Porous film, secondary battery electrodes, and lithium ion secondary battery

摘要

In regards with the porous film provided on the surface of the electrode used for the secondary battery or so, the present invention provides the porous film which can contribute to reduce the adhered material to the roll during the roll winding of the electrode. The secondary battery electrode formed by adhering; the porous film comprising the inorganic filler and the binder, and styrene and the polymer having the glass transition temperature of 15° C. or less as said binder, the porous film slurry comprising the inorganic filler, the polymer having the glass transition temperature of 15° C. or less and the solvent, and the electrode composite layer comprising the binder and the electrode active material, to the current collector, and said porous film is provided on the surface of the electrode composite layer.

主权项

1. A porous film comprising an inorganic filler, and a binder; wherein the porous film comprises a styrene resin having a glass transition temperature of 40° C. or higher, a polymer having a glass transition temperature of 15° C. or less as said binder, and a content of the styrene resin in said binder is 5 wt % or more and 70 wt % or less.