KR20170112248A - Method for manufacturing a separator and the separator manufactured by the method - Google Patents

Abstract

Preparing an acidic solution having a pH of 2 to 4 by mixing the adsorptive polymer and the aqueous medium; Adding inorganic particles to the acidic solution to form a mixed solution; Adding a water-dispersed binder to the mixed solution to form a coating layer slurry; And coating and drying the coating layer slurry on the porous base material.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separator,

The present invention relates to a process for producing a separator and a separator produced thereby, and more particularly to a process for producing a separator having improved air permeability and a separator produced thereby.

Recently, interest in energy technology has been increasing. As the applications of cell phones, camcorders, notebook PCs and even battery automobiles are expanding, efforts for research and development of electrochemical devices are becoming more and more specified.

The electrochemical device is one of the most attracting fields in this respect. Of these, the development of a rechargeable secondary battery has become a focus of attention. In recent years, in order to improve the capacity density and the specific energy, 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 .

However, such a lithium ion battery has a safety problem such as ignition and explosion when using an organic electrolytic solution, and is disadvantageous in that it is difficult to manufacture. Recently, the lithium ion polymer battery is considered to be one of the next generation batteries by improving the weak point of the lithium ion battery. However, since the capacity of the battery is still relatively low as compared with the lithium ion battery, Is urgently required.

Such electrochemical devices are produced in many companies, but their stability characteristics are different from each other. It is very important to evaluate the safety and safety of such an electrochemical device. The most important consideration is that the battery chemical device should not injure the user in case of malfunction. For this purpose, the safety standard strictly regulates the ignition and fuming in the electrochemical device. In the safety characteristics of a battery chemical element, there is a high possibility that explosion may be caused when the electrochemical element is overheated and thermal runaway occurs or the separator is penetrated. Particularly, the polyolefin-based porous polymer base used as a separator of an electrochemical device exhibits extreme heat shrinkage behavior at a temperature of 100 DEG C or higher due to characteristics of the manufacturing process including material properties and elongation, so that a short circuit between the cathode and the anode There is a problem causing it.

In order to solve the stability problem of the electrochemical small molecule, a separator having a porous organic-inorganic coating layer formed by coating an excess amount of inorganic particles and a binder polymer on at least one surface of a porous polymer substrate having a plurality of pores has been proposed. The inorganic particles contained in the porous organic-inorganic coating layer are excellent in heat resistance, thereby preventing a short circuit between the cathode and the anode even when the electrochemical device is overheated.

The separator formed with such a porous organic-inorganic coating layer is generally manufactured through a process of dip-coating an organic-inorganic coating layer on a porous polymer substrate. However, since such a manufacturing method uses an organic solvent-based slurry, stability may be a problem in the manufacturing process of a battery chemical device, and there is a problem of low environmental friendliness and economical efficiency.

Therefore, compared with the organic solvent-based slurry, the aqueous slurry is safe and environmentally friendly, but the physical properties of the separator prepared according to the characteristics of the slurry composition are greatly changed.

Accordingly, in order to solve the above-mentioned problems, it is an object of the present invention to provide a method for producing a separator capable of ensuring optimum physical properties such as air permeability after coating regardless of the composition of the porous coating layer slurry, and a separator produced thereby The purpose.

According to an aspect of the present invention, there is provided a method of manufacturing a separator in the following embodiments.

Embodiment 1 is a method of preparing an acidic solution having pH 2 to 4 by mixing an adsorption type polymer and a water-based medium, adding inorganic particles to the acidic solution to form a mixed solution, adding an aqueous dispersion binder to the mixed solution To form a coating layer slurry, and coating and drying the coating layer slurry on the porous substrate.

Embodiment 2 is a method for producing a separator according to Embodiment 1, wherein the coating layer slurry contains 0.5 to 5 parts by weight of adsorbing polymer based on 100 parts by weight of inorganic particles.

 Embodiment 3 is a polymer electrolyte membrane according to Embodiment 1 or 2, wherein the adsorptive polymer is selected from the group consisting of carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, ethylcellulose, polyvinyl alcohol, starch oxidase, phosphorylated starch, Of the total amount of the separator.

Embodiment 4 is a method for manufacturing a separator according to any one of Embodiments 1 to 3, wherein the aqueous medium is water or a mixture of water and alcohol.

In embodiment 5, the 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-transporting ability, and mixtures thereof, Which is a production method of a separator.

In Embodiment 6, the inorganic particles having a dielectric constant of 5 or more may be BaTiO ₃ , Pb (Zr, Ti) O ₃ (PZT), Pb _{1 - x} La _x Zr _{1 - y} Ti _y O ₃ PTZ, 0 <x <1, 0 <y <1), Pb (Mg _1/3 Nb _2/3 ) O ₃ -PbTiO ₃ (PMN-PT), Hafnia (HfO ₂ ), SrTiO ₃ , SnO ₂ , (AlO), SiC, and TiO ₂ , and at least one member selected from the group consisting of CeO ₂ , MgO, NiO, CaO, ZnO, ZrO ₂ , SiO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , Inorganic particles, or a mixture of two or more of them.

In the seventh embodiment of the present invention, the inorganic particles having lithium ion transferring capability are lithium phosphate (Li ₃ PO ₄ ), lithium titanium phosphate (LixTiy (PO ₄ ) ₃ , 0 <x <<y<3), lithium aluminum titanium phosphate _{(Li x Al y Ti z (} PO4) 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 Mani help thiophosphate (Li _x Ge _y P _{z S w, 0 <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) series glass and P ₂ S ₅ (Li _x P _y S _z , 0 <y <3, 0 <z <7) series glass, or a mixture of two or more thereof.

In embodiment 8, the water-dispersed binder is selected from the group consisting of styrene-butadiene rubber (SBR) and acrylate-based polymers, One kind or a mixture thereof.

The ninth embodiment is the manufacturing method of the separator according to any one of the first to eighth embodiments, wherein the porous polymer substrate is a porous polymer film base or a porous polymer nonwoven base substrate.

Embodiment 10 is the method of manufacturing a separator according to any one of Embodiments 1 to 9, wherein the porous polymeric film base is a polyolefin-based porous polymeric film base.

Embodiment 11 In embodiment 11, the polyolefin-based porous polymer film base material according to any one of the above-mentioned Embodiments 1 to 10 is a separator formed of at least one polymer selected from the group consisting of polyethylene, polypropylene, polybutylene and polypentene .

Embodiment 12 is the method of manufacturing a separator according to any one of Embodiments 1 to 11, wherein the inorganic particles have an average particle diameter of 0.001 to 10 탆.

Embodiment 13 In Embodiment 13, the porous polymer substrate according to any one of Embodiments 1 to 12 has a thickness of 5 to 50 탆, a pore size and a porosity of 0.01 to 50 탆 and 10 to 95% .

According to another aspect of the present invention, there is provided a separator of the following embodiment.

Example 14 is a separator obtained according to the production method of any one of the above-mentioned Embodiments 1 to 13. [

According to still another aspect of the present invention, there is provided an electrochemical device of the following embodiments.

Embodiment 15 is a cathode, an anode, and the separator of Embodiment 14 interposed between the cathode and the anode.

Embodiment 16 In Embodiment 16, the battery chemistry is an electrochemical device which is a lithium secondary battery.

The present invention is advantageous in that a separator having excellent air permeability and heat resistance characteristics can be manufactured regardless of the radius of gyration of the adsorption-type polymer by controlling the adsorption degree by controlling the pH of the porous coating layer.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description of the invention, It is not interpreted.
1 is a flowchart of a method of manufacturing a separator according to an embodiment of the present invention.
2 is an SEM photograph of the separator produced according to Example 1. Fig.
3 is an SEM photograph of a separator manufactured according to Comparative Example 1. Fig.

Hereinafter, the present invention will be described in detail. Prior to this, terms and words used in the present description and claims should not be construed in a conventional or dictionary sense, and the inventor may appropriately define the concept of a term in order to describe its invention in its best possible way It should be construed as meaning and concept consistent with the technical idea of the present invention. Accordingly, the embodiments shown in the drawings and the drawings are only exemplary embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of filing of the present application, It should be understood that there are numerous equivalents and variations.

FIG. 1 is a flowchart illustrating a method of manufacturing a separator according to an embodiment of the present invention. Referring to FIG. 1, the method for manufacturing a separator of the present invention includes preparing an acidic solution (S100) Forming a coating layer slurry (S300), and coating and drying (S400).

The step of preparing the acidic solution is a step of preparing an acidic solution having a pH of 2 to 4 by mixing the adsorption type polymer and the aqueous medium. This is a step of controlling the adsorption degree irrespective of the radius of gyration of the adsorption type polymer.

Conventionally, there is a problem that the physical properties such as the air permeability of the separator are largely changed after the porous coating layer is formed according to the radius of gyration of the adsorption type polymer. In order to prevent this problem, the radius of gyration of the adsorption- Of the inorganic particles used in the present invention.

However, in the present invention, the adsorption degree of the adsorption type polymer can be controlled by controlling the acidity of the acidic solution within the range of pH 2 to 4. Accordingly, it is possible to produce a separator having a desired level of adsorption regardless of the kind of adsorption type polymer and having a physical property of a certain level or more.

At this time, the acidity of the acidic solution can be appropriately adjusted within the range of pH 2 to 4 depending on the kind and concentration of the adsorption type polymer, the kind of the aqueous medium, temperature, and the like.

As the radius of gyration increases, the amount of polymer that can adsorb to the inorganic material decreases and the steric repulsion is weakened. Therefore, after the slurry is dried, the adsorbed polymer is entangled in the microstructure, so that the physical properties of the separator such as increased air permeability and resistance increase are reduced.

However, when the pH of the slurry is controlled within the above-mentioned range, the ionic strength is increased and the affinity with the inorganic material is increased, thereby increasing the adsorption of the polymer to the inorganic material. As a result, a strong three-dimensional repulsion between the inorganic substances is induced during the drying of the slurry, and a separation membrane coating layer in which inorganic particles are uniformly dispersed can be formed.

The adsorption type polymer can be used without limitation to the radius of gyration if it can control the viscosity while assisting dispersion of the inorganic particles in the porous coating layer slurry. Such adsorptive polymers include, for example, carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, ethylcellulose, polyvinylalcohol, starch starch, starch phosphorus, casein, cyanoethylpolyvinyl alcohol, polyvinylbutyral And the like. These may be used alone or in combination of two or more.

The adsorption type polymer is used in an amount of 0.5 to 5 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of inorganic particles in a conventional coating layer slurry. When the amount is less than the above range, the dispersibility of the slurry may be remarkably lowered, and if it exceeds the above range, the separation membrane resistance after application of the slurry may increase.

The aqueous medium may be water or a mixture of alcohol and water. Examples of the alcohol include methanol, ethanol, propanol, isopropanol, butanol, t-butanol, pentanol, and the like, but the present invention is not limited thereto.

Next, the step of forming a mixed solution is a step of adding inorganic particles to the acidic solution to form a mixed solution.

The inorganic particles may be inorganic particles having a dielectric constant of 5 or more or inorganic particles having lithium ion transferring ability.

Inorganic particles is greater than or equal to the dielectric constant of 5, _{BaTiO 3, Pb (Zr x,} Ti 1-x) O 3 (PZT, 0 <x <1), Pb 1 - x La x Zr 1 - y Ti y O 3 (PLZT , 0 <x <1, 0 <y <1), (1-x) Pb (Mg 1/3 Nb 2/3) O 3 - x PbTiO 3 (PMNPT, 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 , TiO ₂ and SiC, Lt; / RTI &gt;

The 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 <3), 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 Mani help thiophosphate (Li _x (Li _x N _y , 0 < x < 4, 0 < y), Ge _y P _z S _w , 0 <x <4, 0 <y <1, 0 <z <_<2), SiS 2 based _{glass (Li x Si y S z} , 0 <x <3, 0 <y <2, 0 <z <4) and P ₂ S ₅ based glass (Li _x P _y S _z, 0 <x <3, 0 <y <3, 0 <z <7), or a mixture of two or more thereof.

The average particle size of the inorganic particles is not particularly limited, but is preferably in the range of 0.001 to 10 mu m for the formation of the porous coating layer having a uniform thickness and proper porosity. If it is less than 0.001 탆, the dispersibility may be lowered, and if it exceeds 10 탆, the thickness of the formed porous coating layer may increase.

Next, the step of forming the coating layer slurry is a step of forming a coating layer slurry by adding an aqueous dispersion binder to the mixed solution.

At this time, it is preferable to use a polymer having a glass transition temperature (T _g ) of -200 to 200 ° C, which improves the mechanical properties such as flexibility and elasticity of the finally formed porous coating layer I can do it.

The water-dispersed binder does not necessarily have the ion-conducting ability, but the performance of the electrochemical device can be further improved by using a polymer having an ion-conducting ability. Therefore, it is preferable that the water-dispersed binder has a high permittivity constant. Since the dissociation degree of the salt in the electrolyte actually depends on the permittivity constant of the electrolyte solvent, the higher the permittivity constant of the water-dispersed binder, the better the salt dissociation in the electrolyte. The permittivity constant of the water-dispersed binder may be in the range of 1.0 to 100 (measurement frequency = 1 kHz), preferably 10 or more.

Non-limiting examples of such water-dispersed binders include acrylate (acrylate) such as styrene-butadiene rubber (SBR), polyacrylate, polymethyl methacrylate, polymethacrylate, polybutyl acrylate Polyvinylidene fluoride-based, polyvinylidene fluoride-hexafluoropropylene-based, polystyrene-based copolymer, and the like, or a mixture of two or more thereof selected from the group consisting of polyvinylidene fluoride- .

The weight ratio of the inorganic particles to the water-dispersed binder is preferably in the range of, for example, 50:50 to 99: 1, or 60:40 to 99: 1, or 70:30 to 95: 5, or 90:10 to 99 : 1. When the content ratio of the inorganic particles to the binder polymer is less than 50:50, the content of the polymer is increased, and the pore size and porosity of the formed porous coating layer may be reduced. When the content of the inorganic particles is more than 99 parts by weight, the water-dispersible binder content is small, so that the fillability of the formed porous coating layer may be weakened.

Next, in the step of coating and drying, the slurry of the coating layer is applied to the porous substrate and then dried to form a separator having a porous coating layer formed on at least one surface of the porous substrate.

At this time, the method of applying the coating layer slurry to the porous substrate is not particularly limited, but slot coating or dip coating method is preferably used. The slot coating is capable of adjusting the thickness of the porous coating layer according to the flow rate imparted in the metering pump in such a manner that the coating layer slurry supplied through the slot die is applied to the entire surface of the porous substrate. In addition, dip coating is a method of coating a porous substrate in a tank containing a coating layer slurry to control the thickness of the porous coating layer according to the concentration of the coating layer slurry and the speed at which the substrate is taken out from the slurry tank. After immersion, weighing can be done through Meyer bar.

In the step of drying the coated slurry, the aqueous medium remaining in the slurry is removed to form a porous coating layer on both surfaces of the porous substrate.

The porous coating layer prepared by the above-mentioned method can improve the wettability to the porous substrate to improve the connectivity. In the porous coating layer, inorganic particles are charged and bound to each other by the water-dispersed binder in contact with each other, thereby forming an interstitial volume between the inorganic particles, and interstitials between the inorganic particles The volume (interstitial volume) becomes empty space to form pores.

That is, the water-dispersed binder attaches the inorganic particles to each other so that the inorganic particles can remain bonded to each other. For example, the water-dispersed binder bonds and fixes the inorganic particles. In addition, the pores of the porous coating layer are pores formed by interstitial volume between inorganic particles as void spaces, and the pores of the porous coating layer are formed of inorganic materials substantially closed in a packed structure (closed packed or densely packed) It is the space defined by the particles. A path through which lithium ions necessary for operating the battery through the pores of the porous coating layer can be provided.

Examples of the porous polymer substrate include a porous polymer film base and a porous polymer nonwoven base.

As the porous polymer film substrate, a separator made of a porous polymer film made of polyolefin such as polyethylene or polypropylene may be used. Such a polyolefin porous polymer film substrate may have a shutdown function at a temperature of, for example, 80 to 130 ° C Lt; / RTI &gt; Such a polyolefin porous polymer film may be obtained by mixing polyolefin-based polymers such as polyethylene, polypropylene, polybutylene, and polypentene, such as high-density polyethylene, linear low density polyethylene, low density polyethylene and ultra high molecular weight polyethylene, either alone or in combination with two or more thereof And may be formed of a polymer. In addition, the porous polymeric film substrate may be produced by using various polymers such as polyesters in addition to polyolefin. In addition, the porous polymeric film substrate may have a structure in which two or more impregnated layers are laminated, and each of the film layers may be formed of a polymer such as polyolefin, polyester, or the like, .

The porous polymer nonwoven substrate may be made of a polymer using a polymer such as the above-mentioned polyolefin polymer or polyester such as polyethylene terephthalate (PET) having higher heat resistance. The porous polymer nonwoven substrate may be produced by mixing single fibers or two or more kinds of fibers.

The material and shape of the porous polymer film substrate may be variously selected according to the purpose.

The thickness of the porous polymer base material is not particularly limited, but is preferably 1 to 100 탆, more preferably 5 to 50 탆. The pore size and porosity present in the porous polymer base material are also not particularly limited, Mu m and 10 to 95%.

An electrochemical device can be manufactured by laminating a separator manufactured according to the above-described manufacturing method between a cathode and an anode. An electrochemical device includes all devices that perform an electrochemical reaction, and specific examples include capacitors such as all kinds of primary, secondary, fuel cell, solar cell, 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 among the above secondary batteries is preferable.

The cathode and the anode both to be used together with the separator of the present invention are not particularly limited, and the electrode active material may be bound to an electrode current collector according to a conventional method known in the art. Examples of the cathode active material include, but are not limited to, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron oxide, or a combination thereof It is preferable to use a lithium composite oxide. Examples of the anode active material include, but are not limited to, conventional anode compounds that can be used in the anode of conventional electrochemical devices, and particularly lithium metal or lithium alloys, carbon, petroleum coke, activated carbon, Lithium-adsorbing materials such as graphite or other carbon-based materials and the like are preferable. Non-limiting examples of the cathode current collector include aluminum, nickel, or a combination thereof, and examples of the anode current collector include aluminum, nickel, or a combination thereof. And examples of the anode current collector include, but are not limited to, foil made by copper, gold, nickel, or copper alloy or a combination thereof.

The electrolytic solution which can be used in the battery chemical element of the present invention is a salt having a structure such as A ⁺ B ^- , wherein A ⁺ includes ions consisting of alkali metal cations such as Li ⁺ , Na ⁺ , K ^{+ -} it is ^{PF6 -, BF4 -, 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 ₃ ) ₃ ^- , or a salt comprising an ion of a combination of these, may be used in combination with at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate N-methylpyrrolidone (NMP), ethylmethyl carbonate (EMC), gamma-butyrolactone (g), and the like can be used in combination with other solvents such as acetone, methyl ethyl ketone (DMSO), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, -Butyrolactone), or a mixture thereof, but the present invention is not limited thereto.

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.

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 1]

As an adsorption type polymer, an acidic solution having a pH of 3 was prepared using sodium carboxymethyl cellulose (Na-CMC, radius of gyration 100 nm) and water as a water medium. The pH was adjusted using 1 M aqueous HCl solution. Then, alumina (D50 nm) was mixed with the acidic solution as inorganic particles, and the inorganic particles were crushed and dispersed by a ball mill method for 12 hours or longer to prepare a mixed solution. Then, The ratio of alumina: Na-CMC: polymethylmethacrylate in the slurry of the coating layer was 94: 3: 3 (wt) by weight in the slurry of the coating layer. After coating with a doctor blade on a porous membrane (SK innovation, 512GK), the solvents contained in the slurry were dried to prepare a separator having a thickness of 3 μm Joe was.

[Comparative Example 1]

A separator was prepared in the same manner as in Example 1, except that a dispersion solution prepared by mixing sodium carboxymethyl cellulose and deionized water as an adsorption type polymer was used instead of using an acidic solution. The pH of the dispersion solution was 7.

2 and 3 are SEM photographs of a separator manufactured according to Example 1 and Comparative Example 1, respectively. Referring to FIG. 2, Example 1 according to the present invention has a pore- While the comparative example 1 shows that the portion where the pore is blocked by the CMC (indicated by the dotted line) is found.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (16)

Preparing an acidic solution having a pH of 2 to 4 by mixing the adsorptive polymer and the aqueous medium;
Adding inorganic particles to the acidic solution to form a mixed solution;
Adding a water-dispersed binder to the mixed solution to form a coating layer slurry; And
And coating and drying the coating layer slurry on the porous substrate.
The method according to claim 1,
Wherein the coating layer slurry contains 0.5 to 5 parts by weight of an adsorption type polymer based on 100 parts by weight of inorganic particles.
The method according to claim 1,
Wherein the adsorption type polymer is at least one selected from the group consisting of carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, ethylcellulose, polyvinyl alcohol, oxidized starch, phosphorylated starch, casein and salts thereof Way. The method according to claim 1,
Wherein the aqueous medium is water or a mixture of water and alcohol. The method according to claim 1,
Wherein the 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 transporting ability, and mixtures thereof. 6. The method of claim 5,
Inorganic particles is greater than or equal to the dielectric constant of 5, _{BaTiO 3, Pb (Zr, Ti} ) O 3 (PZT), Pb 1 - x La x Zr 1 -y Ti y O 3 (PLZT, 0 <x <1,0 <y _{<1), Pb (Mg 1/3} Nb 2/3) O 3 -PbTiO 3 (PMN-PT), hafnia _{(HfO 2), SrTiO 3,} SnO 2, CeO 2, MgO, NiO, CaO, ZnO, Wherein the inorganic particles are at least one inorganic particle selected from the group consisting of ZrO ₂ , SiO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , boehmite (γ-AlO (OH)), SiC and TiO ₂ , &Lt; / RTI &gt; 6. The method of claim 5,
Inorganic particles having the lithium ion conductivity include lithium phosphate (Li ₃ PO _4), lithium titanium phosphate _{(LixTiy (PO 4) 3,} 0 <x <2, 0 <y <3), lithium aluminum titanium phosphate (Li _{x Al y Ti z (PO4) 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 , (Li _x N _y , 0 <x <4, 0 <y <2), SiS ₂ (Li _x Si _y S _z , 0 <y <1, 0 < _z < x <3, 0 <y <3, 0 <z <7) series glass and P ₂ S ₅ (Li _x P _y S _z , 0 <x < glass, or a mixture of two or more thereof. The method according to claim 1,
Wherein the water-dispersed binder is one selected from the group consisting of styrene-butadiene rubber (SBR), and acrylate-based polymers, or a mixture thereof. The method according to claim 1,
Wherein the porous polymer base material is a porous polymeric film base or a porous polymer nonwoven base base. 10. The method of claim 9,
Wherein the porous polymeric film base is a polyolefin-based porous polymeric film base. 11. The method of claim 10,
Wherein the polyolefin-based porous polymer film base is formed of at least one polymer selected from the group consisting of polyethylene, polypropylene, polybutylene, and polypentene. The method according to claim 1,
Wherein the average particle size of the inorganic particles is 0.001 to 10 占 퐉. The method according to claim 1,
Wherein the porous polymer substrate has a thickness of 5 to 50 탆, a pore size and a porosity of 0.01 to 50 탆 and 10 to 95%, respectively. A separator obtained by the production method of any one of claims 1 to 13. An electrochemical device comprising a cathode, an anode, and a separator interposed between the cathode and the anode. 16. The method of claim 15,
Wherein the battery chemical element is a lithium secondary battery.

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