METHOD FOR IMPROVING ENVIRONMENTAL STABILITY OF CATHODE MATERIALS FOR LITHIUM BATTERIES
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Abstract
A method for improving the environmental stability of cathode materials used in lithium-based batteries. Most currently used cathode active materials are acutely sensitive to environmental conditions, e.g. leading to moisture and CO2 pickup, that cause problems for material handling especially during electrode preparation and to gassing during charge and discharge cycles. Binder materials used for making cathodes, such as PVDF and PTFE, are mixed with and/or coated on the cathode materials to improve the environmental sensitivity of the cathode materials.
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Citations
28 Claims
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1-23. -23. (canceled)
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24. A method for improving the environmental stability of cathode material for lithium-based battery cathodes, the method comprising:
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a) providing a lithium-based compound comprising LiNiO2; b) introducing a binder including PVDF to the lithium-based compound and mixing them wherein the binder ranges up to about 10% of the cathode and is used in the downstream preparation of the cathode disposed in the battery; c) heating the lithium-based compound and the binder to about 180°
C. for about an hour;d) adding a Lewis acid to the lithium-based compound and the binder, the Lewis acid having a molecular weight of less than about 200 grams per molar compound; and e) causing the binder to coat the lithium-based compound. - View Dependent Claims (25, 26, 27, 28)
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Specification