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:
Jun. 16, 2015
Filed:
Feb. 20, 2009
Ryuichi Nagase, Ibaraki, JP;
Yoshio Kajiya, Ibaraki, JP;
Ryuichi Nagase, Ibaraki, JP;
Yoshio Kajiya, Ibaraki, JP;
JX Nippon Mining & Metals Corporation, Tokyo, JP;
Abstract
Provided is a positive electrode active material for a lithium ion battery positive electrode material made of lithium-containing nickel-manganese-cobalt composite oxide of a layered structure represented with LiaNixMnyCozO(1.0<a<1.3, 0.8<x+y+z<1.1), wherein, in a region with a molar volume Vm that is estimated from a lattice constant calculated from a (018) plane and a (113) plane in a powder X-ray diffraction pattern using CuK alpha rays as a vertical axis and Co ratio n (molar %) in metal components as a horizontal axis, the relationship thereof is within a range of Vm=21.276-0.0117 n as an upper limit and Vm=21.164-0.0122 n as a lower limit, and a half value width of both the (018) plane and the (113) plane is 0.200° or less. As a result of studying and defining the relationship of the cobalt (Co) ratio and the lattice constant, which are considered to influence the crystal structure, obtained was a positive electrode active material having high crystallinity, high capacity and high security. By using this material, it is possible to obtain a positive electrode active material for a lithium ion battery that is able to further ensure the characteristics and safety of the lithium ion battery.