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SEPARATOR FOR SECONDARY BATTERY COMPRISING DUAL POROUS COATING LAYERS OF INORGANIC PARTICLES WITH DIFFERENT AVERAGE PARTICLE DIAMETER, SECONDARY BATTERY COMPRISING THE SAME, AND METHOD FOR PREPARING THE SEPARATOR
SEPARATOR FOR SECONDARY BATTERY COMPRISING DUAL POROUS COATING LAYERS OF INORGANIC PARTICLES WITH DIFFERENT AVERAGE PARTICLE DIAMETER, SECONDARY BATTERY COMPRISING THE SAME, AND METHOD FOR PREPARING THE SEPARATOR
The present invention relates to a separation film for a secondary battery including a double porous coating layer of inorganic particles having different average diameters, the secondary battery including the same, and a method for manufacturing the separation film. According to an embodiment of the present invention, the provided separation film for the secondary battery includes a porous basic material, a first porous coating layer, and the second porous coating layer. According to a different embodiment of the present invention, the provided method for manufacturing the separation film for the secondary battery includes the following steps of forming first slurry, forming second slurry, forming the first porous coating layer, and forming the second porous coating layer. According to an aspect of the present invention, the present invention not only reduces the thermal contraction of the separation film but also improves the output of the battery which includes the separation film.
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