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:
Dec. 29, 2015
Filed:
Mar. 02, 2011
Kentaro Okamoto, Kitaibaraki, JP;
Yoshio Kajiya, Kitaibaraki, JP;
Kentaro Okamoto, Kitaibaraki, JP;
Yoshio Kajiya, Kitaibaraki, JP;
JX Nippon Mining & Metals Corporation, Tokyo, JP;
Abstract
The present invention provides a positive electrode active material for a lithium ion battery which has high capacity and good rate characteristics. The positive electrode active material has a layer structure represented by the compositional formula: Li(NiMe)O, wherein Me represents at least one type selected from the group consisting of Mn, Co, Al, Mg, Cr, Ti, Fe, Nb, Cu and Zr, x denotes a number from 0.9 to 1.2, y denotes a number from 0.5 to 0.65, and z denotes a number of 1.9 or more. The positive electrode active material is selected by measuring the coordinates of the lattice constant a and compositional ratio (Li/M) and selecting materials within the region enclosed by three lines given by the equations: y=−20.186x+59.079, y=35x−99.393, and y=−32.946x+95.78, wherein the x-axis represents a lattice constant a and the y-axis represents a compositional ratio (Li/M) of Li to M.