KR101718467B1 - Method for preparing electrode comprising inorganic coating layer, electrode prepared by the method, and secondary battery comprising the electrode - Google Patents

Abstract

The present invention relates to a method of manufacturing an electrode, and more particularly, to a method of manufacturing an electrode including an inorganic coating layer, an electrode manufactured by the method, and a secondary battery including the electrode. According to an embodiment of the present invention, there is provided a method of manufacturing an electrode active material, comprising: forming an electrode active material layer by dispersing electrode active material particles in a binder solution of a binder and a solvent to dry a slurry layer coated on at least one surface of the current collector; And depositing inorganic particles on one surface of the electrode active material layer to form an inorganic coating layer. According to the electrode manufacturing method of the embodiment of the present invention, the deformation of the electrode and the residual stress of the electrode due to the high-temperature process are greatly reduced, unnecessary cost due to monitoring of the moisture content and repetition of additional drying is reduced, The blocking of the additional moisture permeation can be achieved.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing an electrode including an inorganic coating layer, an electrode manufactured by the method, and a secondary battery including the electrode,

The present invention relates to a method of manufacturing an electrode, and more particularly, to a method of manufacturing an electrode including an inorganic coating layer, an electrode manufactured by the method, and a secondary battery including the electrode.

Recently, interest in energy storage technology is increasing. Efforts to research and develop electrochemical devices are becoming more and more evident as the applications of cellular phones, camcorders, notebook PCs, electric vehicles and electric power storage are expanded. 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 Are used in various fields requiring energy storage technology.

In the production of such a lithium secondary battery, when the respective electrode active material layers are coated on the current collector of the positive electrode and the negative electrode, a slurry in which the electrode active material particles are dispersed in the binder solution is applied to the current collector, To remove the solvent and moisture present in the slurry, thereby forming an electrode active material layer. The step of forming the electrode active material layer is subjected to a vacuum drying technique, in particular, to prevent moisture penetration in the electrode, thereby maintaining side reactions and battery performance and stability.

However, according to the conventional drying technique, it is troublesome to follow the procedure of monitoring the water content in the electrode active material layer after drying, and the additional cost due to the additional drying process after the measurement of the moisture content may be a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing an electrode that does not require monitoring of moisture content, thereby reducing the burden on process hassle and an additional cost increase.

According to an aspect of the present invention, there is provided a method of manufacturing an electrode active material layer, comprising: forming an electrode active material layer by dispersing electrode active material particles in a binder solution of a binder and a solvent and drying the slurry layer coated on at least one surface of the current collector; ; And depositing inorganic particles on one surface of the electrode active material layer to form an inorganic coating layer.

The present invention relates to a method of manufacturing an electrode for depositing inorganic particles on one surface of an electrode active material layer, wherein the deformation of the electrode and the residual stress of the electrode in the high temperature process are greatly reduced and the unnecessary cost And the barrier of additional moisture penetration can be achieved by the inorganic coating layer of such inorganic particles serving as a barrier against moisture.

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 flow chart illustrating a method of manufacturing an electrode according to an embodiment of the present invention.
FIG. 2 is a schematic view illustrating a process of rewinding an electrode and forming an inorganic coating layer according to an embodiment of the present invention. Referring to FIG.
FIG. 3 is a schematic view of a plasma enhanced chemical vapor deposition (PECVD) according to an embodiment of the present invention. Referring to FIG.

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.

In addition, since the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It is to be understood that equivalents and modifications are possible.

1 is a flow chart illustrating a method of manufacturing an electrode according to an embodiment of the present invention.

First, an electrode active material layer is formed according to one aspect of the present invention (step S1).

The electrode active material layer is formed on the current collector. The electrode active material layer is formed by first forming a slurry layer on the current collector, and then drying the slurry layer. The slurry layer is formed by dispersing the electrode active material particles in a binder solution of a binder and a solvent.

Specifically, a binder suitable for the desired electrode is put into a solvent and dissolved to produce a binder solution. Then, electrode active material particles for the desired electrode are added to the resultant binder solution to form a mixture, and the mixture is further subjected to uniformity in the binder solution by stirring or the like using a mixer To finally prepare a slurry for the electrode.

In the manufacturing method according to one aspect of the present invention, the electrode active material (i.e., the positive electrode active material and the negative electrode active material) (or particles thereof) and the current collector (i.e., the positive electrode current collector and the negative electrode current collector) And these can be prepared according to a conventional method known in the art or a modified method thereof.

The cathode active material particle may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with at least one transition metal; A lithium manganese oxide (LiMnO ₂ ) such as LiMnO ₃ , LiMn ₂ O ₃ , LiMnO _2, etc. represented by the formula Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33); Lithium copper oxide (Li ₂ CuO ₂ ); LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ , Cu ₂ V ₂ O ₇ Vanadium oxide; Nickel type lithium nickel oxide represented by the formula LiNi _{1 - x} M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3) oxide); Formula _{LiMn 2 - x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 to 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which part of the lithium in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) _3, or a composite oxide formed of a combination of these materials, and the like, and are not limited thereto.

The cathode current collector has a thickness of, for example, about 3 to about 500 mu m. Such a positive electrode current collector is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery. For example, the positive electrode current collector may be formed on the surface of stainless steel, aluminum, nickel, titanium, sintered carbon or aluminum or stainless steel Carbon, nickel, titanium, silver, or the like may be used. The current collector may have fine irregularities on the surface thereof to increase the adhesive force of the cathode active material, and various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric are possible.

A conductive material may be further mixed with the positive electrode active material particles. Such a conductive material is added, for example, in an amount of about 1 to about 50 wt% based on the total weight of the mixture containing the cathode active material particles. Such a conductive material is not particularly limited as long as it has high conductivity without causing chemical changes in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component that assists in binding of the positive electrode active material particles to the conductive material and bonding to the current collector. For example, the binder is added in an amount of about 1 to about 50 wt% based on the total weight of the mixture containing the positive electrode active material particles do. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

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 a mixture thereof. These solvents provide an appropriate level of viscosity so that a slurry coating layer can be formed at a desired level on the current collector surface.

On the other hand, the negative electrode is manufactured by applying and drying negative electrode active material particles on a negative electrode current collector, and may further include components such as the above-described conductive material, binder, solvent and the like, if necessary.

The cathode current collector has a thickness of, for example, about 3 to about 500 mu m. The negative electrode current collector is not particularly limited as long as it has conductivity without causing chemical changes in the battery, and examples thereof include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, copper or stainless steel Surface-treated with carbon, nickel, titanium, silver or the like, aluminum-cadmium alloy, or the like can be used. In addition, like the positive electrode current collector, fine unevenness may be formed on the surface to enhance the binding force of the negative electrode active material particles, and it may be used in various forms such as films, sheets, foils, nets, porous bodies, foams and nonwoven fabrics.

The negative electrode active material particles include carbon such as hard graphitized carbon and graphite carbon; _{Li x Fe 2 O 3 (0} = x = 1), Li x WO 2 (0 = x = 1), Sn x Me 1 -x Me 'y O z (Me: Mn, Fe, Pb, Ge; Me' : A metal complex oxide of Al, B, P, Si, group 1, group 2, group 3 elements of the periodic table, halogen, 0? X = 1; y = 3; Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4, Bi ₂ O ₅ and the like; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The thus prepared slurry is applied to at least one surface of the selected current collector to form a slurry layer. The application of the slurry can be carried out continuously or discontinuously by various methods such as slot die coating, slide coating, curtain coating and the like. Particularly, in terms of productivity, it is preferable that the application is carried out continuously or simultaneously at the same time. For example, a die having one or more slots may be used to perform the application of the slurry. That is, the slurry is supplied through the slot of the die, and the corresponding current collector corresponding to the slurry is supplied to the rotating roller. A slurry layer is formed by applying a slurry corresponding to one side or both sides of the current collector progressed by these rollers.

And removing the solvent from the formed slurry layer. The solvent can be removed by drying. The one or more slurry layers applied over the current collector are simultaneously or individually dried by using a drier or the like to remove the solvent. Specifically, when it is passed through a dryer or the like, it is affected by heat or hot air, so that the solvent or moisture will be removed by drying in succession from the part directly contacting with heat or hot air to the inside or the opposite part.

Preferably, the step of forming the electrode active material layer can be carried out under vacuum. For the formation of such an electrode active material layer, removing the solvent from the slurry layer under vacuum may be effective in preventing water from being present in the electrode or penetrating from the outside. Such moisture removal is a necessary part because it may cause problems in the performance and stability of the final battery due to an incidental reaction with components in the electrode depending on the presence of moisture. However, it is not easy to completely remove moisture in the electrode only by the step of forming the electrode active material layer under vacuum. Therefore, there is a great demand for formation of an inorganic coating layer by deposition, for example, formation of an inorganic coating layer by deposition of inorganic particles, which will be described later.

Inorganic particles are deposited on one surface of the electrode active material layer formed in step S1 to form an inorganic coating layer (step S2).

The inorganic particles 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 inorganic particles having a dielectric constant of about 5 or more may be 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 (PMN-PT, 0 < x < 1), (1-x) Pb (Mg _1/3 Nb _2/3 ) O _3-x PbTiO ₃ (PLZT, 0 <x < 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.

In addition, the average particle size (D ₅₀ ) of the final deposited inorganic particles may be about 0.30 탆 to about 0.60 탆. When the average particle diameter (D ₅₀ ) of the inorganic particles satisfies this range, the problem that the specific surface area of the inorganic particles increases sharply increases, and at the same time, the thickness of the appropriate inorganic coating layer is finally satisfied. In addition, the maximum particle diameter (D _max ) of the inorganic particles to be finally deposited may be about 3.5 탆.

FIG. 2 is a schematic view of a process of rewinding an electrode and forming an inorganic coating layer according to an embodiment of the present invention. Referring to FIG. The current collector formed with the electrode, that is, the electrode active material layer, requires a rewinding process in order to coat the inorganic particles on the electrode active material layer. The re-winding is performed by exposing the electrode active material layer to the outside so that inorganic particles are deposited on one surface of the electrode active material layer in combination with the current collector in which the electrode active material layer is formed in step S1. The inorganic particles are deposited on the exposed electrode active material layer to form an inorganic coating layer.

In addition, plasma enhanced chemical vapor deposition (PECVD) is a method of depositing such inorganic particles as an inorganic coating layer. 3 is a schematic view of PECVD according to an embodiment of the present invention.

This PECVD is a method of chemical vapor deposition (CVD), which is a deposition technique that provides a precise tolerance used in microelectronics that forms a chemical vapor deposition by causing a chemical reaction in a gas through electrical discharge to be.

Typically, non-equilibrium plasmas such as low pressure glow discharges are used, and PECVD is used to generate reactants through glow discharge, adsorption and diffusion to the substrate surface, activation of the surface bonds and deposition of the resulting gases, Recombination of materials, and the like. PECVD may have a discharge power frequency of about 50 kHz to about 13.56 Mhz through a radio frequency (RF) power supply. In addition, the source gas may vary depending on the inorganic particles to be finally deposited, and may be, for example, at least one monomer selected from the group consisting of aluminum, titanium, silicon, and zirconium. For example, Al (CH ₃ ) ₃ , Al (CH ₃ ) ₃ , (CH ₃ ) ₂ AlOCH (CH ₃ ) ₂ , DMAI, Triisobutyl Aluminum (TIBA), Tetrakis SiH ₄ , Si ₂ H ₆ , Si (OC ₂ H ₅ ) ₄ (Tetraethyl Ortho-Silicate, TEOS), Bis (cyclopentadienyl) zirconium , B (OCH ₃ ) ₃ (trimethyl borate, TMB), P (OCH ₃ ) ₃ (trimethyl phosphate, TMP) The source gas may be partially or wholly formed of a precursor, and the precursor may be used alone or in combination with a part of the source gas to actually deposit the source gas. As the carrier gas, H ₂ , N ₂ , Ar, O ₂ , O ₃ , O ₂ / O ₃ , N ₂ O, NH ₃ , PH ₃ and the like are used. PECVD increases the uniformity in the final deposited layer by a combination of a low pressure and a relatively low temperature, especially a vacuum, and is feasible at a relatively low temperature, so that by a small temperature change, It is possible to reduce the stress.

The step of forming the inorganic coating layer may be carried out at a temperature of from about 1 to about 1.5 Torr, preferably from about 70 to about 130 캜 under vacuum. The formation of the inorganic coating layer within such a range of conditions can bond the porous inorganic particles to the surface of the previously formed electrode active material layer as a waterproof film having a dense structure. Such an inorganic coating layer may be a water or an impurity It can serve as a barrier stratum or a barrier film for preventing the penetration of a material deformed from the electrode active material.

Here, the thickness of the inorganic coating layer may be, for example, about 1 to about 250 占 퐉, preferably about 20 to about 180 占 퐉. When the inorganic coating layer formed on the anode or the cathode satisfies such a thickness range, it is possible to prevent the side reaction between the electrode, particularly the cathode and the electrolytic solution, while maintaining the amount of the electrode active material in each electrode, Not only the performance of the battery is improved, but also the safety of the battery can be improved by preventing moisture penetration.

A secondary battery such as an electrochemical device such as a lithium secondary battery is manufactured by winding or laminating the electrodes of different kinds manufactured according to the manufacturing method of the present invention described above, that is, the positive electrode and the negative electrode with a separator interposed therebetween .

As the porous substrate of the separator for insulating the electrodes between the anode and the cathode, any porous substrate used for electrochemical devices such as a porous membrane or nonwoven fabric formed of various polymers can be used. For example, a polyolefin porous film used as a separator for an electrochemical device, particularly, a lithium secondary battery, or a nonwoven fabric made of polyethylene terephthalate fiber may be used. The material and the shape may be variously selected depending on the purpose. For example, the polyolefin-based porous membrane may be formed of a polymer such as polyethylene, polypropylene, polybutylene, or polypentene, such as high-density polyethylene, linear low-density polyethylene, low-density polyethylene, ultra-high molecular weight polyethylene, And the nonwoven fabric may also be made of a polyolefin-based polymer or a fiber using a polymer having higher heat resistance. The thickness of the porous substrate is not particularly limited, but is preferably about 1 to about 100 mu m, more preferably about 5 to about 50 mu m, and the pore size and porosity existing in the porous substrate are also not particularly limited, To about 50 [mu] m and from about 10 to about 95%.

The electrolytic solution which can be used in the electrochemical device of the present invention is a salt having a structure such as A ⁺ B ^- , wherein A ⁺ includes an alkali metal cation such as Li ⁺ , Na ⁺ , K ^{+ -} it is _{^{PF 6 -, BF 4 -,}} Cl -, Br -, I -, ClO 4 -, AsF 6 -, CH 3 CO 2 -, CF 3 SO 3 -, N (CF 3 SO 2) 2 -, C (CF ₂ SO _{2) 3} ^- anion, or a salt containing an ion composed of a combination of propylene carbonate (PC) such as, ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl (DMP), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethylmethyl carbonate (EMC), gamma butyrolactone -Butyrolactone), or a mixture thereof, but the present invention is not limited thereto.

The electrolyte may be injected 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.

In addition, 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 cells, secondary batteries, fuel cells, solar cells, and super capacitors, . 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.

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 to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

Claims (17)

Forming an electrode active material layer by drying an electrode active material particle dispersed in a binder solution of a binder and a solvent and drying the slurry layer coated on at least one surface of the current collector; And
And forming an inorganic coating layer by plasma chemical vapor deposition (PECVD) of inorganic particles on the surface of the electrode active material layer at a temperature of 70 to 130 ° C. under vacuum,
The forming of the inorganic coating _{layer, Al (CH 3) 3,} (CH 3) 2 AlOCH (CH 3) 2 (dimethylaluminium isopropoxide, DMAI), Triisobutyl Aluminum (TIBA), Tetrakis (diethylamino) titanium, SiH 4, Si 2 _{H 6, Si (OC 2 H} 5) 4 (Tetraethyl Ortho-Silicate, TEOS), Bis (cyclopentadienyl) zirconium, B (OCH 3) 3 (Trimethyl borate, TMB) or _{P (OCH 3) 3 (Trimethyl} phosphate, TMP ) Is used as a source gas,
Wherein the formation of the inorganic coating layer is performed on the surface of the electrode active material layer exposed to the outside during the rewinding of the current collector in which the electrode active material layer in the wound state is formed
Gt;
delete delete delete delete The method according to claim 1,
Wherein the electrode active material particle is a cathode active material particle or an anode active material particle.
The method according to claim 6,
Wherein the cathode active material particle is a layered compound of lithium cobalt oxide (LiCoO ₂ ) or lithium nickel oxide (LiNiO ₂ ) or a compound in which at least one transition metal is substituted; A lithium manganese oxide (LiMnO ₂ ) of LiMnO ₃ , LiMn ₂ O ₃ or LiMnO _{2 with} the formula Li _{1 + x} Mn _{2 -x} O ₄ where x is 0 to 0.33; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides of LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ or Cu ₂ V ₂ O ₇ ; Nickel type lithium nickel oxide represented by the formula LiNi _{1 - x} M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3) oxide); Formula _{LiMn 2 - x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 to 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which part of the lithium in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) _3, or a combination thereof.
The method according to claim 6,
Carbon of the non-graphitized carbon or graphite carbon; _{Li x Fe 2 O 3 (0} = x = 1), Li x WO 2 (0 = x = 1), Sn x Me 1 -x Me 'y O z (Me: Mn, Fe, Pb, Ge; Me' : A metal complex oxide of Al, B, P, Si, group 1, group 2, group 3 elements of the periodic table, halogen, 0? X = 1; y = 3; Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4 , or An oxide of Bi ₂ O ₅ ; A conductive polymer of polyacetylene; Li-Co-Ni based material.
The method according to claim 1,
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.
10. The method of claim 9,
The inorganic particles are _{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), hafnia (HfO _2), And at least one 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 , SiC and TiO ₂ And the mixture is a mixture.
delete The method according to claim 1,
Wherein the inorganic coating layer has a thickness of 1 to 250 占 퐉.
The method according to claim 1,
Wherein the binder is selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, , Ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, and fluorine rubber.
The method according to claim 1,
Wherein the solvent is selected from the group consisting of acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methyl-2-pyrrolidone, wherein the electrolyte is one or a mixture of two or more selected from the group consisting of N-methylpyrrolidone, NMP, and cyclohexane.
An electrode produced by the manufacturing method according to any one of claims 1, 6 to 10, and 12 to 14.
A secondary battery comprising the electrode of claim 15.
17. The method of claim 16,
Wherein the secondary battery is a lithium secondary battery.

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