Supercapacitor with high power density and high energy density and preparation method thereof

Abstract

A supercapacitor with high power density and high energy density comprises a positive pole piece and a negative pole piece, the positive pole piece and the negative pole piece are wound together, an isolating membrane is designed between the positive pole piece and the negative pole piece, the isolating membrane corresponds to the positive pole piece, and electrolyte is injected to the position between the positive pole piece and the negative pole piece. A preparation method of the supercapacitor with the high power density and the high energy density comprises the following preparation steps that active materials based on activated carbon, graphene-based active materials, conductive agents and bonding agents are mixed according to the weight ratio, and are stirred and dispersed to form even sizing agents; the sizing agents are evenly applied on the surface of a metal current collector through a casting machine or a coating die to form a conductive layer with the thickness of 1-10 microns, and an active material electrode is obtained through drying; the active material electrode is rolled and parted off on a flat press or a cold press to obtain the positive pole piece and the negative pole piece; the positive pole piece, the negative pole piece and the multi-hole isolating membrane are assembled and dried and then filled with the electrolyte, and the supercapacitor with the high power density and the high energy density is obtained through encapsulation.

Description

technical field [0001] The invention relates to a capacitor and a preparation method thereof, in particular to a supercapacitor with high power density and high energy density and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of environmentally friendly energy storage device between traditional capacitors and secondary batteries that has emerged in recent years. While retaining the characteristics of high power density of traditional capacitors, its electrostatic capacity can reach farads or even thousands of farads. , so it also has the characteristics of high energy density. At the same time, it has the advantages of fast charging and discharging speed, high charging and discharging efficiency, long life, good safety, and environmental friendliness. It is a new, practical and efficient energy storage device. [0003] Li Baohua et al. (Chinese patent, patent application number: 03134990.0) pointed out a laminated supercapacitor an...

AI Technical Summary

Problems solved by technology

However, the energy density of supercapacitors prepared by it is generally around 10Wh / kg, which cannot meet the needs of some application fields.

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