MULTILAYER SOLID ELECTROLYTES AND BATTERIES CONTAINING THE SAME

A solid electrolyte comprises a lithium lanthanum zirconium oxide (LLZO) solid electrolyte layer, a FeOCl—LiCl solid electrolyte layer, and an intermediate layer disposed between the LLZO layer and the FeOCl—LiCl layer. The intermediate layer comprises lithium (Li), oxygen (O), and at least one of phosphorous (P) and carbon (C).