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:
Jan. 19, 2021
Filed:
Aug. 27, 2018
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Kazuhisa Takeda, Toyota, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
A technique of preventing the formation of dendritic Li metal on a negative electrode active material surface and suppressing a reduction in cell capacity. In the negative electrode for a lithium ion secondary cell, a negative electrode mixture layer including a negative electrode active material is formed on a foil-shaped negative electrode current collector surface, ion exchange particles that adsorb transition metal ions and release prescribed cations are included in the negative electrode mixture layer, and gold and/or platinum is present in the ion exchange particles. As a result, a large number of metal nanoparticles derived from cations of Au (or Pt) released from the ion exchange particles attach to the negative electrode active material. Since layered Li metal can be easily formed using such metal nanoparticles as metal nuclei, formation of dendritic Li metal is prevented and a reduction in cell capacity can be suppressed.