[PhantomPholly]

An artificial coating of the Anode may revive an old battery chemistry.

http://www.batterypoweronline.com/news/nrel-research-overcomes-major-technical-obstacles-in-magnesium-metal-batteries/

Advantages:

• Magnesium is cheaper and more plentiful than Lithium
• Magnesium gives up 2 electrons vs 1 for Lithium, so has the potential for double the energy density