Matthieu Zoa Z Dubarry

US Patent:

7842273, Nov 30, 2010

Filed:

Oct 18, 2005

Appl. No.:

11/665920

Inventors:

Dominique Guyomard - Sautron, FR
Joël Gaubicher - Nantes, FR
Marc Deschamps - Quimper, FR
Matthieu Dubarry - Honolulu HI, US
Benoit Morel - Champagne Mouton, FR

Assignee:

Batscap - Ergue-Gaberic
Centre National de la Recherche Scientifique - Paris

International Classification:

C01G 31/00

US Classification:

4235948, 4231795, 423265, 423414

Abstract:

The invention relates to the preparation of an optionally carbonaceous γ-LiVOmaterial. The process consists in preparing a composition formed of carbon and of precursors of Li and of V and in subjecting it to a heat treatment. The composition is prepared by bringing carbon, α-VOand a Li precursor into contact in amounts such that the ratio of the [VO]/[Li] concentrations is between 0. 95 and 1. 05 and the carbon is in excess of at least 25% with respect to the stoichiometry. The heat treatment is carried out in two stages: a first stage at a temperature between 90 C. and 150 C. for a time of 1 to 12 hours and a second stage at a temperature between 420 C. and 500 C. for a time of between 10 min and 1 hour, under a nitrogen or argon atmosphere or under vacuum. Applications: positive electrode active material.

US Patent:

8435484, May 7, 2013

Filed:

Oct 18, 2005

Appl. No.:

11/665932

Inventors:

Dominique Guyomard - Sautron, FR
Joël Gaubicher - Nantes, FR
Marc Deschamps - Quimper, FR
Matthieu Dubarry - Honolulu HI, US
Benoit Morel - Champagne Mouton, FR

Assignee:

BATSCAP - Ergue-Gaberic
Centre National de la Recherche Scientifique - Paris

International Classification:

C01G 31/00

US Classification:

4235948, 4231795

Abstract:

The invention relates to a lithium vanadium oxide which corresponds to the formula LiVO(0. 1≦α≦0. 25). It is composed of agglomerates of small needles having a length l from 400 to 1000 nm, a width w such that 10

US Patent:

20090263724, Oct 22, 2009

Filed:

Oct 18, 2005

Appl. No.:

11/665921

Inventors:

Dominique Guyomard - Sautron, FR
Jeol Gaubicher - Nantes, FR
Marc Deschamps - Quimper, FR
Matthieu Dubarry - Honolulu HI, US
Philippe Moreau - Saint Mars du Desert, FR

International Classification:

H01M 6/18
H01M 10/26
H01M 4/48
B32B 3/00

US Classification:

429305, 429207, 2521821, 428404, 977700

Abstract:

The invention relates to a nanostructured material.The material is a nanostructured carbonaceous material composed of agglomerates of small needles of LiVOand of β-LiVO(0.1 ≦α≦0.25 and 0.03 ≦×≦0.667) surrounded by a noncontinuous layer of spherical carbon particles.It is obtained by a process consisting in preparing a carbonaceous precursor gel by bringing carbon, α-VOand a Li precursor into contact in amounts such that the ratio of the [VO]/[Li] concentrations is between 1.15 and 1.5 and that the (carbon)/(carbon+VO+Li precursor) ratio by weight is from 10 to 15 and in subjecting the gel to a heat treatment comprising a 1st stage at 80 C.-150 C. for 3-12 h and a 2nd stage between 300 C. and 350 C. for 10 min to 1 hour, under an nitrogen or argon atmosphere.Applications: positive electrode active material.