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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.:

US 10388944 B1

PDFFull Text
Date of Patent:
Aug. 20, 2019

Filed:

Sep. 29, 2015

Positive electrode active material for lithium ion secondary battery, and positive electrode for lithium ion secondary battery and lithium ion secondary battery comprising the same

Applicant:

Hitachi Metals, Ltd., Tokyo, JP;

Inventors:

Tatsuya Toyama, Tokyo, JP;

Shin Takahashi, Tokyo, JP;

Akira Gunji, Tokyo, JP;

Xiaoliang Feng, Tokyo, JP;

Hisato Tokoro, Tokyo, JP;

Takashi Nakabayashi, Tokyo, JP;

Shuichi Takano, Tokyo, JP;

Sho Furutsuki, Tokyo, JP;

Assignee:

HITACHI METALS, LTD., Tokyo, JP;

Attorney:

Volpe and Koenig, P.C.

Primary Examiner:

Basia A Ridley

Assistant Examiner:

Heng M Chan

Int. Cl.
CPC ...
H01M 4/131 (2010.01); H01M 10/0525 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/485 (2010.01); H01M 4/38 (2006.01); H01M 4/48 (2010.01);
U.S. Cl.
CPC ...
H01M 4/131 (2013.01); H01M 4/364 (2013.01); H01M 4/382 (2013.01); H01M 4/483 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01);
Abstract

A positive electrode active material includes a primary particle represented by Compositional Formula (1):NiCoMO  (1),where x is a number satisfying a relation represented by an expression −0.12≤x≤0.2; y is a number satisfying a relation represented by an expression 0.7≤y≤0.9; z is a number satisfying a relation represented by an expression 0.05≤z≤0.3; and M is at least one element selected from the group consisting of Mg, Al, Ti, Mn, Zr, Mo, and Nb; or a secondary particle into which the primary particle aggregates. The primary particle or the secondary particle includes a free lithium compound in a weight proportion of 0.1% or more and 2.0% or less, and the weight of lithium hydroxide in the free lithium compound is 60% or less of the weight of lithium carbonate in the free lithium compound.

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