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. 12, 2022
Filed:
Aug. 17, 2018
Nec Corporation, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
Provided is a lithium ion secondary battery having high energy density and excellent cycle characteristics. The present invention relates to a negative electrode for a lithium ion secondary battery comprising: (i) a negative electrode mixture layer comprising a negative electrode active material and a negative electrode binder and (ii) a negative electrode current collector, wherein the negative electrode active material comprises an alloy comprising silicon (Si alloy), the Si alloy is crystalline and has a median diameter (D50 particle size) of 1.2 μm or less, and an amount of the negative electrode binder based on the weight of the negative electrode mixture layer is 12% by weight or more and 50% by weight or less.