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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 11024839 B1

PDFFull Text
Date of Patent:
Jun. 01, 2021

Filed:

Nov. 21, 2017

Transition metal-containing composite hydroxide and production method thereof, and production method of positive electrode active material for nonaqueous electrolyte secondary battery

Applicant:

Sumitomo Metal Mining Co., Ltd., Tokyo, JP;

Inventors:

Takahiro Toma, Ehime, JP;

Hiroko Senba, Ehime, JP;

Taira Aida, Ehime, JP;

Tetsufumi Komukai, Ehime, JP;

Assignee:

SUMITOMO METAL MINING CO., LTD., Tokyo, JP;

Attorney:

Katten Muchin Rosenman LLP

Primary Examiner:

Victoria H Lynch

Int. Cl.
CPC ...
H01M 4/36 (2006.01); C01G 53/00 (2006.01); C01G 53/04 (2006.01); C30B 7/14 (2006.01); C30B 29/22 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01);
U.S. Cl.
CPC ...
H01M 4/364 (2013.01); C01G 53/006 (2013.01); C01G 53/04 (2013.01); C30B 7/14 (2013.01); C30B 29/22 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); H01M 2004/028 (2013.01); H01M 2220/20 (2013.01);
Abstract

A transition metal-containing composite hydroxide comprises secondary particles having: a center portion of fine primary particles; and an outer-shell portion having a high-density layer of plate-shaped primary particles formed outside the center portion, a low-density layer of the fine primary particles formed outside the high-density layer, and an outer-shell layer of the plate-shaped primary particles formed outside the low-density layer. The composite hydroxide is obtained by a method comprising a nucleation step in an oxidizing atmosphere and a particle growth step, the particle growth step comprising: a first stage of maintaining the oxidizing atmosphere; a second stage of switching to and maintaining a non-oxidizing atmosphere; a third stage of switching again to and maintaining the oxidizing atmosphere; and a fourth stage of switching again to and maintaining the non-oxidizing atmosphere.

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