Electrode composition for capacitive deionization device, and electrode for capacitive deionization device containing the same

Patent metadata

Field	Value
Publication number	US-10376874-B2
Application number	US-201515114280-A
Country	US
Kind code	B2
Filing date	Jan 29, 2015
Priority date	Jan 29, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

Provided are a binder composition for an electrode for a capacitive deionization device including a first polymer including a first structural unit including a zwitterionic functional group and a second structural unit including a cross-linkable functional group, a cross-linking agent, and ionic functional group, an electrode for a capacitive deionization device including the composition, a capacitive deionization device including the electrode, and a method of removing ions from a fluid using the device.

First claim

What is claimed is:

1. An electrode binder composition for a capacitive deionization device, comprising:
a first hydrophilic polymer, a cross-linking agent, and an ion exchange group, the first hydrophilic polymer comprising a first structural unit, a second structural unit, and a third structural unit, the first structural unit represented by Chemical Formula 1 and including a zwitterionic functional group, the second structural unit represented by Chemical Formula 2 and including a cross-linkable functional group, the third structural unit represented by Chemical Formula 3 and including a hydrophobic functional group,

wherein in Chemical Formula 1,
R 1 , R 2 , and R 3 are independently selected from hydrogen, a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C3 to C30 cycloalkyl group, a C6 to C30 aryl group, or a combination thereof,
R 4 is selected from hydrogen, a C1 to C10 alkyl group, a C3 to C10 cycloalkyl group, a C6 to C20 aryl group, or a combination thereof,
L 1 is a single bond, a C1 to C20 alkylene group, a C2 to C20 alkenylene group, a C2 to C20 alkynylene group, a C3 to C30 cycloalkylene group, a C6 to C30 arylene group, or a combination thereof, and
A is an anionic functional group,

wherein in Chemical Formula 2,
R 5 , R 6 , and R 7 are independently selected from hydrogen, a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C3 to C30 cycloalkyl group, a C6 to C30 aryl group, or a combination thereof,
L 2 is selected from a single bond, a C1 to C20 alkylene group, a C2 to C20 alkenylene group, a C2 to C20 alkynylene group, a C3 to C30 cycloalkylene group, a C6 to C30 arylene group, or a combination thereof, and
R 8 is a hydroxy group, a carboxyl group, a cyano group, or an acrylate group,

wherein in Chemical Formula 3,
R 9 , R 10 , and R 11 are independently selected from hydrogen, a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C3 to C30 cycloalkyl group, a C6 to C30 aryl group, or a combination thereof,
L 3 is selected from a single bond, or a C1 to C20 alkylene group, a C2 to C20 alkenylene group, a C2 to C20 alkynylene group, a C3 to C30 cycloalkylene group, a C6 to C30 arylene group, —(C═O)O—, —O(C═O)—, —(C═O)—, —O—, or a combination thereof, and
R 12 is selected from a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C3 to C30 cycloalkyl group, a C6 to C30 aryl group, a cyano group, or a combination thereof.

2. The electrode binder composition for a capacitive deionization device of claim 1 , wherein A of Chemical Formula 1 is a hydroxy group, a carboxyl group, a sulfonic acid group, a phosphonic acid group, an acrylate group, a methacrylate group, or a halogenated salt.

3. The electrode binder composition for a capacitive deionization device of claim 1 , wherein R 1 to R 4 of Chemical Formula 1 are all hydrogen, L 1 is a C1 to C10 alkylene group, and A is a sulfonic acid group.

4. The electrode binder composition for a capacitive deionization device of claim 1 , wherein R 5 of Chemical Formula 2 is methyl, R 6 and R 7 are hydrogen, L 2 is a C1 to C10 alkylene group, and RB is a hydroxy group.

5. The electrode binder composition for a capacitive deionization device of claim 1 , wherein R 9 of Chemical Formula 3 is hydrogen or methyl, R 10 and R 11 are hydrogen, L 3 is a single bond or —(C═O)O—, and R 12 is a methyl, phenyl, or cyano group.

6. The electrode binder composition for a capacitive deionization device of claim 1 , wherein the third structural unit represented by Chemical Formula 3 is derived from monomers represented by Chemical Formula 4 to Chemical Formula 6:

7. The electrode binder composition for a capacitive deionization device of claim 1 , further comprising:
at least one second hydrophilic polymer selected from polystyrene, polyacrylic acid-co-maleic acid, polyvinyl alcohol, carboxylmethyl cellulose, hydroxypropyl cellulose, polyvinylchloride, carboxylated polyvinylchloride, polyvinylfluoride, polyvinyl amine, chitosan, polyamide, polyurethane, polyacrylamide, polyacrylamide-co-acrylic acid, a polystyreneacrylic acid copolymer, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyvinylpyrrolidone, an epoxy resin, and a combination thereof.

8. The electrode binder composition for a capacitive deionization device of claim 7 , wherein the second hydrophilic polymer is included in an amount of less than or equal to about 50 wt % relative to a weight of the first hydrophilic polymer.

9. The electrode binder composition for a capacitive deionization device of claim 1 , wherein the first structural unit including a zwitterionic functional group represented by Chemical Formula 1 is included in an amount of about 30 mol % to about 95 mol % and the second structural unit including a cross-linkable functional group represented by Chemical Formula 2 is included in an amount of about 0.5 mol % to about 5 mol % in the first hydrophilic polymer.

10. The electrode binder composition for a capacitive deionization device of claim 1 , wherein the third structural unit represented by Chemical Formula 3 is included in an amount of less than about 50 mol % in the first hydrophilic polymer.

11. The electrode binder composition for a capacitive deionization device of claim 1 , wherein the cross-linking agent is one or more selected from ethylene glycol, glycerol, 1,6-hexanediol, 1.4-butanediol, glutaric acid, glutaricaldehyde, succinic acid, succinic anhydride, adipic acid, phthalic acid, ethylene glycol diglycidyl ether, sulfosuccineic acid, sulfosalicylic acid, succinamic acid, ethylenediamine, and a combination thereof.

12. The electrode binder composition for a capacitive deionization device of claim 1 , wherein the ion exchange group is one or more selected from sulfoacetic acid, sulfophthalic acid, hydroquinonesulfonic acid, sulfobenzoic acid, tetrabutylammonium hydroxide, tetrabutylammonium acetate, tetraethylammonium hydroxide, tetraethylammonium acetate, and a combination thereof.

13. The electrode binder composition for a capacitive deionization device of claim 1 , wherein based on 100 parts by weight of the first hydrophilic polymer, the cross-linking agent is included in an amount of about 0.5 to 10 parts by weight, and the ion exchange group is included in an amount of about 5 to 50 parts by weight.

14. An electrode composition for a capacitive deionization device comprising:
the electrode binder composition of claim 1 ; and
an electrode active material.

15. The electrode composition of claim 14 , wherein the electrode active material is an activated carbon series material of an activated carbon powder, an activated carbon fiber, carbon nanotube, carbon aerogel, mesoporous carbon, graphite oxide, or a mixture thereof, or a metal oxide series material of RuO 2 , Ni(OH) 2 , MnO 2 , PbO 2 , TiO 2 , or a mixture thereof.

16. The electrode composition of claim 14 , wherein the electrode active material is included in an amount of about 10 to about 400 parts by weight based on 100 parts

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Yeong Suk
• Lim Ju Wan

Classifications

• C08J3/246

  Intercrosslinking of at least two polymers · CPC title

• C08J2429/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C02F1/469

  by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis · CPC title

• C02F1/4691

  Capacitive deionisation · CPC title

• C02F2001/46138

  Electrodes comprising a substrate and a coating · CPC title