From an engineering perspective other solutions may be superior for grid-scale stationary storage but li-ion batteries have been benefiting from economies of scale due to mobile computing and EVs.
One thing I don't see as much talk about but lithium ion batteries have both very low self-discharge and exceptional charge/discharge rates.
Also go out on a limb and say one of the reasons you didn't see grid battery storage till now was issues with the inverters. Inverters have gotten really performant, reliable, and cheap. Probably enough to do cycle level(ms) grid stabilization.
Also go out on a limb and say one of the reasons you didn't see grid battery storage till now was issues with the inverters. Inverters have gotten really performant, reliable, and cheap. Probably enough to do cycle level(ms) grid stabilization.