▎ 摘　　要

NOVELTY - Preparing (M1) safe liquefied gas electrolyte that will gas off at 100 kPa at a temperature of 293.15 K, comprises (a) forming first mixture from a first electrolyte component mixed with a second electrolyte component to achieve (1) lower the vapor pressure of the first mixture by at least 10% as compared to the vapor pressure of the first electrolyte component alone when measured at 293.15 K, and (2) vapor pressure of the first mixture above 100 kPa at a temperature of 293.15 K, and (b) forming safe liquefied gas electrolyte by mixing a third electrolyte component to the first mixture, where the first electrolyte component is e.g. dimethyl ether, fluoromethane, difluoromethane, trifluoromethane, fluoroethane, tetrafluoroethane and/or pentafluoroethane, the second component is e.g. methane, ethane, propane, n-butane, isobutane and/or cyclopropane, and the third component is e.g. lithiumbis(trifluoromethanesulfonyl)imide, lithium hexafluorophosphate and/or lithium perchlorate. USE - The method is useful for preparing safe liquefied gas electrolyte for constructing electrochemical energy storage device which is a battery or capacitor (all claimed). ADVANTAGE - The liquefied gas electrolyte uses hydrocarbon solvent, which improves electrolyte properties including lower vapor pressure, lower GWP, and higher chemical stability. DETAILED DESCRIPTION - Preparing (M1) safe liquefied gas electrolyte that will gas off at 100 kPa at a temperature of 293.15 K, comprises (a) forming first mixture from a first electrolyte component mixed with a second electrolyte component to achieve (1) lower the vapor pressure of the first mixture by at least 10% as compared to the vapor pressure of the first electrolyte component alone when measured at 293.15 K, and (2) vapor pressure of the first mixture above 100 kPa at a temperature of 293.15 K, and (b) forming safe liquefied gas electrolyte by mixing a third electrolyte component to the first mixture, where the first electrolyte component is dimethyl ether, methyl ethyl ether, fluoromethane, difluoromethane, trifluoromethane, fluoroethane, tetrafluoroethane, pentafluoroethane, 1,1-difluoroethane, 1,2-difluoroethane, 1,1,1-trifluoroethane, 1,1,2-trifluoroethane, 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, chloromethane, chloroethane, thionyl fluoride, thionyl chloride fluoride, phosphoryl fluoride, phosphoryl chloride fluoride, sulfuryl fluoride, sulfuryl chloride fluoride, 1-fluoropropane, 2-fluoropropane, 1,1-difluoropropane, 1,2- difluoropropane, 2,2-difluoropropane, 1,1,1-trifluoropropane, 1,1,2- trifluoropropane, 1,2,2-trifluoropropane, fluoroethylene, cis-1,2-difluoroethylene, 1,1-difluoroethylene, 1-fluoropropylene, 2-fluoropropylene, chlorine, chloromethane, bromine, iodine, ammonia, methylamine, dimethylamine, trimethylamine, molecular oxygen, molecular nitrogen, carbon monoxide, carbon dioxide, sulfur dioxide, methyl vinyl ether, difluoroethylene, nitrous oxide, nitrogen dioxide, nitrogen oxide, carbon disulfide, hydrogen fluoride and/or hydrogen or their isomers,the second component is methane, ethane, propane, n-butane, isobutane, cyclopropane, ethene, propene, butene, cyclobutane, cyclobutene, acetylene, pentane, hexane, heptane, octane, cyclopentane, cyclohexane, cycloheptane and/or cyclooctane or their isomers, the third component is lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium hexafluorophosphate (LiPF6), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium tetrachloroaluminate (LiAlCl4), lithium tetragaliumaluminate, lithium bis(oxalato)borate (LiBOB), lithium hexafluorostannate, lithium difluoro(oxalato)borate (LiDFOB), lithium bis(fluorosulfonyl)imide (LiFSI), lithium aluminum fluoride (LiAlF3), lithium nitrate (LiNO3), lithium chloroaluminate, lithium tetrafluoroborate (LiBF4), lithium tetrachloroaluminate, lithium difluorophosphate, lithium tetrafluoro(oxalato)phosphate, lithium difluorobis(oxalato)phosphate, lithium borate, lithium oxolate, lithium thiocyanate, lithium tetrachlorogallate, lithium chloride, lithium bromide, lithium iodide, lithium carbonate, lithium fluoride, lithium oxide, lithium hydroxide, lithium nitride, lithium super oxide, lithium azide, lithium deltate, dilithium squarate, lithium carbonate dihydrate, dilithium rhodizonate, lithium oxalate, dilithium ketomalonate, lithium di-ketosuccinate and/or any corresponding salts with the positive charged lithium cation substituted for sodium or magnesium, and further useful salts including those with positively charged cations including tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, triethylmethylammonium, spiro-(1,1')-bipyrrolidinium, 1,1-dimethylpyrrolidinium, 1,1-diethylpyrrolidinium, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium, N,N-diethyl-N-methyl-N-propylammonium, N,N-dimethyl-N-ethyl-N-(3-methoxypropyl)ammonium, N,N-dimethyl-N-ethyl-N-benzylammonium, N,N-dimethyl-N-ethyl-N-phenylethylammonium, N-ethyl-N,N-dimethyl-N-(2-methoxyethyl)ammonium, N-tributyl-N-methylammonium, N-trimethyl-N-hexylammonium, N-trimethyl-N-butylammonium, N-trimethyl-N-propylammonium, 1,3-dimethylimidazolium, 1-(4-sulfobutyl)-3-methylimidazolium, 1-allyl-3H-imidazolium, 1-butyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium, 1-hexyl-3-methylimidazolium, 1-octyl-3-methylimidazolium, 3-methyl-1-propylimidazolium, 3-methylimidazolium, trihexyl(tetradecyl)phosphonium, N-butyl-N-methylpiperidinium, N-propyl-N-methylpiperidinium, 1-butyl-1-methylpyrrolidinium, 1-methyl-1-(2-methoxyethyl)pyrrolidinium, 1-methyl-1-(3-methoxypropyl)pyrrolidinium, 1-methyl-1-octylpyrrolidinium, 1-methyl-1-pentylpyrrolidinium, and/or N-methylpyrrolidinium paired with negatively charged anions including acetate, bis(fluorosulfonyl)imide, bis(oxalate)borate, bis(trifluoromethanesulfonyl)imide, bromide, chloride, dicyanamide, diethyl phosphate, hexafluorophosphate, hydrogen sulfate, iodide, methanesulfonate, methyl-phophonate, tetrachloroaluminate, tetrafluoroborate and trifluoromethanesulfonate. INDEPENDENT CLAIMS are also included for: (1) constructing (M2) electrochemical energy storage device with the safe liquefied gas electrolyte that will gas off at 100 kPa at 293.15 K; and (2) energy storage device.