Pole piece of supercapacitor and production method for pole piece

Abstract

The invention belongs to the technical field of supercapacitors, and particularly relates to a production method for a pole piece of a supercapacitor with low N-methyl pyrrolidone content. The production method comprises the following steps of: dissolving active carbon, conductive carbon and adhesive in N-methyl pyrrolidone in a certain proportion to form slurry; coating the slurry on a current collector, and cold-pressing the current collector to form the pole piece to be treated; and putting the pole piece to be treated in a container filled with deionized water, subjecting the pole piece to be processed to ultrasonic treatment, and drying the pole piece to be processed to obtain the pole piece of the supercapacitor. Compared with the prior art, direct inflow function of ultrasonic wave is utilized in the invention, so that salvation of the deionized water and NMP (N-methyl pyrrolidone) in pores and micropores of the active carbon in the pole piece, and therefore the problem of poor infiltration in the deionized water of the pole piece is solved, and a good effect is achieved. The production method is simple to operate, only needs the ultrasonic treatment at the same time of soaking, and is beneficial for practical production, and moreover operation time is reduced. In addition, the invention also discloses the pole piece of the supercapacitor produced by the method.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a pole piece of a supercapacitor with low N-methylpyrrolidone content and a manufacturing method thereof. Background technique [0002] As an energy storage device, a supercapacitor has the characteristics of high charge and discharge rate, good safety, excellent cycle performance, and low performance attenuation during long-term storage. It is especially suitable for high-power occasions, such as energy recovery when hybrid vehicles brake, Vehicle start and acceleration etc. [0003] Electric double layer capacitors are the most popular type of supercapacitors on the market today. From the perspective of composition, a supercapacitor includes polarizable electrodes, a diaphragm, an electrolyte, and a package. Among them, the electrode is the most important part. The electrode determines the performance of the supercapacitor, and the impurity content in the ...

AI Technical Summary

Problems solved by technology

The low boiling point solvent that this method uses is divided into two classes, and a class is organic matter such as alcohols, ethers, ketones, because the characteristics of the low boiling point of these organic matter, in actual operation (50~100 ℃ immersion solvent and 100~150 ℃ oven drying) will form a large amount of flammable steam, which will cause safety hazards and is not conducive to actual production; another type of low boiling point solvent is water. Although water is not an organic solvent, the steam formed is not flammable, but due to the The active material used is activated carbon, which is characterized by a large specific surface area (up to about 2000m2 / g), rich mesopore and micropore structure, NMP generally penetrates into these mesopores and micropores, and water solvent only penetrates into Only in these mesopores and micropores can NMP be removed, but the adhesive used for the pole piece is generally a non-hydrophilic substance such as PVDF. If the pole piece is soaked in water, there will be a problem of poor infiltration, which makes it difficult for water It enters the micropores of activated carbon on the pole piece and dissolves with water, so it is not easy to remove NMP in the micropores of activated carbon