Nonaqueous electrolyte and nonaqueous electrolyte secondary battery using the same

摘要

A nonaqueous electrolyte containing a silicon compound of formula (1) or (2) and a nonaqueous electrolyte secondary battery using the nonaqueous electrolyte and excellent in cycle characteristics and low temperature characteristics, wherein R₁ and R₂ each represent alkyl, cycloalkyl, alkoxy or halogen; R₃ represents alkenyl; and X represents halogen, wherein R₄, R₅, R₆, and R₇ each represent alkyl, alkoxy, alkenyl, alkenyloxy, alkynyl, alkynyloxy, phenyl or phenoxy, each of which may have an ether bond in its chain; R₈ represents halogen, halogen-substituted aryl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl; a trifluoromethyl group, an acyloxy group having 5 to 8 carbon atoms, a sulfonate group having 1 to 8 carbon atoms, an isocyanyl group an isothianyl or a cyano group, R₉ represents halogen, a trifluoromethyl group,an acyloxy group having 5 to 8 carbon atoms, a sulfonate group having 1 to 8 carbon atoms, an isocyanyl group an isothianyl or a cyano group: halogen-substituted aryl; n represents 1 or 2; and Y represents a single bond, oxygen, alkylene, alkylenedioxy, alkenylene, alkenylenedioxy, alkynylene, alkynylenedioxy, arylene or arylenedioxy; provided that the number of groups having an unsaturated bond in R₄, R₅, R₆, R₇, R₈, and R₉ is zero or one.