Composite battery separator film and method of making same

Details Composite battery separator film and method of making same Composite battery separator film and method of making same

2011-05-28

2011-12-20

Crepeau, Jonathan (Department: 1725)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer or spacer insulating structure

C429S249000, C429S254000, C264S464000, C264S045100, C264S046100

Reexamination Certificate

active

08080330

ABSTRACT:
A microporous separator film for electrochemical cells and a method of making such films is disclosed. The microporous separator film includes an intimate mixture of an electrically insulating matrix phase and a self-switching voltage activated conductive phase, wherein the voltage activated conductive phase provides a plurality of conductive paths from a first face of the microporous separator film to a second face of the microporous separator film. The method for making the composite microporous separator film includes the steps of forming an intimate mixture of at least an insulating matrix phase and a self-switching voltage activated phase, forming a film from the mixture, and generating pores within the film.

REFERENCES:
patent: 2003/0049538 (2003-03-01), Buerger et al.
patent: 2003/0099877 (2003-05-01), Call et al.
Xiao, L.F.; A composite polymer membrane with reversible overcharge protection mechanism for lithium ion batteries, Electrochemistry Communications, vol. 7, Jun. 2005, p. 589.

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