ELECTROLYTIC SOLUTION USING IMIDAZOLIUM SALT ELECTROLYTE, AND ELECTROCHEMICAL ELEMENT

摘要

PPROBLEM TO BE SOLVED: To provide an electrolytic solution excelling in performance in a low-temperature environment, and having a high capacity-retentive rate and a low internal resistance increase rate, and to provide an electrochemical element stably usable even at low temperature and excelling in long-term stability. PSOLUTION: This electrolytic solution for an electrochemical element containing an electrolyte (B) containing an imidazolium salt (A) represented by a specific formula, and a chain sulfone (C) represented by a specific formula is used. The imidazolium salt (A) contains halogen atoms, a univalent hydrocarbon group having at least one of group selected from a hydroxyl group, a nitro group, a cyano group and a group having an ether bond, or hydrogen. The chain sulfone (C) contains 1-8C organic group. PCOPYRIGHT: (C)2011,JPO&INPIT