Electrolyte, electrochemical device, lithium ion secondary battery, and module

An electrolyte solution, comprising:

• a lithium salt;
• and
• at least one selected from the group consisting of a compound represented by the following formula (1-1) and a compound represented by the following formula (1-2),
• the formula (1-1) being:
• wherein R101 is an optionally fluorinated C1-C7 alkyl group, an optionally fluorinated C2-C8 alkenyl group, an optionally fluorinated C2-C9 alkynyl group, or an optionally fluorinated C6-C12 aryl group, and optionally contains at least one selected from the group consisting of O, Si, S, and N in a structure,
• the formula (1-2) being:
• wherein R102 and R103 are (i) each individually H, F, an optionally fluorinated C1-C7 alkyl group, an optionally fluorinated C2-C7 alkenyl group, an optionally fluorinated C2-C9 alkynyl group, or an optionally fluorinated C5-C12 aryl group, or (ii) hydrocarbon groups binding to each other to form a 5-membered or 6-membered hetero ring with a nitrogen atom;
• and R102 and R103 each optionally contain at least one selected from the group consisting of O, S, and N in a structure.