The new developments in Aluminum-sulphur batteries look promising for this kind of grid buffering usage. https://arstechnica.com/science/2022/08/new-aluminum-s

The new developments in Aluminum-sulphur batteries look promising for this kind of grid buffering usage. https://arstechnica.com/science/2022/08/new-aluminum-sulfur-battery-tech-offers-full-charging-in-under-a-minute/ https://arstechnica.com/science/2022/08/new-aluminum-sulfur-...