Separator and electrochemical device having the same
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United States of America Patent
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Oct 10, 2017
Grant Date -
Oct 3, 2013
app pub date -
May 28, 2013
filing date -
Nov 1, 2011
priority date (Note) -
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Abstract
The present invention provides a separator having a porous substrate; and a porous coating layer formed on one surface of the porous substrate and comprising a mixture of inorganic particles and a binder polymer, which has a value of a porosity×an air permeability per thickness in the range of 5 to 40, the porosity and the air permeability per thickness. The separator having a porous coating layer according to the present invention has a porosity which is controlled depending on the air permeability of the porous substrate, and thus exhibit superior ionic conductivity as well as good mechanical properties, thereby contributing to improve the performance and safety of an electrochemical device.
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