Benefiting from advantages such as good safety

high energy density and long cycle life

all-solid state lithium battery becomes one of the most promising energy storages. However

as an important component of solid lithium battery

solid-state electrolyte still has many problems like low ionic conductivity at room temperature and poor interface properties

which restrict the commercial progress of solid-state lithium battery. This state-of-the-art review provides current researches of outstanding solid-state electrolytes including the solid-state polymer electrolyte

inorganic oxide based lithium ion conductor and inorganic sulfide based lithium ion conductor

summarizes their characteristics and tries to find a promising way for future solid electrolyte.