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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 9692057 B1

PDFFull Text
Date of Patent:
Jun. 27, 2017

Filed:

Mar. 09, 2016

Copper-covered steel foil, negative electrode, and battery

Applicant:

Nisshin Steel Co., Ltd., Tokyo, JP;

Inventors:

Sho Majima, Osaka, JP;

Takao Tsujimura, Osaka, JP;

Takeshi Shimizu, Osaka, JP;

Yoshikazu Morita, Osaka, JP;

Takahiro Fujii, Osaka, JP;

Norihiro Kon, Yamagata, JP;

Yoshie Yoshida, Yamagata, JP;

Assignee:

NISSHIN STEEL CO., LTD., Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Scott J Chmielecki

Int. Cl.
CPC ...
H01M 4/66 (2006.01); H01M 4/04 (2006.01); B23K 20/04 (2006.01); B23K 20/227 (2006.01); C25D 7/06 (2006.01); H01M 4/133 (2010.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/50 (2006.01); C22C 38/60 (2006.01); C25D 3/38 (2006.01); C25D 5/10 (2006.01); C25D 5/12 (2006.01); B32B 15/01 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); B23K 101/16 (2006.01); B23K 101/34 (2006.01); B23K 101/38 (2006.01); B23K 103/22 (2006.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01);
U.S. Cl.
CPC ...
H01M 4/661 (2013.01); B23K 20/04 (2013.01); B23K 20/227 (2013.01); B32B 15/015 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/60 (2013.01); C25D 3/38 (2013.01); C25D 5/10 (2013.01); C25D 5/12 (2013.01); C25D 7/0614 (2013.01); H01M 4/0404 (2013.01); H01M 4/133 (2013.01); H01M 4/587 (2013.01); H01M 4/662 (2013.01); H01M 4/667 (2013.01); H01M 10/0525 (2013.01); B23K 2201/16 (2013.01); B23K 2201/34 (2013.01); B23K 2201/38 (2013.01); B23K 2203/22 (2013.01); H01M 10/052 (2013.01); H01M 2004/027 (2013.01); H01M 2220/30 (2013.01); Y02E 60/122 (2013.01); Y02P 70/54 (2015.11); Y02T 10/7011 (2013.01);
Abstract

A negative electrode collector using a copper-covered steel foil for carrying a negative electrode active material for lithium ion secondary batteries has a steel sheet as the core material thereof and has, on both surfaces thereof, a copper covering layer having a mean thickness tof from 0.02 to 5.0 μm on each surface, and of which the total mean thickness, t, including the copper covering layeris from 3 to 100 μm with t/t of at most 0.3. The steel sheet can be common steel, austenitic stainless steel, or ferritic stainless steel. The copper covering layer can be a copper electroplating layer (including one rolled after plating). On the surface of the copper covering layer, for example, a carbon-based active material layer that has been densified through strong roll pressing is formed, and the copper-covered steel foil and the carbon-based active material layer constitute the negative electrode collector.

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