Asahi Kasei E-materials Corporation

Asahi Kasei Kabushiki Kaisha

Takashi Shuto

Hiroshi Miyazawa

Keitaro Ameyama

An object is to provide a separator excellent in adhesiveness to electrodes and a separator for an electricity storage device also excellent in handling performance. A separator for an electricity storage device having a polyolefin microporous film and a thermoplastic polymer coating layer covering at least a part of at least one of surfaces of the polyolefin microporous film, in which the thermoplastic polymer coating layer, on the polyolefin microporous film, has a portion containing a thermoplastic polymer and a portion not containing the thermoplastic polymer in a sea-island configuration, the thermoplastic polymer coating layer contains the thermoplastic polymer having at least two glass-transition temperatures, at least one of the glass-transition temperatures is in a range of less than 20&#xb0; C. and at least one of the glass-transition temperatures is in a range of 20&#xb0; C. or more.

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Tokyo, Japan

Takashi Shuto