Theion sulfur-crystal EV battery developmentWith this chemistry, Theion is aiming for energy density of 1,000 Wh/kg, which is about triple that of leading-edge nickel manganese cobalt (NMC) cells today, including the 4680 cells used in the Tesla Cybertruck. Such energy density would allow for much lighter cells without sacrificing range, or increased range from the same volume. Theion claims it can achieve this without using nickel or cobalt, addressing environmental and human-rights concerns associated with the mining of those metals. Stellantis STLA Medium platformBut as Theion emphasizes, longevity in cycle life will be the challenge for sulfur-crystal batteries. But it remains to be seen if any of these efforts—Theion's included—will overcome the hurdles and get sulfur batteries into production EVs.