International Business Machines Corporation
Electrochemical energy storage devices with sodium-ion conducting solid-state electrolytes

Abstract:

Electrochemical energy storage devices are provided comprising an anode, a cathode and a solid-state electrolyte adapted for Na-ion conduction between the anode and cathode. The solid-state electrolyte includes, for example, a solid solution of doped NaAlO.sub.2 having a composition defined by one of D.sub.x(NaAlO.sub.2).sub.1-x in which D is at least one of GeO.sub.2, SnO.sub.2, TiO.sub.2, ZrO.sub.2 and HfO.sub.2, and D.sub.x/2(NaAlO.sub.2).sub.1-x in which D is PAlO.sub.4, where 0<x.ltoreq.0.5. Other solid-state electrolyte compositions are also disclosed.