Bifunctional metal-air electrode
First Claim
1. A bifunctional air electrode for use in a secondary metal-air electrochemical cell comprising:
- an active layer having an electrolyte side and an air side and comprising an oxygen reduction catalyst having a first oxygen evolution potential and an oxygen evolution catalyst having a second oxygen evolution potential less than the first oxygen evolution potential, the oxygen evolution catalyst being present in a greater concentration proximate the air side than proximate the electrolyte side;
a current collector in electrical contact with the active layer; and
a wet-proofing layer laminated to the air side of the active layer.
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Accused Products
Abstract
A bifunctional air-electrode for use in electrochemical energy cells discharges a satisfactory current on the first discharge cycle and operates for a relatively large number of charge-discharge cycles without gas forming between the electrolyte side of the air electrode and the electrolyte. The active layer of the electrode includes an oxygen reduction catalyst having a first oxygen evolution potential and an oxygen evolution catalyst having a second oxygen evolution potential less than the first oxygen evolution potential, the oxygen reduction catalyst being present in a greater concentration proximate the electrolyte side than proximate the air side and the oxygen evolution catalyst being present in a greater concentration proximate the air side than proximate the electrolyte side.
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Citations
23 Claims
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1. A bifunctional air electrode for use in a secondary metal-air electrochemical cell comprising:
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an active layer having an electrolyte side and an air side and comprising an oxygen reduction catalyst having a first oxygen evolution potential and an oxygen evolution catalyst having a second oxygen evolution potential less than the first oxygen evolution potential, the oxygen evolution catalyst being present in a greater concentration proximate the air side than proximate the electrolyte side; a current collector in electrical contact with the active layer; and a wet-proofing layer laminated to the air side of the active layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification