Method for dispersing complex conducting agent in electrode slurry for lithium ion capacitor

Abstract

The invention discloses a method for dispersing a complex conducting agent in an electrode slurry for a lithium ion capacitor. The method comprises the following steps: (1) material weighing: weighing 0.5-14.5% of graphene, 5.5-14.5% of a carbon nano tube and the balance of conducting carbon black, weighing N-methylpyrrolidone which is 4-9 times of the mass of the complex conducting agent, and weighing a surfactant which accounts for 5-15% of the mass of the complex conducting agent, wherein the grapheme, the carbon nano tube and the conducting carbon black constitute the complex conducting agent, and all the materials are weighed for standby application; (2) step-by-step material adding for dispersion: mixing the complex conducting agent with N-methyl-pyrrolidone and the surfactant for ultrasonic dispersion firstly, adding the carbon nano tube for first high-speed dispersion secondly, and adding the grapheme for second high-speed dispersion finally. The method is simple in process sequence, high in operability, and suitable for industrialized production, and has the advantages that the complex conducting agent can uniformly disperse to form a three-dimensional conducting network structure, and the power performance can be obviously improved when the relatively high energy density of capacitance is retained.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a method for dispersing a composite conductive agent in a lithium ion capacitor electrode slurry. Background technique [0002] Supercapacitors have attracted widespread attention in the industry because of their advantages such as high power, long service life, and fast charging speed. However, the electrode materials of conventional supercapacitor electrodes are usually made of carbon-based active materials (such as activated carbon) and binders. The defects of low voltage and low energy density limit the application in many aspects. Therefore, in order to increase the voltage and energy density of supercapacitors, lithium-containing materials are doped into carbon-based active materials during the preparation of existing supercapacitor electrode sheets. [0003] However, the electronic conductivity of lithium-containing materials is relatively low, so it is necessary ...

AI Technical Summary

Problems solved by technology

[0006] The present invention is to solve the problem that the conductive agent in the lithium ion capacitor electrode slurry is not easy to disperse and cannot effectively form a conductive network structure in the prior art, and provides a method for dispersing the composite conductive agent in the lithium ion capacitor electrode slurry. The invention has simple process steps, strong operability, and is suitable for industrial production. It can evenly disperse the composite conductive agent and form a three-dimensional conductive network structure. While maintaining a high specific energy of the capacitance, the power performance is significantly improved.