NOVELTY - The device has an active material region expanding/contracting from first volume to second volume during charge/discharge. Catholyte material is spatially confined in spatial regions not occupied by active regions. Oxygen specie is placed within sulfur material. Protective material overlying exposed regions of the active material maintains sulfur species within the catholyte material and prevents interaction of sulfur containing species with an element within the active regions. Polymer material is being configured within vicinity of the catholyte material.    USE - Energy storage device i.e. solid-state lithium battery cell, for use in electric automobiles and hybrid automobiles.    ADVANTAGE - The device provides a structure for the catholyte material so as to improve total ionic conductivity for a cathode, thus allowing higher mass loading of active material, faster charge/discharge and a wider range of operating temperature, while eliminating a need for a flammable liquid electrolyte in a safe manner. The device enables increasing accessible active material mass loading per surface area so as to improve overall system energy density by increasing the ratio of active material to inactive components including current collectors and separators with reduced voltage loss, thus reducing porosity and increasing density of the cathode, while improving performance, electrochemical cycling stability, energy density and power density in a cost-effective manner.    DETAILED DESCRIPTION - The catholyte material is selected from a group consisting of lithium, germanium, phosphorus, LGPS sulfur material, silicon, LSPS sulfur, lithium-silicon-lead-sulfur and lithium-germanium-phosphorus-sulfur. The polymer material includes lithium species. The active material is selected from a group consisting of iron, fluorine, nickel cobalt aluminum oxide, lithium manganese nickel oxide, lithium cobalt oxide, nickel fluoride and copper fluoride. INDEPENDENT CLAIMS are also included for the following:    (1) a solid catholyte material    (2) a process for making solid catholyte material    (3) doped sulfur material.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating mixing of cathode active material with catholyte to improve overall ion conductivity.