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US 7,744,659 B2Granted
Method of making non-aqueous electrochemical cell
AssigneeThe Gillette Company
InventorsWilliam L. Bowden, Nikolai N. Issaev, Michael Pozin
Life of this patent
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Abstract
A method of making a lithium electrochemical cell includes treating the cathode active material with an agent that includes lithium but not sodium. A cathode including the cathode active material, an anode, a separator, and an electrolyte are assembled in a housing to provide a cell containing less than 1500 ppm by weight of sodium.
Claims10
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 a first ether and lithium iodide, wherein the first ether is dimethyoxyethane, and wherein the electrolyte in addition to the first ether also includes dioxolane, 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.
Dependencies are inferred from the claim text.