Non-aqueous electrolyte secondary battery separator, non-aqueous electrolyte secondary battery, and method for producing non-aqueous electrolyte secondary battery separator
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United States of America Patent
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Apr 23, 2024
Grant Date -
Jan 21, 2021
app pub date -
Feb 13, 2019
filing date -
Mar 16, 2018
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Abstract
An object of the present disclosure is to provide a nonaqueous electrolyte secondary battery separator which has high heat resistance and is resistant to the detachment of a heat resistant layer. A nonaqueous electrolyte secondary battery according to an example embodiment includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The separator includes a polyolefin substrate and a heat resistant layer disposed on a side of the substrate. The heat resistant layer includes an aramid resin, and the aramid resin has a ratio (B/A) of 0.94 to 1.14 wherein A is the absorbance at a wavelength of 1318 cm−1 and B is the absorbance at a wavelength of 1650 cm−1 in an infrared absorption spectrum obtained by infrared spectroscopic measurement.
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