KR101636393B1 - Substrate of electrochemical device with improved gas-out property, manufacturing method thereof and electrochemical device including the same - Google Patents

Abstract

The present invention relates to a substrate for an electrochemical device having improved gas dischargeability, a method of manufacturing the same, and an electrochemical device including the same, and more particularly, to a substrate for a planar electrochemical device; Porous coating layers coated on at least one side of the base material for planar electrochemical devices, spaced apart from each other in the longitudinal direction, and including inorganic particles and a polymeric binder; And a gas flow path positioned between the spaced-apart porous coating layers. The present invention relates to a substrate for an improved electrochemical device, a method for manufacturing the same, and an electrochemical device including the same.
According to the present invention, thermal shrinkage does not occur even when the electrochemical device is stored at a high temperature, and internal short-circuiting between the cathode and the anode can be prevented, and mechanical properties and ion conductivity can be improved, And it is possible to easily discharge the side reaction gas generated in the inside when the electrochemical device is driven, thereby improving the safety of the electrochemical device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate for an electrochemical device having improved gas discharge properties, a method for manufacturing the same, and an electrochemical device including the same,

The present invention relates to a substrate for an electrochemical device having improved gas dischargeability, a method of manufacturing the same, and an electrochemical device including the same, and more particularly, To a substrate for an electrochemical device having improved gas dischargeability, a method for producing the same, and an electrochemical device including the same.

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 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 an electrochemical device, when the electrochemical device is overheated and thermal runaway occurs, there is a high possibility that the electrochemical device will cause an explosion. Particularly, a polyolefin-based porous substrate commonly 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 . ≪ / RTI >

In addition, when the electrochemical device is driven, the side reaction gas generated by the anode, the side reaction gas generated by the moisture, and the like can not be smoothly discharged, the explosion may occur due to the ignition of the spark that may occur in the electrochemical device have. The side reaction gas causes the interface with the cathode to be excited, which acts as a resistance in the electrochemical device. As a result, the potential of the anode is lowered to 0 V (Li / Li < + >) or less, and lithium is precipitated on the surface of the anode, thereby causing a short circuit of the electrochemical device.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a substrate for an electrochemical device, which is capable of easily discharging a gas generated therein during operation of the electrochemical device, and a method for producing the same, Device.

According to an aspect of the present invention, there is provided a planar electrochemical device comprising: a substrate; Porous coating layers coated on at least one side of the base material for planar electrochemical devices, spaced apart from each other in the longitudinal direction, and including inorganic particles and a polymeric binder; And a gas flow channel positioned between the spaced-apart porous coating layers. The substrate for an electrochemical device having improved gas dischargeability is provided.

Here, the porous coating layers may be applied in a continuous pattern or in an intermittent pattern.

At this time, the porous coating layers applied in the intermittent pattern may be polygonal, circular or elliptic.

The thickness of the porous coating layer may be 0.01 to 50 탆.

Further, the width of the gas flow path may be from 1 m to 1,000 m.

The inorganic particles may be inorganic particles having a dielectric constant of 5 or more, inorganic particles having lithium ion transporting ability, or a mixture thereof.

The inorganic particles having a dielectric constant of 5 or more may be selected from the group consisting of SrTiO ₃ , SnO ₂ , CeO ₂ , MgO, NiO, CaO, ZnO, ZrO ₂ , SiO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , AlOOH, _{) 3, TiO 2, SiC,} BaTiO 3, Pb (Zr x, Ti 1 -x) O 3 (PZT, where, 0 <x <1 _{Im), 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 &Lt; 1) and HfO ₂ , 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 polymer binder may be at least one selected from the group consisting of polyvinylidene fluoride (PVDF), hexafluoro propylene (HFP), polyvinylidene fluoride-co- hexafluoro propylene, polyvinylidene fluoride-co-trichlorethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, But are not limited to, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate cellulose acetate propionate, cyanoethylpullulane, an anion selected from the group consisting of cyanoethylpolyvinyl alcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, acrylonitrile styrene butadiene Acrylonitrile-styrene-butadiene copolymer and polyimide, or a mixture of two or more thereof.

On the other hand, the planar substrate for an electrochemical device may be a separator, a cathode, or an anode.

At this time, the separator may be formed of a material selected from the group consisting of polyethylene, polypropylene, polybutylene, polypentene, polyethylene terephthalate, polybutylene terephthalate, polyesters, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide ), Polyphenylene sulfide, and polyethylene naphthalene, or a mixture of two or more thereof.

The cathode includes a flat cathode current collector; And a cathode active material layer formed on at least one surface of the cathode current collector.

The anode includes a planar anode current collector; And an anode active material layer formed on at least one surface of the anode current collector.

According to another aspect of the present invention, there is provided a method of manufacturing an electrochemical device, And applying a porous coating layer on at least one side of the substrate for the electrochemical device, the porous coating layer being applied to the electrochemical device in a longitudinal direction with the porous coating layers being spaced apart from each other.

Here, the applying of the porous coating layer may be performed using a slot-die coating apparatus including jetting openings spaced apart from each other.

According to another aspect of the present invention, there is provided an electrochemical device comprising a substrate for an electrochemical device, wherein the substrate for the electrochemical device is a substrate for an electrochemical device having improved gas- Device is provided.

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

According to an embodiment of the present invention, since at least one surface of the substrate for an electrochemical device includes porous coating layers containing inorganic particles, heat shrinkage does not occur even at high temperature storage, and internal shorting of the cathode and the anode is prevented .

Moreover, the mechanical properties and the ionic conductivity are excellent, so that the performance of the electrochemical device can be improved.

Further, since the side reaction gas generated in the inside of the electrochemical device can be easily discharged during the operation of the electrochemical device, it is possible to prevent the rise of resistance inside the electrochemical device and prevent lithium from precipitating on the surface of the anode, The explosion of the electrochemical device can be prevented.

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 given above, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
1 is a perspective view schematically showing a substrate for an electrochemical device according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a cross section of a substrate for an electrochemical device according to an embodiment of the present invention.
3 is a cross-sectional view schematically showing a cross section of a substrate for an electrochemical device according to another embodiment of the present invention.
4 is a cross-sectional view schematically showing a cross section of a substrate for an electrochemical device according to another embodiment of the present invention.
5 is a perspective view schematically showing a substrate for an electrochemical device according to another embodiment of the present invention.
6 is a schematic view showing a state in which a porous coating layer is applied as a manufacturing method of the present invention.
7 is a cross-sectional view schematically showing a cross section of an electrode assembly constituting an electrochemical device according to an embodiment of the present invention.
8 is a cross-sectional view schematically showing a cross section of an electrode assembly constituting an electrochemical device according to another embodiment of the present invention.
9 is a cross-sectional view schematically showing a cross section of an electrode assembly constituting an electrochemical device according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. 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 embodiments described in the present specification and the constitutions described in the drawings 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, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a perspective view schematically showing a substrate for an electrochemical device according to an embodiment of the present invention, and FIGS. 2 to 4 are cross-sectional views schematically showing a cross section of a substrate for an electrochemical device according to an embodiment of the present invention And FIG. 5 is a perspective view schematically showing a substrate for an electrochemical device according to another embodiment of the present invention.

Referring to FIGS. 1 to 5, an electrochemical device substrate 100, 101, 102, and 103 having improved gas evacuation properties according to an aspect of the present invention includes: a substrate 10 for a planar electrochemical device; And porous coating layers (20) on at least one side of the substrate (10) for planar electrochemical devices, the porous coating layers (20) being spaced apart from each other and longitudinally coated, the inorganic coating layers comprising inorganic particles and a polymeric binder; And a gas flow path (30) located between the spaced-apart porous coating layers (20).

At this time, the plurality of porous coating layers 20 spaced apart from each other and coated in the longitudinal direction may be formed on only one side of the substrate 10 for the electrochemical device on the plane, but may be formed on both sides. The plurality of porous coating layers 20 are formed on one surface of the planar electrochemical device substrate 10 and the planar surface of the electrochemical device substrate 10 is coated with a planar The porous coating layer 21 may be formed.

Here, the porous coating layers 21 may be applied in a continuous pattern in the longitudinal direction, as shown in FIG. 1, but may be applied in an intermittent pattern as shown in FIG. When the gas flow path 30 is applied in such an intermittent pattern, the gas flow path 30 is formed to face all directions, whereby the gases generated in the electrochemical device can be discharged more effectively.

At this time, the porous coating layers applied in the intermittent pattern may be polygonal, circular or elliptical. Here, the polygon may be a polygon such as a triangle, a rectangle, a pentagon, a hexagon, etc., and the circle may be a circle having a perfectly symmetrical shape as well as an asymmetric circle.

Here, the inorganic particles in the porous coating layers 20 applied to the substrate 10 for the electrochemical device on the plane serve as a kind of spacer capable of maintaining the physical form of the porous coating layer, The separator made of the porous substrate is prevented from being thermally shrunk, and even if the separator is damaged, the cathode and the anode are prevented from coming into direct contact with each other, thereby preventing the internal short circuit.

Further, a side reaction gas may be generated during the formation process, the aging process, or the operation of the electrochemical device of the electrochemical device. When the substrate for an electrochemical device in which the gas flow path according to the present invention is formed is used, Thereby effectively discharging the side reaction gas generated through the flow path. This prevents ignition of sparks which may occur inside the electrochemical device, thereby preventing explosion of the electrochemical device.

On the other hand, the side reaction gas increases the resistance between the cathode and the anode interface and causes uneven charging of the anode surface. By using the substrate for an electrochemical device in which the gas flow path according to the present invention is formed, It is possible to suppress the rise of resistance in the electrochemical device, to eliminate charging unevenness, to prevent lithium precipitation on the surface of the anode, and to prevent the lifetime of the electrochemical device from lowering.

At this time, the thickness of the porous coating layer 20 is not particularly limited, but may be 0.01 탆 to 50 탆, or 0.5 탆 to 10 탆 in order to efficiently discharge the side reaction gas generated in the electrochemical device.

The width of the gas flow path may be 1 탆 to 1,000 탆, or 50 탆 to 500 탆. When the above range is satisfied, the side reaction gas generated inside can be efficiently discharged, and the substrate for electrochemical device can be prevented from shrinking, thereby preventing internal short circuit.

On the other hand, when the base for the electrochemical device is a separator, when the width of the gas flow path on the surface of the separator in contact with the cathode exceeds 1 mm, an excessive capacity decrease occurs and the width of the gas flow path on the surface of the separator, mm, the lithium ions of the cathode do not reach the anode smoothly, and the resistance of the battery may become large.

In general, the width of the separator is designed to be about 2,000 mu m to 5,000 mu m larger than the width of the anode. Therefore, when the width of the gas flow path of the separator is greater than 1,000 mu m, the gas flow path not coated with the porous coating layer on the separator shrinks or melts at a relatively low temperature when exposed to a high temperature, . Therefore, in order to prevent such a short circuit, it is desirable to design it to have a width of at least 1,000 mu m or less.

The inorganic particles usable in the present invention are not particularly limited as long as they are electrochemically stable. That is, the inorganic particles usable in the present invention are not particularly limited as long as oxidation and / or reduction reaction does not occur in the operating voltage range of the applied electrochemical device (for example, 0 to 5 V based on Li / Li ⁺ ). 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. Inorganic particles than the dielectric constant. _{5, SrTiO 3, SnO 2, CeO} 2, MgO, NiO, CaO, ZnO, ZrO 2, SiO 2, Y 2 O 3, Al 2 O 3, AlOOH, Al (OH) 3, _{TiO 2, SiC, BaTiO 3,} Pb (Zr x, Ti 1 -x) O 3 (PZT, where, 0 <x <1 _{Im), 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 ) And HfO 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), (LiAlTiP) _x O _y series glass , 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 (Li _x N _y , 0 <x <4, 0 <y <2), SiS ₂ (Li _x N _y , 0 <x <4, 0 <y <1, 0 <z < _{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 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 polymer binder may be at least one selected from the group consisting of polyvinylidene fluoride (PVDF), hexafluoro propylene (HFP), polyvinylidene fluoride-co- hexafluoro propylene, polyvinylidene fluoride-co-trichlorethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, But are not limited to, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate cellulose acetate propionate, cyanoethylpullulane, an anion selected from the group consisting of cyanoethylpolyvinyl alcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, acrylonitrile styrene butadiene Acrylonitrile-styrene-butadiene copolymer, polyimide, or a mixture of two or more thereof. However, the present invention is not limited thereto.

The content of the polymeric binder may be 2 to 30 parts by weight, or 5 to 15 parts by weight based on 100 parts by weight of the inorganic particles. When the content of the polymeric binder satisfies the above range, it is possible to appropriately prevent the inorganic particles from desorbing, prevent an increase in the internal resistance of the electrochemical device, and maintain proper porosity of the porous coating layer.

In the porous coating layer, the polymer binder is coated on a part or the entire surface of the inorganic particles, and the inorganic particles are connected and fixed to each other by the binder polymer in a closely adhered state, It is preferable that the pores are formed. That is, the inorganic particles of the porous coating layer exist in close contact with each other, and the void space generated when the inorganic particles are in close contact becomes the pores of the porous coating layer. The size of the void space present between the inorganic particles is preferably equal to or smaller than the average particle size of the inorganic particles.

On the other hand, the planar substrate for an electrochemical device may be a separator, a cathode, or an anode.

Here, the separator may be formed of a porous substrate. The porous substrate may be any porous substrate commonly used in an electrochemical device. For example, a polyolefin porous membrane or a nonwoven fabric may be used. , And is not particularly limited thereto.

Examples of the polyolefin-based porous film include 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, One membrane can be mentioned.

The nonwoven fabric may include, in addition to the polyolefin nonwoven fabric, for example, polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate ), Polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide, polyphenylenesulfide, and polyethylene naphthalene, which may be used alone or in combination, And nonwoven fabrics formed by mixing these polymers. The structure of the nonwoven fabric may be a spun bond nonwoven fabric or a meltblown nonwoven fabric composed of long fibers.

The thickness of the porous substrate is not particularly limited, but is 1 탆 to 100 탆, or 5 탆 to 50 탆.

The size and porosity of the pores existing in the porous substrate are also not particularly limited, but may be 0.001 탆 to 50 탆 and 10% to 95%, respectively.

The cathode includes a flat cathode current collector; And a cathode active material layer formed on at least one side of the cathode current collector, wherein the anode includes: a planar anode current collector; And an anode active material layer formed on at least one surface of the anode current collector.

As a non-limiting example of the cathode active material, a conventional cathode active material that can be used for a cathode of a conventional electrochemical device can be used. In particular, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron oxide, Oxides can be used. As a non-limiting example of the anode active material, a conventional anode active material that can be used for an anode of an electrochemical device can be used. In particular, lithium metal or a lithium alloy, carbon, petroleum coke, activated carbon ), Graphite or other carbon-based materials, and the like. 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 and so on.

A method of manufacturing a substrate for an electrochemical device having a gas flow path according to the present invention is as follows.

First, a substrate for an electrochemical device is prepared. As described above, the substrate for an electrochemical device which can be used here may be the same as a separator, a cathode or an anode made of a porous substrate.

Subsequently, on at least one surface of the substrate for electrochemical devices, the porous coating layers are applied to each other in the longitudinal direction.

6 is a schematic view showing a state in which a porous coating layer is applied as a manufacturing method of the present invention.

6, a slot-die coating apparatus 40 including a plurality of ejection openings 41 is disposed on an upper surface of a substrate 10 for a planar electrochemical device, and the plurality of ejection openings 41 ) Spaced apart from each other at regular intervals.

The substrate 10 for an electrochemical device is fixed and may be continuously or intermittently applied while the slot-die applying device 40 is moved directly in one direction of the substrate for an electrochemical device, The substrate 40 for the electrochemical device may be continuously or intermittently applied while the substrate 10 for the electrochemical device moves directly in either direction and the substrate 10 for electrochemical devices They may be continuously or intermittently applied while moving in opposite directions to each other.

Here, the predetermined gap corresponds to the width of the gas flow path 30 formed between the porous coating layers 20 to be formed later.

According to another aspect of the present invention, there is provided an electrochemical device comprising a substrate for an electrochemical device, wherein the substrate for electrochemical devices is a substrate for an electrochemical device having improved gas- A chemical device is provided.

7 to 9 are sectional views schematically showing cross sections of an electrode assembly constituting an electrochemical device according to an embodiment of the present invention. In this case, a base for an electrochemical device having improved gas discharge properties is described. Respectively.

The electrochemical device includes an electrode assembly 200, 201, 202 including a cathode 12, an anode 13, a separator 11 interposed between the cathode 12 and the anode 13, Non-aqueous electrolytic solution.

The porous coating layers 20 spaced apart from each other and coated in the longitudinal direction may be applied to both surfaces of the separator 11 but may be formed only on the surface in contact with the cathode 12, A coating layer 21 may be formed on the anode 13 and a planar porous coating layer 21 may be formed on a surface contacting the anode 13 and a surface contacting the cathode 12.

Meanwhile, 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, 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 is preferable.

The electrolyte salt included in the nonaqueous electrolyte solution which can be used in the present invention is a lithium salt. The lithium salt can be used without limitation as those conventionally used in an electrolyte for a lithium secondary battery. For example is the above lithium salt anion ^{F -, Cl -, Br -} , I -, NO 3 -, N (CN) 2 -, BF 4 -, ClO 4 -, PF 6 -, (CF 3) 2 PF _{^{4 -, (CF 3) 3}} PF 3 -, (CF 3) 4 PF 2 -, (CF 3) 5 PF -, (CF 3) 6 P -, CF 3 SO 3 -, CF 3 CF 2 SO 3 - _{, (CF 3 SO 2) 2} N -, (FSO 2) 2 N -, CF 3 CF 2 (CF 3) 2 CO -, (CF 3 SO 2) 2 CH -, (SF 5) 3 C -, ( CF ₃ SO ₂ ) ₃ C ^- , CF ₃ (CF ₂ ) ₇ SO ₃ ^- , CF ₃ CO ₂ ^- , CH ₃ CO ₂ ^- SCN ^- and (CF ₃ CF ₂ SO ₂ ) ₂ N ^- .

Examples of the organic solvent included in the above-mentioned non-aqueous electrolyte include those commonly used in electrolytic solutions for lithium secondary batteries, such as ether, ester, amide, linear carbonate, cyclic carbonate, etc., Can be mixed and used.

Among them, a carbonate compound which is typically a cyclic carbonate, a linear carbonate, or a mixture thereof may be included.

Specific examples of the cyclic carbonate compound include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, Propylene carbonate, 2,3-pentylene carbonate, vinylene carbonate, vinylethylene carbonate, and halides thereof, or a mixture of two or more thereof. Examples of such halides include, but are not limited to, fluoroethylene carbonate (FEC) and the like.

Specific examples of the linear carbonate compound include any one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethyl methyl carbonate (EMC), methyl propyl carbonate and ethyl propyl carbonate And mixtures of two or more of them may be used as typical examples, but the present invention is not limited thereto.

In particular, ethylene carbonate and propylene carbonate, which are cyclic carbonates in the carbonate-based organic solvent, are high-viscosity organic solvents having a high dielectric constant and can dissociate the lithium salt in the electrolyte more easily. In addition, such cyclic carbonates can be used as dimethyl carbonate and diethyl carbonate When a low viscosity, low dielectric constant linear carbonate is mixed in an appropriate ratio, an electrolyte having a higher electric conductivity can be produced.

As the ether in the organic solvent, any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether and ethyl propyl ether or a mixture of two or more thereof may be used , But is not limited thereto.

Examples of the ester in the organic solvent include methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate,? -Butyrolactone,? -Valerolactone,? -Caprolactone,? -Valerolactone, ε-caprolactone, or a mixture of two or more thereof, but the present invention is not limited thereto.

The injection of the nonaqueous electrolyte solution can be performed at an appropriate stage of the manufacturing process of the electrochemical device according to the manufacturing process and required properties of the final product. That is, it can be applied before assembling the electrochemical device or in the final stage of assembling the electrochemical device.

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.

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.

10: substrate for planar electrochemical device
11: Separator
12: Cathode
13: anode
20, 22: Porous coating layer
21: Planar porous coating layer
30: gas channel
40: Slot-die dispensing device
41: nozzle
100, 101, 102, and 103: substrates for electrochemical devices having improved gas discharge properties
200, 201, 202: electrode assembly

Claims (17)

A substrate for planar electrochemical devices;
Porous coating layers coated on at least one side of the base material for planar electrochemical devices, spaced apart from each other in the longitudinal direction, and including inorganic particles and a polymeric binder; And
And a gas flow channel positioned between the spaced-apart porous coating layers,
Wherein the width of the gas flow path is 1 占 퐉 to 1,000 占 퐉. The method according to claim 1,
Wherein the porous coating layers are applied in a continuous pattern or in an intermittent pattern. 3. The method of claim 2,
Wherein the porous coating layers applied in the intermittent pattern are polygonal, circular or elliptical. The method according to claim 1,
Wherein the porous coating layer has a thickness of 0.01 to 50 占 퐉. delete The method according to claim 1,
Wherein the inorganic particles are inorganic particles having a dielectric constant of 5 or more, inorganic particles having a lithium ion transporting ability, or mixtures thereof. The method according to claim 6,
Inorganic particles is greater than or equal to the dielectric constant of _{5, SrTiO 3, SnO 2, CeO} 2, MgO, NiO, CaO, ZnO, ZrO 2, SiO 2, Y 2 O 3, Al 2 O 3, AlOOH, Al (OH) 3 _{, TiO 2, SiC, BaTiO 3} , Pb (Zr x, Ti 1 -x) O 3 (PZT, where, 0 <x <1 _{Im), 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 And HfO ₂ , or a mixture of two or more thereof. The substrate for an electrochemical device according to claim 1, The method according to claim 6,
Wherein the inorganic particles having lithium ion transferring ability are selected from the group consisting of lithium phosphate (Li ₃ PO ₄ ), lithium titanium phosphate (Li _x Ti _y (PO ₄ ) ₃ , 0 <x <2, 0 <y < 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 , 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 method according to claim 1,
The polymer binder may be selected from the group consisting of polyvinylidene fluoride (PVDF), hexafluoro propylene (HFP), polyvinylidene fluoride-co-hexafluoro propylene ), Polyvinylidene fluoride-co-trichlorethylene, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylpyrrolidone, But are not limited to, polyvinylacetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate (cellulose acetate) acetate propionate, cyanoethylpullulan, But are not limited to, ethyl polyvinyl alcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer, and polyimide, or a mixture of two or more thereof. The electrochemical device of claim 1, The method according to claim 1,
Wherein the planar substrate for an electrochemical device is a separator, a cathode, or an anode. 11. The method of claim 10,
The separator may be made of a material selected from the group consisting of polyethylene, polypropylene, polybutylene, polypentene, polyethylene terephthalate, polybutylene terephthalate, polyester ), Polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide, polyphenylene oxide, Wherein the porous substrate is a porous substrate composed of any one selected from the group consisting of polytetrafluoroethylene, polyphenylene sulfide, and polyethylene naphthalene, or a mixture of two or more thereof. . 11. The method of claim 10,
The cathode includes a flat cathode current collector; And
And a cathode active material layer formed on at least one surface of the cathode current collector. 11. The method of claim 10,
The anode includes a planar anode current collector; And
And an anode active material layer formed on at least one surface of the anode current collector. Preparing a substrate for an electrochemical device; And
Applying a porous coating layer on at least one surface of the base material for electrochemical devices, the porous coating layers being spaced apart from each other and longitudinally applied;
The method of manufacturing a substrate for an electrochemical device according to any one of claims 1 to 3, 15. The method of claim 14,
Wherein the step of applying the porous coating layer is performed by using a slot-die coating apparatus including injection openings spaced apart from each other. 1. An electrochemical device comprising a substrate for an electrochemical device,
The electrochemical device substrate according to any one of claims 1 to 4 and 6 to 13, which is a substrate for an electrochemical device having improved gas evacuation property. 17. The method of claim 16,
Wherein the electrochemical device is a lithium secondary battery.

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