Separator for electrochemical elements, and electrochemical element comprising same
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United States of America Patent
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Mar 30, 2021
Grant Date -
Aug 15, 2019
app pub date -
Oct 17, 2017
filing date -
Oct 17, 2016
priority date (Note) -
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Abstract
An object of the invention is to provide a separator for an electrochemical element in which the occurrence of fluff on the sheet surface thereof is suppressed and an internal short-circuit defect rate is low, and the invention provides a separator for an electrochemical element, comprising: a fibrillated solvent spun cellulose fiber; and a synthetic fiber, wherein the separator for an electrochemical element contains, as the synthetic fiber, from 5 to 40% by weight of a core-sheath type composite fiber having a fiber diameter of 6.0 μm or less which is composed of: a core component made of a resin having a melting point of 160° C. or more; and a sheath component made of polyethylene.
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