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. 14, 2020
Filed:
Oct. 13, 2015
Sumitomo Chemical Company, Limited, Tokyo, JP;
Tanaka Chemical Corporation, Fukui-shi, Fukui, JP;
Kenji Takamori, Fukui, JP;
Hiroyuki Kurita, Tsukuba, JP;
Yuichiro Imanari, Fukui, JP;
Daisuke Yamashita, Fukui, JP;
Kimiyasu Nakao, Fukui, JP;
Kyousuke Doumae, Fukui, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
TANAKA CHEMICAL CORPORATION, Fukui-Shi, Fukui, JP;
Abstract
A positive electrode active material, which has a crystallite size α/crystallite size β ratio (α/β) of 1 to 1.75 or less, wherein the crystallite size α is within a peak region of 2θ=18.7±1° and the crystallite size β is within a peak region of 2θ=44.6±1°, each determined by a powder X-ray diffraction measurement using Cu-Kα ray, and has a composition represented by formula (I) below:Li[Li(NiCoMnM)]O  (I)wherein 0≤x≤0.2, 0.3<a<0.7, 0<b<0.4, 0<c<0.4, 0≤d<0.1, a+b+c+d=1, and M is at least one metal selected from the group consisting of Fe, Cr, Ti, Mg, Al and Zr.