Patent ID: 7399555
Filing Date: 2008-07-15
Classification: H01M,Y02E,Y02P

Abstract:
1. A non-aqueous electrolyte secondary battery comprising: an electrode plate assembly; a non-aqueous electrolyte; and an outer jacket accommodating said electrode plate assembly and said non-aqueous electrolyte therein, said electrode plate assembly comprising a positive electrode plate, a negative electrode plate and a separator interposed between said positive electrode plate and said negative electrode plate, said separator comprising a multi-porous film having a three-layer polyolefin resin structure, wherein (1) said separator comprises at least a first layer comprising a polypropylene resin and arranged on one outer face of said separator, a second layer comprising a polypropylene resin and arranged on another outer face of said separator, and an intermediate layer comprising a polyethylene resin arranged between the first and second layers; (2) said first and second layers comprising a polypropylene resin contain an antioxidant; wherein the antioxidant has a melting point of at least 60° C. and an oxidation potential lower than +4.5 V with respect to lithium; and (3) said first layer comprising a polypropylene resin and said positive electrode are in contact with one another.