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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 9735428 B1

PDFFull Text
Date of Patent:
Aug. 15, 2017

Filed:

Jun. 28, 2013

Negative electrode material for lithium ion secondary batteries, negative electrode for lithium ion secondary batteries, lithium ion secondary battery, method for producing negative electrode material for lithium ion secondary batteries, and method for producing negative electrode for lithium ion secondary batteries

Applicant:

Hitachi, Ltd., Tokyo, JP;

Inventors:

Akihide Tanaka, Tokyo, JP;

Etsuko Nishimura, Tokyo, JP;

Kento Hoshi, Tokyo, JP;

Assignee:

HITACHI, LTD., Tokyo, JP;

Attorney:

Volpe and Koenig, P.C.

Primary Examiner:

Austin Murata

Int. Cl.
CPC ...
B05D 5/12 (2006.01); H01M 4/587 (2010.01); H01M 4/133 (2010.01); H01M 4/1393 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01);
U.S. Cl.
CPC ...
H01M 4/587 (2013.01); H01M 4/0404 (2013.01); H01M 4/0416 (2013.01); H01M 4/0471 (2013.01); H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 4/364 (2013.01); H01M 4/62 (2013.01); H01M 4/622 (2013.01); H01M 10/052 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01);
Abstract

Provided is a negative electrode material for a lithium ion secondary battery, which has excellent high-temperature storage characteristics and cycle characteristics. The negative electrode material for a lithium ion secondary battery has a high molecular weight polymer adsorbed on a carbon material, the O/C value of surface functional group quantity is 4.5% or more and 25% or less in the negative electrode material for a lithium ion secondary battery, and the S/C value of surface functional group quantity is 0.05% or more and 2.5% or less in the negative electrode material for a lithium ion secondary battery. Also provided are a negative electrode for a lithium ion secondary battery, lithium ion secondary battery, and methods for producing the negative electrode material, the negative electrode, and the battery.

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