Separator having coating layer with ternary acrylic copolymer and inorganic particles with different particle diameters, and lithium secondary battery comprising same
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United States of America
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Feb 18, 2025
Grant Date -
Feb 3, 2022
app pub date -
Aug 9, 2019
filing date -
Aug 9, 2019
priority date (Note) -
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Abstract
The present invention relates to a separator for a lithium secondary battery, and a lithium secondary battery including the same. The separator includes a porous substrate, and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes a binder including a (meth)acrylic copolymer including a first structural unit derived from (meth)acrylamide, and a second structural unit including at least one of a structural unit derived from (meth)acrylic acid or (meth)acrylate, and a structural unit derived from (meth)acrylamidosulfonic acid or a salt thereof; first inorganic particles; and second inorganic particles, wherein the first inorganic particles have an average particle diameter of 400 to 600 nm, the average particle diameter of the second inorganic particles is smaller than the average particle diameter of the first inorganic particles.
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