Centre National Detudes Spatiales

Solvay (Societe Anonyme)

Denis Billaud

Patrick Willmann

Etienne Hannecart

Claude Franquinet

Abdelaziz Naji

Laurent Thevenot

Francedillaois Xavier Henry

The invention relates to additives to improve the reversibility of a carbon electrode of a lithium ion secondary electrochemical generator. These additives are composed of cyclic or non-cyclic &agr;-halogenated esters such as &agr;-bromo-&ggr;-butyrolactone or methyl chloroformiate. They may be added to the electrolyte at a rate of 0.5 to 3% by volume or adsorbed on the carbon electrode to form a passivation film on said electrode during the first use of the generator.

Additives for improving the reversibility of a carbon electrode of a lithium ion secondary electrochemical generator

Carbon product rich in lithium for use as negative electrode in a lithium cell

Polyacetylene-lithium insertion compound, its use in a storage battery

The invention relates to a process for the preparation of polymers based on polyindoles by chemical polymerization of indole in the presence of an oxidizing agent and of a solvent. The invention also relates to compositions and electroconductive devices containing the polyindoles thus obtained and to the use of the polymers obtained.

Process for the preparation of polyindoles, electroconductive

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Nancy, France

Denis Billaud