Flame-retardant or non-flammable polymer gel electrolyte, lithium battery including the same, supramolecular polymer, and method of preparing the supramolecular polymer

A supramolecular polymer comprising

• at least one selected from a repeating unit represented by Formula 1 below, a compound represented by Formula 2 below, a repeating unit derived from the compound represented Formula 2, and a reaction product derived from the compound represented by Formula 2:
• wherein, in Formulae 1 and 2,
• M1, M2, M3 and M4 are each independently an arylene group selected from arylene groups represented by Formulae 3a to 3d below or a cycloalkylene group selected from cycloalkylene groups represented by Formulae 3e to 3g below,
• U1, U2, U3, U4, U5, U6 and U7 are each independently —NH—C(═O)O—, —OC(═O)—NH—, —C(═O)—NH—, —NH—C(═O)—, —NH—C(═O)—NH—, —NH—, or —O—,
• V1 and V2 are each independently an isocyanate group,
• L1, L2, L3, L4 and L5 are each independently a C2-C5 alkylene group,
• A1, A2 and A3 are each independently a C2-C5 alkylene oxide repeating unit,
• a, b, c, d, e, f and g are each independently 0 or 1,
• wherein, in Formulae 3a to 3g,
• R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19 and R20 are each independently hydrogen, a halogen, a hydroxyl group, or a C11-C10 alkyl group unsubstituted or substituted with a halogen,
• X1 is —CH2—, —CH2CH2—, —CH2CH2CH2—, —CH2CH2CH2CH2—, —O—, —C(═O)—, —S—, or —C(═S)—, and
• p is a polymerization degree of 2 to 1000.

A method of preparing a supramolecular polymer, the method comprising:

• reacting a first precursor compound including a soft segment, a first solution including a first solvent, and a second precursor compound including a hard segment to prepare a prepolymer;
• and
• reacting a third precursor compound including a spacer, a second solution including a second solvent, and the prepolymer to prepare a supramolecular polymer,
• wherein the first solvent and the second solvent have a first volume ratio in which 70 parts by volume or less of the second solvent is included with respect to 100 parts by volume of the first solvent, or a second volume ratio in which 80 parts by volume or more of the second solvent is included with respect to 100 parts by volume of the first solvent, and
• viscosity of a first supramolecular polymer prepared by the first volume ratio is 50% or less of viscosity of a second supramolecular polymer prepared by the second volume ratio.