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
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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.
Claims15
A method for providing overcharge protection to a rechargeabe and non-aqueous lithium battery, the method comprising:
- providing the rechargeabe and non-aqueous lithium battery comprising an anode comprising active anode material, a cathode comprising an active cathode material having a redox potential in a range from about 1.5 and 3.4 V vs. Li/Li+, and an electrolyte comprising at east one additional conductive salt and a redox shuttle compound present in the electrolyte in a concentration in a range from 0.01 to 15 wt. %,
- wherein the redox shuttle is lithium rhodanide (LiSCN),
- 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;
- charging the rechargeabe and non-aqueous lithium battery at a charging voltage greater than the redox potential of the active cathode material,
- wherein the charging voltage is about 0.5 to 1.5 V above the redox potential of the active cathode material.
A method for providing overcharge protection to a rechargeabe and non-aqueous lithium battery, the method comprising:
- providing the rechargeabe and non-aqueous lithium battery comprising an anode comprising active anode material, a cathode comprising an active cathode material having a redox potential in a range from about 1.5 and 3.4 V vs. Li/Li+, and an electrolyte comprising at least one additional conductive salt and a redox shuttle compound present in the electrolyte in a concentration in a range from 0.01 to 15 wt. %,
- wherein the redox shuttle is lithium rhodanide (LiSCN), and
- the active cathode material is selected from the group consisting of CFx, MnO2, V2O5V6O13, FeOF, FeF3, S, and FeF2,
- wherein the at last 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;
- and
- charging the rechargeabe and non-aqueous lithium battery at a charging voltage greater than the redox potential of the active cathode material,
- wherein the charging voltage is about 0.5 to 1.5 V above the redox potential of the active cathode material;
- oxidizing the redox shuttle compound to form an oxidized redox shuttle compound;
- diffusing the oxidized redox shuttle compound to the anode;
- and
- discharging the oxidized redox shuttle compound to form the redox shuttle compound.
Dependencies are inferred from the claim text.