Positive active material for rechargeable lithium battery and method of preparing same
US6274273A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Sep 22, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is a positive active material for a rechargeable lithium battery having a higher concentration of Co in the surface portion than in the central portion. The surface portion is a region from the outermost surface to a depth of 10 microns. The positive active material is represented Li.sub.1+x Mn.sub.2-y Co.sub.y O.sub.4 wherein -0.1<x0.1 and 0<y<0.1. The positive active material is produced by obtaining a sol or gel cobalt material by mixing lithium salts, cobalt salts, an alcohol and chelating agents and heating the mixture, mixing the sol or gel cobalt material with LiMn.sub.2 O.sub.4, and heat-treating the resulting mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.