Glass solid electrolyte layer, methods of making glass solid electrolyte layer and electrodes and battery cells thereof

A method of making a unitary Li ion conducting glass structure, the method comprising:

• i) providing a substantially dense and flat Li ion conducting sulfide glass substrate, the substrate having first and second opposing major surfaces;
• ii) etching a hole pattern into one or both major surfaces to produce a plurality of discrete spaced-apart closed end holes and/or trenches, wherein the etching involves contacting the substrate surface with an etching media.

17-19. (canceled)

(canceled)

24-33. (canceled)

A battery cell comprising a solid electrolyte glass substrate, comprising a unitary Li ion conducting glass structure comprising:

• a substantially flat Li ion conducting sulfide glass substrate having first and second major opposing surfaces, the glass substrate having a first porous glass portion that is characterizable as a first porous sublayer with a certain thickness and a dense glass portion that is characterizable as a dense glass sublayer with a certain thickness, wherein the first porous sublayer comprises a first plurality of discrete closed-end substantially vertical holes and/or trenches that extend into the substrate from the substrate first major surface to a predetermined depth, the first porous sublayer defining a hole and/or trench pattern on the first major surface;
• and further comprising active cathode material disposed inside the holes.

35-36. (canceled)