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:
May. 28, 2019
Filed:
Mar. 30, 2015
Nec Energy Devices, Ltd., Sagamihara-shi, Kanagawa, JP;
Shin Tanaka, Kanagawa, JP;
NEC ENERGY DEVICES, LTD., Sagamihara-shi, Kanagawa, JP;
Abstract
A graphite-based active material including: a first composite particle including a first graphite core particle and a first non-graphite-based carbon material covering the surface of the first graphite core particle; and a second composite particle including a second graphite core particle and a second non-graphite-based carbon material covering the surface of the second graphite core particle, wherein the mass fraction of the second non-graphite-based carbon material in the second composite particle, mass fraction B, is 5% by mass or more and more than the mass fraction of the first non-graphite-based carbon material in the first composite particle, mass fraction A, and the proportion of the second composite particle to the total of the first composite particle and the second composite particle is 1% by mass or more.