ELECTROLYTE SYSTEM FOR LITHIUM BATTERIES, THE USE THEREOF AND METHOD FOR ENHANCING SAFETY OF LITHIUM BATTERIES

摘要

The invention relates to electrolyte systems for lithium batteries with enhanced safety. Said systems have at least one conductive salt containing lithium and at least one electrolyte liquid. According to the invention, said electrolyte systems are characterized by an active content of at least one partially fluorinated amide of general formula (I): R<1>CO-NR<2>R<3>, wherein R<1> is a linear C1-C6 alkyl group, in which one or more hydrogen atoms are substituted by fluorine atoms, or a branched C3-C6 alkyl group in which one or more hydrogen atoms are substituted by fluorine atoms, or a C3-C7 cycloalkyl group optionally substituted once or several times by a linear C1-C6 alkyl group and/or branched C3-C6 alkyl group, in which one or more hydrogen atoms of the cycloalkyl radical and/or the optionally substituting linear and/or branched alkyl radical is substituted by fluorine atoms; R<2> and R<3> independently represent an identical or different linear C1-C6 alkyl group, a branched C3-C6 alkyl group or a C3-C7 cycloalkyl group, or R<2> and R<3> form together with the amide nitrogen a saturated five or six-membered ring containing nitrogen or are bonded to a four to seven-membered ring with one or more additional N and/or O atom(s), wherein the additional N atoms present in the ring are optionally saturated with C1-C3 alkyl and the ring carbons may also carry C1-C3 alkyl.