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Capacitive deionization electrode, preparation method thereof and capacitive deionization device

A technology of capacitive deionization and electrodes, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of increasing the processing difficulty of CDI devices, achieve the effects of reducing common ion repulsion, enhancing toughness, and enhancing desalination effects Effect

Inactive Publication Date: 2020-08-04
SHANGHAI DINGXIANG ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the use of ion-exchange membranes can effectively avoid side reactions, the use of ion-exchange membranes will increase the processing difficulty of CDI devices

Method used

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  • Capacitive deionization electrode, preparation method thereof and capacitive deionization device
  • Capacitive deionization electrode, preparation method thereof and capacitive deionization device
  • Capacitive deionization electrode, preparation method thereof and capacitive deionization device

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preparation example Construction

[0056] The present invention also provides a preparation method of a capacitive deionization electrode, comprising the following steps:

[0057] S1: Preparation of the substrate electrode:

[0058] Mixing the carbon material with a conductive agent and a binder to obtain an electrode slurry, coating the electrode slurry on a current collector, and drying in a vacuum to obtain a base electrode;

[0059] Specifically, the mass ratio of the active components of the carbon material in the electrode slurry is greater than or equal to 90%;

[0060] Further, the mass ratio of conductive agent and adhesive is 1:1;

[0061] Specifically, the carbon material is selected from any one of activated carbon, graphene, carbon fiber, and carbon tube, but not limited thereto, and the carbon material is selected from a carbon material with a large specific surface area, developed pores, and good hydrophilicity;

[0062] S2: Preparation of positive electrode:

[0063] After defoaming the scrap...

Embodiment 1

[0081] This embodiment provides a method for preparing a long-life, high-efficiency capacitive deionization electrode, which specifically includes the following steps:

[0082] (1) Preparation of the base electrode

[0083] The active carbon material, conductive carbon black, and polyvinylidene fluoride are uniformly mixed at a mass ratio of 90:5:5 to obtain an electrode slurry, which is then uniformly coated on graphite paper and dried under vacuum at 80°C to obtain the electrode slurry. Base electrodes on the positive and negative electrodes.

[0084] (2) Preparation of positive electrode

[0085] The dry chloroacetylated polyphenylene ether was dissolved in N,N-dimethylformamide to form a scraping solution with a mass fraction of 15%, and then moved into a vacuum oven to stand for defoaming. Evenly scrape the defoamed scraping solution on the activated carbon material side of the base electrode, let it stand at room temperature for 24 hours, then move it into a vacuum ove...

Embodiment 2

[0089] This embodiment provides a method for preparing a long-life, high-efficiency capacitive deionization electrode, which specifically includes the following steps:

[0090] (1) Preparation of the base electrode

[0091] The active carbon material, conductive carbon black, and polyvinylidene fluoride are uniformly mixed at a mass ratio of 90:5:5 to obtain an electrode slurry, which is then uniformly coated on graphite paper and dried under vacuum at 80°C to obtain the electrode slurry. Base electrodes on the positive and negative electrodes.

[0092] (2) Preparation of positive electrode

[0093]Dissolve dry chloroacetylated polyphenylene ether and brominated poly(2,6-dimethyl-1,4-polyphenylene ether) in N,N-dimethylformamide at a mass ratio of 3:7 to form The scraping solution with a mass fraction of 15% was then moved into a vacuum oven to stand still for degassing. Evenly scrape the defoamed scraping solution on the activated carbon material side of the base electrode...

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Abstract

The invention discloses a capacitive deionization electrode, a preparation method thereof and a capacitive deionization device. According to the electrode, graphite paper serves as a current collector, and an activated carbon material serves as an electrode material; wherein the surface of the positive electrode material is covered with a layer of anion exchange polymer, the surface of the negative electrode material is covered with a layer of cation exchange polymer, and the preparation method comprises the following steps: S1, mixing an activated carbon material with a conductive agent and abinder to obtain electrode slurry, then coating graphite paper with the electrode slurry, and drying to obtain a substrate electrode; S2, defoaming the membrane scraping liquid containing the anion exchange polymer, coating one surface of the activated carbon material of the substrate electrode with the membrane scraping liquid in a scraping manner, forming a membrane, and modifying to obtain a positive electrode; and S3, defoaming the membrane scraping liquid containing the cation exchange polymer, coating one surface of the activated carbon material of the substrate electrode with the membrane scraping liquid in a scraping manner, and performing modification after membrane formation to obtain the negative electrode. The electrode provided by the invention not only can effectively inhibit the occurrence of side reactions and improve the desalination effect, but also has enhanced toughness.

Description

technical field [0001] The invention belongs to the technical field of capacitive deionization, and in particular relates to a capacitive deionization electrode, a preparation method thereof and a capacitive deionization device. Background technique [0002] As a new desalination technology with high energy efficiency, low cost and excellent water recovery rate, capacitive deionization (CDI) has aroused great research interest, and great breakthroughs have been made in related research. However, unlike supercapacitors that are also based on the Electric Double Lays (EDLs) theory, the CDI system faces more complicated conditions, mainly because the CDI operating system is open, the concentration of the electrolyte (brine to be treated) is low, The system components are complex, especially the untreated brine entering the CDI system contains not only electrolytes, but also impurities such as organic matter and dissolved oxygen. The complex operating system makes CDI desalinat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
CPCC02F1/4691
Inventor 张滨义
Owner SHANGHAI DINGXIANG ENVIROTECH CO LTD
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