Lithium-ion is the cheapest form of stationary storage for the sub-8 hour duration niche. The vast majority of battery storage being deployed is lithium-ion. S

Lithium-ion is the cheapest form of stationary storage for the sub-8 hour duration niche. The vast majority of battery storage being deployed is lithium-ion. Sodium-ion is the second largest contender, with a few pilot facilities opening in China recently, but it will be a few years before it eclipses lithium-ion.