Are we there yet?
We might be close.
Planar Energy, a spinoff from the US Department of Energy Renewable Technology lab has developed a 3D printable solid state lithium battery with three times the energy density at half the cost of current generation Li-Ion batteries.
The hard process engineering part was to scale up the size of the batteries which had previously been difficult to do. The breakthrough is their 3D "printing style" deposition process which allows precise deposition of solid state nanoscale electrodes, doing away with the need for liquid.
Half the cost and three times the energy density?
A nissan leaf with a three hundred fifty mile range optimal conditions and two hundred mile range sub-optimal conditions would probably meet in excess of 90% of North American driving scenarios and higher still in Europe.
So are we there yet? Nearly.