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US 8,785,044 B2Granted
Lithium-iron disulfide cathode formulation having pyrite content and low conductive additives
AssigneeEveready Battery Company, Inc.
InventorsJack W Marple, Weiwei Huang, Michael W Wemple
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Abstract
The invention relates to primary electrochemical cells having a jellyroll electrode assembly that includes a lithium-based negative electrode, a positive electrode with a coating comprising iron disulfide deposited on a current collector and a polymeric separator. More particularly, the invention relates to a cell designs and cathode formulations incorporating specific types of conductors to improve cell performance.
Claims16
An electrochemical cell comprising:
- a cylindrical housing;
- a nonaqueous electrolyte including an organic solvent and a spiral wound electrode assembly disposed within the housing;
- wherein the spiral wound electrode assembly includes an anode consisting essentially of lithium or a lithium alloy and a cathode mix coated onto a foil current collector at a final solids packing percentage of at least 58% and no more than 63%;
- wherein the cathode mix comprises at least 95 wt. % of pyrite, less than 2 wt. % of a binder and less than or equal to 2 wt. % of conductors;
- and
- wherein the conductors include graphite and at least 50 wt. % of acetylene black.
3 more elements
An electrochemical cell comprising:
- a cylindrical housing;
- a nonaqueous electrolyte including an organic solvent and a spiral wound electrode assembly disposed within the housing;
- wherein the spiral wound electrode assembly includes an anode consisting essentially of lithium or a lithium alloy and a cathode mix coated onto a foil current collector at a final solids packing percentage of at least 58% and no more than 63%;
- wherein the cathode mix comprises at least 95 wt. % of pyrite, less than 2 wt. % of a binder and less than or equal to 2 wt. % of conductors;
- and
- wherein the conductors include graphitized carbon and graphite.
3 more elements
Dependencies are inferred from the claim text.