Patent ID: 7306705
Filing Date: 2007-12-11
Classification: C07F,H01M,Y02E

Abstract:
1. A method for dehydrating an aqueous composition consisting of water, lithium bis(pentafluoroethanesulfonyl)imide and at least one organic solvent selected from the group consisting of propylene carbonate, ethylene carbonate, butylene carbonate, γ-butyrolactone, γ-valerolactone, sulfolane, 3-methyl sulfolane, dimethylsulfoxide, N,N-dimethylformamide, N-methyloxazolidinone, N-methylpyrrolidone, 1,3 -dimethyl-2-imidazolone, diethyl carbonate, ethyl methyl carbonate, and 1,2-dimethoxyethane, wherein a water content to the lithium bis(pentafluoroethanesulfonyl)imide in the composition before dehydration of the solvent is 100 ppm to 13250 ppm and a part of the at least one organic solvent is distilled off together with water.