Patent ID: 6159640
Filing Date: 2000-12-12
Classification: H01M,Y02E

Abstract:
An electrolyte system for lithium batteries of increased safety and comprising at least one lithium-containing conducting salt and at least one electrolyte fluid, comprising at least one partially fluorinated carbamate of the formula (I) ##STR3## where R.sup.1 and R.sup.2 independently of one another are identical or different, linear C.sub.1 -C.sub.6 alkyl, branched C.sub.3 -C.sub.6 -alkyl, or C.sub.3 -C.sub.7 -cycloalkyl, wherein one or more of the hydrogen atoms in said alkyl or cycloalkyl groups are optionally replaced by fluorine atoms;orR.sup.1 and R.sup.2 are linked directly to form an optionally substituted C.sub.3 -C.sub.7 membered ring wherein the optional substituents are C.sub.1 -C.sub.3 -alkyl group and one or more hydrogen atoms in said ring or said C.sub.1 -C.sub.3 -alkyl group are optionally replaced by fluorine atoms, and wherein one or more of the ring members are replaced by a nitrogen or oxygen atom where the nitrogen atom is optionally substituted by a C.sub.1 -C.sub.3 -alkyl group, in which the hydrogen atoms, in turn, are optionally replaced by fluorine atoms;R.sup.3 is a partially fluorinated or perfluorinated straight-chain alkyl group having from 1 to 6 carbon atoms, is a partially fluorinated or perfluorinated branched alkyl group having from 3 to 6 carbon atoms or a partially fluorinated cycloalkyl group having from 3 to 7 carbon atoms, is optionally monosubstituted or polysubstituted with C.sub.1 -C.sub.6 -alkyl.