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US 2013/0095358 A1Published application
Lithium Iron Disulfide Battery
AssigneeEveready Battery Company, Inc.
InventorsMark A. Schubert, Matthew T. Wendling, Weiwei Huang
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Abstract
A lithium-iron disulfide battery with improved high temperature performance is disclosed. The separator characteristics are deliberately selected to be compatible with the electrolyte at the intended temperature. Additional or alternative modifications can be made in the form of a scaffold or laminated structure. A preferred polymer for such separators is polyimide.
Claims6
An electrochemical cell comprising:
- an anode consisting essentially of lithium or a lithium alloy;
- a cathode coated onto a solid current collector, said cathode coating comprising iron disulfide as an active material;
- a high temperature polymeric separator comprising a polymer having a melting point;
- an electrolyte having a solubility parameter;
- wherein the anode, the cathode and the separator are spirally wound;
- and
- wherein, when the cell is discharged at a rate of 0.01 C or less and a temperature of 70° C. or greater, the solubility parameter of the electrolyte is large enough relative to the melting point of the polymer to prevent premature voltage dropoff.
4 more elements
An electrochemical cell comprising:
- an anode consisting essentially of lithium or a lithium alloy;
- a cathode coated onto a solid current collector, said cathode coating comprising iron disulfide as an active material;
- a high temperature polymeric separator having a scaffold structure comprising a first polymer and filling polymer comprising a second polymer;
- a liquid electrolyte that is distinct from the separator;
- wherein the anode, the cathode and the separator are spirally wound;
- wherein the liquid electrolyte is at least partially absorbed by the second polymer;
- and
- wherein the first polymer does not soften at an expected discharge temperature for the cell.
5 more elements
Dependencies are inferred from the claim text.