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Electrode, method for producing same, and flow-through capacitor including same

A manufacturing method and flow-through technology, applied in the manufacture of hybrid/electric double layer capacitors, chemical instruments and methods, magnetic field/electric field water/sewage treatment, etc., can solve the problem of low introduction of sulfonic acid groups and low resistance to alkaline chemicals , Insufficient current efficiency of flow-through capacitors, etc., to achieve the effects of small resistance, excellent film strength, and excellent ion selective permeability

Inactive Publication Date: 2015-07-22
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the flow-through capacitors described in Patent Documents 1 and 2 have a problem that in the desalination process, secondary ions (ions having the same sign as the charge on the electrode) adsorbed on the electrode hinder the counter-ion that should be adsorbed originally. Problems such as adsorption of ions (ions having a charge opposite to that of the electrode), problems such as desorption and release of side ions to the outside of the electrode, and mixing into desalted water, resulting in a decrease in current efficiency
In addition, there is a problem that in the electrode cleaning process, the ions desorbed from the electrodes by reversing the connection of the DC power supply are re-adsorbed to the electrodes having the opposite sign to the charges of the ions, and the electrodes are contaminated.
However, ester bonds have low resistance to alkaline chemicals
Therefore, there is a problem that it is difficult to clean when dirt is attached to the surface of the electrode.
In addition, there is also a problem that the amount of sulfonic acid groups introduced is small.
In addition, the current efficiency of the flow-through capacitor is not sufficient

Method used

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  • Electrode, method for producing same, and flow-through capacitor including same
  • Electrode, method for producing same, and flow-through capacitor including same
  • Electrode, method for producing same, and flow-through capacitor including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171] Fabrication of Electrode-1

[0172] (Preparation of aqueous solution of ionic block copolymer)

[0173] A 10% aqueous solution was prepared by adding the required amount of deionized water to the cationic block copolymer (P1'):P-1. The viscosity at 25° C. of the obtained aqueous solution was measured with a B-type viscometer (manufactured by Tokimi Co., Ltd.), and it was 650 mPa·s.

[0174] (Preparation of slurry containing carbon material)

[0175] Activated carbon (BET adsorption area: 1800m 2 / g), conductive carbon black, carboxymethyl cellulose, and water were mixed in a weight ratio of 100:5:1.5:140 and then kneaded. 20 parts by weight of water and 15 parts by weight of a water-based SBR emulsion binder (solid content ratio: 40% by weight) were added to 100 parts by weight of the obtained block kneaded product, and kneaded to obtain a solid content The ratio is 36% activated carbon slurry. The viscosity at a temperature of 25° C. of the obtained slurry was measu...

Embodiment 2～9、11～19 and 21 and comparative example 1

[0182] Preparation of electrodes-2~9, 11, 12, 13~20 and 22

[0183] In addition to changing the type of vinyl alcohol copolymer and the thickness of the ion exchange layer, the BET adsorption surface area and thickness of the activated carbon used in the slurry containing the carbon material, and the heat treatment temperature to the contents shown in Tables 5 and 6, the same as the implementation Electrodes were fabricated in the same manner as in Example 1. The surface of each obtained electrode was visually observed. Next, the measurement of the electrode resistance, the alkali resistance test and the interface adhesiveness test were carried out according to the above-mentioned method. These results are shown in Table 5 and Table 6.

Embodiment 10

[0185] Fabrication of Electrode-10

[0186] (Preparation of aqueous solution of ionic block copolymer and electrode layer slurry containing carbon material)

[0187] An aqueous solution of a cationic block copolymer (P1'):P-3 and a slurry containing a carbon material were prepared in the same manner as in Example 3.

[0188] (Fabrication of ion-exchange layer-integrated electrodes)

[0189] The slurry containing the carbon material was coated on an expanded graphite sheet (thickness: 250 μm) manufactured by Melsen Effemue Co., Ltd. as a current collector layer using a coating bar (coating width: 10 cm). Next, the P-3 aqueous solution was apply|coated using the coating bar (coating width: 14 cm) on the said slurry layer which did not carry out a drying process. Then, it dried at the temperature of 90 degreeC for 10 minutes with the hot air dryer "DKM400" (made by Yamato). Observation of the cross-section of the obtained laminate with a scanning electron microscope "S-3000" (...

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Abstract

The present invention provides an electrode comprising a current collector layer, a porous electrode layer and an ion exchange layer which are arranged in this order, wherein the ion exchange layer contains a vinyl alcohol copolymer (P) copolymerized with 0.1 to 50 mol% of a monomer having an ionic group and the porous electrode layer contains a carbon material. This electrode has a low electrode resistance, and, therefore, is useful as an electrode for a flow-through capacitor.

Description

technical field [0001] The present invention relates to an electrode having a current collector layer, a porous electrode layer and an ion exchange layer and a method for manufacturing the same. In addition, the invention relates to flow-through capacitors having such electrodes. Furthermore, the present invention relates to a desalination device including such a flow-through capacitor and a desalination method using the desalination device. Background technique [0002] Flow-through capacitors (flow-type electric double layer capacitors) are used to remove substances contained in gases and liquids (aqueous solutions and non-aqueous solutions) and to change the composition. Generally, a flow-through capacitor includes electrodes having an electrode layer having a high surface area and a flow path provided between the electrodes. For removal of substances and change of composition, electrostatic adsorption, electrochemical reaction, catalytic decomposition, etc. using this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48
CPCC02F1/46109C02F2001/46133C02F1/4691C02F1/48C02F2201/46H01G11/86C02F2001/46161Y02E60/13
Inventor 直原敦
Owner KURARAY CO LTD
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