May 2026
Engineering novel mixed-anion compositions towards sustainable energy materials
Abstract
Electrochemical systems for energy storage play a pivotal role in the ongoing energy transition. A key priority lies in advancing research into novel chemical compositions that are highly performant and minimize reliance on scarce mineral resources for solid-state electrolytes and cathode materials.
Our work explores the synthesis of mixed-anion materials, where multiple anions are combined within the same framework such as oxyhydrides (O2−/ H−), oxychlorides (O2−/Cl−) and others. While traditional research has focused on tuning the cationic content of materials (e.g., LiCoO2 → LiNi1−x−yMnxCoyO2), mixing anions enables the design of new crystal structures, ordering, chemical bonding and in turn leads to novel chemical and physical properties. In Li- and Na-ion solid-state electrolytes, tuning the immobile anionic sublattice enhances the ionic conductivity. In the case of cathode materials, mixing anions allows engineering chemical bonding which modifies the redox properties of the materials.
In this talk, we will present our exploration of “mixed-anion chemistry” as an alternative to “cationic chemistry”, which has led to the discovery of innovative compounds for energy storage.
Biography
Cédric Tassel obtained his Master’s degree in Material Chemistry from the University of Rennes (France) in 2007 and received his PhD in Chemical Engineering from Kyoto University (Japan) in 2010. Cédric was appointed Hakubi program-specific assistant professor in the Graduate School of Engineering in 2012 and later was promoted to associate professor in 2015. Cédric moved to the Institute of Condensed Matter Chemistry of Bordeaux (ICMCB) and the Graduate School of Chemistry and Physics of Bordeaux (ENSMAC) of Bordeaux INP as a professor in September 2024. He is the head of the Chair for the Durability and Recyclability of Materials for Energy (DREAME) of the Nouvelle-Aquitaine region of France. His research focuses on developing new chemical compositions for energy materials towards better performance and sustainability.