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. 07, 2015
Filed:
Apr. 22, 2011
Akihiro Suzuki, Yamanashi, JP;
Takehiro Toyooka, Tokyo, JP;
Akira Matsuo, Tokyo, JP;
Takeshi Nishizawa, Tokyo, JP;
Atsuo Omaru, Tokyo, JP;
Akihiro Suzuki, Yamanashi, JP;
Takehiro Toyooka, Tokyo, JP;
Akira Matsuo, Tokyo, JP;
Takeshi Nishizawa, Tokyo, JP;
Atsuo Omaru, Tokyo, JP;
University of Yamanashi, Yamanashi, JP;
JX Nippon Oil & Energy Corporation, Tokyo, JP;
Abstract
Disclosed is a highly safe battery separator, in particular a separator for a lithium ion secondary battery, which reduces internal resistance, achieves good ionic conductivity, prevents passing of electrode active materials, and also prevents electrical short circuit by controlling deposition of lithium metal (dendrite). Also disclosed is a means for stably producing the battery separator with high productivity. Specifically disclosed are: a battery separator which is composed of a porous polyolefin sheet that is formed from a group of polyolefin nanofilaments that have an average filament diameter of less than 1 μm and a filament size distribution of 0.2 or less; and a means for producing the battery separator.