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Flow batteries: 5 times the storage at 1/5 the cost in 5 years

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So filling stations would simply replace their gasoline tanks with lithium polysulfide tanks and big charging stations. A car pulls in, the spent liquid in the car is pumped out and fresh, charged liquid pumped in and it's refueled. The station then just recharges the fuel for the next customer. Sounds great, but the best laid plans ...
 
does someone knows the cost of the vanadium salts being used to make the ion solution? How toxic is the solution?

Toxicity on experimental animals :
Vanadium compounds are acutely toxic by most routes of exposure,
in most species. In general, the toxicity of vanadium compounds increases
with the Oxidation State. The rabbit and guinea pig are more sensitive than
the rat and mouse. Repeated administration of vanadium compounds
produces changes in protein metabolism, lipid profile, enzyme activities,
reproductive activities, and other metabolic actions. Due to poor absorption
from the gastrointestinal tract, the metal is not very toxic for human beings
when ingested.
Toxicity on human beings :
In the past, vanadium compounds were prescribed as therapeutic
agents for anaemia, chlorosis, tuberculosis and diabetes. Vanadium was also
used as an antiseptic, a spirochetocide and as a tonic. Clinical picture of
poisoning shows a broad spectrum of toxic effects of vanadium on the
respiratory, circulatory and central nervous systems, the digestive organs,
kidneys, and skin (Table 2). Vanadium poisoning in humans can be
diagnosed on the basis of a history of exposure, the clinical picture, a green
tongue (due to the hexa-aqua ion), and measurements of vanadium levels
in blood cells, plasma and urine. The value of various tests of the secondary
metabolic effects of poisoning is disputed. Dimercaprol and ascorbic acid
may have value in the treatment of poisoning in human beings. There are
no adequate epidemiological studies of mortality in occupationally exposed
populations.

http://www.ajes.in/PDFs/05-2/15-Vanadium%20Toxicity.pdf