Fluorine to Boost Lithium

In recent times, various research on the benefits of direct fluoridation of lithium av_dropcap2-based electrodes have appeared in the scientific literature. In an article published earlier this year, Professor Gerbrand Ceder and his team at the University of Berkeley1 explain that fluoride substitution is an essential catalyst to improve the lifespan and energy density of thirsty Li-ion battery cathode materials.  Due to the high Li-F interaction, it is anticipated that fluorine can also alter the order of cations at short distances in these materials, which is essential for transporting Li ions. The theoretical study highlights the fact that for high fluoride substitution rates (above 15%) the effects are always beneficial.

Employees of the French network of RS2E,2 batteries studied direct fluoridation of LTO using xenon fluoride XeF2, an effective and more accessible fluoridation agent than fluoride gas, but particularly expensive. In an article published in August 2019, they propose a very detailed analysis of the materials obtained.  This article echoes a May 2019 publication, the result of the Israeli-German collaboration of Professors Doron Aurbach and Ingo Krossing ,3 which describes the direct fluoridation of HE-NCM cathode materials and its remarkable effect on battery capacity and stability.

This work highlights the potential of direct fluoridation to modify the properties of materials and molecules. In order to facilitate access to fluoride gas and allow the scientific community to explore the multiple possibilities of fluoridation in fields as diverse as energy, pharmaceutical chemistry or semiconductors, SUDFLUOR will soon bring to market a fluoride generator using innovative technology. Producing and using fluoride has never been so simple and affordable.

BIBLIOGRAPHY 1. Effect of Fluorination on Lithium Transport and Short-Range Order in Disordered-Rocksalt-Type Lithium-Ion Battery Cathodes , Bin Ouyang, Nongnuch Artrith, Zhengyan Lun, Zinab Jadidi, Daniil A. Kitchaev, Huiwen Ji, Alexander Urban and Gerbrand Ceder – Department of Materials Science and Engineering, UC Berkeley, Berkeley, CA, 94720 USA Atomic Layer Fluorination of the Li4Ti5O12 Surface: A Multiprobing Survey, Youn Charles-Blin, Delphine Flahaut, Jean-Bernard Ledeuil, Katia Guérin, Marc Dubois, Michael Deschamps, Anne-Marie Perbost, Laure Monconduit, Hervé Martinez, Nicolas Louvain – Universities of Clermont Auvergne, Montpellier, Orleans and Pau Fluorination of Li-Rich Lithium-Ion-Battery Cathode Materials by Fluorine Gas: Chemistry, Characterization, and Electrochemical Performance in Half Cells, Ulf Breddemann, Evan M. Erickson, Victoria Davis, Florian Schipper, Mathias Ellwanger, Michael Daub, Anke Hoffmann, Christoph Erk, Boris Markovsky, Prof. Dr. Doron Aurbach and Prof. Dr. Ingo Krossing, Bar-llan University, Israel et Materialforschungszentrum (FMF), Universität Freiburg, Allemagne – Mai 2019