Lithium cell with improved iron disulfide cathode

Abstract

A primary cell having an anode comprising lithium or lithium alloy and a cathode comprising iron disulfide (FeS2) with calcium hydroxide Ca(OH)2 and lithium carbonate Li2CO3 additive 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)2 and Li2CO3 mixed 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.

Dependencies are inferred from the claim text.