Saft

Alcatel Alsthom Compagnie Generale D'electricite

Jean-Pierre Boeuve

Bernard Simon

Andre Lecerf

Philippe Biensan

Christian Jordy

Claudette Audry

André Lecerf

An electrochemically active material resulting from substituting a portion of the nickel in a single-phase composite oxide of nickel and lithium of the LiNiOtype, characterized in that the active material satisfies the formula:Li(MLiMM)Oin which: 0.02&#x3c;a&#x2266;0.25; 0&#x2266;b&#x3c;0.30; 0&#x2266;c&#x3c;0.30; (a+b+c)&#x3c;0.50; Mis at least one element selected from Al, B, and Ga; Mis at least one element selected from Mg and Zn; andM=NiCoMnMin which Mis at least one element selected from Fe, Cu, Ti, Zr, V, Ga, and Si; and 0&#x2266;x&#x3c;0.70; 0.10&#x2266;y&#x3c;0.55; 0&#x2266;z&#x3c;0.30; and 0.20&#x3c;(1-x-y-z); b+c+z&#x3e;0; and in that said active material, regardless of its state of charge, satisfies the relationship:0.40&#x3c;R&#x3c;0.90, where:=(1-a-b-c)*[3-[(n/n)/(4-2-3)]*(2--2)]in which: nis the lithium content expressed in moles; nis the sum of the contents of Ni, Mn, Co, and Mexpressed in moles; and dis the overall degree of oxidation of M.

Electrochemically active material for the positive electrode of an electrochemically rechargeable lithium cell

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

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.

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Marcoussis, France

Jean-Pierre Boeuve