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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 8951436 B1

PDFFull Text
Date of Patent:
Feb. 10, 2015

Filed:

Mar. 31, 2011

Positive electrode active material

Applicants:

Yuji Hashiba, Narita, JP;

Kei Yoshimura, Inzai, JP;

Shinichi Tachizono, Narita, JP;

Takashi Naito, Funabashi, JP;

Takuya Aoyagi, Hitachi, JP;

Tadashi Fujieda, Mito, JP;

Inventors:

Yuji Hashiba, Narita, JP;

Kei Yoshimura, Inzai, JP;

Shinichi Tachizono, Narita, JP;

Takashi Naito, Funabashi, JP;

Takuya Aoyagi, Hitachi, JP;

Tadashi Fujieda, Mito, JP;

Assignee:

Hitachi, Ltd., Tokyo, JP;

Attorney:

Antonelli, Terry, Stout & Kraus, LLP.

Primary Examiner:

Mark Kopec

Assistant Examiner:

William Young

Int. Cl.
CPC ...
H01M 4/88 (2006.01); H01B 1/08 (2006.01); H01M 4/36 (2006.01); B82Y 30/00 (2011.01); C01G 45/12 (2006.01); C01G 51/00 (2006.01); C01G 53/00 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01); C01G 31/02 (2006.01); C01G 49/00 (2006.01); H01M 4/62 (2006.01); C01G 31/00 (2006.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01); H01M 4/587 (2010.01);
U.S. Cl.
CPC ...
H01M 4/364 (2013.01); B82Y 30/00 (2013.01); C01G 45/1228 (2013.01); C01G 51/00 (2013.01); C01G 53/00 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/5825 (2013.01); C01G 31/02 (2013.01); C01G 49/009 (2013.01); H01M 4/625 (2013.01); C01G 31/00 (2013.01); C01P 2004/03 (2013.01); C01P 2004/45 (2013.01); C01P 2004/64 (2013.01); C01P 2006/40 (2013.01); C01P 2006/80 (2013.01); H01M 10/052 (2013.01); H01M 2004/021 (2013.01); Y02E 60/122 (2013.01); Y02T 10/7011 (2013.01); H01M 4/587 (2013.01); C01P 2002/02 (2013.01); C01P 2002/60 (2013.01); C01P 2002/77 (2013.01); C01P 2002/85 (2013.01); C01P 2004/80 (2013.01);
Abstract

A lithium ion secondary battery has a high cycle retention rate, and has its battery capacity increased. A positive electrode active material is used which includes a crystal phase having a structure formed by collecting a plurality of crystallites, and powder particles containing amorphous phases and formed between the crystallites. The amorphous phases and contain one or more kinds of metal oxides selected from the group consisting of vanadium oxide, iron oxide, manganese oxide, nickel oxide and cobalt oxide. The crystal phase and the amorphous phase and are capable of intercalation and deintercalation of lithium ions.

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