Nah. Its not the batteries that need the breakthrough. Its the charging point availability.
The Kia EV5 just started deliveries in the Chinese domestic market at a price point that is equivalent to US$20,000. They are competing with BYD who has also just introduced a pair of low-cost EVs that range in price from US$17,000-19,000 depending on options. When I first saw the Kia, I figured they hit that low price point with a tiny battery. Well, its relatively small pack at 64.2 kWh, but the small size of the car (it doesn't look small at all its a 4-seat SUV) gives it a 329-mile range.
The battery tech is here right now. All thats left is to get the things into volume production, and diversify/decentralize our grid like the Aussies (and now the Texans) are doing.
Oh and on-topic: I'm doing a Costco run today on my Bullitt, now that the rain has stopped. Right now its topping off the battery via my solar setup.