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

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,
• R1, R2, and R3 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,
• R4 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,
• L1 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,
• R5, R6, and R7 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,
• L2 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
• R8 is a hydroxy group, a carboxyl group, a cyano group, or an acrylate group,
• wherein in Chemical Formula 3,
• R9, R10, and R11 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,
• L3 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
• R12 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.