulfur-doped nanocarbon cage has a microporous structure and a mesoporous structure. The BET specific surface area of the sulfur-doped nano carbon cage is greater than 500 m2/g. The proportion of the specific surface area in the micropores to the total specific surface area is less than 30%. The total pore volume of the sulfur-doped nanocarbon cage is greater than 1 cm3/g. The proportion of the micropore volume to the total pore volume is less than 15%. The mass percent content of carbon on the surface of the sulfur-doped nano-carbon cage is measured by X-ray photoelectron spectroscopy to be 80-98%, and the mass percent content of sulfur is 0.1-10%. USE - The capacitor electrode material is useful in a super capacitor (claimed) of an energy storage device i.e. lithium-ion battery. Can also be used for a fuel cell and electrochemical energy storage field. ADVANTAGE - The sulfur-doped nano-carbon cage contained in the electrode material has a hierarchical porous structure dominated by mesopores, which is conducive to the transport of electrolyte ions, and has a high sulfur doping amount and a large specific surface area, exhibit better capacitance performance, higher specific capacity, and higher specific capacitance in supercapacitors. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a capacitor electrode; and a preparation method of capacitor electrode.