| CPC H01M 50/446 (2021.01) [H01M 10/0525 (2013.01); H01M 10/0587 (2013.01); H01M 50/414 (2021.01); H01M 50/431 (2021.01); H01M 50/449 (2021.01); H01M 2220/20 (2013.01)] | 13 Claims |
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1. A separator for a lithium battery, the separator comprising:
a porous substrate; and
a coating layer disposed on a surface of the porous substrate, the coating layer comprising organic particles, a binder, and inorganic particles, the organic particles having a melting point of 100° C. to 130° C., the binder having a melting point higher than the melting point of the organic particles by 30° C. or more,
wherein the organic particles are coated by the binder,
wherein the organic particles comprise at least one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinylidene fluoride, polymethyl methacrylate, an acrylate compound, polyacrylonitrile, an azodicarbonamide compound, derivatives thereof, and copolymers thereof,
wherein the binder comprises at least one selected from the group consisting of a sulfonate compound and a derivative thereof, an acrylamide compound and a derivative thereof, an acrylonitrile compound and a derivative thereof, an acrylic acid and a derivative thereof, copolymers thereof, and mixtures thereof,
wherein a content of the organic particles is more than 50 wt % based on a total weight of the organic particles and the inorganic particles,
wherein the inorganic particles comprise at least one selected from the group consisting of alumina, boehmite, BaSO4, MgO, Mg(OH)2, clay, silica, and TiO2,
wherein a content of the binder is in a range of 1 wt % to 15 wt % based on a total weight of the organic particles and the binder, and
wherein the binder has a matrix form of a network structure.
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