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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 9478805 B1

PDFFull Text
Date of Patent:
Oct. 25, 2016

Filed:

Aug. 30, 2013

Carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries and method for producing same

Applicants:

Kureha Corporation, Tokyo, JP;

Kuraray Co., Ltd., Kurashiki-shi, Okayama, JP;

Kuraray Chemical Co., Ltd., Bezin-shi, Okayama, JP;

Inventors:

Yasuhiro Tada, Tokyo, JP;

Yasushi Ebihara, Tokyo, JP;

Mayu Komatsu, Tokyo, JP;

Jiro Masuko, Tokyo, JP;

Hajime Komatsu, Tokyo, JP;

Naohiro Sonobe, Tokyo, JP;

Junichi Arima, Bizen, JP;

Akimi Ogawa, Bizen, JP;

Shinya Tago, Bizen, JP;

Kenichi Koyakumaru, Bizen, JP;

Hideharu Iwasaki, Kurashiki, JP;

Kiyoto Otsuka, Bizen, JP;

Assignees:

KUREHA CORPORATION, Tokyo, JP;

KURARAY CO., LTD., Kurashiki-Shi, JP;

KURARAY CHEMICAL CO., LTD., Bizen-Shi, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Stewart Fraser

Int. Cl.
CPC ...
H01M 4/587 (2010.01); C01B 31/02 (2006.01); H01M 4/133 (2010.01); H01M 4/02 (2006.01);
U.S. Cl.
CPC ...
H01M 4/587 (2013.01); C01B 31/02 (2013.01); H01M 4/133 (2013.01); H01M 2004/027 (2013.01); H01M 2220/20 (2013.01); Y02E 60/122 (2013.01);
Abstract

Provided is a manufacturing method of carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries, wherein the carbonaceous material is obtained from plant-derived char as a source, potassium is sufficiently removed, and an average particle diameter thereof is small; and a carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries. The method for manufacturing a carbonaceous material having an average particle diameter of 3 to 30 μm, for a negative electrode of non-aqueous electrolyte secondary batteries includes the steps of: (1) heating plant-derived char having an average particle diameter of 100 to 10000 μm at 500° C. to 1250° C. under an inert gas atmosphere containing halogen compound to demineralize in a gas-phase, (2) pulverizing a carbon precursor obtained by demineralization in a gas-phase, (3) calcining the pulverized carbon precursor at 1000° C. to 1600° C. under an non-oxidizing gas atmosphere.

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