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:
Jan. 28, 2003
Filed:
Mar. 02, 2001
Fazlil Coowar, Didcot, GB;
Accentus plc, Didcot, GB;
Abstract
An oxide LiMnO which has a layered monoclinic structure, and in which a minor part of the manganese may be replaced by another transition metal, is made by a two-stage process. Firstly NaXo with a layered structure of the &agr;-NaFeO -type is made by reacting stoichiometric amounts of a sodium salt and a salt of the metal X in solution so as to form a precipitate, drying and heat treating the precipitate at a temperature between 650 and 720° C. in air, and then rapidly cooling the precipitate to room temperature in air. Then the NaXO is subjected to ion exchange with a lithium salt in solution in a non-alcoholic solvent at a temperature between about 140 and 210° C. The resulting lithium manganese oxide can be used as the cathode material in a rechargeable lithium cell.