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:
Jul. 14, 2020
Filed:
Sep. 21, 2016
Nec Energy Devices, Ltd., Sagamihara-shi, Kanagawa, JP;
Kouzou Takeda, Kanagawa, JP;
Envision AESC Energy Devices, Ltd., Sagamihara-shi, Kanagawa, JP;
Abstract
A negative electrode for a lithium ion secondary battery including a current collector and a negative electrode active material layer on the current collector, wherein the negative electrode active material layer includes: a first composite particle with a first graphite core particle and a first non-graphite-based carbon material coating a surface thereof; and a second composite particle with a second graphite core particle and a second non-graphite-based carbon material coating a surface thereof, and wherein an average particle diameter of the first composite particles is 5-30 μm; an average particle diameter of the second composite particles is 2-25 μm, and is smaller than the average particle diameter of the first composite particles; the mixing ratio of the first composite particle A and the second composite particle B is 50:50-95:5 in mass ratio; and a density of the negative electrode active material layer is 1.4-1.7 g/cm.