New lithium-ion battery design that’s 2,000 times more powerful, recharges 1,000 times faster
http://www.extremetech.com/computing...0-times-faster
In essence, a standard li-ion battery normally has a solid, two-dimensional anode made of graphite and a cathode made of a lithium salt.
The new Illinois battery, on the other hand, has a porous, three-dimensional anode and cathode. To create this new electrode structure, the researchers build up a structure of polystyrene (Styrofoam) on a glass substrate, electro-deposit nickel onto the polystyrene, and then electro-deposit nickel-tin onto the anode and manganese dioxide onto the cathode.

I will definitely read about this 'super-capacitor', too. I may need a new battery for N900 a month or two later, and I would prefer to see a high-capacity high-technology battery replacing BL-5J. It's not like there isn't demand for them. Polarcell is a good example of increased-capacity battery, and I would be curious to see what kind of work they were doing to get this advantage for their products.
Meantime, I am reading science fiction.
Best wishes.
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Per aspera ad astra...