Composition for heat-resistant porous layer, separator, electrochemical battery, and method for fabricating the same

Patent metadata

Field	Value
Publication number	US-10205147-B2
Application number	US-201514984205-A
Country	US
Kind code	B2
Filing date	Dec 30, 2015
Priority date	Dec 30, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A heat resistant porous layer composition for a separator of an electrochemical battery includes a compound represented by Formula 1, an initiator, and a solvent,

wherein Formula 1 is defined herein.

First claim

What is claimed is:

1. A heat resistant porous layer composition for a separator of an electrochemical battery, the composition consisting essentially of:
at least one of a compound represented by Formula 1, an oligomer or a polymer of the compound, and a combination thereof, an initiator, a non-crosslinkable binder resin, and a solvent, or
at least one of the compound represented by Formula 1, an oligomer or a polymer of the compound, and a combination thereof, the initiator, the non-crosslinkable binder resin, inorganic particles, and the solvent,

wherein, in Formula 1,
X 1 to X 3 are each independently an oxyethylene group,
X 4 is an oxyethylene group or a C 1 to C 10 alkyl group,
R 1 to R 4 are each independently a (meth)acrylate group, a hydroxy group, a carboxyl group, an ester group, a cyanate group, an isocyanate group, an amino group, a thiol group, a C 1 to C 10 alkoxy group, a vinyl group, or a heterocyclic group,
a 1 to a 4 are each independently an integer from 1 to 10, and
n 1 to n 3 are each independently an integer from 0 to 10, at least one of n 1 to n 4 being an integer from 1 to 10,
provided that, when X 4 is an oxyethylene group, n 4 is an integer from 1 to 10 and m is 1, and when X 4 is a C 1 to C 10 alkyl group, n 4 is 1 and m is 0,
and wherein the non-crosslinkable binder resin includes one or more of a polyvinylidene fluoride (PVdF)-based polymer, a polymethylmethacrylate, a polyacrylonitrile, a polyvinylpyrrolidone, a polyvinylacetate, a polyethylene oxide, a cellulose acetate, a cellulose acetate butyrate, a cellulose acetate propionate, a cyanoethylpullulan, a cyanoethylpolyvinylalcohol, a cyanoethylcellulose, a cyanoethylsucrose, a pullulan, or an acrylonitrile-butadiene-styrene copolymer.

2. The composition as claimed in claim 1 , wherein the composition consists essentially of the compound represented by Formula 1, the initiator, the non-crosslinkable binder resin, the inorganic particles, and the solvent, wherein the inorganic particles are present in an amount of 50 wt % to 95 wt % based on the total weight of the composition in terms of solid content.

3. The composition as claimed in claim 1 , wherein the polyvinylidene fluoride (PVdF)-based polymer includes one or more of a PVdF-based homopolymer or a PVdF-hexafluoropropylene-based PVdf-hexafluoropropylene-based copolymer.

4. The composition as claimed in claim 1 , wherein a weight ratio of the compound represented by Formula 1 to the non-crosslinkable binder resin ranges from 8:2 to 2:8.

5. A separator for an electrochemical battery, the separator comprising:
a porous substrate; and
a heat resistant porous layer formed on one or both surfaces of the porous substrate using the composition as claimed in claim 1 .

6. A separator for an electrochemical battery, the separator comprising:
a porous substrate; and
a heat resistant porous layer formed on one or both surfaces of the porous substrate, wherein:
the heat resistant porous layer includes a crosslinked binder, the heat resistant porous layer being formed using the composition as claimed in claim 1 , and
the separator has a tensile strength of 50 kgf/cm 2 to 350 kgf/cm 2 , as measured after being left at 200° C. for 10 minutes.

7. The separator as claimed in claim 6 , wherein the separator does not suffer from fracture after being left at 200° C. for 10 minutes.

8. The separator as claimed in claim 6 , wherein the crosslinked binder is formed from the compound represented by Formula 1.

9. The separator as claimed in claim 6 , wherein the composition consists essentially of the compound represented by Formula 1, the initiator, the non-crosslinkable binder resin, the inorganic particles, and the solvent, and wherein the inorganic particles being present in an amount of 50 wt % to 95 wt % based on the total weight of the heat resistant porous layer.

10. The separator as claimed in claim 6 , wherein the non-crosslinkable binder resin includes one or more of a PVdF-based polyvinylidene fluoride (PVdF)-based homopolymer or a PVdF-hexafluoropropylene-based polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP)-based copolymer.

11. The separator as claimed in claim 6 , wherein the separator has an air permeability of 300 sec/100 cc or less.

12. The separator as claimed in claim 6 , wherein the separator has an adhesive strength to the porous substrate of 0.1 N or more.

13. The separator as claimed in claim 6 , wherein the separator has a thermal shrinkage of 10% or less in the MD and the TD, as measured after being left at 150° C. for 60 minutes.

14. An electrochemical battery, comprising: an anode; a cathode; a separator; and an electrolyte, the separator being the separator as claimed in claim 6 .

15. A method for fabricating a separator for an electrochemical battery, the method comprising coating the composition as claimed in claim 1 onto one or both surfaces of a porous substrate, followed by curing the composition to form a heat resistant porous layer.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Park Jin Kyu
• Choi Jong Sup
• Choi Hyeon Sun

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/443

  Particulate material · 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

• H01M50/494

  Tensile strength · CPC title