[PStechPaul]

This seems interesting, and the research is being done at our own University of MD:

http://www.ecnmag.com/news/2015/05/...t-all?et_cid=4558249&et_rid=45573081&type=cta

A battery made of all one material created by engineers at UMD. The electrolyte (green) forms the basis of the battery, and the electrodes at top and bottom are created by adding carbon (gray). This solid-state battery is forty times thicker than current examples, which are made with thin films. Image: Maryland NanoCenter

 

[PhantomPholly]

No discussion of energy density nor power density. My bet is it will turn out that it is simply another type of capacitor - a curiosity not practical for other purposes. But, I will hope that I am wrong...

 

[samwichse]

Weird... so theoretically this battery is reversible? Drain it flat and charge it backwards should be possible if both electrodes are the same material... that would be an odd duck.