Oblon, McClelland, Maier & Neustadt, L.L.P.
Multilayer porous film, separator for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery
Provided is a multilayer porous film that has extremely high powder fall-off resistance and superior electrolyte solution adsorptivity and heat resistance and exhibits superior properties when used as a battery separator without decreasing the high air permeability of a porous film. The multilayer porous film includes a polyolefin-based resin porous film and a coating layer containing a filler and a resin binder on at least one surface of the polyolefin-based resin porous film. The amount of particles with particle sizes of less than 0.2 μm (D0.2) in the filler is 1% or more, and the specific surface area of the filler is 5 m2/g or more and less than 10 m2/g. The multilayer porous film satisfies a particular condition.
MITSUBISHI PLASTICS, INC.
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H01M H01M H01M H01M H01M B32B H01M H01M H01M H01M H01M B32B H01M B32B Y02E Y10T H01M H01M H01M
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Tomoyuki Hiroto
Nemoto Yamada