Carbon dioxide absorbent containing ionic material containing cyclic ammonium cation and hydroxide anion, and carbon dioxide separation method using the same

A carbon dioxide absorbent comprising an ionic material containing a cyclic ammonium cation represented by the following Chemical Formula 1 and a hydroxide anion:

• wherein
• R1 to R4 are each independently —H, a C1-20 alkyl group, a C1-20 alkoxy group, a C1-10 alkoxy C1-10 alkyl group, a C5-20 cycloalkyl group, or a 5-membered to 20-membered heterocycloalkyl group;
• R5 and R6 are each independently —H, a C1-20 alkyl group, a C1-10 alkoxy C1-10 alkyl group, a C5-20 cycloalkyl group, or a 5-membered to 20-membered heterocycloalkyl group;
• L1 is a single bond, —O—, —NR7—, or a C1-8 alkylene group;
• R7 is —H or a C1-10 alkyl group, or R7 may be bonded to R5 to form a ring;
• and
• the C1-20 alkyl group, the C1-20 alkoxy group, the C1-10 alkoxy C1-10 alkyl group, the C5-20 cycloalkyl group, and the 5-membered to 20-membered heterocycloalkyl group of R1 to R7 may each independently be substituted with a halogen group, —OH, —NH2, or —NO2.