SEPARATOR, AND NONAQUEOUS ELECTROLYTE BATTERY

摘要

PROBLEM TO BE SOLVED: To obtain a separator which is superior in impregnation characteristics and liquid retainability of an electrolytic solution, and does not inhibit ion conductivity.

SOLUTION: The separator is composed of a functional resin layer which contains a resin material and an inorganic oxide filler, and has a porous interconnecting structure of interconnecting numerous holes, and in which a contact angle between the electrolytic solution is 11° or less. The center particle diameter of the inorganic oxide filler is preferably 50% or less of the thickness of the functional resin layer. When the center particle diameter of the inorganic oxide filler is 0.2 μm or more and 5.0 μm or less, specific surface area is 2.0 m2/g or more, and moreover, when the center particle diameter of the inorganic oxide filler is denoted by X [μm], the specific surface area is denoted by Y [m2/g], a multiplied value of X and Y is preferably within a range of 1≤X×Y≤18. Moreover, the functional resin layer preferably contains at least a heat-resistant resin, and more preferably at least a fluororesin.

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