Asahi Kasei Kabushiki Kaisha

Masanori Nakazawa

Hiroshi Miyazawa

Hiroshi Hatayama

Masatoshi Ikemi

Naoki Machida

Provided is a separator for electricity storage devices, which comprises an active layer that contains a material (A) that is capable of absorbing lithium (Li), and which has an air permeability of 650 s/100 ml or less.

Separator including active layer having lithium-occluding material, and electricity storage device including the same

This separator for electricity storage devices comprises a porous base and a thermoplastic polymer layer that is arranged in at least a part of the outermost surface of at least one surface of the porous base, and wherein: a thermoplastic polymer contained in the thermoplastic polymer layer contains a copolymer that has, as a monomer unit, an ethylenically unsaturated monomer (P) having a polyalkylene glycol group; and the thermoplastic polymer layer contains the thermoplastic polymer in an amount of more than 3% by mass but 100% by mass or less if the thermoplastic polymer layer is taken as 100% by mass.

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Tokyo, Japan

Masanori Nakazawa