Commissariat a L'energie Atomique

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Centre National De La Recherche Scientifique

Commissariat À L'énergie Atomique Et Aux Énergies Alternatives

Institut Polytechnique De Bordeaux

Frédéric Le Cras

Carole Bourbon

Sylvain Franger

Séverine Jouanneau

Sébastien Martinet

Sami Oukassi

Steve Martin

Raphael Salot

Raphaël Salot

Sébastien Patoux

Didier Bloch

Delphine Guy-Bouyssou

Antoine Nowodzinski

Sylvain Nizou

Mélanie Alias

Hélène Porthault

Johnny Amiran

Sébastien Launois

Carole Pagano

Brigitte Pecquenard

Michaël Roffat

Nelly Martin

Hélène Lignier

Vincent Dubois

The method for producing a stack of films provided with at least one 3D-structured pattern including providing a first mold having a textured front face including a first 3D pattern, depositing a first layer of the stack on the textured front face so as to cover the first 3D pattern by a continuous layer, the first layer having a first face in contact with the front face of the mold, removing the first mold so as to release the first face of the first layer having a second 3D pattern complementary to the first 3D pattern and depositing a second layer of the stack on the first face of the first layer so as to cover the second 3D pattern by a continuous layer.

Method for producing 3D-structured thin films

Process for the preparation of an insertion compound of an alkali metal in which the following successive stages are carried out:

Method for preparing insertion compounds of an alkali metal, active materials containing same, and devices comprising said active materials

The lithium-ion microbattery comprises a positive electrode having a first Liion storage capacity and a first thickness made from a first lithium insertion material, an electrolyte and a negative electrode having a second storage capacity and a second thickness made from a second insertion material. The thicknesses are such that the ratio of the first storage capacity over the second storage capacity is greater than or equal to 10 and lower than or equal to 1000. During the first charging of the micro-battery, the Liions are inserted in the negative electrode and completely saturate the second insertion material. When initial charging is continued, they form a metallic lithium layer between the electrolyte and the lithium-saturated negative electrode by electroplating. During the subsequent charging and discharging cycles, only the metallic lithium layer participates in transfer of lithium ions.

Method of operating a non-balanced lithium-ion microbattery

A non-volatile electrochemical memory cell formed of a stack of thin films comprising at least one first active layer, suited to releasing and accepting, in a reversible manner, at least one ion species, at least one second active layer, suited to releasing and accepting said ion species, in a reversible manner, the active layers being based on materials having different compositions and electrochemical potential profiles.

Non-volatile electrochemical memory device

The present invention relates to a method of chemically modifying a lithium-based oxide comprising at least one transition metal, which comprises, in succession: Use of the modified lithium transition metal oxide as active positive electrode material for a lithium secondary battery.

Method of modifying a lithium-based oxide comprising at least one transition metal, positive electrode comprising this oxide, and lithium secondary 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

A powdery compound selected from the group consisting of LiTiOand its derivatives selected from the group consisting of LiMTiOand LiTiNO(x and y between 0 and 0.2, M and N selected from the group consisting of Na, K, Mg, Nb, Al, Ni , Co, Zr, Cr, Mn, Fe, Cu, Zn, Si and Mo), used as active material of an electrode for a lithium storage battery, consists of unitary particles having a diameter not greater than 1 &#x3bc;m and 10-50% volume agglomerated particles having a diameter not greater than 100 &#x3bc;m wherein the agglomerated particles formed by agglomeration of said unitary particles. The method for producing such a compound preferably consists in grinding the synthesized oxide for a duration comprised between 24 hours and 48 hours in a planetary mill and in then performing thermal treatment at a temperature comprised between 450&#xb0; C. and 600&#xb0; C.

Titanium and dense lithium mixed oxide powder compound, method for producing said compound and compound-containing electrode

Lithium insertion compound having the following formula (I):LiMM1M2M3M4M5B(XOZ)&#x2003;&#x2003;(I) preferably,  Methods for preparing these compounds. Active materials of electrodes, in particular of positive electrodes containing said compounds, and batteries and electrochromic devices using these compounds.

Boron-substituted lithium compounds, active electrode materials, batteries and electrochrome devices

The subject of the present invention is a lithium electrochemical generator comprising two peripheral electrodes&#x2014;one positive and the other negative&#x2014;each comprising an electrically conductive substrate () and an active layer () that includes an active material, at least one bipolar electrode comprising a positive active layer () on a first electrically conductive substrate and a negative active layer () on a second electrically conductive substrate, the said substrates being fixed together and two separators () flanking each bipolar electrode, in which generator the electrically conductive substrates of each bipolar electrode are made of identical or different materials chosen from aluminium and its alloys and the negative active material of the bipolar electrode prevents an aluminium alloy being obtained with the electrically conductive substrates, under the operating conditions of the storage battery.

Lithium electrochemical generator comprising at least a bipolar electrode with conductive aluminium or aluminium alloy substrates

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Notre Dame de l'Osier, France

Frédéric Le Cras