A High-Voltage, Solid-State Battery System

Abstract

The cell fabrication processes were studied of a high‐voltage, solid‐state battery system, . Thin‐film cells were made by the following procedures: (a) was sprayed on a Ag foil and run through a three‐zone furnace to melt the film on the foil; (b) electrolyte was vacuum deposited on the film; (c) Li was vacuum deposited on the electrolyte. In order to obtain a pinhole‐free electrolyte layer, the thickness of the film must be in excess of 5µ The yield of the thin‐film cells with the expected open‐circuit voltage of 2.1V was affected by the substrate temperature during Li deposition. It was found that, when the temperature of the substrate was properly controlled and the thickness of the film exceeded 15µ, the yield could be as high as 95%.