All solid-state lithium-oxygen batteries with MOF-derived nickel cobaltate nanoflake arrays as high-performance oxygen cathodes.

Solid-state Li1+xAlxGe2-x(PO4)3 electrolytes with high ionic conductivity were prepared and successfully applied in lithium-oxygen batteries (LOBs). Combined with MOF-derived NiCo2O4 cathodes, the solid-state LOBs deliver a high discharge capacity and good rate performance. Moreover, enabled by such a bifunctional cathode, the as-assembled solid-state LOBs show enhanced reversibility and long-term cycling stability over 90 cycles.