Cobalt-based alloys as positive electrode current collectors in nonaqueous electrochemical cells
AssigneeWilson Greatbatch Ltd.
InventorsChristine A. Frysz, Sally Ann Smesko, Peter A. Kreidler, W. Richard Brown, Esther S. Takeuchi
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Abstract
Cobalt-based alloys are provided for use as a positive electrode current collector in a solid cathode, nonaqueous liquid electrolyte, alkali metal anode active electrochemical cell. The cobalt-based alloys are characterized by chemical compatibility with aggressive cell environments, high corrosion resistance and resistance to fluorination and passivation at elevated temperatures, thus improving the longevity and performance of the electrochemical cell. The cell can be of either a primary or a secondary configuration.
Claims41
An electrochemical cell, which comprises:
- a) an anode comprising lithium;
- b) a counter electrode comprising fluorinated carbon supported on a current collector, wherein, by weight percent, the current collector comprises:
- (i) cobalt in a concentration of at least about 18.5%, wherein cobalt and nickel are present in an amount greater than or equal to about 35%;
- (ii) about 19% to 27.5% chromium;
- (iii) at least one of molybdenum and tungsten in an amount such that the sum of chromium, molybdenum and tungsten is at least about 25%;
- (iv) 0 to about 0.2% nitrogen;
- and
- (v) 0 to about 32% iron;
- and
- c) an electrolyte activating the anode and the counter electrode.
A method for providing any electrochemical cell, comprising the steps of:
- a) providing an anode comprising lithium;
- b) providing a counter electrode comprising fluorinated carbon supported on a current collector, wherein, by weight percent, the current collector comprises:
- (i) cobalt in a concentration of at least about 18.5%, wherein cobalt and nickel are present in an amount greater than or equal to about 35%;
- (ii) about 19% to 27.5% chromium;
- (iii) at least one of molybdenum and tungsten in an amount such that the sum of chromium, molybdenum and tungsten is at least about 25%;
- (iv) 0 to about 0.2% nitrogen;
- and
- (v) 0 to about 32% iron;
- and
- c) activating the anode and the counter electrode with electrolyte.
Dependencies are inferred from the claim text.