theion GmbH develops crystalline lithium–sulfur battery technology designed to power mobile and stationary applications. The company focuses on sulfur battery cells intended for grid, residential, and industrial use, and also targets markets such as air mobility, land mobility, and aerospace. On the company website, theion positions its product as a ‘Crystal Battery’ with goals around high energy density, fast charging, long cycle life, high safety, and sustainability - highlighting sulfur as an industrial byproduct and emphasizing that its battery chemistry avoids cobalt and nickel.
Built around a direct crystal-imprinting approach for growing sulfur wafers and a proprietary solid-state polymer electrolyte concept, theion describes its battery technology as intrinsically safer and aimed at reducing costs over the full lifespan. The company’s roadmap outlines a phased progression from proprietary anode technology for cell enhancement to lithium-sulfur cells with targets for energy density and cycle life. Based in Berlin, theion operates with a team of scientists, engineers, and entrepreneurs and communicates its progress through press releases and technical updates on its website.
