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:
Oct. 21, 2025
Filed:
Dec. 13, 2022
Murata Manufacturing Co., Ltd., Kyoto, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The negative electrode includes a film covering a negative electrode active material layer. The electrolytic solution includes a chain carboxylic acid ester. According to an analysis of the film by inductively coupled plasma optical emission spectroscopy, a content of boron in the film is greater than or equal to 10 μmol/mand less than or equal to 30 μmol/m, a content of sulfur in the film is greater than or equal to 20 μmol/mand less than or equal to 70 μmol/m, and a ratio of the content of sulfur to the content of boron is greater than or equal to 1.0 and less than or equal to 3.0.