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:
Feb. 18, 2020
Filed:
Mar. 02, 2018
Applicant:
Sumitomo Chemical Company, Limited, Tokyo, JP;
Inventors:
Assignee:
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01M 2/16 (2006.01); H01M 2/14 (2006.01); H01M 10/0525 (2010.01);
U.S. Cl.
CPC ...
H01M 2/1653 (2013.01); H01M 2/145 (2013.01); H01M 2/1686 (2013.01); H01M 10/0525 (2013.01);
Abstract
The present invention provides a nonaqueous electrolyte secondary battery separator which is excellent in cycle characteristic. The nonaqueous electrolyte secondary battery separator includes a polyolefin porous film in which a difference between (i) a porosity calculated from a continuous image which is formed so as to extend from a surface to an inside of the polyolefin porous film in a thickness direction and in which a void part and a resin part are shown at respective two gray levels and (ii) a porosity calculated from a thickness, a weight per unit area, and a real density of the polyolefin porous film is 4% to 20%.