Positive active material for rechargeable lithium battery and method of preparing same
US6613476B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 2001 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Jun 24, 2021 |
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 of for a rechargeable lithium battery and a method of preparing the same. The positive active material is represented by formula 1:LixMn2-a-bCraMbO4+z  [formula 1]where x≧2; 0.25<a<2; 0<b≦0.3; z≧0; M is an alkali earth metal, a transition metal or a mixture thereof. The method includes the steps of dissolving a chromium salt, a manganese salt, and a metal salt(s) in a solvent to produce a solution; performing a first heat-treatment step on the obtained solution at 400 to 500° C. to produce a chromium manganese metal oxide; mixing the chromium manganese metal oxide with a lithium salt; and performing a second heat-treatment step at 600 to 800° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.