Back to results
US 8,617,743 B2Granted
Anode balanced lithium-iron disulfide primary cell
AssigneeThe Gillette Company
InventorsSteven J. Specht, Michael Pozin, Yelena Kouznetsova, Bhupendra K. Patel, Fred J. Berkowitz
Life of this patent
Estimating the term…
Abstract
A primary electrochemical cell having an anode comprising lithium and a cathode comprising iron disulfide (FeS2) and carbon particles. The cell is balanced so that the anode is in theoretical capacity excess (mAmp-hrs) compared to the theoretical capacity of the cathode. The anode and cathode can be spirally wound with separator therebetween and inserted into the cell casing with electrolyte then added. The electrolyte comprises a lithium salt dissolved in organic solvent.
Claims10
A primary AA-size electrochemical cell comprising:
- a housing;
- a positive terminal and a negative terminal;
- an anode comprising at least one of a lithium metal and lithium alloy as anode active material;
- a cathode comprising iron disulfide (FeS2) as cathode active material and conductive carbon;
- a separator sheet between the anode and the cathode;
- wherein the cell is balanced so that a ratio determined by a theoretical capacity of the anode (mAmp-hrs) divided by a theoretical capacity of the cathode (mAmp-hrs) is greater than 1.0, the theoretical capacity of the anode and the theoretical capacity of the cathode are based on a dischargeable portion of the anode and a dischargeable portion of the cathode that have the separator therebetween;
- the anode and the cathode must be opposite to and facing one another with the separator disposed therebetween in order for the anode and the cathode to be dischargeable;
- and
- the theoretical capacity of the cathode is between approximately 3300 mAmp-hrs and approximately 4500 mAmp-hrs.
6 more elements
Dependencies are inferred from the claim text.