Cathode hybrid electrolyte for solid secondary battery, cathode including the cathode hybrid electrolyte, method of preparing the cathode, and solid secondary battery including the cathode hybrid electrolyte

A cathode hybrid electrolyte for a solid secondary battery, the cathode hybrid electrolyte comprising

• an ion conductor represented by Formula 1,
• an ionic liquid, and
• a lithium salt different from the ion conductor of Formula 1, wherein an amount of the ion conductor is in a range of about 0.1 parts by weight to about 50 parts by weight based on 100 parts by weight of the lithium salt
• wherein, in Formula 1, X is an unsubstituted or substituted C6-C30 arylene group, an unsubstituted or substituted C2-C30 heteroarylene group, or —C(═O)O—R7—;
• R7 is an unsubstituted or substituted C1-C30 alkylene group or an unsubstituted or substituted C6-C30 arylene group;
• R1 to R3 are each independently hydrogen, an unsubstituted or substituted C1-C20 alkyl group, an unsubstituted or substituted C6-C20 aryl group, or an unsubstituted or substituted C2-C30 heteroaryl group;
• —Y− is an anionic moiety, wherein an anion of the ionic liquid comprises the same anionic moiety —Y− as in Formula 1;
• n is a degree of polymerization, which is a number in a range of 10 to 500, and wherein the ion conductor represented by Formula 1 is a homopolymer.