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US 2019/0245181 A1Published application
Separator and secondary battery including the separator
AssigneeSumitomo Chemical Company, Limited
InventorsChikae YOSHIMARU, Chikara MURAKAMI, Junji SUZUKI
Life of this patent
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Abstract
Provided is a separator including a separator which consists of a porous polyolefin of 95 wt % or more and an organic additive. A temperature-increase convergence time of the first layer is equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after dipping the first layer in N-methylpyrrolidone containing 3 wt % of water, whereas a white index is equal to or more than 86 and equal to or less than 98.
Claims6
A separator comprising:
- a first layer consisting of a porous polyolefin, having a temperature-increase convergence time equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after dipping the first layer in N-methylpyrrolidone containing 3 wt % of water, and having a white index equal to or more than 86 and equal to or less than 98.
Dependencies are inferred from the claim text.