KR20140055064A - Electrode assembly comprising binder film, and preparation method thereof - Google Patents

Abstract

The present invention relates to an electrode assembly and, more particularly, to an electrode assembly that includes a binder film and a method for preparing the same. According to an aspect of the present invention, provided is an electrode assembly including a first electrode; a binder film that is formed on the first electrode; a porous woven or non-woven separation membrane that is formed on the binder film; a binder film that is formed on the porous woven or non-woven separation membrane; and a second electrode that is formed on the binder film and is opposite to the first electrode. According to another aspect of the present invention, provided is a method for preparing an electrode assembly including a step for forming an aggregate by positioning a first electrode, a binder film, a porous woven or non-woven separation membrane, a binder film, and a second electrode that is opposite to the first electrode in this order; and a step for forming the electrode assembly by compressing the aggregate. According to an aspect of the present invention, an assembling procedure of the electrode assembly is simplified, and thus the time and cost for the preparation are reduced. In addition, the binder film allows the porous woven or non-woven separation membrane and the electrode to be combined with high adhesion ability and high ion conductivity.

Description

[0001] The present invention relates to an electrode assembly comprising a binder film and a preparation method thereof,

The present invention relates to an electrode assembly, and more particularly to an electrode assembly including a binder film and a method of manufacturing the same.

In recent years, attention has been paid to securing safety in the field of electrochemical devices. In particular, a secondary battery such as a lithium secondary battery has an electrode assembly having an anode, a cathode, and a separator. Such an electrode assembly includes a jelly-roll type in which an anode and an anode are roundly wound with a separator interposed therebetween, A stack type in which an anode, a cathode, and a separator are sequentially stacked, and a unit cell composed of an anode, a cathode, and a separator as a mixed type thereof is formed into a continuous folding film A stack-folding type lithium secondary battery having a structure in which it is folded / rolled by using a separator, a separator, and the like. Such a stack-folding type lithium secondary battery is easy to manufacture, has a structure capable of efficiently utilizing space, maximizes the content of electrode active material, and can realize a battery with high integration density.

The separation membrane used in these secondary batteries is a porous separator obtained by taking the form of porous woven fabric or nonwoven fabric, or in the case of a film or membrane form, pores formed by a dry method or a wet method. However, the porous woven fabric or the nonwoven fabric separating membrane is not particularly strong in its woven fabric or nonwoven fabric substrate itself, and the porous woven fabric or nonwoven fabric separating membrane is folded during the manufacturing process when the binder polymer is coated for bonding with the electrode. Or when the tension is applied during the winding process, there is a high possibility of breakage.

Such a porous woven or nonwoven fabric separating membrane is assembled with an electrode to form an electrode assembly or a cell and there is a great risk that the electrode assembly or the battery is separated from each other due to a weak binding force between the porous woven fabric or the non- Further, a negative phenomenon caused by the use of the battery, for example, the volume expansion (swelling) of the electrode active material and the generation of gas due to decomposition of the electrolyte cause or accelerate the separation between the porous woven fabric or the nonwoven fabric separator and the electrode. In these cases, the electrode active material or other particles in the coating layer which are separated in the separation process can act as local defects in the device, and the bonding between the other coating layer and the porous woven fabric or nonwoven fabric separating film can also be released and separated, And so on.

Therefore, a simple manufacturing process for reinforcing the strength and the bonding strength of the separator and the electrode assembly in which the electrode and the separator are combined is still required.

It is an object of the present invention to provide an electrode assembly in which the porous woven fabric or the nonwoven fabric separator and the electrode are strongly coupled with each other while the assembling process is simple.

Other objects and advantages of the present invention will become apparent from the following description. It is also to be easily understood that the objects and advantages of the present invention can be realized by the means or method described in the claims, and the combination thereof.

According to an aspect of the present invention, there is provided a plasma display panel comprising: a first electrode; A binder film formed on the first electrode; A porous woven or nonwoven fabric separating film formed on the binder film; A binder film formed on the porous woven or nonwoven fabric separating film; And a second electrode formed on the binder film, the second electrode being opposite to the first electrode.

According to another aspect of the present invention, there is provided a method for fabricating an electrochemical cell, comprising: forming an aggregate by sequentially positioning a first electrode, a binder film, a porous woven or nonwoven fabric separator, a binder film, and a second electrode opposite to the first electrode; And pressing the aggregate to form an electrode assembly.

According to one embodiment of the present invention, since the assembly procedure of the electrode assembly is simplified, manufacturing time and cost are reduced, and the porous woven fabric or the nonwoven fabric separator and the electrode can be combined with a good bonding force and a high ionic conductivity by the binder film .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and form a part of the specification, illustrate preferred embodiments of the invention and together with the detailed description of the preferred embodiments given below, serve to better understand the spirit and principles of the invention Therefore, the present invention should not be construed as being limited to the matters described in such drawings.
1 is a process flow diagram for manufacturing an electrode assembly according to one embodiment of the present invention.
Fig. 2 schematically shows a wet casting showing an example of a method for producing the binder film of the present invention.
FIG. 3 schematically shows a binder film having various appearance according to one embodiment of the present invention. FIG.
Fig. 4 schematically shows rolling showing an example of a method for forming the electrode assembly of the present invention.
5 is a schematic cross-sectional view of an electrode assembly according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail. Prior to this, 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 designate the concept of a term appropriately in order to describe its own invention in the best way possible. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the constitutions described in the embodiments described in the present specification and shown in the drawings are only examples of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

As used herein, the term " electrode assembly " refers to a single unit cell or an assembled form in which two or more unit cells have a separator interposed therebetween, Refers to an electrode, that is, a positive electrode, a negative electrode, and a unit having a separator interposed between the positive electrode and the negative electrode.

An electrode assembly according to an aspect of the present invention includes a first electrode; A binder film formed on the first electrode; A porous woven or nonwoven fabric separating film formed on the binder film; A binder film formed on the porous woven or nonwoven fabric separating film; And a second electrode formed on the binder film and opposite to the first electrode.

The first electrode used in the present invention may be a positive electrode or a negative electrode, and thus the kind of the electrode active material and the current collector may be different. Once the first electrode is determined to be an anode or a cathode according to an embodiment of the present invention, the second electrode may be defined as a cathode or an anode opposite to the first electrode.

The electrode is not particularly limited, and the electrode active material can be produced in the form bound to the 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 A lithium complex oxide may be used. As a non-limiting example of the negative electrode active material, a conventional negative electrode active material that can be used for a negative electrode of an electrochemical device can be used. In particular, lithium metal or a lithium alloy, carbon, petroleum coke, activated carbon, Lithium adsorbing materials such as graphite or other carbon-based materials and the like can be used. Non-limiting examples of the positive current collector include aluminum, nickel, or a combination thereof. Examples of the negative current collector include copper, gold, nickel, or a copper alloy or a combination thereof Foil to be manufactured, and the like.

The binder film to be used in the present invention may be at least one selected from the group consisting of polyvinylidene fluoride (PVdF), styrene-butadiene rubber (SBR), polytetrafluoroethylene (PTFE), polyethylene glycol (PEG) glycol, polypropylene glycol (PPG), toluene diisocyanate (TDI), polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, poly But are not limited to, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate cellulose acetate propionate, cyanoethylpullulan, But are not limited to, ethylenevinyl alcohol, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, acrylonitrile-styrene-butadiene copolymer (acrylonitrile -styrene-butadiene copolymer) and polyimide.

Non-limiting examples of the polyvinylidene fluoride (PVDF) include polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichlorethylene, polyvinylidene fluoride- Wherein the polymer is selected from the group consisting of tetrafluoroethylene, polyvinylidene fluoride-co-trifluoroethylene, polyvinylidene fluoride-co-trifluorofluoroethylene and polyvinylidene fluoride-co- Or a mixture of two or more thereof.

This binder film is produced in the form of a film or a film. Methods of producing such films include, but are not limited to, wet casting methods such as solvent casting, dry methods such as melt-extrusion without solvent, and the like.

The binder film may have various patterned holes or may have a plurality of band shapes. The area of contact of the binder film with the electrode may be 70% or less, preferably about 50 to about 10% of the area of one surface of the electrode facing the porous woven or nonwoven fabric separator. When the binder film having the patterned appearance is provided in the above-described area range, the ionic conductivity will be greatly improved while at least maintaining the bonding force between the porous woven fabric or the nonwoven fabric separating membrane to be brought into contact with the electrode. The width of the binder film may be greater than the width of the first electrode, the second electrode, or the porous woven or nonwoven fabric separator.

The porous woven or nonwoven fabric separating membrane used in the present invention may be formed of a material selected from the group consisting of polyethylene, polypropylene, polyethyleneterephthalate, polybutyleneterephthalate, polyester, polyacetal, But are not limited to, polyamide, polycarbonate, polyimide, polyetheretherketone, polyaryletherketone, polyetherimide, polyamideimide, polyvinylidene chloride, Selected from the group consisting of polybenzimidazole, polyethersulfone, polyphenylene oxide, cyclic olefin copolymer, polyphenylenesulfide, and polyethylenenaphthalene. Any one of the polymers or these 2 can be a woven or non-woven fabric formed species or more thereof, but are not limited to.

The porous woven or nonwoven fabric separating membrane may further include a porous coating layer. The porous coating layer includes inorganic particles and a binder polymer. The binder polymer is located on a part or all of the inorganic particles, and functions to connect and fix the inorganic particles.

The inorganic particles used in the present invention may be inorganic particles having a dielectric constant of about 5 or more or inorganic particles having a lithium ion transferring ability (in the case of a lithium secondary battery), either singly or in combination. The dielectric constant of about 5 or more inorganic _{particles, 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 (PMN-PT, 0 <x <1), Wherein the metal oxide selected from the group consisting of hafnia (HfO ₂ ), SrTiO ₃ , SnO ₂ , CeO ₂ , MgO, NiO, CaO, ZnO, ZrO ₂ , SiO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , SiC and TiO ₂ Or a mixture of two or more thereof. The inorganic particles having lithium ion transferring ability include, but are not limited to, lithium phosphate (Li ₃ PO ₄ ), lithium titanium phosphate (Li _x Ti _y (PO ₄ ) ₃ , 0 <x < 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 (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 Mani Titanium (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) 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 average particle size of the inorganic particles is not particularly limited, but may range from about 0.001 탆 to about 10 탆 for the formation of a porous coating layer of uniform thickness and proper porosity. When the average particle diameter of the inorganic particles satisfies the above range, the dispersibility of the inorganic particles can be prevented from decreasing, and the porous coating layer can be adjusted to an appropriate thickness.

The binder polymer used in the present invention may be the same or different from the binder film described hereinabove. The binder polymer may be contained in an amount of about 0.1 to about 20 parts by weight, preferably about 1 to about 5 parts by weight, based on 100 parts by weight of the total amount of the binder polymer and the inorganic particles. Non-limiting examples thereof include polyvinylidene fluoride-co-hexafluoro propylene (PVDF-co-HFP), polyvinylidene fluoride-co-trichloroethylene Polyvinylidene fluoride-co-chlorotrifluoroethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, poly (vinylpyrrolidone), polyvinylpyrrolidone, But are not limited to, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate cellulose acetate propionate, cyanoethylpullulan, But are not limited to, polyvinylpyrrolidone, polyvinyl alcohol, cyanoethylpolyvinylalcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxyl methyl cellulose (CMC), acrylonitrile-styrene Acrylonitrile-styrene-butadiene copolymer, polyimide, polyvinylidene fluoride, polyacrylonitrile, and styrene butadiene rubber (SBR). Any one selected or a mixture of two or more thereof.

Then, the binder film and the second electrode are sequentially placed on the porous woven or nonwoven fabric separating film. Here, the binder film may be the same as or different from the binder film described hereinabove, but is preferably the same as the binder film described hereinabove. The second electrode is opposite to the first electrode. The type and content of this second electrode are as described hereinabove.

According to another aspect of the present invention, there is provided an electrochemical device including a positive electrode, a negative electrode, and the above-described separator interposed between the positive electrode and the negative electrode.

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

1 is a process flow diagram for manufacturing an electrode assembly according to one embodiment of the present invention.

Referring to FIG. 1, a method of manufacturing an electrode assembly according to another aspect of the present invention includes a forming step S1 of forming an assembly and a forming step S2 of forming an electrode assembly. The specific process is as follows.

In the step S1, a first electrode including a predetermined electrode active material layer and a current collector is preferentially provided. The first electrode, the electrode active material layer, and the current collector are as previously described for the electrode assembly herein.

Next, a binder film is placed on the first electrode. The binder film is as previously described for electrode assemblies herein.

Fig. 2 schematically shows a wet casting showing an example of a method for producing the binder film of the present invention.

Referring to FIG. 2, a raw material (polymer) of a binder film is dissolved in a solvent to form a liquid binder solution, and the viscosity (fluidity) of the binder solution is adjusted to be suitable for film formation. Next, the binder solution is applied on a support such as a plate, a frame, a cylinder, an endless belt or the like to form a binder layer.

Subsequently, the binder layer is dried to remove the solvent to form a binder film. The solvent-removed binder film is then dried and / or cooled by a drying roll, a cooling roll, And finally peeled off from the support to obtain a binder film.

The thickness of the binder film thus obtained may be from 0.2 to 5 mu m, or from 1 to 3 mu m. When the thickness of the binder film falls within the above-mentioned range, the binder film keeps the bonding force between the porous woven fabric or the nonwoven fabric separating film, which will be in contact with each other, and the electrode at an optimal state. Further, the porous woven or nonwoven fabric separator and the pores of the electrode (active material layer) are not clogged with each other so that the binder film can function as an ion passage between the porous woven fabric or the nonwoven fabric separator and the electrode as a binder layer Respectively.

In addition, the binder film may have an appearance with various patterned holes.

FIG. 3 schematically shows a binder film having various appearance according to one embodiment of the present invention. FIG. Referring to FIG. 3, a shape having various patterned holes such as a circle, an ellipse, and a polygon, for example, a dot (FIG. 3A), a grid (FIG. 3B), a mesh 3c) may be used. Such holes may be produced, for example, by a pattern of the support or its surface in the process of forming the binder film described above (see, for example, Fig. 2), or by a perforation process using a perforating means having a desired pattern after film formation .

However, the holes formed in the binder film may be arranged regularly or randomly with respect to each other, but the holes in the binder film having the patterned holes may have fewer or no holes at all (See FIG. 3). It is preferable to pattern (puncture) the binder film so that the binder film is not cut or broken by a force such as a tensile force which can be applied to the manufacturing process. The distribution of the holes in such a binder film should be determined at the level of the edge of the binder film in order to maximize the bond strength and ionic conductivity of the final binder film without causing manufacturing problems.

Also, for the reasons stated above, the width of the binder film may be longer than the width of the components that are in contact with it, i.e., the first electrode, the second electrode, or the porous woven or nonwoven separator. Such an unnecessary portion longer than the width of the electrode and the separation membrane can be removed in a process such as compression or any subsequent process.

In addition, the binder film may be provided in the form of strips on the same plane. The band-shaped binder film is provided on the electrode or the separating film while maintaining a constant interval, so that a binder-free region is formed at a predetermined interval when the electrode or separating film is brought into contact with the electrode or separating film. Accordingly, such a binder-free region will be similar in terms of the area formed when the binder film having the hole is bonded to the electrode or the separation membrane and the area in which the binder is partially applied to the electrode or the separation membrane.

The area of the above-described patterned pores or the band-shaped binder film may be about 70% or less, preferably about 50 to about 10% of the total area of contact with the porous woven fabric or nonwoven fabric separating membrane and the electrode. When the binder film having the patterned appearance is provided in the above-described area range, the ionic conductivity will be greatly improved while at least maintaining the bonding force between the porous woven fabric or the nonwoven fabric separating membrane to be brought into contact with the electrode.

Then, the porous woven fabric or the nonwoven fabric separating film is placed on the thus formed binder film. The porous woven or nonwoven fabric separating membrane of the electrochemical device has a pore as a porous base material. The porous woven or nonwoven fabric separating membrane has a plurality of pores so as to have a desired porosity and air permeability. These pores serve as basically the path of ions in the cell, but when the temperature rises above a certain range due to external factors or internal factors such as short circuit, the inside of the pores forming the membrane is melted and collapsed, (Shutdown) by preventing the temperature of the battery from further rising.

The porous woven or nonwoven fabric separating membrane used in the present invention is as described above for the electrode assembly herein. The thickness of the porous woven or nonwoven fabric separating membrane is not particularly limited, but is about 1 탆 to about 100 탆 or about 5 탆 to about 50 탆. The size and porosity of the pores present in the porous woven or nonwoven fabric separation membrane are also not particularly limited, but may be about 0.001 μm to about 50 μm and about 10% to about 95%, respectively.

The porous woven or nonwoven fabric separating membrane may further include a porous coating layer. The porous coating layer includes inorganic particles and a binder polymer. The inorganic particles and the binder polymer are as described above for the electrode assembly herein.

The step of forming the porous coating layer is formed by dispersing inorganic particles in a binder solution of a binder polymer and a solvent to prepare a slurry, coating the slurry on a porous substrate, and removing the solvent . As the coating method, a conventional method can be used, and various methods such as dip coating, die coating, roll coating, comma coating, or a mixing method thereof can be used.

The solvent is similar in solubility index to the binder polymer to be used, and preferably has a low boiling point. This is because the mixing can be made uniform and then the solvent can be easily removed. Non-limiting examples of the solvent include acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methyl-2-pyrrolidone (N- methyl-2-pyrrolidone, NMP), cyclohexane, water or mixtures thereof.

Then, the binder film and the second electrode are placed on the porous woven or nonwoven fabric separating film. This binder film and the second electrode are as described above for the electrode assembly herein.

According to another aspect of the present invention, the above-described aggregate may be placed in batch mode or simultaneously in the above-mentioned first electrode, the binder film, the porous woven or nonwoven fabric separator, the binder film and the second electrode.

For example, in order to position them sequentially, the first electrode is firstly positioned, and then the remaining binder film, porous woven fabric or nonwoven fabric separating film, binder film, and binder resin are transferred through transfer means such as roll, belt, Two electrodes can be achieved by sequentially transferring them one by one in order. In the case of the batch type, it can be achieved by bundling and transferring two or more of the first electrode, the binder film, the porous woven fabric or the nonwoven fabric separating film, the binder film and the second electrode through the transfer means such as a roll or a belt in the above- There will be. A binder film, a porous woven fabric or a nonwoven fabric separator, a binder film and a second electrode through a transfer means such as a roll, a belt, or the like at the same time.

In step S2, the assembly formed in step S1 is compressed to form an electrode assembly.

Fig. 4 schematically shows rolling showing an example of a method for forming the electrode assembly of the present invention. 4, the first electrode 1, the binder film 2, the porous woven or nonwoven fabric separating film 3, the binder film 4, and the second electrode 4 are simultaneously bonded to each other. (5) are arranged in this order is carried out through a compression step using two or more opposing rotating rolls. The pressing step may be performed by hot rolling, cold rolling, or a combination thereof.

Hot rolling is a method of rolling by passing between two rotary rolls at a temperature higher than the recrystallization temperature of the object, and the hot rolling roll to be used requires rolling the object at a temperature of about 1/2 of the melting point (absolute temperature) It is advantageous for processing. Hot rolling also has the advantage that the rolling power can be small and large deformation can be easily induced. Therefore, the temperature of the hot rolling and the rotational speed of the roll, etc. can be adjusted according to the state of the object, that is, the aggregate of the present invention.

The cold rolling is a method of rolling by using a roll having a temperature not higher than the recrystallization temperature of the object, and the cold rolling roll used does not need to be different from the hot rolling roll in particular, so that the hot rolling or cold rolling Can be used as a roll. The surface state of the roll can be reflected to the object as it is without any bending of the surface of the object. Therefore, in cold rolling, it is possible to calibrate defects due to irregularities, wrinkles, scratches, etc. on the surface of an object (e.g., an aggregate) that may occur in hot rolling, to thin the thickness of the object, And an object (for example, an electrode assembly) having a largely smooth surface can be obtained depending on the surface of the cold-rolling roll to be used.

Also, the pressing step is carried out under a temperature and a pressure at which the binding force of the object to be contacted with the binder film (i.e., the electrode and the separation membrane) can be maximally expressed, preferably the temperature is about 80 to about 150 DEG C, Or from about 90 to about 110 DEG C and the pressure may be from about 50 to about 200 kgf, or from about 130 to about 180 kgf. When the binder film is squeezed between the electrode and the separator at a temperature and a pressure within the above range, the bonding force of the electrode assembly is greatly increased. Such high cohesive force can be obtained by maintaining the excellent air permeability of the separator and the thinness of the binder film, Thereby contributing greatly to improvement in durability. Further, in the pressing step, the advantages of the hot rolling and the cold rolling can be utilized as much as possible and combined with each other.

According to the present invention, when the binder film is applied between the electrode and the separator, the binding force between the electrode and the separator in the electrode assembly is large and the inherent function of the binder film, such as the inherent binding force of the binder film, The packing of the inorganic particles in the selective coating layer and minimization of the failure due to the short-circuiting due to the uncoated region of the coating layer are maintained and improved, thereby minimizing the defect rate due to the delamination while maximizing the performance of the battery.

According to another aspect of the present invention, there is provided an electrode assembly manufactured by the above-described method of manufacturing an electrode assembly.

5 is a schematic cross-sectional view of an electrode assembly according to an embodiment of the present invention. 5, a first electrode 1, a binder film 2, a porous woven or nonwoven fabric separator 3, a binder film 4, and a second electrode 5 opposite to the first electrode And the first electrode 1 and the porous woven fabric or nonwoven fabric separating film 3 are bonded by the binder film 2 and the second electrode 5 and the porous woven or nonwoven fabric separating film 3 are bonded by the binder film 4, 3).

In addition, the porous woven fabric or nonwoven fabric separating membrane may further comprise a porous coating layer. 5, the porous woven or non-woven fabric separating film 3 may further include a porous coating layer (not shown). In this case, the binder film 2 may be a porous woven fabric or a porous woven fabric A porous coating layer (not shown) of the nonwoven fabric separator 3 is bonded to the first electrode 1 and a porous coating layer (not shown) of the porous woven fabric or nonwoven fabric separator 3 is bonded to the first electrode 1 by the binder film 4 And is coupled with the second electrode 5.

Details of the electrodes, the binder film, the porous woven fabric or the nonwoven fabric separator (base material), the selective porous coating layer, etc. constituting the electrode assembly of the present invention are as described in the description of the method of manufacturing the electrode assembly hereinabove.

Claims (24)

A first electrode;
A binder film formed on the first electrode;
A porous woven or nonwoven fabric separating film formed on the binder film;
A binder film formed on the porous woven or nonwoven fabric separating film; And
And a second electrode formed on the binder film and opposite to the first electrode. The method according to claim 1,
Wherein the binder film has a plurality of patterned holes or has a plurality of band shapes. The method according to claim 1,
Wherein the area of contact of the binder film with the electrode is 70% or less of the area of one surface of the electrode facing the porous woven fabric or nonwoven fabric separator. The method according to claim 1,
Wherein the width of the binder film is longer than the width of the first electrode, the second electrode, or the porous woven or nonwoven fabric separator. The method according to claim 1,
Wherein the binder film is at least one selected from the group consisting of polyvinylidene fluoride (PVdF), styrene-butadiene rubber (SBR), polytetrafluoroethylene (PTFE), polyethylene glycol (PEG) Polypropylene glycol (PPG), toluene diisocyanate (TDI), polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate ), Polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate ), Cyanoethylpullulan, cyanoethylpolyvinyl But are not limited to, alcohols such as cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, acrylonitrile-styrene-butadiene copolymer, butadiene copolymer, polyimide, and mixtures thereof. The method according to claim 1,
The porous woven or nonwoven fabric separating membrane may be formed of a material selected from the group consisting of polyethylene, polypropylene, polyethyleneterephthalate, polybutyleneterephthalate, polyester, polyacetal, polyamide ), Polycarbonate, polyimide, polyetheretherketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, and the like. ), A polymer selected from the group consisting of polyethersulfone, polyphenylene oxide, cyclic olefin copolymer, polyphenylenesulfide, and polyethylenenaphthalene. Or two or more of these An electrode assembly, characterized in that the woven or non-woven fabric formed of the compound. The method according to claim 1,
Wherein the porous woven or nonwoven fabric separating membrane further comprises a porous coating layer including inorganic particles and a binder polymer. 8. The method of claim 7,
Wherein the inorganic particles are selected from the group consisting of inorganic particles having a dielectric constant of 5 or more, inorganic particles having lithium ion transferring ability, and mixtures thereof. 8. The method of claim 7,
Wherein the binder polymer is selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-co-HFP), polyvinylidene fluoride-co-trichloroethylene, Polyvinylidene fluoride-co-chlorotrifluoroethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyvinyl pyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, propionate, cyanoethylpullulan, But are not limited to, polyvinylpyrrolidone, polyvinyl alcohol, cyanoethylpolyvinylalcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxyl methyl cellulose (CMC), acrylonitrile-styrene Acrylonitrile-styrene-butadiene copolymer, polyimide, polyvinylidene fluoride, polyacrylonitrile, and styrene butadiene rubber (SBR). Or a mixture of two or more thereof. An electrochemical device comprising at least one electrode assembly according to any one of claims 1 to 9. 11. The method of claim 10,
Wherein the electrochemical device is a lithium secondary battery. Forming an aggregate by sequentially positioning a first electrode, a binder film, a porous woven or nonwoven fabric separator, a binder film, and a second electrode opposite to the first electrode; And
And pressing the aggregate to form an electrode assembly
Wherein the electrode assembly includes a first electrode and a second electrode. 13. The method of claim 12,
Wherein the formation of the aggregate is carried out sequentially, batchwise or simultaneously. 13. The method of claim 12,
Wherein the pressing is performed by hot rolling, cold rolling or a combination thereof. 13. The method of claim 12,
Wherein the thickness of the binder film is 0.2 to 5 占 퐉. 13. The method of claim 12,
Wherein the binder film has a plurality of patterned holes or is provided in the form of a plurality of strips. 13. The method of claim 12,
Wherein the area of contact of the binder film with the electrode is 70% or less of the area of one surface of the electrode facing the porous woven fabric or nonwoven fabric separator. 13. The method of claim 12,
Wherein the width of the binder film is longer than the width of the first electrode, the second electrode, or the porous woven or nonwoven fabric separator. 13. The method of claim 12,
Wherein the binder film is at least one selected from the group consisting of polyvinylidene fluoride (PVdF), styrene-butadiene rubber (SBR), polytetrafluoroethylene (PTFE), polyethylene glycol (PEG) Polypropylene glycol (PPG), toluene diisocyanate (TDI), polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate ), Polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate ), Cyanoethylpullulan, cyanoethylpolyvinyl But are not limited to, alcohols such as cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, acrylonitrile-styrene-butadiene copolymer, butadiene copolymer, and polyimide. 2. The method of claim 1, 13. The method of claim 12,
The porous woven or nonwoven fabric separating membrane may be formed of a material selected from the group consisting of polyethylene, polypropylene, polyethyleneterephthalate, polybutyleneterephthalate, polyester, polyacetal, polyamide ), Polycarbonate, polyimide, polyetheretherketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, and the like. ), A polymer selected from the group consisting of polyethersulfone, polyphenylene oxide, cyclic olefin copolymer, polyphenylenesulfide, and polyethylenenaphthalene. Or two or more of these Method for manufacturing an electrode assembly, characterized in that the woven or non-woven fabric formed of the compound. 13. The method of claim 12,
Wherein the porous woven or nonwoven fabric separating membrane further comprises a porous coating layer comprising inorganic particles and a binder polymer. 22. The method of claim 21,
Wherein the inorganic particles are selected from the group consisting of inorganic particles having a dielectric constant of 5 or more, inorganic particles having lithium ion transferring ability, and mixtures thereof. 22. The method of claim 21,
Wherein the binder polymer is selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-co-HFP), polyvinylidene fluoride-co-trichloroethylene, Polyvinylidene fluoride-co-chlorotrifluoroethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyvinyl pyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, propionate, cyanoethylpullulan, But are not limited to, polyvinylpyrrolidone, polyvinyl alcohol, cyanoethylpolyvinylalcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxyl methyl cellulose (CMC), acrylonitrile-styrene Acrylonitrile-styrene-butadiene copolymer, polyimide, polyvinylidene fluoride, polyacrylonitrile, and styrene butadiene rubber (SBR). Or a mixture of two or more thereof. An electrode assembly produced by the method of manufacturing an electrode assembly of any one of claims 12 to 23.

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