Commissariat a L'energie Atomique

Helene Lignier

Frederic Le Cras

Jean-Yves Sanchez

Carole Bourbon

Gilles Gauthier

Jean-Louis Gabelle

Damien Djian

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 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

A separator for a battery in lithium. The separator is a thick membrane, of around 60 to 120 &#x3bc;m in polyvinylidene fluoride copolymer, which has considerable porosity, of around 50 to 90%, with pores of size between 1 and 10 &#x3bc;m. With these characteristics, it is possible to optimize the operation of a battery with an electrode in, e.g., LiTiO, in particular for rapid charges and discharges, in other words in power applications.

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Saint Laurent du Pont, France

Helene Lignier