Improving the Durability of Amorphous Vanadium Oxide Thin-Film Electrode in a Liquid Electrolyte

We report on the effects of depositing a protective inorganic solid electrolyte coating on amorphous electrode in terms of long-term cycling efficiency and stability of the in a liquid electrolyte. Two thin-film electrodes were fabricated for extensive cyclic durability testing in a carbonate liquid electrolyte: One film had no overlying coating while the other had a protective thin film of solid lithium ion conducting The protected exhibited improved durability in terms of constant capacity with repeated cycling up to 800 cycles, while the uncoated electrode displayed significant capacity loss. Our results demonstrate that deposition of an inorganic solid electrolyte on amorphous films serves as a protective overlayer and enhances the long-term cycling efficiency and stability of the in a liquid electrolyte.