26 May '16, 2pm

@CleanTechnica

A gravity-based design is certainly not suitable for cars. A pump-based one may be but flow batteries tend to have way lower energy and power densities than what is required in cars. Also, round-trip efficiency of flow batteries are in the 60-80% region which compares badly with the 95%+ of Li batteries. Now, this chemistry seems to have higher roundtrip eff (91%) but there is no word on densities. If they can make the storage material cheap enough and the roundtrip efficiency high, this might prove to be an excellent grid-battery. With sufficiently cheap medium and energy density, this may be even used for seasonal storage.

Full article: http://cleantechnica.com/2016/05/26/hourglass-energy-stor...

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