Method of making non-aqueous electrochemical cell
First Claim
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.
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Abstract
A lithium electrochemical cell includes an electrolyte having a mixture of solvents including propylene carbonate (PC) and dimethoxyethane (DME), and a salt mixture. The salt mixture includes lithium trifluoromethanesulfonate (LiTFS), and lithium trifluoromethanesulfonimide (LiTFSI), and the cell contains less than 1500 ppm by weight of sodium. The mixture of solvents can further include ethylene carbonate (EC).
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Citations
18 Claims
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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.
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9. 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 ethylene carbonate, 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.
Specification