Apple Inc.
Solid solution cathode for solid-state battery

Abstract:

A cathode for a solid-state battery comprises a composite cathode active material formed of a layered lithium cobalt oxide (LCO) in a solid solution matrix of lithium oxide (Li.sub.2O) and a cobalt oxide phase. For example, the composite cathode active material can be layered LCO in a solid solution matrix of one of Li.sub.2O--Li.sub.xCo.sub.1-xO--Co.sub.3O.sub.4, Li.sub.2O--Li.sub.xCo.sub.1-xO and Li.sub.2O--Co.sub.3O.sub.4, with 0.ltoreq.x.ltoreq.0.5. The LCO is at least 80 wt. % of the composite cathode active material. The cathode is a sintered solid-state cathode wafer that is free-standing, upon which solid-state battery cells are fabricated.