TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: (I) are phenyl silylmethyl sulfone, phenyl silylethyl sulfone, phenyl (trimethylsilyl)methyl sulfone, phenyl 2-(trimethylsilyl)ethyl sulfone, phenyl (trimethoxysilyl)methyl sulfone and/or phenyl 2-(trimethoxysilyl)ethyl sulfone. The content of (I) in the non-aqueous liquid electrolyte is 0.1-10 pts. wt.. The ionizable lithium salt includes fluoride, chloride, bromide, iodide, nitrate, dicyanamide, tetrafluoroborate, perchlorate, hexafluorophosphate, di(trifluoromethyl)tetrafluorophosphate, tri(trifluoromethyl)trifluorophosphate, tetra(trifluoromethyl)difluorophosphate, penta(trifluoromethyl)monofluorophosphate, hexa (trifluoromethyl)phosphate, trifluoromethane sulfonate, perfluoroethyl sulfonate, bis(trifluoromethylsulfonyl)imide, bis(fluorosulfonyl)imide, 1,1,1,3,3,4,4,4-octafluoro-2-(trifluoromethyl)butan-2-olate, bis(trifluoromethylsulfonyl)methanide, tris(pentafluoro- lambda (6)-sulfanyl)methanide, tris(trifluoromethane sulfonyl)methanide, perfluoro-n-octyl-sulfonate, perfluoroacetate, acetate or bis(pentafluoroethylsulfonyl)imide as anion. The organic solvent is ether, ester, amide, linear carbonate and/or cyclic carbonate. The cyclic carbonate is at least one of ethylene carbonate, polypropylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate and vinylene carbonate or their halides. The linear carbonate is dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethyl methyl carbonate, methyl propyl carbonate and/or ethyl propyl carbonate. The ether is dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether and/or ethyl propyl ether. The ester is methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, gamma -butyrolactone, gamma -valerolactone, gamma -caprolactone, sigma -valerolactone and/or epsilon -caprolactone. Preferred Composition: The non-aqueous liquid electrolyte further comprises vinylene carbonate, fluoro-ethylene carbonate, vinyl ethylene carbonate, cyclic sulfite, saturated sultone, unsaturated sultone and/or non-cyclic sulfone. EXAMPLE - Ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate in a volume ratio of 3:3:4 and 1M lithium hexafluorophosphate were used to prepare electrolytic solution and then 1 pts. wt. vinylene carbonate and 0.5 pts. wt. phenyl 2-(trimethylsilyl)ethyl sulfone were added to the obtained electrolyte solution to obtain the non-aqueous liquid electrolyte.