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:
May. 09, 2023
Filed:
Aug. 28, 2018
Hitachi Metals, Ltd., Tokyo, JP;
Tatsuya Toyama, Tokyo, JP;
Shin Takahashi, Tokyo, JP;
Hisato Tokoro, Tokyo, JP;
Genei Nakajima, Tokyo, JP;
Shuichi Takano, Tokyo, JP;
Akira Gunji, Tokyo, JP;
Akihiko Noie, Tokyo, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
The present invention is to provide a cathode active material used for a lithium ion secondary battery which has a large charge-discharge capacity, and excels in charge-discharge cycle properties, output properties and productivity, and, a lithium ion secondary battery using the same. The cathode active material used for a lithium ion secondary battery comprises a lithium-transition metal composite oxide having an α-NaFeOtype crystal structure and represented by the following formula (1); LiNiCoMO, where, in the formula (1), M is at least one metal element other than Li, Ni and Co; and a, b, c, d and a are respectively numbers satisfying −0.04≤a≤0.04, 0.80≤b≤1.0, 0≤c≤0.06, b+c+d=1, and −0.2<α<0.2, and an a-axis lattice constant of the crystal structure is 2.878×10m or more.