Centre National De La Recherche Scientifique

Umicore

Universitè De Montpellier

Saft Groupe Sa

Saft

Stéphane Levasseur

Christian Masquelier

Philippe Biensan

Christian Jordy

Claude Delmas

Michèle Van Thournout

Georges Caillon

Josette Olivier-Fourcade

Cécile Tessier

Laure Monconduit

Thierry Hezeque

Pierre Gibot

Nina V Kosova

Evgeniya T Devyatkina

Laurence Croguennec

Julien Breger

Claire Villevieille

Costana Ionica-Bousquet

Frédéric Castaing

Jessica Bains

The invention relates to crystalline nanometric olivine-type LiFeMPOpowder with M being Co and/or Mn, and 0&#x2266;x&#x2266;1, with small particle size and narrow particle size distribution. A direct precipitation process is described, comprising the steps of: providing a water-based mixture having at a pH between 6 and 10, containing a dipolar aprotic additive, and Li, Fe, P, and Coand/or Mnas precursor components; heating said water-based mixture to a temperature less than or equal to its boiling point at atmospheric pressure, thereby precipitating crystalline LiFeMPOpowder. An extremely fine particle size is obtained of about 80 nm for Mn and 275 nm for Co, both with a narrow distribution.

[object Object]

An active material for a lithium battery electrode comprises a phase having the formula LiCTiFeMM'O, in which M and M&#x2032; are metal ions of groups oftohaving an ionic radius betweenand&#x212b; in an octahedral environment, v, w, x, y, z and &#x3b1; being associated by the relationships:&#x3b1;=&#x2212;v+w&#x2212;x&#x2212;ny&#x2212;n&#x2032;z, with n and n&#x2032; being the respective formal degrees of oxidation of M and M&#x2032;; &#x2212;&#x2266;v&#x2266;; y+z&#x3e;; x+y+z=w; and&#x3c;w&#x2266;; and wherein at least part of the lithium is substituted by carbon according to the relationship&#x3c;c(+v)/The invention also includes a method for synthesizing the active material which comprises mixing and grinding the precursor compounds containing the metal components, carbon and oxygen; heating the mixture in an inert atmosphere at a temperature ofto&#xb0; C. in order to make a ceramic phase; and rapidly cooling the ceramic phase to produce the active material.

Negative electrode material for Li-ion batteries

The present invention relates to crystalline nanometric olivine-type LiFeMnPOpowder with 0&#x3c;x&#x3c;1, with small particle size and narrow particle size distribution. The fine particle size is believed to account for excellent high-drain properties, while minimizing the need for conductive additives. The narrow distribution facilitates the electrode manufacturing process and ensures a homogeneous current distribution within the battery.

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Brussels, Belgium

Stéphane Levasseur