Batteries. The lifeblood of our mobile devices and ironically also somewhat their Achilles heel. Although the evolution of lithium-ion batteries has made all these portable electronic devices possible, they haven't really caught up with the growing power that we keep in our pockets. That's not even considering yet the similarly growing obsession over thinner devices, which would require thinner batteries that deliver the same power. Stanford University researchers, lead by chemistry professor Dai Hongjie, might have stumbled on the answer in a new variant of an aluminum-ion battery.