SOLID-STATE ELECTRODE HAVING INTEGRATED SULFIDE SEPARATOR

In general, a solid-state electrode includes an electrode composite layer comprising a plurality of active material particles mixed with a solid electrolyte buffer material comprising a first plurality of solid electrolyte particles layered onto and directly contacting a current collector foil, and an electrically non-conductive separator layer comprising a second plurality of solid electrolyte particles layered onto and directly contacting the electrode composite layer. In some examples, an interpenetrating boundary layer is disposed between the electrode composite layer and the electrically non-conductive separator layer. In some examples, the electrode composite layer includes one or more conductive additives intermixed with the plurality of active material particles, and the electrode composite layer is electrically conductive. In some examples, the electrode composite layer is adhered together by a binder.