Mitsubishi Paper Mills Limited

Masatoshi Kito

Tomohiro Sato

Kazuchiyo Takaoka

Toshihiro Shigematsu

Masanobu Matsuoka

Keisuke Ooyama

A separator for electrochemical elements includes beaten solvent-spun cellulose fibers and rayon fibers having a fiber diameter of 9.5 &#x3bc;m or less. More preferably, the separator for electrochemical elements has a content of the rayon fibers relative to all fibers of 10 to 25% by mass, and can be applied to electrochemical elements such as electric double layer capacitors, hybrid capacitors, redox capacitors, and lithium secondary batteries. The separator can provide low internal short circuit failure rates and high surface strength.

Separator for electrochemical elements and electrochemical element including separator for electrochemical elements

This invention is to provide a sheet product that is excellent in moisture absorption amount, moisture absorption speed and moisture release speed and is capable of keeping a powder from falling off and that can have a large content of a moisture adsorbent, and the sheet product of this invention contains (a) a moisture adsorbent formed of a tubular or fibrous metal oxide, (b) a cellulosic fibrillated fiber, and (c) an organic fiber having a fineness of 0.01 dtex to 0.45 dtex and is characteristically produced by a paper-making method.

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Tokyo, Japan

Masatoshi Kito