Separator containing para-aramid fibers, and electrochemical device including the same
AssigneesDupont Safety & Construction, Inc., Nippon Kososhi Corporation
InventorsYuhei Nishimori, Gaku Matsuoka, Takumi Ichimura, Norihiro Wada
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Abstract
This separator is for electrochemical elements, is to be interposed between a pair of electrodes, and includes para-aramid fibers for holding an electrolytic solution. The separator for electrochemical elements is characterized in that the contained amount of fibers having a fiber diameter of 0.03-0.50 μm is 90 mass % or more, the proportion of the number of fibers having a fiber length not less than 0.05 mm but less than 0.20 mm is 20-30%, and the proportion of the number of fibers having a fiber length not less than 0.20 mm but less than 5.00 mm is 70-80%.
Claims7
A separator for an electrochemical element that comprises 80% by mass or more para-aramid fibers for retaining an electrolyte and that is interposed between a pair of electrodes, characterized in that the content of the para-aramid fibers that are 0.03 to 0.50 μm in diameter is 90% by mass or more, the proportion of the number of the para-aramid fibers that are 0.05 mm to less than 0.20 mm in length is 20 to 30%, and the proportion of the number of the para-aramid fibers that are 0.20 mm to less than 5.00 mm in length is 70 to 80%.
Dependencies are inferred from the claim text.