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:
Apr. 21, 2020
Filed:
Dec. 05, 2016
Gs Yuasa International Ltd., Kyoto-shi, Kyoto, JP;
Takeshi Saski, Kyoto, JP;
Tomonori Kako, Kyoto, JP;
Shota Ito, Kyoto, JP;
Ryosuke Shimokawa, Kyoto, JP;
GS Yuasa International Ltd., Kyoto, JP;
Abstract
An energy storage device having sufficient energy density and sufficient power is provided. In this embodiment, an energy storage device that includes a negative electrode containing an active material layer including an active material is provided. The active material layer includes particulate graphite as the active material. A particle diameter frequency distribution of the graphite includes a first peak and a second peak which appears in a region where a particle diameter is larger than a particle diameter of the first peak, the particle diameter of the first peak is equal to or less than 10 μm and the particle diameter of the second peak is more than 10 μm. The active material layer further includes a particulate high hardness active material which has higher hardness than the graphite.