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.:
Date of Patent:
Oct. 16, 2018
Filed:
Dec. 01, 2014
Nippon Carbon Co., Ltd., Chuo-ku, Tokyo, JP;
Ken-ichi Hongawa, Omihachiman, JP;
Kazuaki Yamashita, Otsu, JP;
NIPPON CARBON CO., LTD., Chuo-ku, Tokyo, JP;
Abstract
A negative electrode active material for lithium ion capacitor, which reduces the thickness of a negative-electrode active material layer while maintaining the conventional level of energy density. The negative-electrode active material is a composite carbon material manufactured by kneading a carbon black having an average particle diameter of 12 to 300 nm with a carbon precursor such as pitch, the resulting mixture is baked or graphitized baking between 800° C. to 3200° C., and then pulverized such that the average particle diameter (D) thereof is 1 to 20 μm and the BET specific surface area is between 100-350 m/g. An initial charging capacity is at least 700 mAh/g, and the cell volume is reduced as the thickness of the negative electrode active material layer becomes thinner than the conventional one.