Active material of positive electrode for non-aqueous electrolyte secondary battery and method for preparing the same and non-aqueous electrolyte secondary battery using the same
US6794036B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2003 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Aug 15, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an active material of a positive electrode for a non-aqueous electrolyte secondary battery where lithium cobaltate represented by the formula LiCoO2 is used, which comprises a mixture of primary particles of small crystals falling in the range of 0.4 to 10 &mgr;m in Feret's diameter in a projection chart by SEM observation and having an average diameter of 5 &mgr;m or less and secondary particles formed by gathering of a number of said small crystals and having an average particle size falling in the range of 4 to 30 &mgr;m where the molar ratio of Co to Li is 0.97 or more to 1.03 or less, at least part of the small crystals constituting the secondary particles are jointed by sintering and furthermore, the secondary particles are preferably spherical or elliptical.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.