Saft

Alcatel Alsthom Compagnie Generale D'electricite

Alcatel

Bernard Simon

Patrick Bernard

Jean-Pierre Boeuve

Philippe Biensan

Sylvie Barusseau

Serge Flandrois

Philippe Chenebault

Florence Martin

Odile Godiveau

Damien Gallet

Annie Fevrier

Michel Hilaire

Jean-Francois Cousseau

The present invention consists in a binder for an electrode in an electrochemical system with a non-aqueous electrolyte, characterized in that it contains acrylonitrile-butadiene rubber and carboxymethylcellulose with an average molecular weight of over about 200 000.

Binder for an electrode of an electrochemical system with a non-aqueous electrolyte

The present invention concerns an electrode for a rechargeable lithium cell, containing an electro-chemically active material with general formula ##EQU1## where M is at least one transition metal selected from nickel, cobalt, manganese, and iron, A is selected from magnesium and calcium, and D is at least one element selected from the elements of groups 4b to 5a of the periodic classification.

Lithium electrode for a rechargeable electrochemical cell

The present invention relates to the use of an organic acid compound for substantially eliminating the presence of free LiOH in an ink composition for positive electrodes, wherein said organic acid compound is chosen from the set constituted by: (.alpha.) C.sub.1 -C.sub.4 carboxylic acids; (.beta.) C.sub.2 -C.sub.4 fluorocarboxylic acids; (.gamma.) anhydrides thereof; and (.delta.) mixtures thereof. It also relates to a positive electrode ink containing said organic acid compound, and to a method of preparing said ink.

Composition for a positive electrode, a method of preparing said

The invention concerns an anode for a rechargeable lithium cell, comprising a conductive support and a paste containing an electrochemically active material into which lithium can be inserted and a polymer binder, the anode being characterized in that the binder is selected from polyvinyl alcohol, polyvinyl butyral, and copolymers and mixtures thereof.

Anode for a rechargeable lithium cell and a method of manufacturing it

The present invention concerns a rechargeable lithium electrochemical cell comprising an anode containing a carbon-containing material with a degree of crystallinity which is greater than 0.8 and an electrolyte comprising a lithium salt and a mixture of at least two aprotic organic solvents, of which the first solvent has a high dielectric constant and the second solvent has low viscosity. The electrolyte further contains a soluble compound of the same type as at least one of said solvents and contains at least one unsaturated bond, and which can be reduced at the anode at a potential of more than 1 volt with respect to lithium to form a passivation layer.

Rechargeable lithium electrochemical cell

The present invention concerns a carbon anode for a lithium rechargeable electrochemical cell, comprising a graphite-containing carbon-containing material which includes, prior to electrical cycling, at least a first phase constituted by graphite having a rhombohedral crystal structure and comprising a fraction of more than 10%.

Carbon anode for a lithium rechargeable electrochemical cell and a

The present invention provides a liquid cathode lithium cell including an electrolyte and a carbon-based electrode, said cell being characterized by the fact that said electrode is composed of a mixture of a carbon-containing material and of a binder to which an electroactive compound is added, said electroactive compound being more oxidizing than said electrolyte and having a reduction potential that is greater than 3 volts measured relative to a lithium electrode, the proportion of said electroactive compound lying in the range 10% to 80% by weight of said mixture.

Liquid cathode lithium cell

A rechargeable electrochemical cell comprising a cathode, a liquid electrolyte with a solute and at least one solvent, an anode containing a highly crystallized carbon-containing material capable of intercalating lithium ions, said electrochemical cell being characterized by the fact that the surface of said carbon-containing material is provided with a thin layer which is impermeable to said electrolyte solvent, but which allows lithium to be diffused.

Rechargeable electrochemical cell having a liquid electrolyte, and a

A rechargeable electrochemical cell comprising a cathode, an anode based on a carbon-containing material capable of intercalating lithium ions, and an electrolyte constituted by a cross-linked polymer incorporating a lithium salt and a dipolar aprotic solvent. At least the surface of the carbon-containing material is less crystallized than graphite so as to be impermeable to said solvent, while allowing the lithium to diffuse.

Growing community of inventors

Issy les Moulineaux, France

Bernard Simon