Mitsubishi Paper Mills Limited

Masatoshi Midorikawa

Takahiro Tsukuda

Tomohiro Sato

Kenji Hyodo

Kazuchiyo Takaoka

Toshihiro Shigematsu

Mitsuo Yoshida

The present invention discloses a separator for an electrochemical element which comprises wet nonwoven fabric containing fibrillated cellulose, non-fibrillated fiber, and fibrillated heat-resistant fiber having all of a softening point, a melting point and a thermal decomposition temperature of 250&#xb0; C. or higher and 700&#xb0; C. or lower, and dimensional change rates of MD and CD subjected the wet nonwoven fabric to heat treatment at 250&#xb0; C. for 50 hours of each &#x2212;3% to +1%.

Separator for electrochemical element

A porous sheet which has good balance between electrolytic solution permeability and dry-up resistance, is superior in high-rate property, and is suitable for a separator for an electrochemical element, and a manufacturing method thereof are provided. The present invention relates to a porous sheet comprising a porous substrate containing non-fibrillar fibers having an average fiber diameter of 0.01-10 &#x3bc;m and a net-like structural body composed of a polymer, the net-like structural body having penetrating pores with a pore diameter of 0.01-10 &#x3bc;m, wherein the net-like structural body is present at the surface and at the internal of the porous substrate and the non-fibrillar fibers having an average fiber diameter of 0.01-10 &#x3bc;m and the net-like structural body are entangled; to a separator for an electrochemical element comprising the porous sheet; and to a method for manufacturing the porous sheet.

Porous sheet, separator for electrochemical element, and method for manufacturing porous sheet

The present invention provides a separator for an electric double layer capacitor comprising a porous sheet containing fibrillated heat-resistant fibers, polyester fibers having a fineness of 0.01 dtex to less than 0.10 dtex, and fibrillated cellulose, which is suitable for use as a separator for an electric double layer capacitor operating at high voltages of 3 V or more.

Separator for an electric double layer capacitor

The present invention provide a separator for an electrochemical device which comprises a wet nonwoven fabric comprising one or more kinds of fibrillated organic fibers which are at least partially fibrillated into a fiber diameter of 1 &#x3bc;m or less, and one or more kinds of unfibrillated organic fibers having a fineness of 0.5 dtex or less, which exhibits excellent heat resistance, electrolyte holding properties, internal short-circuit preventing property, and winding property, which results in a lowered internal resistance and prolonged life of an electrochemical device, and a method for producing the same and an electrochemical device.

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Tokyo, Japan

Masatoshi Midorikawa