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US 2006/0068288 A1Published application
Alkaline electrochemical cell
AssigneeEveready Battery Company, Inc.
InventorRobert Johnson
Life of this patent
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Abstract
An alkaline electrochemical cell capable of providing optimum discharge efficiencies at both a high tech drain rate and a low drain rate is disclosed. In one embodiment, the ratio of the anode's electrochemical capacity to the cathode's electrochemical capacity is between 1.33:1 and 1.40:1 and the surface area of the anode to cathode interface is maximized.
Claims31
An electrochemical cell, comprising:
- a container housing a first electrode, a second electrode, an alkaline electrolyte, and a separator;
- said first electrode defines a cavity therein and comprises manganese dioxide as an electrochemically active material, said first electrode's electrochemical capacity determined by multiplying the grams of manganese dioxide by 285 mAhr/g;
- said second electrode, disposed within said cavity, comprises zinc as an electrochemically active material, said second electrode's electrochemical capacity determined by multiplying the grams of zinc by 821 mAhr/g;
- said separator disposed at the interface between the first and second electrodes, wherein the area of the interface is between 12.6 cm2 and 13.2 cm2 and the ratio of the second electrode's electrochemical capacity to the first electrode's electrochemical capacity is between 1.33:1 and 1.40:1.
1 more element
An LR6 size electrochemical cell, comprising:
- a cylindrical container housing a first electrode defining a cavity therein, a second electrode having less than 50 ppm of mercury and disposed within said cavity, a separator located between said electrodes, and a quantity of alkaline electrolyte in contact with said electrodes and separator;
- wherein said first electrode comprises manganese dioxide as an electrochemically active material, said first electrode having an electrochemical capacity determined by multiplying the grams of manganese dioxide by 285 mAhr/g,
- wherein said second electrode comprises zinc as an electrochemically active material, said second electrode having an electrochemical capacity determined by multiplying the grams of zinc by 821 mAhr/g,
- wherein the ratio of the second electrode's electrochemical capacity to the first electrode's electrochemical capacity is between 1.33:1 and 1.40:1, and
- wherein said cell, if discharged at 250 milliamps constant current for one hour per day until said cell's closed circuit voltage falls below 0.90 volt, would have a minimum discharge efficiency of at least 81.0% based on said first electrode's electrochemical capacity.
2 more elements
An LR6 size electrochemical cell, comprising:
- a cylindrical container housing a first electrode defining a cavity therein, a second electrode having less than 50 ppm of mercury and disposed within said cavity, a separator located between said electrodes, and a quantity of alkaline electrolyte in contact with said electrodes and separator;
- wherein said first electrode comprises manganese dioxide as the electrochemically active material, said first electrode having an electrochemical capacity determined by multiplying the grams of manganese dioxide by 285 mAhr/g,
- wherein said second electrode comprises zinc as the electrochemically active material, said second electrode having an electrochemical capacity determined by dividing the grams of zinc by 821 mAhr/g,
- wherein the ratio of the second electrode's electrochemical capacity to the first electrode's electrochemical capacity is between 1.33:1 and 1.40:1, and
- wherein said cell, if continuously discharged at a rate of 100 milliamps for one hour per day until said cell's closed circuit voltage falls below 0.90 volt, would have a minimum discharge efficiency of at least 93.0% based on said first electrode's electrochemical capacity.
2 more elements
An electrochemical cell, comprising:
- a) a container housing a first electrode, said electrode defining a cavity therein, said cavity created by utilizing a cylindrical tool to impact mold said first electrode into a tubular configuration, said tool having a circumference of at least 29.12 mm, said container having an outer diameter between 13.89 mm and 14.00 mm;
- b) a separator lining said cavity and contacting said first electrode;
- c) a second electrode comprising zinc powder and disposed within said separator lined cavity, said zinc powder having a tap density greater than 2.80 g/cc and less than 3.65g/cc, a BET surface area greater than 400 cm2/g, a KOH absorption value of at least 14%, and a D50 less than 130 microns;
- and
- d) a quantity of alkaline electrolyte disposed within said container and in contact with said electrodes and said separator.
2 more elements
Dependencies are inferred from the claim text.