Lithium cell with improved iron disulfide cathode

Details Lithium cell with improved iron disulfide cathode Lithium cell with improved iron disulfide cathode

2009-03-27

2011-11-01

Rhee, Jane (Department: 1726)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S163000, C429S218100, C429S221000, C429S231950

Reexamination Certificate

active

08048562

ABSTRACT:
A primary cell having an anode comprising lithium or lithium alloy and a cathode comprising iron disulfide (FeS2) with calcium hydroxide Ca(OH)2and lithium carbonate Li2CO3additive mixed therein. The electrolyte may typically comprise lithium bistrifluoromethylsulfonyl imide, Li(CF3SO2)2N (LiTFSI) salt dissolved in a solvent mixture comprising 1,3-dioxolane and sulfolane. The electrolyte typically contains between about 100 and 2000 parts by weight water per million parts by weight (ppm) electrolyte therein. A cathode slurry is prepared comprising iron disulfide powder with Ca(OH)2and Li2CO3mixed therein, carbon, binder, and a liquid solvent. The mixture is coated onto a conductive substrate and solvent evaporated leaving a dry cathode coating on the substrate. The anode and cathode can be spirally wound with separator therebetween and inserted into the cell casing with electrolyte then added.

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