NOVELTY - A capacitor comprises a capacitor shell, an organic electrolyte arranged in the capacitor shell, and a winding core formed by isolating a positive plate from a negative plate through an ion permeability microporous membrane and winding, where the positive and negative plates are respectively connected with a positive lug and a negative lug and led out by the positive lug and the negative lug to a positive end and a negative end of the capacitor shell, and the negative plate comprises copper foil coated with negative plate active material.    USE - Capacitor for use in a lithium ion battery.    ADVANTAGE - The capacitor has high-energy density characteristic.    DETAILED DESCRIPTION - A capacitor comprises a capacitor shell, an organic electrolyte arranged in the capacitor shell, and a winding core formed by isolating a positive plate from a negative plate through an ion permeability microporous membrane and winding, where the positive and negative plates are respectively connected with a positive lug and a negative lug and led out by the positive lug and the negative lug to a positive end and a negative end of the capacitor shell, the negative plate comprises copper foil coated with negative plate active material, carboxymethyl cellulose, soluble styrene-butadiene rubber binder and super-conductive acetylene black, the positive plate comprises aluminum foil coated with positive plate active material, conductive graphite, superconductive acetylene black and polyvinylidene fluoride binder, the negativeplate active material comprises 50.0-95.0 wt.% material-A and 5.0-50.0 wt.% material-B, the material-A comprises hard carbon and soft carbon, material-B comprises natural graphite, modified graphite, artificial graphite, and the positive plate active material comprises a transition metal oxide comprising lithium manganese oxide (LiMn2O4) and (LiMnO2), lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium iron phosphate ( LiFePO4), lithium nickel cobalt oxide (LiNi(0.8)Co(0.2)O2), lithium nickel cobalt manganese oxide (LiNi(0.8)Co(0.1)Mn(0.1)O2) and (LiNi1/3Co1/3Mn1/3O2) and active carbon.