New (a)symmetric methylene and 1,1-ethylene diesters of fluoroacetic, (fluoro)propionic, (fluoro)butyric and/or (fluoro)pentanoic acid and known esters with acetate group(s) are used as solvent in electrolyte, e.g. of lithium battery

摘要

New methylene-bridged diesters (IA) are (a) symmetric methylene and 1,1-ethylene esters of fluoroacetic, (fluoro)propionic, (fluoro)butyric and/or (fluoro)pentanoic acid. New methylene-bridged diesters (IA) are (a) symmetric methylene and 1,1-ethylene esters of fluoroacetic, (fluoro)propionic, (fluoro)butyric and/or (fluoro)pentanoic acid of formula (I): R1, R4 = independently 2-4 carbon (C) alkyl or 1-4 C fluoroalkyl; R2 = hydrogen (H); R3 = H or methyl Independent claims are also included for the following: (a) the use of a wider range of diesters (I) of formula (I) R1, R4 = independently 1-4 C alkyl or 1-4 C fluoroalkyl; R2 = H; R3 = H or methyl as solvent in electrolytes, especially of lithium batteries; (b) the preparation of diesters (I); (c) electrolytes containing diesters (I) and a conductive sa and (d) mixtures containing diesters (I) and other electrolyte solvent(s).