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:
Feb. 06, 2001
Filed:
Oct. 24, 1997
Varta Batterie Aktiengesellschaft, Hannover, DE;
Abstract
Suitable as active cathode material for an electrochemical lithium secondary cell are oxygen-deficient spinels Li,Mn,O,, where 0≦x≦0.33 and 0.01≦&dgr;≦0.5. Their region of existence in a phase diagram laid out between the corner points MnO, MnO,and Li,MnO,for lithium manganese oxide compounds is defined by the corner compounds LiMn,O,, Li,Mn,O,, Li,Mn,O,and Li,Mn,O,, all the compounds along the lines LiMn,O,—Li,Mn,O,and LiMn,O,—Li,Mn,O,being excepted. The spinels are produced by a modified ceramic process from a mixture of Li-containing and Mn-containing starting substances whose reaction product is reduced by roasting in an Ar/H,atmosphere. The Li components x can be replaced partially or completely by foreign monovalent or multivalent cations from the series consisting of Co, Mg, Zn, Ni, Ca, Bi, Ti, V, Rh or Cu.