As mentioned already, battery tech is changing fast. Toyota could be making the next step.
See..
http://www.wired.co.uk/article/toyota-solid-state-battery
There are many great ideas to potentially increase power density of batteries but getting them into a mass production state is a totally different game to creating in the lab.
See..
http://www.wired.co.uk/article/toyota-solid-state-battery
There are many great ideas to potentially increase power density of batteries but getting them into a mass production state is a totally different game to creating in the lab.