Umicore

Centre National De La Recherche Scientifique

Universitè De Montpellier

Saft Groupe Sa

Universite De Montpellier II

Michèle Van Thournout

Christian Masquelier

Stephane Levasseur

Pierre Gibot

Stéphane Levasseur

Randy De Palma

Cécile Tessier

Josette Olivier-Fourcade

Laure Monconduit

Philippe Carlach

Claire Villevieille

Jean-Claude Jumas

Costana Ionica-Bousquet

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]

The invention relates to a LiNiCoMnM'Ocomposite oxide for use as a cathode material in a rechargeable battery, with a non-homogenous Ni/M&#x2032; ratio in the particles, allowing excellent power and safety properties when used as positive electrode material in Li battery. More particularly, in the formula 0.9&#x3c;a&#x3c;1.1, 0.3&#x2266;x&#x2266;0.9, 0&#x3c;y&#x2266;0.4, 0&#x3c;y&#x2032;&#x2266;0.4, 0&#x3c;z&#x2266;0.35, e&#x3c;0.02, 0&#x2266;f&#x2266;0.05 and 0.9&#x3c;(x+y+y&#x2032;+z+f)&#x3c;1.1; M&#x2032; consists of either one or more elements from the group Al, Mg, Ti, Cr, V, Fe, Mn and Ga; N consists of either one or more elements from the group F, Cl, S, Zr, Ba, Y, Ca, B, Sn, Sb, Na and Zn. The powder has a particle size distribution defining a D10, D50 and D90; and the x and z parameters varying with the particles size of the powder, and is characterized in that either one or both of:1&#x2212;2&#x2267;0.005and2&#x2212;1&#x2267;0.005;x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10.

Positive electrode materials combining high safety and high power in a Li rechargeable battery

The invention relates to a LiNiCoMOAcomposite oxide for use as a cathode material in a rechargeable battery, with a non-homogenous Ni/Al ratio in the particles, allowing excellent power and safety properties when used as positive electrode material in Li battery. More particularly, in the formula 0.9&#x3c;a&#x3c;1.1, 0.3&#x2266;x&#x2266;0.9, 0&#x2266;y&#x2266;0.4, 0&#x3c;z&#x2266;0.35, e=0, 0&#x2266;f&#x2266;0.05 and 0.9&#x3c;(x+y+z+f)&#x3c;1.1; M consists of either one or more elements from the group Al, Mg and Ti; A consists of either one or more elements from the group S and C. The powder has a particle size distribution defining a D10, D50 and D90; and said x and z parameters varying with the particles size of said powder, and is characterized in that either one or both of: x1&#x2212;x2&#x2267;0.010 and z2&#x2212;z1&#x2267;0.010; x1 and z1 being the parameters corresponding to particles having a particle size D90; and x2 and z2 being the parameters corresponding to particles having a particle size D10.

Non-homogenous positive electrode materials combining high safety and high power in a Li rechargeable battery

The invention relates to active material for the negative electrode of secondary rechargeable lithium batteries, wherein the active material is based on doped or undoped carbon-bearing lithium titanium ramsdellite oxide with general formula LiTiOor LiTiO. The active material comprises a carbon substituted ramsdellite phase having a general formula LC&#x2014;TiO, with 0.1&#x3c;c&#x3c;0.5, and more than 0.1 mol % of spinel phase having a general formula Li+xTiOwith 0&#x3c;x&#x3c;0.33.

High voltage negative active material for a rechargeable lithium battery

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.

The present invention relates to lithium secondary batteries and more specifically to positive electrode materials operating at potentials greater than 2.8 V vs. Li/Li in non-aqueous electrochemical cells. In particular, the invention relates to crystalline nanometric olivine-type LiFeMPOpowder with M is Co and/or Mn, and 0&#x3c;x&#x3c;1, with small particle size and narrow particle size distribution. A direct precipitation process is described, comprising the steps of:&#x2014;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;&#x2014;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. The fine particle size is believed to accounts 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.

Growing community of inventors

Isières, Belgium

Michèle Van Thournout