Separator for electric double layer capacitor

Abstract

Disclosed is a separator for electric double layer capacitors which is composed of a porous sheet containing a fibrillated heat-resistant fiber, a polyester fiber having a fineness of not less than 0.01 dtex and less than 0.10 dtex, and a fibrillated cellulose. The separator for electric double layer capacitors is suitable for an electric double layer capacitor which operates at a high voltage of not less than 3 V.

Description

technical field [0001] The present invention relates to a separator for electric double layer capacitors. Background technique [0002] Conventionally, paper separators mainly composed of solvent-spun cellulose fibers or regenerated cellulose fibers have been used as separators for electric double layer capacitors (for example, refer to Patent Documents 1 to 3). Conventionally, electrodes made of activated carbon have been used as electrodes for electric double layer capacitors, but the energy density and power density are insufficient for applications such as auxiliary power supplies for automobiles and trains. Since the energy density and power density increase in direct proportion to the square of the voltage, the improvement of electrode materials is active. Compared with the upper limit voltage of the previous activated carbon electrode, which is about 2.5-2.7V, the upper limit voltage of the recently developed activated carbon electrode is about 3.7-4.2V. working elec...

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Problems solved by technology

However, this spacer has problems in internal resistance, leakage current, capacity retention rate, and vibration resistance

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