How Vanadium redox battery are better?

Vanadium redox flow batteries are large, rechargeable batteries that use tanks of liquid and charged vanadium electrolytes to produce and store energy. Examples of the technology operate in power plants in the United States, Asia and Europe. Vanadium can take on multiple charges, so both sides of the battery use the same material this means that only one electro active element is needed. There is no damage if the battery solution leaks, so the batteries can last for about 20 years. Vanadium flow batteries are flexible in that they can be small enough to power a single solar panel or large enough to support an entire grid. The capacity of a battery is easily expanded by simply adding more solution. These batteries have low energy to volume ratio.