A truly solid, highly conductive electrolyte has been designed, bringing solid-state lithium batteries within reach. Batteries store energy chemically and rely on the movement of charged ions between a cathode and an anode, through an electrolyte. For most of battery history, this electrolyte has been a liquid, although research has long sought a solid alternative. Polyethylene oxide (PEO)-based solid polymer electrolytes were developed in the 1970s, and have many attractive properties, including safety.

https://www.miragenews.com/high-performance-solid-battery-electrolyte-1078044/

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