ADDITIVE FOR NONAQUEOUS ELECTROLYTE OF ELECTRIC DOUBLE-LAYER CAPACITOR, NONAQUEOUS ELECTROLYTE FOR ELECTRIC DOUBLE-LAYER CAPACITOR, AND NONAQUEOUS ELECTROLYTE ELECTRIC DOUBLE-LAYER CAPACITOR

摘要

PPROBLEM TO BE SOLVED: To provide an additive for nonaqueous electrolyte of electric double-layer capacitor having a sufficiently high boiling point, in which vaporizations do not take place during use under high temperature, safety of electrolyte can be ensured sufficiently, even at the time of emergency, e.g. short circuiting, and superior low-temperature characteristics can be imparted. PSOLUTION: The additive for nonaqueous electrolyte of electric double-layer capacitor is composed of a phosphagen compound containing at least two kinds of halogen element represented for formula (I): (NPXSB2/SB)SBn/SB(where, X is an independent halogen element, and n is an integer of 3-15). PCOPYRIGHT: (C)2006,JPO&NCIPI