Argylium, formed in 2026 as a joint venture of Syensqo, Axens and IFPEN, develops and scales sulfide solid electrolytes for all‑solid‑state batteries. Its materials target ~500 Wh/kg, intrinsic thermal stability and fast charging for EVs, robotics and aerospace.
Argylium, founded in January 2026 and headquartered in Rueil-Malmaison, France, is a joint venture of Syensqo, Axens and IFPEN focused on the development and industrialization of sulfide solid electrolytes for all-solid-state batteries (ASSBs). Led by CEO Alessandro Chiovato, the company aims to supply high-performance electrolytes that enable higher energy density, intrinsic thermal safety, and faster charging. Its mission is to support the European battery value chain through targeted R&D, pilot-scale production, and technology licensing to accelerate commercialization of fourth-generation battery technologies.
Argylium develops proprietary sulfide solid electrolytes optimized for fourth-generation all-solid-state batteries. These inorganic electrolytes offer high ionic conductivity, enabling cell-level energy densities around 500 Wh/kg, fast charging capability, and improved intrinsic thermal stability versus liquid systems. The company maintains multiple electrolyte grades tailored for different cell architectures and temperature ranges. Capabilities include electrochemical testing, kilo-lab synthesis and a France-based pilot unit for scale-up and process validation. Secured access to critical raw materials and industrial process expertise supports qualification by battery manufacturers.
Argylium supplies customized high-performance sulfide solid electrolytes in multiple grades for ASSBs. Products are designed for higher energy density, improved thermal safety and fast charging, with support for qualification and pilot production. Target sectors include electric vehicles, robotics, aerospace and medical implants.
Formation of the Argylium JV in January 2026 by Syensqo, Axens and IFPEN initiated its initial project activity. The company operates a Paris research center for electrolyte prototyping and a La Rochelle development center with a kilo‑lab and an operational pilot unit in France for pilot‑scale synthesis and electrochemical validation, supporting industrial demonstration and customer qualification.
Argylium is owned as a joint venture by Syensqo, Axens and IFPEN, combining industrial chemistry, materials science and battery testing capabilities. The company plans two major funding rounds within three years to finance large-scale pilot units and capacity ramp-up to support commercialization and licensing.
