This car claims to run on salt water. It is not sea water, I suspect is is a Bromide salt. The energy storage is a cross between a battery and a fuel cell, th electrolytes are stored in separate tanks and pumped across a membrane that separates the two. This is where the ion exchange happens. The electrolytes can be changed out, restoring a full charge in minutes, unlike a conventional lithium battery that takes hours to charge up. NASA developed the technology in the 1970s. The super car has ultra capacitors to store charges for peak acceleration demands.
912 horsepower QUANT e-sportlimousine runs exclusively on salt water
Flow battery - Wikipedia, the free encyclopedia
http://www.messib.eu/about_project/M..._batteries.php
