Glass Electrolyte Infiltrated Cathode in an All Solid State Lithium Cell

Abstract

Ion conducting glasses have been known for more than half a century, but their effective application in batteries is limited. Johnson Energy Storage is demonstrating a novel all solid state lithium battery construction which utilizes a lithium ion conducting glass to transport ions from deep within a structured cathode network. The unique application of the glass electrolyte is dependent upon a networked cathode structure, infiltration of the glass into the cathode and developing a glass with both sufficient ionic transport and a large voltage stability window. The advantages provided include continuity of transport channels and large contact surfaces between the active cathode material and the glass electrolyte. Both are required for effective transport and low impedance. Cells are shown with the potential for long cycle life and stability cycling from 3.0-4.3 volts utilizing a metallic lithium anode.