KR20130122570A - Method for manufacturing separator and electrochemical device comprising separator manufactured by the method - Google Patents

Abstract

Disclosed are a manufacturing method of a separator, and an electrochemical device equipped with a separator manufactured by the method. The manufacturing method of a separator according to the present invention comprises the following steps: a step of preparing a first planar non-woven fabric material which is made of first fibers and has pores; a step of coating the surface of the first non-woven fabric material with a solvent; a step of attaching a second planar non-woven fabric material, which is made of second fibers and has pores, to the surface of the first non-woven fabric material coated with the solvent; and a step of connecting the first and second fibers together by dissolving the surfaces of the first and second fibers contained in each surface of the first and second non-woven fabric materials which are attached to and in contact with each other. According to the present invention, the mechanical strength of a separator can be improved, a separator with a constant strength without deviation can be manufactured, and a uniform pore size in a separator can be secured, all by attaching multiple non-woven fabric materials. In addition, a thin separator can be manufactured by preventing the fibers forming the non-woven fabric material from being flocculated by heat or an adhesive. [Reference numerals] (AA) Before being processed;(BB) After being processed

Description

Method for manufacturing separator and electrochemical device comprising separator manufactured by the method

The present invention relates to a method for manufacturing a separator of an electrochemical device, such as a lithium secondary battery, and an electrochemical device including a separator manufactured by the method, and more particularly, formed by attaching a plurality of nonwoven substrates having pores to each other. A method for producing a separator and an electrochemical device comprising a separator produced by the method.

Recently, interest in energy storage technology is increasing. As the application fields of cell phones, camcorders, notebook PCs and even electric vehicles are expanding, efforts for research and development of electrochemical devices are becoming more and more specified. The electrochemical device has received the most attention in this respect. Of these, the development of a rechargeable secondary battery has become a focus of attention. Recently, in developing such a battery, Research and development on the design of electrodes and batteries are underway.

Among the currently applied secondary batteries, the lithium secondary battery developed in the early 1990s has advantages such as higher operating voltage and higher energy density than conventional batteries such as Ni-MH, Ni-Cd and sulfuric acid-lead batteries using an aqueous electrolyte solution .

Such electrochemical devices are produced in many companies, but their safety characteristics are different. It is very important to evaluate the safety and safety of such an electrochemical device. The most important consideration is that the electrochemical device should not cause injury to the user in case of malfunction. For this purpose, safety standards strictly regulate the ignition and smoke in the electrochemical device. In the safety characteristics of the electrochemical device, there is a high possibility that the electrochemical device is overheated and thermal explosion occurs or an explosion occurs when the separator is penetrated. In particular, when a porous nonwoven substrate is used as the separator of the electrochemical device, the manufacturing cost is reduced, but the mechanical strength is weak.

In order to overcome this disadvantage, a method of using a plurality of nonwoven substrates attached to each other as a separator of an electrochemical device has been proposed. Examples of the method include a method in which a plurality of nonwoven substrates are heated, followed by compression and thermal bonding to each other, a method of penetrating an adhesive onto the fibers of the nonwoven substrate, and then chemically bonding with other nonwoven substrates. .

However, the above methods may cause difficulty in forming strength deviations between the surface and the inside of the nonwoven substrate or securing uniformity of the pore size, and have limitations on the material used as the adhesive due to electrochemical stability. have. In addition, in the case of attaching after applying heat or by using an adhesive, the fibers forming the nonwoven fabric may be aggregated by the heat or the adhesive, and the thickness of the manufactured separator may be thickened.

Accordingly, the problem to be solved by the present invention is to solve the above-mentioned problems, to improve the mechanical strength of the nonwoven fabric substrate forming the separator of the electrochemical device, and to control the pore size by the method of manufacturing a separator and the method It is to provide an electrochemical device having a manufactured separator.

In order to solve the above problems, according to an aspect of the present invention, the step of providing a planar first nonwoven substrate formed of first fibers, having pores; Applying a solvent to a surface of the first nonwoven substrate; Attaching a planar second nonwoven substrate formed of second fibers and having pores to a surface of the solvent-coated first nonwoven substrate; And dissolving the surfaces of the first fibers and the second fibers present on respective surfaces of the attached and abutted first nonwoven substrate and the second nonwoven substrate, thereby connecting the first fibers and the second fibers to each other. It provides a method for producing a separator comprising a;

Here, the first fiber and the second fiber, independently of each other, polyolefin (polyolefin), polyester (polyester), polyacetal (polyacetal), polyamide (polyamide), polycarbonate, polyimide (polyimide) , Polyetheretherketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfide, polyacrylonitrile and polyethylenenaphthalene It may be any one or a mixture of two or more.

The solvent may be any one selected from the group consisting of acetic acid, aqua regia, N-methylpyrrolidone, water, and liquid bromine or a mixture of two or more thereof.

The first fibers and the second fibers may have an average thickness of 0.5 μm to 10 μm independently of each other.

The first nonwoven substrate and the second nonwoven substrate may have a porosity of 30% to 80% and a thickness of 10 μm to 30 μm independently of each other.

And coating a porous coating layer on a surface of the first nonwoven fabric substrate or the second nonwoven substrate, which is performed after the attaching step, wherein the porous coating layer is formed of inorganic particles and inorganic particles. Located on part or all of the surface may include a binder polymer for connecting and fixing between the inorganic particles.

Here, the average particle diameter of the inorganic particles may be 0.001㎛ to 10㎛.

The inorganic particles may be inorganic particles selected from the group consisting of inorganic particles having a dielectric constant of 5 or more, inorganic particles having lithium ion transfer ability, and mixtures thereof.

In addition, the inorganic particles having a dielectric constant of 5 or more include BaTiO ₃ , Pb (Zr _x , Ti _{1- x} ) O ₃ (PZT, where 0 <x <1), and Pb _{1 - x} La _x Zr _{1 -y} Ti _y O ₃ (PLZT, where 0 <x <1, 0 <y <1), (1-x) Pb (Mg _1/3 Nb _2/3 ) O ₃ -xPbTiO ₃ (PMN-PT, where , 0 <x <1), Hafnia (HfO ₂ ), SrTiO ₃ , SnO ₂ , CeO ₂ , MgO, NiO, CaO, ZnO, ZrO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , SiC and TiO ₂ It may be any one inorganic particles selected from the group consisting of or a mixture of two or more thereof.

The inorganic particles having the lithium ion transferring ability include lithium phosphate (Li ₃ PO ₄ ), lithium titanium phosphate (Li _x Ti _y (PO ₄ ) ₃ , 0 <x <2, 0 <y < (Li _x Al _y Ti _z (PO ₄ ) ₃ , 0 <x <2, 0 <y <1, 0 <z <3), (LiAlTiP) _x O _y- 0 <y <13), lithium lanthanum titanate (Li _x La _y TiO _{3 ,} 0 <x <2, 0 <y <3), lithium germanium thiophosphate (Li _x Ge _y P _z S _w , x <4, 0 <y < 1, 0 <z <1, 0 <w <5), lithium nitrides _{(Li x N y, 0 <} x <4, 0 <y <2), SiS 2 (Li x _{Si y S z, 0 <x} <3, 0 <y <2, 0 <z <4) based glass, and _{P 2 S 5 (Li x P} y S z, 0 <x <3, 0 <y <3, 0 < z < 7) series glass, or a mixture of two or more thereof.

The binder polymer may include polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride-co-trichloro ethylene, and polyvinylidene fluorine. Polyvinylidene fluoride-co-chlorotrifluoro ethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate , Ethylene vinyl co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, Cyanoethylpullulan, Cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethyl sucrose, pullulan, carboxyl methyl cellulose, acrylonitrile styrenebutadiene copolymer -any one selected from the group consisting of -styrene-butadiene copolymer) and polyimide (polyimide) or a mixture of two or more thereof.

On the other hand, according to another aspect of the present invention, in the electrochemical device comprising a cathode, an anode, and a separator interposed between the cathode and the anode, wherein the separator is a separator manufactured by the manufacturing method of the present invention An electrochemical device is provided.

Here, the electrochemical device may be a lithium secondary battery.

According to one embodiment of the present invention, by using a non-woven substrate having a relatively lower cost than a conventional separator substrate for manufacturing the separator, it is possible to reduce the manufacturing cost of the electrochemical device.

In addition, by attaching a plurality of nonwoven substrates, not only the mechanical strength of the separator is improved, but also a separator of a constant strength can be manufactured without variation, and a uniform pore size of the separator can be ensured.

In addition, a thinner separator can be produced by preventing the fibers forming the nonwoven fabric substrate from agglomerating by heat or adhesive.

In addition, by dissolving and adhering the surfaces of the fibers forming the nonwoven substrate, the contacts between the fibers may be widened, or the number of contacts may be increased to form pores of small size, and the strength of the separator may be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and together with the description of the invention serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
1 is a SEM photograph showing a state before and after dissolving the surface of the fibers constituting the nonwoven substrate according to an embodiment of the present invention.
FIG. 2 is an enlarged SEM photograph of the surface of the fibers of FIG. 1. FIG.

Hereinafter, the present invention will be described in detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the constitutions described in the embodiments described herein are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents which can be substituted at the time of application It should be understood that variations can be made.

The method of manufacturing a separator according to the present invention comprises the steps of: preparing a planar first nonwoven substrate formed of first fibers and having pores; Applying a solvent to a surface of the first nonwoven substrate; Attaching a planar second nonwoven substrate formed of second fibers and having pores to a surface of the solvent-coated first nonwoven substrate; And dissolving the surfaces of the first fibers and the second fibers present on respective surfaces of the attached and abutted first nonwoven substrate and the second nonwoven substrate, thereby connecting the first fibers and the second fibers to each other. It comprises; a.

The use of a porous nonwoven substrate as a separator for an electrochemical device has the advantage of reducing its manufacturing cost, but has a problem of weak mechanical strength, and thus a plurality of nonwoven substrates are attached to each other and used as a separator for an electrochemical device.

As the attachment method, as described above, if the surfaces of the fibers forming the nonwoven substrate are dissolved and then attached to each other, the thickness of the separator can be prevented from increasing, the mechanical strength is improved, and the constant strength without variation is achieved. The separator can be manufactured, and a uniform pore size of the separator can be ensured.

Here, the structures of the first nonwoven substrate and the second nonwoven substrate may be spunbond nonwoven fabric or melt blown nonwoven fabric composed of long fibers independently of each other.

In addition, the first fiber and the second fiber, independently of each other, polyolefin (polyolefin), polyester (polyester), polyacetal (polyacetal), polyamide (polyamide), polycarbonate, polyimide (polyimide) , Polyetheretherketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfide, polyacrylonitrile and polyethylenenaphthalene It may be any one or a mixture of two or more, in particular, in order to improve the thermal stability of the nonwoven substrate, the melting temperature of the first fiber and the second fiber may be 200 ℃ or more, but is not limited thereto.

The solvent may be any one selected from the group consisting of acetic acid, aqua regia, N-methylpyrrolidone, water, and liquid bromine or a mixture of two or more thereof, and preferably, the solvent is N- Methylpyrrolidone and water may be mixed in a weight ratio of about 1: 9 to 3: 7, but is not limited thereto, and is not limited as long as it can dissolve the first and second fibers.

The solvent is later removed through a drying process, thereby maintaining the pore structure and porosity of the nonwoven substrate.

In addition, the first fiber and the second fiber may have an average thickness of 0.5 μm to 10 μm or 1 μm to 7 μm independently of each other. When the average thickness of the fiber satisfies the numerical range, the nonwoven fabric substrate can be easily manufactured, the mechanical strength of the nonwoven substrate can be improved, and the pore size can be easily controlled.

The method of attaching the second nonwoven substrate to the surface of the first nonwoven substrate may be used without limitation as long as it is a method of attaching and integrating a plurality of conventional nonwoven substrates, and examples thereof include a general press or calendaring.

The first nonwoven substrate and the second nonwoven substrate formed by the first fibers and the second fibers, respectively, are 50% or more based on the total pore number of pores having a long diameter of 0.1 to 70 μm independently of each other, Or 50 to 80%. When the long diameter of the pores satisfies the above range, the nonwoven fabric may be easily manufactured, the lithium ions may be smoothly moved, and the insulation may be prevented from being degraded due to a leak current. And, when the pores of the size described above is 50% or more based on the total number of pores, it is possible to optimally design the configuration and porosity of the nonwoven substrate.

In addition, the first nonwoven substrate and the second nonwoven substrate may have a porosity of 30 to 80% and a thickness of 10 to 30 μm independently of each other. When the thickness of the nonwoven substrate satisfies the above range, it is possible to implement a high-capacity electrochemical device while preventing a short circuit between the cathode and the anode.

Meanwhile, according to the present invention, the method may further include coating a porous coating layer on the surface of the first nonwoven fabric substrate or the second nonwoven substrate, which is performed after the attaching step, wherein the porous coating layer includes inorganic particles. And a binder polymer positioned on part or all of the surface of the inorganic particles to connect and fix the inorganic particles.

By further including the porous coating layer including the inorganic particles and the binder polymer, it is possible to further improve the mechanical strength of the separator, it is possible to control the pore size of the separator can further improve the prevention of leakage current generation. In addition, even when the separator is melted during the overheating of the electrochemical device, the cathode and the anode are prevented from being shorted.

The inorganic particles that can be used in one embodiment of the present invention are not particularly limited as long as they are electrochemically stable. That is, the inorganic particles that can be used in one embodiment of the present invention are particularly limited as long as the oxidation and / or reduction reactions do not occur in the operating voltage range (for example, 0 to 5 V on the basis of Li / Li ⁺ ) of the applied electrochemical device. It doesn't work. Particularly, when inorganic particles having a high dielectric constant are used as the inorganic particles, the dissociation of the electrolyte salt, for example, the lithium salt in the liquid electrolyte, can be increased, and the ion conductivity of the electrolyte can be improved.

For the reasons stated above, the inorganic particles may include high-permittivity inorganic particles having a dielectric constant of 5 or more, or 10 or more. Nonlimiting examples of inorganic particles having a dielectric constant of 5 or more include BaTiO ₃ , Pb (Zr _x , Ti _{1 -x} ) O ₃ (PZT, where 0 <x <1), Pb _{1 -x} La _x Zr _{1- y} Ti _y O ₃ (PLZT, where, 0 <x <1, 0 <y <1 Im), (1-x) Pb (Mg 1/3 Nb 2/3) O 3 -xPbTiO 3 (PMN-PT, where, 0 <x <1 Im), hafnia _{(HfO 2), SrTiO 3,} SnO 2, CeO 2, MgO, NiO, CaO, ZnO, ZrO 2, Y 2 O 3, Al 2 O 3, SiC and TiO ₂ , or a mixture of two or more thereof.

As the inorganic particles, inorganic particles having a lithium ion transferring ability, that is, inorganic particles containing a lithium element but having a function of transferring lithium ions without storing lithium can be used. Non-limiting examples of inorganic particles having lithium ion transferring ability include lithium phosphate (Li ₃ PO ₄ ), lithium titanium phosphate (Li _x Ti _y (PO ₄ ) ₃ , 0 <x <2, 0 <y < (Li _x Al _y Ti _z (PO ₄ ) ₃ , 0 <x <2, 0 <y <1, 0 <z <3), 14Li ₂ O-9Al ₂ O ₃ -38TiO ₂ -39P ₂ O ₅ Such as (LiAlTiP) _x O _y series glass (0 <x <4, 0 <y <13), lithium lanthanum titanate (Li _x La _y TiO ₃ , 0 <x <2, 0 <y <3), Li Lithium germanium thiophosphate such as _3.25 Ge _0.25 P _0.75 S _4, etc. (Li _x Ge _y P _z S _w , 0 <x <4, 0 <y <1, 0 <z <1, 0 <w <5), Lithium nitride, such as Li ₃ N (Li _x N _y , 0 <x <4, 0 <y <2), Li ₃ PO ₄ -Li ₂ S-SiS ₂ SiS ₂ series glass such as Li _x Si _y S _z , 0 <x <3, 0 <y <2, 0 <z <4), LiI-Li ₂ SP ₂ S ₅ There is P ₂ S ₅ based _{glass (Li x P y S z} , 0 <x <3, 0 <y <3, 0 <z <7) or a mixture thereof as such.

The size of the inorganic particles is not limited, but for the proper porosity of the separator, the average particle size may range from 0.001 탆 to 10 탆.

The binder polymer may include polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride-co-trichloro ethylene, and polyvinylidene fluorine. Polyvinylidene fluoride-co-chlorotrifluoro ethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate , Ethylene vinyl co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, Cyanoethylpullulan, Cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethyl sucrose, pullulan, carboxyl methyl cellulose, acrylonitrile styrenebutadiene copolymer -styrene-butadiene copolymer) and polyimide (polyimide) may be any one or a mixture of two or more selected from the group consisting of, but is not limited thereto.

Meanwhile, the electrochemical device according to the present invention includes a cathode, an anode, and a separator interposed between the cathode and the anode, wherein the separator is a separator manufactured by the manufacturing method of the present invention described above. do.

The electrochemical device of the present invention includes all devices that perform an electrochemical reaction, and specific examples thereof include capacitors such as all kinds of primary, secondary cells, fuel cells, solar cells, or super-capacitor devices . Particularly, a lithium secondary battery including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery is preferable.

The electrode to be applied to the electrochemical device according to the present invention is not particularly limited, and according to a conventional method known in the art, the electrode active material may be prepared in a form bound to the electrode current collector. Non-limiting examples of the cathode active material of the electrode active material may be a conventional cathode active material that can be used for the cathode of the conventional electrochemical device, in particular lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron oxide or a combination thereof One lithium composite oxide can be used. Non-limiting examples of the anode active material may be a conventional anode active material that can be used in the anode of the conventional electrochemical device, in particular lithium metal or lithium alloys, carbon, petroleum coke, activated carbon, Lithium adsorbents such as graphite or other carbons are preferred. Non-limiting examples of the cathode current collector include aluminum, nickel, or a combination thereof, and examples of the anode current collector include copper, gold, nickel, or a copper alloy or a combination thereof Foil to be manufactured, and the like.

Electrolyte that may be used in the present invention is A ⁺ B ^- A salt of the structure, such as, A ⁺ is Li ^+, Na ^+, K ⁺ comprises an alkaline metal cation or an ion composed of a combination thereof, such as, and B ^- is PF _{6 ^{-, BF 4 -, Cl -}} , Br -, I -, ClO 4 -, AsF 6 -, CH 3 CO 2 -, CF 3 SO 3 -, N (CF 3 SO 2) 2 -, C (CF 2 SO _{2) 3} ^- anion, or a salt containing an ion composed of a combination of propylene carbonate (PC like), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC) , Dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethylmethyl carbonate (EMC), gamma-butyrolactone, But are not limited to, those dissolved or dissociated in an organic solvent.

The electrolyte injection may be performed at an appropriate stage of the battery manufacturing process, depending on the manufacturing process and required properties of the final product. That is, it can be applied before assembling the cell or at the final stage of assembling the cell.

The electrochemical device according to the present invention is capable of lamination, stacking, and folding processes of a separator and an electrode in addition to a conventional winding process. The outer shape of the electrochemical device is not particularly limited, but may be a cylindrical shape, a square shape, a pouch shape, a coin shape, or the like using a can.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

Example

To a polyacrylonitrile nonwoven substrate prepared by a melt blown method, a solution obtained by mixing N-methylpyrrolidone and water in a weight ratio of 2: 8 was applied to a portion of the fibers forming the nonwoven substrate. After dissolution, the solution was dried through air, or the wet nonwoven substrate was pressed with a roll and then dried.

1 and 2 are SEM photographs showing the state before and after dissolving the surface of the fibers constituting the nonwoven substrate according to an embodiment of the present invention.

1 and 2, it can be seen that the surface of the fibers constituting the nonwoven substrate by applying the above-described solution is dissolved and adhered to each other, thereby increasing the contact point between the fibers, thereby reducing the size of the pores relatively.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (14)

Providing a planar first nonwoven substrate formed of first fibers and having pores;
Applying a solvent to a surface of the first nonwoven substrate;
Attaching a planar second nonwoven substrate formed of second fibers and having pores to a surface of the solvent-coated first nonwoven substrate; And
Dissolving the surfaces of the first fibers and the second fibers present on the respective surfaces of the attached and abutted first nonwoven substrate and second nonwoven substrate to connect the first fibers and the second fibers to each other. Method of manufacturing a separator comprising a. The method of claim 1,
The first fiber and the second fiber, independently of each other, polyolefin (polyolefin), polyester (polyester), polyacetal (polyacetal), polyamide, polycarbonate, polyimide, polyimide Any one selected from the group consisting of etheretherkeketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfide, polyacrylonitrile and polyethylenenaphthalene A method for producing a separator, characterized in that one or a mixture of two or more. The method of claim 1,
The solvent is any one selected from the group consisting of acetic acid, aqua regia, N-methylpyrrolidone, water and liquid bromine or a mixture of two or more thereof. The method of claim 1,
The first fiber and the second fiber have a mean thickness of 0.5 to 10㎛ independently of each other, the manufacturing method of the separator. The method of claim 1,
The first nonwoven fabric substrate and the second nonwoven fabric substrate, the method of manufacturing a separator, characterized in that containing the pores having a pore length of 0.1㎛ to 70㎛ independently of each other based on the total number of pores by 50%. The method of claim 1,
The first nonwoven substrate and the second nonwoven substrate are each independently having a porosity of 30% to 80% and a thickness of 10 μm to 30 μm. The method of claim 1,
After the attaching step,
Coating a porous coating layer on a surface of the first nonwoven substrate or the second nonwoven substrate;
The porous coating layer, the inorganic particles and a method for producing a separator, characterized in that it comprises a binder polymer located on part or all of the surface of the inorganic particles to connect and fix between the inorganic particles. The method of claim 7, wherein
The average particle diameter of the inorganic particles is a method for producing a separator, characterized in that 0.001㎛ to 10㎛. The method of claim 7, wherein
And said inorganic particles are inorganic particles selected from the group consisting of inorganic particles having a dielectric constant of 5 or more, inorganic particles having lithium ion transfer ability, and mixtures thereof. 10. The method of claim 9,
The inorganic particles having a dielectric constant of 5 or more include BaTiO ₃ , Pb (Zr _x , Ti _{1- x} ) O ₃ (PZT, where 0 <x <1), and Pb _{1 - x} La _x Zr _{1 -y} Ti _y O ₃ (PLZT, where 0 <x <1, 0 <y <1), (1-x) Pb (Mg _1/3 Nb _2/3 ) O ₃ -xPbTiO ₃ (PMN-PT, where 0 <x <1), Hafnia (HfO ₂ ), SrTiO ₃ , SnO ₂ , CeO ₂ , MgO, NiO, CaO, ZnO, ZrO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , SiC and TiO ₂ A method for producing a separator, characterized in that the inorganic particles selected from the group or a mixture of two or more thereof. 10. The method of claim 9,
The inorganic particles having a lithium ion transfer capability include lithium phosphate (Li ₃ PO ₄ ), lithium titanium phosphate (Li _x Ti _y (PO ₄ ) ₃ , 0 <x <2, 0 <y <3), and lithium aluminum titanium Phosphate (Li _x Al _y Ti _z (PO ₄ ) ₃ , 0 <x <2, 0 <y <1, 0 <z <3), (LiAlTiP) _x O _y series glass (0 <x <4, 0 < y <13), lithium lanthanum titanate (Li _x La _y TiO _{3 ,} 0 <x <2, 0 <y <3), lithium germanium thiophosphate (Li _x Ge _y P _z S _w , 0 <x < 4, 0 <y <1, 0 <z <1, 0 <w <5), lithium nitride (Li _x N _y , 0 <x <4, 0 <y <2), SiS ₂ (Li _x Si _y S _z , 0 <x <3, 0 <y <2, 0 <z <4) series glass and P ₂ S ₅ (Li _x P _y S _z , 0 <x <3, 0 <y <3, 0 < z <7) any one inorganic particle selected from the group consisting of series glass or a mixture of two or more thereof. The method of claim 7, wherein
The binder polymer is polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride-co-trichloro ethylene, polyvinylidene fluoride- Chlorotrifluoroethylene (polyvinylidene fluoride-co-chlorotrifluoro ethylene), polymethyl methacrylate (polymethyl methacrylate), polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, ethylene Vinyl acetate co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyano Ethyl pullulan (cyanoethylpullulan), cyano Polyvinyl alcohol (cyanoethylpolyvinylalcohol), cyanoethyl cellulose (cyanoethylcellulose), cyanoethyl sucrose (cyanoethylsucrose), pullulan, carboxyl methyl cellulose, acrylonitrile styrenebutadiene copolymer (acrylonitrile-styrene -butadiene copolymer) and a polyimide (polyimide) any one selected from the group consisting of or a mixture of two or more thereof. An electrochemical device comprising a cathode, an anode, and a separator interposed between the cathode and the anode,
The separator is an electrochemical device, characterized in that the separator manufactured by the manufacturing method of any one of claims 1 to 12. The method of claim 13,
Wherein the electrochemical device is a lithium secondary battery.

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