Centre National De La Recherche Scientifique

Umicore

Mohamed Ati

Michel Bernard Armand

Jean-Marie Tarascon

Stijn Put

Kris Driesen

Jean Scoyer

Nadir Recham

Jean-Noel Chotard

Prabeer Barpanda

Michel Armand

A fluoro material is provided for use as an electrode active material as well as a process tar producing it. The material includes particles of a fluorosulfate which corresponds to formula (I) LFeMnSOF (I) in which 0&#x3c;x&#x2266;1 and 0&#x2266;y&#x3c;1. The material includes a phase of triplite structure and optionally a phase of tavorite structure, the phase of triplite structure representing at least 50% by volume. The material may be obtained from precursors of the elements of which it is constituted, via a ceramic route, via an ionothermal route or via a polymer route.

Fluoro material which may be used as an electrode active material

The invention relates to a method for preparing an alkali metal and transition metal fluorosulfate that is useful as an electrode material in an electrochemical battery that operates by alkali ion exchange. The method includes a first step that involves: preparing a mixture of precursors of elements making up fluorosulfate, placing said mixture in contact with a solid polymer at ambient temperature, subjecting the reaction medium to a heat treatment that aims to melt the polymer, and subsequently reacting the precursors with one another. Said polymer is one that is solid at ambient temperature, has a melting point lower than the reaction temperature of the precursors, is stable at least up to the reaction temperature of the precursors, and is soluble in a nonpolar aprotic organic solvent.

Method for preparing alkali metal and transition metal fluorosulfates

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Amiens, France

Mohamed Ati