IMPROVED ELECTROCHEMICAL CELLS FOR HIGH-ENERGY BATTERY USE

Components and structures for a rechargeable electrochemical cell and an electrochemical cell having an S02 solvent based electrolyte comprising any of said components and structures are provided. The cathode () may comprise one or more elemental transition metals and/or one or more partially oxidized transition metals. The S02 solvent based electrolyte () may comprise halide-containing salt additive as an SEI-forming additive. The anode current collector () may comprise a carbon coated metal, an alloy of two or more metals or a carbon coated alloy of two or more metals. The electrochemical cell may comprise excess non-dissolved/solid alkali halides. The components, structures and cell may bay used in a device.