Separator for rechargeable battery and rechargeable battery including the same

Patent metadata

Field	Value
Publication number	US-10340493-B2
Application number	US-201615338496-A
Country	US
Kind code	B2
Filing date	Oct 31, 2016
Priority date	Nov 5, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A separator for a rechargeable battery includes a porous substrate and a heat-resistant layer disposed on at least one surface of the porous substrate, wherein the heat-resistant layer includes a compound represented by Chemical Formula 1 or a cross-linked product thereof and a rechargeable lithium battery includes the same.

(R) n1 —Ar—OH  [Chemical Formula 1]

In Chemical Formula 1, Ar, R, and n1 are the same as described in the detailed description.

First claim

What is claimed is:

1. A separator for a rechargeable battery, the separator comprising:
a porous substrate, and
a heat-resistant layer on at least one surface of the porous substrate
wherein the heat-resistant layer includes a compound represented by Chemical Formula 1 or a cross-linked product thereof:
(R) n1 —Ar—OH  [Chemical Formula 1]

wherein, in Chemical Formula 1,
Ar is a C6 to C20 aryl group;
n1 is an integer ranging from 5 to 19;
the Rs are the same or different and are independently hydrogen, a substituted or unsubstituted C1 to C50 alkyl group, a substituted or unsubstituted C2 to C50 alkenyl group, a substituted or unsubstituted C2 to C50 alkynyl group, a substituted or unsubstituted C3 to C50 cycloalkyl group, a substituted or unsubstituted C3 to C50 cycloalkenyl group, a substituted or unsubstituted C3 to C50 cycloalkynyl group, a substituted or unsubstituted C1 to C50 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a halogen atom, a hydroxy group, a cyano group, or a combination thereof; and
at least one R is a substituted or unsubstituted C2 to C50 alkenyl group.

2. The separator as claimed in claim 1 , wherein the compound represented by Chemical Formula 1 is a compound represented by Chemical Formula 1a:

wherein, in Chemical Formula 1a,
R 1 to R 5 are independently hydrogen, a substituted or unsubstituted C1 to C50 alkyl group, a substituted or unsubstituted C2 to C50 alkenyl group, a substituted or unsubstituted C2 to C50 alkynyl group, a substituted or unsubstituted C3 to C50 cycloalkyl group, a substituted or unsubstituted C3 to C50 cycloalkenyl group, a substituted or unsubstituted C3 to C50 cycloalkynyl group, a substituted or unsubstituted C1 to C50 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a halogen atom, a hydroxy group, a cyano group, or a combination thereof, and
at least one of R 1 to R 5 is a substituted or unsubstituted C2 to C50 alkenyl group.

3. The separator as claimed in claim 2 , wherein at least one of R 1 to R 5 of Chemical Formula 1a is a hydroxy group.

4. The separator as claimed in claim 3 , wherein R 1 of Chemical Formula 1a is a hydroxy group.

5. The separator as claimed in claim 4 , wherein R 5 of Chemical Formula 1 a is a substituted or unsubstituted C2 to C50 alkenyl group.

6. The separator as claimed in claim 1 , wherein:
the heat-resistant layer includes the cross-linked product of the compound represented by Chemical Formula 1, and
the cross-linked product of the compound represented by Chemical Formula 1 has a weight average molecular weight of about 1,000 g/mol to about 50,000 g/mol.

7. The separator as claimed in claim 1 , wherein the heat-resistant layer further includes at least one of a cross-linkable compound differing from the compound represented by Chemical Formula 1 and a non-cross-linkable compound.

8. The separator as claimed in claim 1 , wherein the heat-resistant layer further includes polyvinylidene fluoride (PVdF), a polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) copolymer, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, a polyethylene-vinylacetate copolymer, polyethyleneoxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinyl alcohol, cyanoethyl cellulose, cyanoethylsucrose, pullulan, carboxymethyl cellulose, an acrylonitrile-styrene-butadiene copolymer, or a combination thereof.

9. The separator as claimed in claim 1 , wherein the heat-resistant layer further includes an inorganic filler, an organic filler, an organic/inorganic filler, or a combination thereof.

10. The separator as claimed in claim 9 , wherein:
the heat-resistant layer includes the inorganic filler, and
the inorganic filler is or includes a metal oxide, a semi-metal oxide, a metal fluoride, a metal hydroxide, or a combination thereof.

11. The separator as claimed in claim 9 , wherein:
the heat-resistant layer includes the organic filler, and
the organic filler is or includes an acrylic compound, an imide compound, an amide compound, or a combination thereof.

12. The separator as claimed in claim 9 , wherein:
the heat-resistant layer includes the inorganic filler, and
the inorganic filler is or includes Al 2 O 3 , SiO 2 , TiO 2 , SnO 2 , CeO 2 , MgO, NiO, CaO, GaO, ZnO, ZrO 2 , Y 2 O 3 , SrTiO 3 , BaTiO 3 , Mg(OH) 2 , Mg 3 (OH) 2 Si 4 O 10 , or a combination thereof.

13. The separator as claimed in claim 1 , wherein the porous substrate includes a polyolefin.

14. The separator as claimed in claim 1 , wherein the porous substrate includes a single layer or two or more layers.

15. A rechargeable lithium battery, comprising
a positive electrode,
a negative electrode, and
a separator as claimed in claim 1 between the positive electrode and the negative electrode.

16. A separator for a rechargeable battery, the separator comprising:
a porous substrate, and
a heat-resistant layer on at least one surface of the porous substrate
wherein the heat-resistant layer includes a compound represented by Chemical Formula 1a or a cross-linked product thereof:

wherein, in Chemical Formula 1a,
R 1 is a hydroxy group,
R 5 is a substituted or unsubstituted C2 to C50 alkenyl group, and
R 2 to R 4 are independently hydrogen, a substituted or unsubstituted C1 to C50 alkyl group, a substituted or unsubstituted C2 to C50 alkenyl group, a substituted or unsubstituted C2 to C50 alkynyl group, a substituted or unsubstituted C3 to C50 cycloalkyl group, a substituted or unsubstituted C3 to C50 ycloalkenyl group, a substituted or unsubstituted C3 to C50 cycloalkynyl group, a substituted or unsubstituted C1 to C50 alkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C3 to C30 heterocyclic group, a halogen atom, a hydroxy group, a cyano group, or a combination thereof.

Assignees

• Samsung Sdi Co Ltd
• Samsung Electronics Co Ltd
• Smasung Sdi Co Ltd

Inventors

• Jang Jungsue
• Cho Minho
• Han Sung Soo
• Kim Hana
• Lee Byungmin
• Moon Jun Hyuk
• Park Myungkook
• Yang Seungrim
• Choi Hyoungwoo

Classifications

• C09D5/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/423

  Polyamide resins · CPC title