Patent ID: 7566350
Filing Date: 2009-07-28
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A method of manufacturing a lithium electrochemical cell containing less than 1500 ppm by weight of sodium, the method comprising (a) cleaning a case with a solution that does not contain sodium, (b) providing a cathode, an anode, a separator, and an electrolyte comprising propylene carbonate, dimethoxyethane, lithium trifluoromethanesulfonate, and lithium trifluoromethanesulfonimide, these components having sufficiently low quantities of sodium that, when combined with the case, can provide a lithium electrochemical cell containing less than 1500 ppm by weight of sodium, and (c) assembling the cathode, the anode, the separator, and the electrolyte from step (b) into the case from step (a) to provide a lithium electrochemical cell containing less than 1500 ppm by weight of sodium.