Superionic materials promise greater range, faster charges and more safety. In early 2025, Mercedes-Benz ran its first road tests of an electric passenger car powered by a prototype solid-state battery pack. The carmaker predicts the next-gen battery will increase the electric vehicle’s driving range to over 620 miles (1,000 kilometers). Credit: Mercedes-Benz Group Every few weeks, it seems, yet another lab proclaims yet another breakthrough in the race to perfect solid-state batteries: next-g...