Recent solid-state battery announcements by Volkswagen and QuantumScape are raising hopes in the electric-vehicle market, but automotive battery experts are warning that the road to widespread, solid-state success is still a long and arduous one. A single breakthrough, as if from above, is not likely to turn the whole industry on its nose anytime soon. “Solid-state is a great technology,” noted Bob Galyen, owner of Galyen Energy and former chief technology officer for the Chinese battery giant ...