Solid state lithium-air based battery cell

A solid state battery device, the battery device comprising:

• a current collector region;
• a lithium containing anode member overlying the current collector region;
• an electrolyte material comprising a first garnet material overlying the lithium containing anode member, the electrolyte material having a density ranging from about 80 percent to 100 percent of a theoretical density associated with the first garnet material, the first garnet material comprising LaALiBZrCODXE where 2<A<4, 4<B<8, 1<C<3, 10<D<14, 0<E<2, and where X is one or more elements selected from the group consisting of Al, Sb, Ta, Nb, and Ba;
• a porous cathode material consisting essentially of a second garnet material overlying the electrolyte material, the porous cathode material having a porosity of greater than about 30 percent and less than about 95 percent, the second garnet material being LaALiBZrCODXE where 2<A<4, 4<B<8, 1<C<3, 10<D<14, 0<E<2, and where X is one or more elements selected from the group consisting of Al, Sb, Ta, Nb, and Ba;
• a carbon bearing material overlying a surface region of the porous cathode material, the carbon bearing material comprising substantially carbon material;
• an oxygen bearing source in contact with the surface region of the porous cathode material;
• and
• a current collector structure configured to expose the surface region to the oxygen bearing source, and having a conductivity in a predetermined amount.