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Actually, there have been. Leaving aside the constant improvements in batteries that are ongoing:

http://en.wikipedia.org/wiki/Lithium-ion_battery#Modern_batt...

There have also been breakthroughs in the last five years to allow for massively faster charging:

http://en.wikipedia.org/wiki/Lithium-ion_polymer_battery#Tec...

We've been spoiled by Moore's Law in technology. In comparison, all the "battery breakthroughs" of the past decade are pretty feeble. If someone could double or triple the energy density of a battery, that would be a breakthrough.

Unfortunately, there's another discipline where energy density is important: explosives. The critical difference is in how quickly the energy is released, and as Li-Ion batteries show it isn't always as controllable as we'd like.

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