Samsung Sdi Co., Inc.

Hyeonsun Choi

Jungyoon Lee

Yangseob Kim

Yongkyoung Kim

Dongwan Seo

Yeonjoo Choi

Gain Kim

Jinkyu Park

Sam-Jin Park

Ickkyu Choi

Jungjoon Park

Jinyoung Kim

Changhong Ko

YangSeob Kim

Keewook Kim

A separator for a rechargeable lithium battery and a rechargeable lithium battery including the separator, the separator including a porous substrate, and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes a heat resistant binder including a (meth)acryl copolymer including a first structural unit and a second structural unit, the first structural unit being a structural unit of a (meth)acrylamide and the second structural unit being a structural unit of a (meth)acrylic acid, a (meth)acrylate, a (meth)acrylonitrile, a (meth)acrylamido sulfonic acid, a (meth)acrylamido sulfonate salt, or a combination thereof; polyethylene particles; and first inorganic particles, and an average particle size (D50) of the first inorganic particles is larger than an average particle size (D50) of the polyethylene particles.

Separator for rechargeable lithium battery and rechargeable lithium battery including the same

This application relates to a separator and a lithium battery employing the same. In one aspect, the separator includes a porous substrate and a coating layer disposed on a surface of the porous substrate. The coating layer includes organic particles, a first binder, and inorganic particles. The organic particles have a first melting point of about 100° C. to about 130° C. The first binder has a second melting point higher than the first melting point by about 30° C. or more. The organic particles are coated by or embedded in the first binder. The separator can maintain a network structure even at a high temperature, making it possible to improve the high-temperature stability of a lithium battery by employing the separator, as well as delaying a rapid increase in temperature and heat generation when a shutdown occurs.

Separator and lithium battery including the same

The present invention relates to a separator for a lithium secondary battery and a lithium secondary battery including same, the separator including: a porous substrate; and a coating layer on at least one surface of the porous substrate. The coating layer includes a (meth)acrylic copolymer including a first structural unit derived from (meth)acrylamide, a second structural unit derived from (meth)acrylonitrile, and a third structural unit derived from (meth)acrylamido sulfonic acid, (meth)acrylamido sulfonic acid salt, or a combination thereof. The first structural unit is included in an amount of 55 mol % to 90 mol % based on 100 mol % of the (meth)acrylic copolymer and the second structural unit and third structural unit are each independently included in 5 mol % to 40 mol % based on 100 mol % of the (meth)acrylic copolymer. The (meth)acrylic copolymer has a weight average molecular weight of 200,000 to 700,000.

Separator for lithium secondary battery and lithium secondary battery comprising same

The present invention relates to a separator for a lithium secondary battery, and a lithium secondary battery including the same. The separator includes a porous substrate, and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes a (meth)acrylic copolymer including a first structural unit derived from (meth)acrylamide, a second structural unit derived from (meth)acrylonitrile, and a third structural unit including at least one of structural units derived from (meth)acrylamidosulfonic acid, a (meth)acrylamidosulfonic acid salt, or a combination thereof; inorganic particles; and an organic filler; wherein the organic filler is included in an amount of 0.1 to 50 wt % based on a total amount of the organic filler and the inorganic particles.

The present invention relates to a separator for a lithium secondary battery, and a lithium secondary battery including the same. The separator includes a porous substrate, and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes an acrylic copolymer including a first structural unit derived from (meth)acrylamide, and a second structural unit including at least one of a structural unit derived from (meth)acrylic acid or (meth)acrylate, and a structural unit derived from (meth)acrylamidosulfonic acid or a salt thereof; an organic filler; and inorganic particles, wherein the organic filler is included in an amount of 0.1 to 50 wt % based on a total amount of the organic filler and the inorganic particles.

Separator including porous substrate and coating layer of acrylic copolymer, organic filler, and inorganic particles, and lithium secondary battery including the same

The present invention relates to a separator for a lithium secondary battery, and a lithium secondary battery including the same. The separator includes a porous substrate and a coating layer on at least one surface of the porous substrate, wherein the coating layer includes a binder including a (meth)acrylic copolymer including a first structural unit derived from (meth)acrylamide, a second structural unit derived from (meth)acrylonitrile, and a third structural unit derived from (meth)acrylamidosulfonic acid, a (meth)acrylamidosulfonic acid salt or a combination thereof; first inorganic particles; and second inorganic particles, wherein the average diameter of the first inorganic particles is 400 nm to 600 nm, and the average diameter of the second inorganic particles is smaller than the average diameter of the first inorganic particles.

Separator for lithium secondary battery, and lithium secondary battery comprising same

The present invention relates to a separator for a secondary battery and a lithium secondary battery including the separator, the separator including: a porous substrate and a heat-resistant layer disposed on at least one surface of the porous substrate, wherein the heat-resistant layer includes an acrylic heat-resistant binder, an adhering binder, and a filler, the acrylic heat-resistant binder including a structural unit derived from (meth)acrylate or (meth)acrylic acid, a cyano group-containing structural unit, and a sulfonate group-containing structural unit, the adhering binder includes a structural unit including a structural unit including hydroxyl group, a structural unit including an acetate group, and a structural unit including an alkali metal.

Separator for secondary battery and lithium secondary battery comprising same

Disclosed are a separator for a rechargeable battery including a porous substrate and a heat resistance layer on at least one surface of the porous substrate, wherein the heat resistance layer includes an acryl-based heat resistance binder, a water-soluble binder, and a filler, and the acryl-based heat resistance binder includes a structural unit derived from (meth)acrylate or (meth)acrylic acid, a cyano group-containing structural unit and a sulfonate group-containing structural unit, and a rechargeable lithium battery including the same.

Separator for rechargeable battery and rechargeable lithium battery including the same

The present invention relates to a separator for a secondary battery and a lithium secondary battery comprising the same, wherein the separator comprises a porous substrate and a heat-resistant porous layer positioned on at least one surface of the porous substrate, the heat-resistant porous layer comprising a first binder, a second binder, and a filler, the first binder comprising a copolymer having: a first structural unit derived from a first fluorine monomer; a second structural unit derived from a second fluorine monomer; and a third structural unit derived from a monomer comprising at least one functional group selected from a hydroxyl group, a carboxyl group, an ester group, an acid anhydride group, and a derivative thereof, the second binder comprising at least one of a vinylidene fluoride homopolymer and a vinylidene fluoride copolymer.

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Suwon-si, South Korea

Hyeonsun Choi