The actual article rather than the breathless Yahoo.
https://techxplore.com/news/2023-03-electrolyte-enables-high-efficiency-safe.html
Except it doesn't tell us much.
Except in small portable things, Lithium Ion isn't used now. Solar and EV use Lithium Iron Phosphate which has a very low risk and less toxic production / materials.
Periodically there have been announcements of better batteries in the last 80 years. Some have become reality.