Just read this on phys.org and this may pave the way for the ultimate car battery. Still a long way to go before it's available in electric vehicles but scientists have developed a working lithium-oxygen battery with very high energy density.
I theory, this would allow an electric vehicle in the current market to drive London to Edinburgh on a single charge with a battery that is a a fifth of the cost and weight of a current one.
Imagine this going into production? Or an electric battery in the current size but could travel 5 times farther?