Commissariat a L'energie Atomique

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

Centre National De La Recherche Scientifique

Electricite De France - Service National

Institut Polytechnique De Bordeaux

Sadacem, S.a.

Bollore Technologies S.a.

Frederic Le Cras

Carole Bourbon

Didier Bloch

Gilles Gauthier

Helene Lignier

Sami Oukassi

Sébastien Patoux

Djamel Mourzagh

Delphine Guy-Bouyssou

Sylvain Nizou

Johnny Amiran

Brigitte Pecquenard

Carole Pagano

Nelly Martin

Vincent Dubois

Pierre Strobel

Sebastian Patoux

Jean-Louis Gabelle

Dominique Perrin

Severine Si Larbi Jouanneau

A method of preparing an amorphous film of lithiated metal sulfide or oxysulfide of formula LiM(OS)using a lithiated target material:

Method for preparing an amorphous film made from lithiated metal sulfide or oxysulfide

A method for producing lithium-ion batteries comprising the steps of (a) forming, on a substrate, a cathode current collector layer and a stack of a cathode layer made from a material capable of inserting lithium ions, an electrolyte layer and an anode layer, (b) depositing a lithium layer on the anode layer in order to form a lithium alloy, (c) short-circuiting the anode and cathode layers by depositing an anode current collector layer on the anode layer, thereby causing the diffusion of the lithium ions from the anode layer to the cathode layer, and (d) separating the batteries, resulting in the opening of the short-circuit between the anode and cathode layers in all the batteries. The method simplifies and improves the method for producing lithium-ion microbatteries and improves the diffusion of the lithium ions from the anode layer to the cathode layer after short-circuiting these two layers.

Method for producing lithium-ion batteries

A method for determining the self-discharge current of a lithium-ion battery provided with a positive electrode, a negative electrode, and an electrolyte arranged between the positive and negative electrodes includes charging the battery until a metal lithium layer is formed between the electrolyte and the negative electrode, measuring the open-circuit voltage of the battery at two moments, and determining the self-discharge current from the variation of the voltage measured between the two moments.

Method for estimating the self-discharge of a lithium battery

The invention relates to an all-solid-state lithium battery and to a method for producing such a battery. The all-solid-state lithium battery includes first and second electrodes separated by a solid electrolyte. The second electrode is formed by a composite material including an electrochemically-active material made of a lithium-ion insertion material, and an amorphous lithium-based material which is an ionic conductor for the lithium ions and which is inert relative to the electrochemically active material.

All-solid-state lithium battery, and production method therefor

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

A material or compound is provided having a spinel structure and corresponding to the formula LiNiMnMnAO, where:

Optimised positive electrode material for lithium cell batteries, method for the production thereof, electrode, and battery for implementing said method

The LiMPOcompound is synthesized by reacting a compound of general formula XMPO, nHO where X represents a radical selected from &#x2014;NHand &#x2014;H and M is a transition metal selected from Co, Ni and Mn, with a lithium source such as lithium nitrate, at a temperature lower than or equal to 350&#xb0; C. The XMPO, nHO compound further exhibits a particular morphology in the form of platelets that is preserved during the reaction between the two precursors. The LiMPOcompound thus synthesized is advantageously used as active material of an electrode for a lithium storage battery.

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The invention relates to a lithium battery, comprising at least one lithium intercalation compound, made up of crystallites and obtained by a production method, comprising at least the following steps: formation of a homogeneous mixture of at least one precursor for the lithium intercalation compound with a given adjunct, chemically stable with relation to crystallites and designed to limit the growth of crystallites or crystallite precursors during the formation thereof, thermal treatment of the homogeneous mixture for the synthesis of the lithium intercalation compound in the form of crystallites and to give a composite material comprising at least two phases formed respectively by the lithium intercalation compound and the adjunct and forming of the composite material to give said electrode. The invention further relates to an electrode obtained by said method and lithium battery comprising such an electrode.

Electrode for a lithium battery, method for production of such an electrode and lithium battery comprising said electrode

The present invention relates to a process for preparing composite materials comprising an electrode active compound of formula ADMZONF, such as an alkali metal ion, such as a lithium ion, insertion compound, and an electronically conducting compound, such as carbon, in which a homogeneous mixed precursor containing all the elements A, D, M, Z, O, N and F forming the electrode active compound and also one or more organic and/or organometallic compounds are thermally decomposed, in a short period of time, so as to obtain the composite material. These composite materials in particular find their application in devices containing said compounds and/or active materials, such as electrochemical devices and batteries, in particular lithium batteries.

Method for preparing composite materials comprising an electrode active compound and an electronic conductor such as carbon in particular for a lithium battery

The present invention relates to a method for charging a lithium-ion accumulator with a negative electrode at an operating potential larger than 0.5 volts relatively to the Li+/Li pair, which comprises a first charging step at a constant voltage between 2 volts and 5 volts.

Method of charging a lithium-ion battery comprising a negative electrode

A memory device including a stack of layers. At least one first active layer is based on a crystalline ionic and electronic conducting material capable of releasing and/or accepting at least one ionic species. At least one second active layer is based on a crystalline ionic and electronic conducting material capable of releasing and/or accepting the ionic species. The first active layer and the second active layer are based on a material that has a high potential variation for a low variation in the concentration of the ionic species. At least one layer forms an electrolyte between the first active layer and the second active layer, and is based on at least one ionic conducting and electronic insulating material. A measurement instrument is provided for measuring the electrochemical potential difference between the first active layer and the second active layer.

Electrochemical memory device

A lithium storage cell comprises at least a first electrode comprising an active material wherein Lications can be inserted, a second electrode and an electrolyte. The active material of the first electrode comprises a linear condensed compound comprising at least two tetrahedra, respectively of AOand A'Otype, bonded by a common oxygen atom. A transition metal ion Mwith a degree of oxidation of +2 selected from the group consisting of Ni, Co, Mn, Feand Tiis inserted in the linear condensed compound, and the ratio between the number of Lications able to be inserted in the active material and the number of transition metal ions Mis strictly greater than 1. A and A&#x2032; are selected from the group consisting of P, Si, Al, S, Ge, B.

Lithium storage cell presenting both a high electrical potential and a high lithium insertion capacity

The invention relates to the preparation of insertion compounds based on manganese oxide, usable as the positive electrode active material in a lithium battery. These compounds in the hatched area of FIG. 1 can be prepared by reacting in the solid state a manganese oxide powder MnO.sub.2 -.beta., having a specific surface below 7 m.sup.2 /g and an average grain size below 10 .mu.m, with a powder of a lithium compound such as Li.sub.2 CO.sub.3 or LiOH, at a temperature of 150.degree. to 500.degree. C. for an adequate time to convert the .beta.-MnO.sub.2 into manganese and lithium oxide having a lacunary or stoichiometric spinel structure.

Growing community of inventors

Notre Dame de l'Osier, France

Frederic Le Cras