Mechanochemical synthesis of lithiated manganese dioxide
US6403257B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Nov 11, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01M2004/021
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to an improved method for preparing a lithiated manganese dioxide having a stabilized &ggr;-MnO2-type crystal structure whereby an essentially dry mixture of manganese dioxide and a lithium salt is subjected to a mechanical activation process in the presence of milling media. The mechanical activation process serves to promote partial ion-exchange of protons present in the manganese dioxide crystal lattice and on the surface of the manganese dioxide particles by lithium cations. The formed lithium ion-exchanged intermediate product is heat-treated to form a lithiated manganese dioxide product having a &ggr;-MnO2-type crystal structure that can be advantageously included in the cathode of a lithium primary electrochemical cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.