Patent ID: 7311993
Filing Date: 2007-12-25
Classification: C01B,H01M,Y02E

Abstract:
1. A lithium secondary battery comprising at least one salt and at least one solvent wherein the salt comprises: a lithium dodecafluorborate salt of the formula: wherein x is greater than or equal to 8 and less than or equal to 12 and Z represents H, Cl, and Br, and wherein the solvent comprises at least one member selected from the group consisting of chloroethylene carbonate, butylene carbonate, dimethyl carbonate, dimethylvinylene carbonate, ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dipropyl carbonate, bis(trifluoroethyl) carbonate, bis(pentafluoropropyl) carbonate, trifluoroethyl methyl carbonate, pentafluoroethyl methyl carbonate, heptafluoropropyl methyl carbonate, perfluorobutyl methyl carbonate, trifluoroethyl ethyl carbonate, pentafluoroethyl ethyl carbonate, propylene carbonate, heptafluoropropyl ethyl carbonate, perfluorobutyl ethyl carbonate, vinylene carbonate, fluorinated oligomers, dimethoxyethane, diglyme, triglyme, dimethylvinylene carbonate, trifluoropropylene carbonate tetraethyleneglycol, dimethyl ether, polyethylene glycols, sulfones, polyethers, polyethylene oxides, polyimides, polyphosphazines, polyacrylonitriles, polysiloxanes, sulfonated polyimides, perfluorinated membranes, divinyl polyethylene glycols, polyethylene glycol-bis-(methyl acrylates), polyethylene glycol-bis(methyl methacrylates), polyether grafted polysiloxanes, aprotic gel polymers, and gamma-butyrolactone.