Composite electrode for a lithium battery
First Claim
1. A composite positive electrode for utilization in a rechargeable lithium battery, having a metallic current collector and a transition metal oxide containing positive electrode in contact with the metallic current collector, comprising:
- i) a metallic current collector sheet, bearing at least one oxidizable metal,ii) a mixed oxide interface layer bonded to a major face of said metallic current collector sheet, said mixed oxide interface layer comprising an oxide of said oxidizable metal in said metallic current collector sheet and a first oxide of a transition metal, said transition metal being selected from the group consisting of manganese, cobalt, nickel, vanadium, tungsten and alloys thereof,iii) a layer of said first oxide of said transition metal overlain and bonded to said mixed oxide interface layer, andiv) a positive electrode layer comprising a second oxide of said transition metal, said second oxide of said transition metal oxide being capable of incorporating lithium ions in its structure;
wherein said mixed oxide interface layer and said layer of said first oxide of said transition metal form a chemical and physical continuum between said metallic current collector sheet and said positive electrode layer.
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Accused Products
Abstract
The composite positive electrode comprises a metallic current collector sheet the surface of which bears a double layer of a mixed oxide interface containing an oxide of the metal of the current collector and a transition metal oxide, and a layer of the same transition metal oxide over the mixed oxide interface. The double layer is in contact with a positive electrode containing an oxide of the same transition metal as the cathode active ingredient. The composite positive electrode is designed to be incorporated in a rechargeable lithium battery.
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Citations
20 Claims
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1. A composite positive electrode for utilization in a rechargeable lithium battery, having a metallic current collector and a transition metal oxide containing positive electrode in contact with the metallic current collector, comprising:
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i) a metallic current collector sheet, bearing at least one oxidizable metal, ii) a mixed oxide interface layer bonded to a major face of said metallic current collector sheet, said mixed oxide interface layer comprising an oxide of said oxidizable metal in said metallic current collector sheet and a first oxide of a transition metal, said transition metal being selected from the group consisting of manganese, cobalt, nickel, vanadium, tungsten and alloys thereof, iii) a layer of said first oxide of said transition metal overlain and bonded to said mixed oxide interface layer, and iv) a positive electrode layer comprising a second oxide of said transition metal, said second oxide of said transition metal oxide being capable of incorporating lithium ions in its structure;
wherein said mixed oxide interface layer and said layer of said first oxide of said transition metal form a chemical and physical continuum between said metallic current collector sheet and said positive electrode layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A rechargeable lithium battery having:
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a) a negative electrode, b) a lithium ion conducting electrolyte, and c) a composite positive electrode having a metallic current collector and a transition metal oxide containing positive electrode in contact with the metallic current collector, comprising; i) a metallic current collector sheet, bearing at least one oxidizable metal, ii) a mixed oxide interface layer bonded to a major face of said metallic current collector sheet, said mixed oxide interface layer comprising an oxide of said oxidizable metal in said metallic current collector sheet and a first oxide of a transition metal, said transition metal being selected from the group consisting of manganese, cobalt, nickel, vanadium, tungsten and alloys thereof, iii) a layer of said first oxide of said transition metal overlain and bonded to said mixed oxide interface layer, and iv) a positive electrode layer comprising a second oxide of said transition metal, said second oxide of said transition metal oxide being capable of incorporating lithium ions in its structure; wherein said mixed oxide interface layer and said layer of said first oxide of said transition metal form a chemical and physical continuum between said metallic current collector sheet and said positive electrode layer. - View Dependent Claims (17, 18, 19, 20)
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Specification