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Capacitive deionization electrode and capacitive deionization device

A capacitive deionization and electrode technology, which is applied in separation methods, dispersed particle separation, water/sludge/sewage treatment, etc., can solve the problems of weak deionization ability and high electrode contact resistance, and achieves difficult peeling, low contact resistance, The effect of prolonging the service life

Pending Publication Date: 2021-02-05
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing capacitive deionization devices have the problem of high electrode contact resistance or weak deionization ability due to purely relying on electrodes to remove ions

Method used

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  • Capacitive deionization electrode and capacitive deionization device
  • Capacitive deionization electrode and capacitive deionization device
  • Capacitive deionization electrode and capacitive deionization device

Examples

Experimental program
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Embodiment 1

[0055] In the capacitive deionization electrode of this embodiment, pure aluminum sheets are used as collector electrodes, activated carbon fibers are used as electrode active materials, polytetrafluoroethylene (PTFE) is used as a binder, and superconducting carbon black is used as a conductive agent. The thickness of the formed electrode sheet 11 is 1.0mm. The injection molding material of the flexible housing 12 is ABS plastic, and the thickness of the capacitive deionization electrode is 3.0mm (excluding the thickness of the protrusion).

[0056] The resin filling thickness of one side of the capacitive deionization electrode is 0.8-0.9mm. Both sides of the positive electrode are filled with nuclear grade cation exchange resin, and both sides of the negative electrode are filled with nuclear grade anion exchange resin.

[0057] After the resin is filled, it is covered with a water-permeable membrane, and the pore size of the water-permeable membrane is smaller than the par...

Embodiment 2

[0060] In the capacitive deionization electrode, nickel foam is used as the collector electrode, active coke powder is used as the electrode active material, polyvinylidene fluoride (PVDF) is used as the binder, and superconducting carbon black is used as the conductive agent. The thickness of the formed electrode sheet 11 is 1.0mm . The flexible shell 12 is integrally injection-molded with polypropylene (PP) plastic, the thickness of the capacitive deionization electrode is 2.5 mm (excluding the thickness of the first protrusion), and the optimized water distribution channel adopts a curved water distribution channel. The resin filling thickness of one side of the capacitive deionization electrode is 0.5-0.7 mm. In the case of large electrode surface area, in order to prevent uneven resin filling, combine Figure 5 , The surface of the electrode is provided with two opposite vertical partitions 124 to divide the surface of the electrode into three plates, and the water distr...

Embodiment 3

[0063] The capacitive deionization electrode uses stainless steel sheet as the collector electrode, activated carbon powder as the electrode active material, polyvinylidene fluoride (PVDF) as the binder, and superconducting carbon black as the conductive agent. The electrode thickness is 1.0 mm. The injection molding material of the one-piece composite electrode is polyethylene (PE) plastic, the effective thickness of the composite electrode is 2.5mm (excluding the thickness of the first protrusion), and the optimized water distribution channel adopts a curved water distribution channel. The resin filling thickness of one side of the composite electrode is 0.5-0.7mm. Both positive and negative electrodes are filled with nuclear grade cation exchange resin. After the positive electrode resin is filled, it is covered with a layer of cation exchange membrane, and after the negative electrode resin is filled, it is covered with a layer of anion exchange membrane. combine Figure...

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Abstract

The invention relates to a capacitive deionization electrode and a capacitive deionization device. The capacitive deionization electrode comprises an electrode plate, a shell, ion exchange resin and awater permeable membrane or an ion exchange membrane, wherein the upper surface and the lower surface of the contact part of the shell and the electrode plate are of grid structures; the electrode plate is packaged in the shell and clings to the upper surface and the lower surface of the shell; the upper surface and the lower surface of the shell are filled with the ion exchange resin; and the surface of the ion exchange resin is covered with the water permeable membrane or the ion exchange membrane. The capacitive deionization device comprises a plurality of th ecapacitive deionization electrodes and two plate frames, wherein positive and negative electrodes in the plurality of the capacitive deionization electrodes are alternately fixed between the two plate frames. The device can further prolong the service life of the electrodes, and strengthen the capability of removing different types of ions while ensuring low contact resistance of the electrodes.

Description

technical field [0001] The invention relates to the field of capacitive deionization, in particular to a capacitive deionization electrode and a capacitive deionization device. Background technique [0002] The electric double layer refers to the positive and negative charge distribution layer generated at the interface between two phases with different properties in aqueous solution. The directional arrangement of electrons and ions (dipoles) or charged particles occurs at the electrode / electrolyte interface, forming The charged positive and negative plates similar to the plate capacitor form the so-called electric double layer capacitor. When a low-voltage DC electric field is applied to the electrode, the electric field force will strengthen the electrode surface to adsorb charged ions or particles in the aqueous solution, thereby forming electric double layer capacitors (Electric Double Layer Capacitors, EDLCs) on the solid-liquid surface to achieve removal The purpose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
CPCC02F1/4691
Inventor 付江涛
Owner JIANGHAN UNIVERSITY