Saft

Saft-societe Des Accumulateurs Fixes Et De Traction

Saft Leclanche

Alcatel

Saft, Sa

Saft Groupe Sa

Societe Anonyme Dite: Saft

Gipelec

Andre Lecerf

Michel Broussely

Philippe Biensan

Claudette Audry

Jean-Paul Peres

Patrick Bernard

Jean-Paul Gabano

Christian Jordy

Jean-Pierre Boeuve

Stephane Senyarich

Sylvie Baudry

Stephane Gillot

Therese Caillaud

Frederic Chouquais

A compound for use as active material of a positive electrode of a lithium-ion cell. This compound has an average discharge voltage above 4.5V in relation to the Li+/Li couple of approximately 4.7V. The compound includes: a) a spinel-type crystalline phase of formula LiNiMnMnMOin which elements Ti and Al, or a mixture of these; 0.8&#x3c;a&#x3c;1.3; 0&#x3c;x&#x2266;0.15; 0&#x3c;y&#x2266;0.15; b) a cubic crystalline phase of formula LiNiO in which 0&#x2266;t&#x2266;1; and c) a rhomboedric crystalline phase of formula LiNiOin which 0&#x2266;z&#x2266;1.

Insertion compound able to be used as cathodic active material of a lithium rechargeable electrochemical cell

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

Active cathode material for a lithium rechargeable cell

The present invention concerns a nickel electrode comprising a nickel-based hydroxide which satisfies at least one of the following criteria:

Nickel electrode for an alkaline storage cell

The present invention consists in a rechargeable cell having an anode made from materials in which lithium can be inserted, a cathode and an electrolyte constituted by a solution of a lithium salt in a non-aqueous solvent. The material of said cathode includes at least one substance which is a yellow-green single-phase oxide of lithium and manganese with an orthorhombic crystal structure with the following lattice parameters: a=0.459.+-.0.004 nm, b=0.577.+-.0.004 nm and c=0.281.+-.0.003 nm and containing lithium ions in a molar ratio Li/Mn such that 0.85.ltoreq.Li/Mn.ltoreq.1.10. After a first charge said substance is discharged in two stages of which the higher is at a mean voltage greater than 3.5 volts relative to the lithium.

Chargeable lithium electrochemical cell and method of manufacting it

A process of making a cathode material for a secondary battery including a lithium anode and application of said material. A process of making a cathode material for a secondary electrochemical battery including a lithium anode, wherein said material corresponds to one of the formulas Li.sub.y Ni.sub.2-y O.sub.2 or LiNi.sub.1-x Co.sub.x O.sub.2, wherein y is a number ranging from 0.84 to 1.22 and x is a number ranging from 0.09 to 0.5, wherein the base is lithium hydroxide, nickel oxide or possibly cobalt oxide, in a powdered form in the desired stoichiometric ratio, and wherein it is heated in air at a temperature ranging from approximately 600.degree. C. to 800.degree. C.

Process of making a cathode material for a secondary battery including a

Positive active material (2) for electrochemical cells, characterized by the fact that it is constituted by an anhydrous borate having the formula Bi.sub.4 B.sub.2 O.sub.9. The invention is applicable to cells using lithium as the negative active material and the electrolyte may be solid or liquid.

Positive active material for electrochemical cells and electrochemical

A positive active material for an electric cell, said material being constituted by anhydrous copper borate whose formula is Cu.sub.3 B.sub.2 O.sub.6. A method of making such an active material. An electric cell whose positive active material (3) is anhydrous copper borate Cu.sub.3 B.sub.2 O.sub.6, whose negative active material (6) is lithium and whose electrolyte is a solution which is liquid at ambient temperature and whose solvent is an aprotic compound.

Positive active material for an electric cell, a method of preparing the

The invention relates to a solid positive active material for electric cells whose negative active material is an alkali metal. In accordance with the invention, said positive material is a compound formed by two oxides, namely, bismuth oxide Bi.sub.2 O.sub.3 and cupric oxide CuO. Application to lithium cells.

Solid positive active material for high specific energy electric cells

The invention relates to a positive active material for an electric cell with a non-aqueous electrolyte. Said active material is constituted by an oxyphosphate whose formula is Cu.sub.n O.sub.p (PO.sub.4).sub.2,n being an integer greater than 3 and lower than or equal to 6 and p being equal to n-3. Application to lithium primary cells.

Positive active material for an electric cell with a non-aqueous

Novel double chromate compositions having the general formula:

Double chromate compositions for use as positive active material in

Double chromate composition for use as a positive active material in

Method for manufacturing pure silver chromate in which a soluble chromate is made to react with a silver salt in a bichromate medium. The bichromate medium stabilizes the pH and makes it possible to operate in a concentrated medium. The pure product obtained may be used more particularly as a positive active substance in an electrochemical generator having a non-aqueous electrolyte, for it enables avoidance of losses in capacity during idle and storage periods of the generator.

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Pace, France

Andre Lecerf