1.5-3 V Lithium Batteries With Overcharge Protection
AssigneeAlbemarle Germany GmbH
InventorsUlrich Wietelmann, Ute Emmel, Irina Wolf, Margret Wohlfahrt-Mehrens, Serife Kaymaksiz Tost, Florian Wilhelm, Mario Wachtler
Life of this patent
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Abstract
Rechargeable, non-aqueous lithium batteries which contain, as active anode material, either lithium metal or a lithium alloy, an active cathode material with a redox potential in the range of between 1.5 and 3.4 V vs Li/Li+ and lithium rhodanide (LiSCN) as electrolyte component. One or more related methods for providing overcharge protection are also described herein.
Claims19
-15. (canceled)
A method for providing overcharge protection, the method comprising:
- providing a rechargeable and non-aqueous lithium battery comprising an active anode material, an active cathode material having a redox potential in the range between about 1.5 and 3.4 V vs. Li/Li+, and an electrolyte comprising a redox shuttle compound;
- wherein the redox shuttle compound is present in an amount sufficient to oxidize reversibly at about 0.5 to 1.5 V above the redox potential of the active cathode material of the rechargeable and non-aqueous lithium battery.
A method for providing overcharge protection, the method comprising:
- providing a rechargeable and non-aqueous lithium battery comprising an active anode material selected from the group consisting of lithium metal and a lithium alloy, an active cathode material having a redox potential in the range between about 1.5 and 3.4 V vs. Li/Li+, and an electrolyte comprising a redox shuttle compound present in the electrolyte in a concentration in the range of from 0.01 to 10 wt. %;
- and
- charging the rechargeable and non-aqueous lithium battery so as to cause the redox shuttle compound to oxidize reversibly at about 0.5 to 1.5 V above the redox potential of an active cathode material of the rechargeable and non-aqueous lithium battery;
- wherein the redox shuttle compound is lithium rhodanide (LiSCN);
- and
- wherein the active cathode material is selected from the group consisting of CFx, MnO2, V2O5, V6O13, FeOF, FeF3, S, and FeF2.
A rechargeable and nonaqueous lithium battery comprising:
- an active anode material selected from the group consisting of lithium metal and a lithium alloy;
- an active cathode material having a redox potential in the range between 1.5 and 3.4 V vs. Li/Li+, the active cathode material selected from the group consisting of CFx, a transition metal oxide, a transition metal sulfide, a transition metal fluoride, a transition metal oxyfluoride, an organic redox-active compound, sulfur, and selenium;
- and
- an electrolyte consisting of a reversible redox shuttle compound that is present in the electrolyte in a concentration in the range of from 0.01 to 15 wt %, which is lithium rhodanide (LiSCN), at least one additional conductive salt, and at least one organic aprotic solvent, wherein the at least one additional conductive salt is selected from the group consisting of LiPF6, a lithium fluoroalkyl phosphate, LiBF4, LiOSO2CF3, a methide salt, LiClO4, a lithium chelatoborate, a lithium fluorochelatoborate, a lithium chelatophosphate, a lithium fluorochelatophosphate and a lithium halide.
Dependencies are inferred from the claim text.