I think this article does a better job at explaining. https://www.hackster.io/news/a-high-frequency-blast-of-sound-could-push-future-batteries-to-a-nine-year-lifespan-ease-recycling-944c15f50f9f
From what I understand with this new battery, it's both easier to disassemble the lithium part for recycling and additionally the rusting MXene film used can be de-rusted with sound waves. Therefore when performance drops it allows the "electrical and electrochemical performance to be recovered".
https://en.wikipedia.org/wiki/List_of_countries_in_the_Eurovision_Song_Contest ;) Japan and south korea would be high on my shopping list