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:
Oct. 20, 1998
Filed:
Oct. 23, 1996
Rene Koksbang, Odense, DK;
Valence Technology, Inc., Henderson, NV (US);
Abstract
In a preferred method, a lithium compound is reacted with a manganese compound in the presence of gaseous ammonia produced by the decomposition of an ammonium compound. In the preferred method, the decomposition of the ammonium compound is initiated before the reaction occurs to form the lithium manganese oxide product spinel. It is also possible to have the decomposition initiated at about the same time as the reaction. It is possible to have the decomposition continue while the reaction to form the spinel occurs. The reaction to form the spinel occurs at an elevated temperature to provide a product of the desired nominal general formula, having a quantity of lithium corresponding to more than 1 atomic units of lithium for every 2 atomic units of manganese. This lithium-rich product, having greater than a 1:1 ratio of Mn.sup.+3 to Mn.sup.+4 is made possible by the presence of the ammonia decomposition gas. It is preferred that the lithium compound, the manganese compound, and the ammonium compound each be in particle form and intermingled in a desired proportion prior to heating.