| CPC H01M 50/446 (2021.01) [H01M 10/052 (2013.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01); H01M 50/449 (2021.01)] | 20 Claims |
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1. An electrochemical device separator comprising
a porous polymer substrate; and
an organic/inorganic composite porous coating layer on at least one side of the porous polymer substrate, said organic/inorganic composite porous coating layer comprising particulate binder polymers, first inorganic particles and second inorganic particles, which second inorganic particles are different from the first inorganic particles,
wherein the particulate binder polymers comprise:
(a) hybrid polymer particles comprising a fluorine-containing polymer and an acrylic-containing polymer; and
(b) acrylic-containing polymer particles, wherein the acrylic-containing polymer particles have an average particle diameter D50 “a” in a range of 1 μm to 7.5 μm,
the first inorganic particles have an average particle diameter D50 “b” in a range of 200 nm to 800 nm,
a/b is in a range of 2 to 15,
the hybrid polymer particles have an average particle diameter D50 smaller than the average particle diameter D50 of the acrylic-containing polymer particles, and
the second inorganic particles have an average particle diameter D50 smaller than or equal to the average particle diameter D50 of the first inorganic particles.
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