Abstract: The present invention provides a solid electrolyte material which may be used in solid-state batteries including semi-solid flow batteries. The resulting solid-state battery may have improved cyclability and increased cycle life. The lithium-based solid electrolyte material may comprise a lithium-based solid electrolyte material comprising Li3+xAxB2?xSi2PO12?dCd wherein A is a trivalent metal, B is a transition metal, C is a halogen or sulfur, x is 0.01 to 0.5, and d is 0 to 12. In an alternate embodiment, the present invention provides a hybrid solid electrolyte comprising the lithium-based solid electrolyte material comprising Li3+xAxB2?xSi2PO12?dCd wherein A is a trivalent metal, B is a transition metal, C is a halogen or sulfur, x is 0.01 to 0.5, and d is 0 to 12, a polymer solid electrolyte and an inorganic salt.

Abstract: The present invention provides a solid-state battery which includes a cathode, an anode, and a hybrid solid electrolyte. In one embodiment, the anode or cathode may be conventional anodes or cathodes, or the anode may be formed by printing a printable lithium composition being on a solution basis of a) 5 to 50 percent of lithium metal powder, b) 0.1 to 20 of a polymer binder compatible with the lithium metal powder, and c) 0.1 to 30 percent of a rheology modifier compatible with the lithium metal powder, and d) 50 to 95 percent of a nonpolar solvent compatible with the lithium metal powder and with the polymer binder. The hybrid solid electrolyte may be a lithium-based solid electrolyte material comprising Li3+x Ax B2?x Si2 PO12?d Cd wherein A is a trivalent metal, B is a transition metal, C is a halogen or sulfur, x is 0.01 to 0.5, and d is 0 to 12, a polymer solid electrolyte and an inorganic salt.