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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 10727532 B1

PDFFull Text
Date of Patent:
Jul. 28, 2020

Filed:

Dec. 14, 2016

Positive active material for lithium secondary battery, method for producing precursor of positive active material, method for producing positive active material, positive electrode for lithium secondary battery, and lithium secondary battery

Applicant:

Gs Yuasa International Ltd., Kyoto-shi, Kyoto, JP;

Inventors:

Daisuke Endo, Kyoto, JP;

Takashi Shimizu, Kyoto, JP;

Assignee:

GS Yuasa International Ltd., Kyoto, JP;

Attorney:

Rankin, Hill & Clark LLP

Primary Examiner:

Kenneth J Douyette

Int. Cl.
CPC ...
H01M 4/52 (2010.01); H01M 4/50 (2010.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 10/0566 (2010.01); H01M 10/052 (2010.01); C01G 53/00 (2006.01); H01M 10/04 (2006.01); H01M 10/056 (2010.01);
U.S. Cl.
CPC ...
H01M 10/0525 (2013.01); C01G 53/006 (2013.01); C01G 53/50 (2013.01); H01M 4/382 (2013.01); H01M 4/50 (2013.01); H01M 4/505 (2013.01); H01M 4/52 (2013.01); H01M 4/525 (2013.01); H01M 10/0431 (2013.01); H01M 10/052 (2013.01); H01M 10/056 (2013.01); H01M 10/0566 (2013.01); C01P 2002/50 (2013.01); C01P 2002/52 (2013.01); C01P 2002/72 (2013.01); C01P 2002/76 (2013.01); C01P 2002/77 (2013.01); C01P 2002/85 (2013.01); C01P 2004/34 (2013.01); C01P 2006/11 (2013.01);
Abstract

The positive active material for a lithium secondary battery includes a lithium transition metal composite oxide having an α-NaFeOstructure, and having a diffraction peak at 2θ=44±1° and a diffraction peak at 2θ=18.6±1° in a powder X-ray diffraction diagram using a CuKα ray. In a ratio FWHM (003)/FWHM (104) of a full width at half maximum FWHM (003) for the diffraction peak at 2θ=18.6±1° to a full width at half maximum FWHM (104) for the diffraction peak at 2θ=44±1°, a ratio of FWHM (003)/FWHM (104) in a charge state immediately after a discharge state to FWHM (003)/FWHM (104) in the discharge state is 0.72 or more.

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