Nanostructured Li4Ti5O12 powders and method of making the same
US6827921B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Jul 21, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ultrafine powders of Li4Ti5O12 with particles in the size range of 25-500 nm. The average size of particles is about 500 nm of less, preferably about 300 nm or less. The particles are composed of nanocrystallites, which have an average size about 30 nm. This invention also includes the method of producing these ultrafine Li4Ti5O12 particles. The process utilizes (i) nanoparticles of TiO2, (ii) a lithium salt, and (iii) an organic solvent with a boiling point in the range of 70-230° C. The process is carried out at pressures in the range of 0.5 to 10 atmospheres. The inorganic salt of Li is mixed with TiO2 nanoparticles (˜20-25 nm) in the organic solvent. The solution is heated to a temperature and at a pressure to facilitate the diffusion of Li ions in to nanoparticles. After completion of the reaction, the powder is heat treated in O2 or an inert gas to form the desired phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.