Nanostructure material, method for the preparation thereof
US7744835B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 18, 2005 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Dec 24, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a nanostructured material.The material is a nanostructured carbonaceous material composed of agglomerates of small needles of Li1+αV3O8 and of β-LixV2O5 (0.1≦α≦0.25 and 0.03≦x≦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-V2O5 and a Li precursor into contact in amounts such that the ratio of the [V2O5]/[Li] concentrations is between 1.15 and 1.5 and that the (carbon)/(carbon+V2O5+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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.