Research at the California NanoSystems Institute at UCLA have been able to develop a new method of depositing lithium without corrosion being a factor. 

The UCLA investigators developed a technique that prevents that corrosion and showed that, in its absence, lithium atoms assemble into a surprising shape—the rhombic dodecahedron, a 12-sided figure similar to the dice used in role-playing games like Dungeons and Dragons.

I for one look forward to cell phone batteries that last a week on a charge.