The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2002
Filed:
Jul. 10, 2000
Paul A. Christian, Norton, MA (US);
Ou Mao, New Milford, CT (US);
The Gillette Company, Boston, MA (US);
Abstract
The invention relates to an improved method for preparing a lithiated manganese dioxide having a stabilized &ggr;-MnO -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;-MnO -type crystal structure that can be advantageously included in the cathode of a lithium primary electrochemical cell.