Why do we need new technologies for long-duration energy storage?

Long-duration energy storage has received increasing amounts of coverage and interest over the past few years. Ultimately, this is driven by the need to maintain stability and supply and demand balances for electricity grids installing ever-increasing levels of variable renewable power sources. This premium article delves into why Li-ion is sub-optimal for long-duration energy storage, the key challenges for long-duration storage, and introduces some of the technologies being developed.