Perhaps the direction of improvement at this point is lifetime rather than energy density. 500 cycles was fine for portable electronics. Not so much for vehicle

Perhaps the direction of improvement at this point is lifetime rather than energy density. 500 cycles was fine for portable electronics. Not so much for vehicles. Double the lifetime for a 10% increase in upfront costs would be a huge win. It isn't sexy enough to make it into the news, but there is progress here.