SEPARATOR FOR ELECTROCHEMICAL DEVICE AND ELECTROCHEMICAL DEVICE INCLUDING THE SEPARATOR
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Sep 11, 2015
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Sep 17, 2014
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Abstract
A separator for an electrochemical device which includes a nonwoven fabric base material and an inorganic particle layer is provided. The nonwoven fabric base material includes a synthetic resin fiber with an average fiber diameter of 1 to 20 μm. The inorganic particle layer includes an inorganic particle layer A that contains magnesium hydroxide with an average particle size of 2.0 to 4.0 μm, and an inorganic particle layer B that contains magnesium hydroxide with an average particle size of not less than 0.5 μm and less than 2.0 μm. The inorganic particle layer A and the inorganic particle layer B are stacked in this order on a surface of the nonwoven fabric base material. Alternatively, the inorganic particle layer A is disposed on a surface of the nonwoven fabric base material and the inorganic particle layer B is disposed on the other surface of the nonwoven fabric base material.
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