Lithium manganese composite oxide for lithium secondary battery cathode active material, manufacturing method thereof, and lithium secondary battery using the composite oxide as cathode active material
US6306542A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | May 21, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
One of the most important subject of the present invention is to provide a new lithium manganese composite oxide which does not include the cobalt which is few as the resource and expensive. For the above purpose, a lithium manganese composite oxide for a lithium secondary battery cathode active material represented by a composition formula of Li.sub.1-x A.sub.x MnO.sub.2 (A is an alkali metal except for Li:0<x<1) and having a layered structure with a rock salt type ordered cations is adopted. According to the lithium manganese composite oxide, the crystal structure is stabilized since the lithium site of the layered structure LiMnO.sub.2 is replaced by the atom of alkali metal element having larger ionic diameter than the lithium ion. Accordingly, not only large discharge capacity is maintained but the cycle characteristic is excellent. In addition, since the lithium manganese composite oxide does not include the cobalt, it can be manufactured in low cost. The present invention can also provide a simple and cheap manufacturing method of the above lithium manganese composite oxide, and a cheap lithium secondary battery which uses the above lithium manganese composite oxide as the c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.