Method for synthesis of carbon-coated redox materials with controlled size
US7601318B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 21, 2001 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Apr 9, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for the synthesis of compounds of the formula C—LixM1−yM′y(XO4)n, where C represents carbon cross-linked with the compound LixM1−yM′y(XO4)n, in which x, y and n are numbers such as 0≦x≦2, 0≦y≦0.6, and 1≦n≦1.5, M is a transition metal or a mixture of transition metals from the first period of the periodic table, M′ is an element with fixed valency selected among Mg2+, Ca2+, Al3+, Zn2+ or a combination of these same elements and X is chosen among S, P and Si, by bringing into equilibrium, in the required proportions, the mixture of precursors, with a gaseous atmosphere, the synthesis taking place by reaction and bringing into equilibrium, in the required proportions, the mixture of the precursors, the procedure comprising at least one pyrolysis step of the carbon source compound in such a way as to obtain a compound in which the electronic conductivity measured on a sample of powder compressed at a pressure of 3750 Kg·cm−2 is greater than 10−8 S·cm−1. The materials obtained have excellent electrical conductivity, as well a very improved chemical activity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.