BATTERY ELECTROLYTE

The present disclosure relates to a solid-state battery cell and methods for its manufacture. The battery cell includes a silicon-based anode with a sulfide anolyte, a nickel cobalt manganese cathode with an oxychloride catholyte, and a bi-layer solid electrolyte separator that is positioned between and in direct contact with the anode and the cathode. The separator includes a first layer of sulfide-type solid electrolyte adjacent to the anode and a second layer of oxychloride-type solid electrolyte adjacent to the cathode.