Solid electrolytes 37 Polyelectrolytes 9 Solid-State Batteries 8 Electrodes 7 Solid oxide fuel cells (SOFC) 7 Ions 6 Lithium compounds 6 Solid state devices 6 Anodes 5 Cathodes 5 Electrochemical impedance spectroscopy 5 Proton exchange membrane fuel cells (PEMFC) 5 Sintering 5 All-solid state 4 Ethylene 4 Lithium-ion batteries 4 Morphology 4 Synthesised 4 Yttria stabilized zirconia 4 Yttria-stabilized zirconia electrolyte 4 Yttrium oxide 4 Activation energy 3 All-solid-state battery 3 Alumina 3 Aluminum oxide 3 Decomposition 3 Dielectric properties 3 Hydrogen 3 Mechanical milling 3 Oxygen 3