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:
Nov. 25, 1997
Filed:
Jan. 21, 1997
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An organic electrolyte lithium secondary battery wherein lithium is an active material. The battery comprises a negative electrode made of metallic lithium or a lithium alloy and a separator made of a microporous polyolefin separator matrix whose pores are filled with an ionic conductive gel electrolyte. The separator is in the form of a sheet with at least one face contacting the negative electrode having a gel electrolyte layer. The gel electrolyte is formed by ultraviolet irradiation of a solution having a major component being a mixture of an oligomer and a monomer added to an organic electrolyte. Using the separator in an organic electrolyte lithium secondary battery internal short circuiting of the battery due to dendridic lithium growing on a negative electrode during the charging cycle can be prevented and a longer cycle life achieved.