Separator for metal secondary batteries
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United States of America Patent
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Feb 23, 2021
Grant Date -
Sep 28, 2017
app pub date -
Aug 27, 2015
filing date -
Sep 22, 2014
priority date (Note) -
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Abstract
Provided is a separator which can make the electric field on the surface of a negative electrode for a metal secondary battery homogeneous to thereby prevent the formation of dendrites. A porous separator for metal secondary batteries, which has a polymer electrolyte layer formed on the surface layer of at least one main surface of a porous polyimide film. It is preferred that the polymer electrolyte layer is composed of both a polymer electrolyte material which is supported on at least one main surface of the porous polyimide film and a polymer electrolyte material which is supported in voids in a layered region that extends from the main surface.
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