LiPO3-based coating for collectors
AssigneeHydro-Quebec
InventorsMichel Gauthier, Simon Besner, Michel Armand, Jean-François Magnan, Hugues Hamelin, André Bélanger
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Abstract
The present invention is concerned with a protective coating with current applied on a metallic collector of an electrode. The protective coating comprises a mineral binder vitreous or partly vitreous and optionally an electronic conduction additive. This coating is applied in the form of a solution or dispersion on the collector of the electrode and dried, so that it coats and protects at least part of the surface of the metal of the collector to prevent the formation of passivation films generated by active species produced by other components of the generator.
Claims22
An electrochemical generator comprising a separating electrolyte between two electrodes, wherein at least one of the electrodes comprises a metallic current collector coated at least partially with a conductive coating, chemically compatible with an adjacent electrode material, the coating comprising a mineral binder being vitreous or partly vitreous and comprising an alkaline metal phosphate, an alkaline metal polyphosphate, or mixtures thereof, wherein at least one electronic conduction additive is dispersed, the coating being contacted with the collector to protect a thus coated metallic surface from the formation of passivation films.
A process for coating at least partly a surface of a metallic collector of an electrode with a passivation protector, the process comprising:
- a) preparing an aqueous dispersion solution of a mineral binder being vitreous or partly vitreous and comprising an alkaline metal phosphate, an alkaline metal polyphosphate, or mixtures thereof, wherein at least one electronic conduction additive is dispersed;
- b) coating the surface of the metallic collector with the dispersion prepared in step a), followed by drying thereof to produce a partly or completely coated surface to prevent formation of passivation films.
An electrode comprising a metallic current collector coated at least partly with a conductive coating, chemically compatible with an adjacent electrode material, the coating comprising a mineral binder being vitreous or partly vitreous and comprising an alkaline metal phosphate, an alkaline metal polyphosphate, and mixtures thereof, wherein is dispersed an electronic conduction additive ensuring electronic exchanges between the electrode and the collector, the coating being contacted with the collector to protect the metallic surface coated from the formation of passivation films.
Dependencies are inferred from the claim text.