CPC H01M 10/052 (2013.01) [H01M 50/403 (2021.01); H01M 50/414 (2021.01); H01M 50/417 (2021.01); H01M 50/42 (2021.01); H01M 50/449 (2021.01); H01M 50/451 (2021.01); H01M 50/457 (2021.01)] | 9 Claims |
1. A separator for lithium-sulfur batteries comprising:
a separator substrate;
a first coating layer on at least one surface of the separator substrate, said first coating layer comprising a polydopamine; and
a second coating layer on the first coating layer, said second coating layer comprising a lithium-substituted water-soluble polymer,
wherein the water-soluble polymer is formed through polymerization of a monomer containing one or more carboxyl groups, and the water-soluble polymer contains the carboxyl groups,
wherein at least 50% of hydrogen present in the carboxylic groups of the water-soluble polymer is substituted with lithium,
wherein the second coating layer is prepared by adding a lithium precursor to the water-soluble polymer in an amount of 50 to 200 mol % based on the carboxyl groups of the water-soluble polymer, and mixing the lithium precursor and the water-soluble polymer,
wherein the first coating layer has a thickness of 0.1 μm to 100 μm,
the second coating layer has a thickness of 0.1 μm to 100 μm, and
the separator substrate is a polyethylene film or a polypropylene film.
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8. A lithium-sulfur battery comprising:
the separator defined in claim 1;
a positive electrode;
a negative electrode; and
an electrolyte solution,
wherein the separator is interposed between the positive electrode and the negative electrode.
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