Asymmetric supercapacitor and preparation method thereof

The invention belongs to the field of supercapacitors, and particularly relates to an asymmetric supercapacitor monomer and a preparation method thereof. The supercapacitor comprises a positive electrode, a negative electrode and a membrane infiltrated by an electrolyte, wherein the positive electrode is a current collector to which a porous polypyrrole-carbon nanotube composite (PPy-CNT) is attached; the negative electrode is the current collector to which carbon black is attached; and the mass ratio of the porous polypyrrole-carbon nanotube composite to the carbon black is 1.1-2.3. The adopted positive capacitance and negative capacitance are not equal, so that, compared with the prior art, the asymmetric supercapacitor has the advantages that the amount of a positive electrode material is significantly increased and the amount of a negative electrode material is reduced; the advantages of a PPy-CNT porous three-dimensional structure of the positive electrode can be better developed; the disadvantage that a negative electrode carbon material is relatively poor in ion diffusion ability is weakened; the voltage of the supercapacitor is increased by over 1.5 times; and the corresponding specific energy and power density are more than doubled.