A "Flow" Battery's got the advantage of scale. To scale a flow battery, all you gotta do is build a bigger tank. A Lithium Ion battery requires you to build complex circuitry and chemicals throughout the whole battery.
In many ways, Lithium Ion batteries are like Solid State Drives: You got complex circuitry through and through. While Flow batteries are more like a Tape Drive: The drive is way more expensive to make, but "tape" (ie: Tank) is so cheap that the economics of energy storage eventually wins out.
A "Flow" Battery's got the advantage of scale. To scale a flow battery, all you gotta do is build a bigger tank. A Lithium Ion battery requires you to build complex circuitry and chemicals throughout the whole battery.
In many ways, Lithium Ion batteries are like Solid State Drives: You got complex circuitry through and through. While Flow batteries are more like a Tape Drive: The drive is way more expensive to make, but "tape" (ie: Tank) is so cheap that the economics of energy storage eventually wins out.