US military research into lower risk alternatives to lithium-ion batteries has led to the development of a new nanoelectrofuel for use in flow batteries. Flow batteries currently address all the downsides of lithium-ion batteries but can't deliver the same energy density - until now. Researchers have discovered that by adding nanofluids to the normal aqueous solutions (electrolytes), they can boost a flow battery's energy density by 15 to 25 times, making it comparable to any petrol-powered vehicle, much less lithium-ion battery EV's - without any of the associated downsides of either!