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:
Nov. 06, 2012
Filed:
Aug. 04, 2008
Jens Martin Paulsen, Cheonan, KR;
Thomas Lau, Edmonton, CA;
Jens Martin Paulsen, Cheonan, KR;
Thomas Lau, Edmonton, CA;
Umicore, Brussels, BE;
Abstract
The invention covers a powderous lithium transition metal oxide having a layered crystal structure LiMOM'Sm with −0.03<a<0.06, b≅0, M being a transition metal compound, consisting of at least 95% of either one or more elements of the group Ni, Mn, Co and Ti; M′ being present on the surface of the powderous oxide, and consisting of either one or more elements from (IUPAC) of the Periodic Table, each of said Group 2, 3, or 4 elements having an ionic radius between 0.7 and 1.2 Angstrom, M′ however not comprising Ti, with 0.015<k<0.15, k being expressed in wt %, and 0.15<m≦0.6, m being expressed in mol %. The addition M′ (like Y, Sr, Ca, Zr, . . . ) improves the performance as cathode in rechargeable lithium batteries. In a preferred embodiment a content of 250-400 ppm calcium and 0.2-0.6 mol % of sulfur is used. Particularly, a significantly lower content of soluble base and a dramatically reduced content of fine particles are achieved. Especially preferred performance is achieved if 11.5-13.5% of the metal atoms of the cathodes are divalent nickel.