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:
Sep. 01, 2026
Filed:
Aug. 30, 2023
Kabushiki Kaisha Toshiba, Tokyo, JP;
Yasuyuki Hotta, Tokyo, JP;
Keigo Hoshina, Yokohama Kanagawa, JP;
KABUSHIKI KAISHA TOSHIBA, Kawasaki, JP;
Abstract
According to one embodiment, a secondary battery provided with a negative electrode including a negative electrode active material-containing layer, a positive electrode including a positive electrode active material-containing layer, a separator located between the negative electrode and the positive electrode, and an aqueous electrolyte is provided. The separator includes a composite layer containing inorganic solid particles and a polymeric material. A particle size distribution of the inorganic solid particles in the composite layer has at least two peaks. A frequency FPof a peak top Pof a peak on a smallest particle diameter side and a frequency FPof a peak top Pof a peak on a largest particle diameter side in the particle size distribution have a relationship of 0.9≤FP/FP≤5. A porosity of the composite layer is less than both of a porosity of the negative electrode active material-containing layer and a porosity of the positive electrode active material-containing layer, and is 1% or more and less than 15%.