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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 9825281 B1

PDFFull Text
Date of Patent:
Nov. 21, 2017

Filed:

Sep. 27, 2012

Method for producing active material for lithium secondary battery and method of using lithium secondary battery

Applicant:

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

Inventors:

Daisuke Endo, Kyoto, JP;

Miki Yasutomi, Kyoto, JP;

Yoshihiro Katayama, Kyoto, JP;

Toshiyuki Nukuda, Kyoto, JP;

Assignee:

GS YUSA INTERNATIONAL LTD., Kyoto-shi, Kyoto, JP;

Attorney:

Manabu Kanesaka

Primary Examiner:

Miriam Stagg

Assistant Examiner:

Claire L Roe

Int. Cl.
CPC ...
H01M 4/04 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/052 (2010.01); C01G 45/12 (2006.01); C01G 51/00 (2006.01); C01G 53/00 (2006.01); H02J 7/00 (2006.01); H01M 10/44 (2006.01);
U.S. Cl.
CPC ...
H01M 4/0445 (2013.01); C01G 45/1228 (2013.01); C01G 51/42 (2013.01); C01G 51/50 (2013.01); C01G 53/50 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/052 (2013.01); H02J 7/00 (2013.01); C01P 2002/50 (2013.01); C01P 2002/72 (2013.01); C01P 2002/74 (2013.01); C01P 2002/77 (2013.01); C01P 2004/82 (2013.01); C01P 2006/40 (2013.01); H01M 10/446 (2013.01); Y10T 29/49108 (2015.01);
Abstract

A lithium secondary battery is produced by employing a charging method where a positive electrode upon charging has a maximum achieved potential of 4.3 V (vs. Li/Li) or lower. The lithium secondary battery contains an active material including a solid solution of a lithium transition metal composite oxide having an α-NaFeO-type crystal structure. The solid solution has a diffraction peak observed near 20 to 30° in X-ray diffractometry using CuKα radiation for a monoclinic Li[LiMn]O-type before charge-discharge. The lithium secondary battery is charged to reach at least a region with substantially flat fluctuation of potential appearing in a positive electrode potential region exceeding 4.3 V (vs. Li/Li) and 4.8 V (vs. Li/Li) or lower. A dischargeable electric quantity in a potential region of 4.3 V (vs. Li/Li) or lower is 177 mAh/g or higher.

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