Glassy embedded solid-state electrode assemblies, solid-state batteries and methods of making electrode assemblies and solid-state batteries

A glassy embedded electrode assembly having first and second opposing major surfaces, the electrode assembly comprising:

• a composite material structure composed of first and second interpenetrating material components;
• wherein the first material component is a porous electroactive network comprising a solid electroactive material, the network having major opposing surfaces and a pore structure with open pores that extend into the network from the major opposing surfaces, the pores having interior pore surfaces;
• wherein the second material component is a continuous glassy medium comprising a Li ion conducting sulfide glass;
• wherein the glassy medium encapsulates the electroactive network in the form of a glassy cover region that is substantially devoid of crystalline particles;
• and
• wherein the glassy medium extends into the depth of the electroactive network to form a three-dimensional solid-state interface with the electroactive network.