Centre National De La Recherche Scientifique

Umicore

Rutgers, the State University of New Jersey

Université De Picardie Jules Verne

Saft

Technische Universitat Darmstadt

Gsi Helmholtzzentrum Fur Schwerionenforschung Gmbh

European Aeronautic Defence and Space Company

Le Centre National De La Rocherche Scientifique

Centre National De La Recherche Scientifique-cnrs

Université De Haute-alsace

Universite Toulouse III – Paul Sabatier

Le Centre National De La Recherche Scientifique

Mathieu Morcrette

Christian Masquelier

Calin Wurm

Sylvain Gwizdala

Jean-Marie Tarascon

Pere Roca I Cabarrocas

Pierre-Louis Taberna

Patrice Simon

Albane Audemer

Renaud Bouchet

Patrick Rozier

Christina Trautmann

Jean-Paul Peres

Dominique Larcher

Lionel Beluze

Stephane Gillot

Abdelmaula Aboulaich

Juliette Saint

Pui Lap Jacob Lee

Maria Eugenia Toimil Molares

Michael Dolle

Virginie Viallet

Priscilla Reale

Christine Surcin

Rénald David

Jean-Bernard Leriche

John Gural

Valerie Lucas

Vincent Seznec

Laurence Tortet

François Rabuel

Adrian Beda

Christina Trautman

Jean-Paul Péres

Stéphane Gillot

The present invention relates to the use of a porous polymer etched ion-track membrane as separator for batteries comprising a positive electrode, a negative electrode and a liquid electrolyte comprising at least one salt of a cationic ion in solution in a solvent, and to batteries comprising such a membrane as porous separator.

Porous etched ion-track polymer membrane as a separator for a battery

The invention relates to a process for the preparation of a vanadium-carbon phosphate composite material, a vanadium-carbon phosphate composite material obtained according to the process, and to the uses of the composite material, especially as a precursor for the synthesis of electrochemically-active materials, electrode or active anode material.

Liquid process for preparing a vanadium phosphate-carbon composite material

The present invention relates to a method for preparing a completely solid Li-ion battery having a solid state body wherein the battery is assembled in a single step by stacking at least one layer of a powder mix including a positive electrode active material and a solid electrolyte, at least one intermediate layer of a solid electrolyte and at least one layer of a powder mix including a negative electrode active material and a solid electrolyte, and simultaneous sintering of the three layers at a pressure of at least 20 MPa, under pulsating current. The invention also relates to the Li-ion battery obtained by such a method.

Method for preparing a solid-state battery by sintering under pulsating current

The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700&#xb0; C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO, phase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.

Carbon-coated Li-containing powders and process for production thereof

The subject of the invention is an anode material of the silicon-carbon composite type, for a lithium cell, having a high mass capacity and good cycling stability. This material is obtained by a preparation method comprising the steps consisting of: The invention also proposes a lithium cell containing at least one anode the material of which contains the nanocomposite material produced by this method.

Nanocomposite material for the anode of a lithium cell

The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700&#xb0; C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePOphase, coated with conductive carbon. When this powder is used as active material in a lithium insertion-type electrode, fast charge and discharge rates are obtained at room temperature and an excellent capacity retention is observed.

The invention concerns an electrochromic cell in thin films and aqueous electrolyte, with an emissivity that varies as a function of an applied control voltage. It is formed of the following flexible elements, superimposed and respectively in intimate contact:

Flexible, aqueous, controlled emission electrochemical cell

Methods of manufacture and use of phosphates of transition metals are described as positive electrodes for secondary lithium batteries, including a process for the production of LiMPOwith controlled size and morphology, M being FeCoNiMn, where 0&#x2266;x&#x2266;1, 0&#x2266;y&#x2266;1, 0&#x2266;w&#x2266;1, and x+y+z+w=1. According to an exemplary embodiment, a process is described for the manufacture of LiFePOincluding the steps of providing an equimolar aqueous solution of Li, Feand PO, evaporating water from the solution to produce a solid mixture, decomposing the solid mixture at a temperature of below 500&#xb0; C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800&#xb0; C. in a reducing atmosphere to produce the LiFePOpowder. The obtained powders can have a particle size of less than 1 &#x3bc;m, and can provide superior electrochemical performance when mixed for an appropriate time with an electrically conductive powder.

Process for making lithium transition metal phosphate powder for battery electrode

Methods of manufacture and use of phosphates of transition metals are described as positive electrodes for secondary lithium batteries, including a process for the production of LiMPOwith controlled size and morphology, M being FeCoNiMn, where 0&#x2266;x&#x2266;1,0&#x2266;y&#x2266;1, 0&#x2266;w&#x2266;1, and x+y+z+w=1. According to an exemplary embodiment, a process is described for the manufacture of LiFePOincluding the steps of providing an equimolar aqueous solution of Li, Feand PO, evaporating water from the solution to produce a solid mixture, decomposing the solid mixture at a temperature of below 500&#xb0; C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800&#xb0; C. in a reducing atmosphere to produce the LiFePOpowder. The obtained powders can have a particle size of less than 1 &#x3bc;m, and can provide superior electrochemical performance when mixed for an appropriate time with an electrically conductive powder.

Lithium transition-metal phosphate powder for rechargeable batteries

A structural system for accurately reproducible in situ x-ray studies of operating rechargeable electrochemical battery cell electrode components comprises an hermetically sealed cell component enclosure incorporating an x-ray transmissive window member of beryllium or the like. A research embodiment of the system comprises means for rapidly and consistently interchanging electrode compositions for operative comparison and evaluation, while a laminated cell system embodiment enables accurate testing of electrode components in commercial configurations such as unitary polymeric Li-ion battery cells.

System structure for in situ x-ray study of electrochemical cell component performance

The electrochemical performance of rechargeable lithium battery cells comprising crystalline or amorphous Fe iron phosphate active positive electrode compounds is improved by compound hydration and intimate ball-milled incorporation of electrically conductive carbon.

Hydrated iron phosphate electrode materials for rechargeable lithium battery cell systems

Growing community of inventors

Amiens, France

Mathieu Morcrette