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

A composite conductive agent and capacitor electrode technology, which is applied in the directions of hybrid capacitor electrodes, capacitors, electrolytic capacitors, etc., can solve problems such as the inability to effectively form a conductive network structure, and the conductive agent is not easily dispersed, and achieves low cost, improved conductivity, and dispersion effects. Good results

Active Publication Date: 2015-05-27
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weighing: Weigh each component according to the ratio of 0.5% graphene, 5.5% carbon nanotubes with a diameter of 50nm, and the balance of conductive carbon black with a particle size of 10nm. Among them, graphene, carbon nanotubes and Conductive carbon black constitutes a composite conductive agent, and simultaneously weigh N-methylpyrrolidone that is 4 times the quality of the composite conductive agent and a surfactant that is 5% of the composite conductive agent quality, and stand-by, wherein the surfactant is linolenic acid.

[0025] (2) Step-by-step feeding and dispersion: firstly mix conductive carbon black with N-methylpyrrolidone and surfactant, then ultrasonically disperse for 20min under the condition of frequency 15KHz and power 200W, and inject hydrogen into the feed liquid every 1min during ultrasonic dispersion , each time the hydrogen gas is injected for 5S, the amount of hydrogen injected is 0.3m 3 / h, followed by adding carbon nanotubes and carrying...

Embodiment 2

[0027] (1) Weighing: Weigh each component according to the ratio of 14.5% graphene, 14.5% carbon nanotubes with a diameter of 100nm, and the balance of conductive carbon black with a particle size of 50nm. Among them, graphene, carbon nanotubes and Conductive carbon black constitutes a composite conductive agent, and simultaneously takes by weighing N-methylpyrrolidone that is 9 times the quality of the composite conductive agent and a surfactant that is 15% of the composite conductive agent quality, stand-by, wherein the surfactant is hexadecyl Trimethylammonium bromide, stearic acid, and sodium lauryl sulfate are mixed in a mass ratio of 1:1:1.

[0028] (2) Step-by-step feeding and dispersion: firstly mix conductive carbon black with N-methylpyrrolidone and surfactant, then ultrasonically disperse for 30min under the condition of frequency 20KHz and power 300W, and inject hydrogen into the feed liquid every 3min during ultrasonic dispersion , each time the hydrogen gas is in...

Embodiment 3

[0030] (1) Weighing: Weigh each component according to the ratio of 10% graphene, 12% carbon nanotubes with a diameter of 60nm, and the balance of conductive carbon black with a particle size of 20nm. Among them, graphene, carbon nanotubes and conductive carbon black Carbon black constitutes a composite conductive agent, and simultaneously takes by weighing N-methylpyrrolidone that is 7 times the quality of the composite conductive agent and a surfactant that is 10% of the composite conductive agent quality, stand-by, wherein the surfactant is linolenic acid, cetyl One or more of alkyltrimethylammonium bromide, stearic acid, sodium lauryl sulfate, sodium dodecylbenzenesulfonate;

[0031] (2) Step-by-step feeding and dispersion: firstly mix the conductive carbon black with N-methylpyrrolidone and surfactant, then ultrasonically disperse for 25min under the condition of frequency 18KHz and power 250W, and inject hydrogen into the feed liquid every 2min during ultrasonic dispersio...

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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 ...

Claims

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Application Information

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IPC IPC(8): H01G9/042
CPCH01G11/38H01G11/50H01G11/86Y02E60/13
Inventor 阮殿波黄益傅冠生
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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