The pursuit of rechargeable solid-state Li-air batteries

Li-air batteries have received much attention in the past several years because of their large theoretical specific energy density, but the challenges with the electrolytes are the main hindrance for the development of Li-air batteries. Particularly, the electrolyte decomposition and reactivity with the discharge product Li2O2 in non-aqueous Li-air batteries (including organic solvents and ionic liquids) are severe. The solid-state electrolytes (including inorganic and polymer electrolytes), which are considered to be stable and compatible with Li2O2, will be promising alternatives to the vulnerable organic electrolytes. With the solid-state electrolytes, rechargeable solid-state Li-air batteries can be constructed and have been well studied. There is no specific review regarding the relatively new solid-state Li-air batteries. This review will include the current status, challenges, and perspectives of solid-state Li-air batteries.