Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Centre National De La Recherche Scientifique

Prayon

Renault S.a.s.

Sébastien Patoux

Carole Bourbon

Sébastien Martinet

Alain M Gourgue

Isabelle Willems

Fannie Alloin

Marianne Chami

Lise Daniel

Alain Germeau

Sébastien Launois

Frederic Le Cras

Frédéric Le Cras

Yvan Reynier

Celine Barchasz

Céline Barchasz

Séverine Jouanneau

Patrick Rozier

Carole Pagano

Mickael Dolle

Grégory Si Larbi

Lucas Sannier

Erwan Dumont-Botto

Yves-Gregoire Assouan

Loïc Simonin

Patrick Rosier

Alain Gourgue

Yves-Grégoire Assouan

A method for preparing a mixture of a powder of an electrode active compound and of a powder of an electron conducting compound is disclosed. According to some aspects, the method includes preparing a liquid medium containing the powder of the electrode active compound and the powder of the electron conducting compound, subjecting the liquid medium containing the powder of the electrode active compound and the powder of the electron conducting compound to the action of high energy ultrasonic waves, removing the liquid medium, and collecting the mixture of the powder of the electrode active compound and of the powder of the electron conducting compound. According to some aspects, an electrode including the mixture as an electrochemically active material, a cell including the electrode, and an accumulator or battery including one or more of these cells are disclosed.

Method for preparing a mixture of an electrode active compound powder and an electronic conductor compound powder, resulting mixture, electrode, cell and battery

The invention relates to a lithium/sulphur accumulator including at least one unit cell including: a negative electrode; an electrode separator comprising a material soaked with electrolyte, said material comprising at least one nonwoven and having a porosity in the range from 50 to 96%, and a thickness in the range from 50 to 200 micrometers; a positive electrode; and wherein said electrolyte is introduced by an excess quantity, and comprises at least one lithium salt, and the excess quantity of electrolyte amounting to from 20 to 200% of the quantity of electrolyte ensuring the wetting of the electrodes and of the separator.

Lithium/sulphur accumulator

The invention relates to lithium-bearing iron phosphate in the form of micrometric mixed aggregates of nanometric particles, to an electrode and cell resulting therefrom and to the method for manufacturing same, which is characterized by a nanomilling step.

Lithium batteries containing lithium-bearing iron phosphate and carbon

A film made of a fluorinated polymer of the polyvinylidene fluoride type having suitable properties for use as a lithium storage battery separator is produced using a phase inversion technique in which a solution containing the fluorinated polymer is brought into the presence of an atmosphere laden with water vapor to precipitate the fluorinated polymer. The fluorinated polymer can be precipitated by placing the support on which the solution is deposited, in which the fluorinated polymer has been previously dissolved, in an enclosure containing an atmosphere laden with water vapor and thermostatically regulated to a temperature comprised between 30&#xb0; C. and 70&#xb0; C. The relative humidity content during precipitation of the fluorinated polymer is advantageously between about 60% and about 98%.

Method of forming a film made of a fluoropolymer of the polyvinylidene fluoride type that can be used as a separator for a lithium battery

A method for producing a composite sulphur/carbon conductive material obtained solely from an initial sulphur and an initial carbon which includes the following successive steps between 50% and 90% by weight of initial sulphur and between 50% and 10% by weight of initial carbon having a specific surface smaller than or equal to 200 m/g are placed in a reactor at atmospheric pressure, the sum of the proportions respectively of the initial sulphur and carbon attaining 100%, the reactor is hermetically sealed at atmospheric pressure, and the composite sulphur/carbon conductive material is formed, in powder form, by heat treatment by heating said reactor to a heating temperature comprised between 115&#xb0; C. and 400&#xb0; C., without external regulation of the pressure inside the reactor, and keeping said reactor at said heating temperature during a predetermined time.

Composite sulphur/carbon conductive material, use as an electrode and method for producing such a material

The invention relates to a material comprising carbon nanotubes, deposited at the surface of each of which is a substantially continuous film of nanoscale silicon particles, that can be used in negative electrodes for a lithium battery.

Material based on carbon and silicon nanotubes that can be used in negative electrodes for lithium batteries

The invention relates to a positive electrode/electrolyte pair for lithium batteries operating at a voltage above 4.2 V versus Li+/Li. The electrolyte of the lithium battery used in the invention includes at least a first additive chosen from optionally substituted, cyclic or acyclic, carboxylic or dicarboxylic anhydrides and carboxylic or dicarboxylic acids, and mixtures thereof, and optionally a second additive which is a lithium salt, the total content of additive(s) being greater than or equal to 0.01% by weight and less than or equal to 30% by weight, relative to the total weight of electrolyte, and the positive electrode is made of a material having a spinel structure. The lithium batteries of the invention are applicable in particular in the field of portable equipment, such as telephones, computers, camcorders, cameras and tooling.

Non-aqueous electrolyte for a high-voltage lithium battery

A method of synthesis of a metal fluorophosphate having the following general formula (1): XM(PO)F(1), in which: X is an alkaline metal selected among sodium (Na) and lithium (Li) or a mixture of said metals; M is a transition metal selected among the following elements: Co, Ni, Fe, Mn, V, Cu, Ti, Al, Cr, Mo, Nb or a combination of at least two of said metals, 0&#x2266;a&#x2266;5; 0.5&#x2266;b&#x2266;3; 0.5&#x2266;c&#x2266;3; and d is an integer equal to 1, 2 or 3. The method contains an electric-field-activated sintering process for a mixture (1) formed by at least one first phosphate-containing solid precursor and at least one second fluorine-containing solid precursor.

Metal fluorophosphate synthesis and use as an active material for a battery electrode

A lamellar-type oxide, in particular used as active material of a positive electrode for a lithium battery and to a method for synthesizing such an oxide. The oxides are used as active materials for the positive electrode of a lithium battery. With such oxides, the specific capacity of a lithium battery is improved and stabilized on cycling.

Positive electrode material formed by a lamellar-type oxide for a lithium battery

A spinel structure compound of the formula LiNiMnO, wherein &#x3b4;&#x3e;0, has a lattice parameter of from 8.179 to 8.183 &#x212b;. The compound may be prepared by mixing carbonated precursors under stoichiometric conditions to produce a mixture, subjecting the mixture to a first heat treatment at a temperature of from 500 to 700&#xb0; C., and then subjecting the mixture to one or more annealing treatments at a temperature of from 700 to 950&#xb0; C., followed by cooling in a medium containing oxygen. The spinel structure compound may be used as an electrochemically active material in an electrode, for example an electrode of a battery.

High-voltage positive electrode material having a spinel structure based on nickel and manganese for lithium cell batteries

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Fontaine, France

Sébastien Patoux