KR102130051B1 - Preparation method of electrode for secondary battery, electrode for secondary battery prepared by the same and secondary battery comprising the electrode - Google Patents

Abstract

The present invention is a first step of providing a current collector having a surface temperature of 60°C to 120°C; A second step of forming a composition for forming an electrode active material layer on the current collector; And a third step of forming an electrode active material layer by drying the current collector on which the composition for forming the electrode active material layer is formed, the electrode for a secondary battery and the electrode for a secondary battery manufactured by the manufacturing method. It relates to a secondary battery included.

Description

A method for manufacturing a secondary battery electrode, a secondary battery electrode prepared by the manufacturing method, and a secondary battery including the secondary battery electrode{Preparation method of electrode for secondary battery, electrode for secondary battery prepared by the same and secondary battery comprising the electrode}

The present invention relates to a method for manufacturing an electrode for a secondary battery, a secondary battery electrode manufactured by the manufacturing method, and a secondary battery including the secondary battery electrode.

Recently, interest in energy storage technology has been increasing. As the field of application extends to mid- and large-sized batteries of electric vehicles such as mobile phones, camcorders and notebook PCs, and also HEVs, PHEVs, and EVs, the demand for high energy density of batteries used as power sources for such electronic devices is increasing. Lithium secondary batteries are the ones that can best meet these needs, and research is currently actively underway.

However, such a lithium secondary battery has safety problems such as ignition and explosion due to the use of an organic electrolytic solution, and has a disadvantage in that it is difficult to manufacture. In particular, as the utilization range of lithium secondary batteries has recently dramatically expanded, lithium secondary batteries have been used in various conditions and environments, and accordingly, demands for higher capacity lithium secondary batteries have gradually increased. In order to provide a high-capacity lithium secondary battery, the operating range of the battery is gradually expanding. As the battery is operated at a high voltage, a benefit may be obtained in terms of capacity, but safety issues have been highlighted.

On the other hand, the performance of the high-loading negative electrode is required according to the high capacity of the lithium secondary battery. When an electrode is prepared by applying the existing composition for forming an active material layer by high loading, the adhesive force between the electrode current collector and the active material decreases as the solvent evaporates during the drying process and the binder is severely localized on the electrode surface. Therefore, in the case of manufacturing a high-loading electrode, a binder ratio is selected and increased to increase adhesion, and in this case, there is a disadvantage in that the resistance of the electrode increases.

KR2005-0027224A (2005.03.18)

An object of the present invention is the electrode active material layer of the electrode current collector adjacent to the electrode current collector is more distributed than the conventional, the binder is not ubiquitous and evenly distributed in the thickness direction is excellent adhesion between the electrode current collector and the electrode active material layer of the secondary battery It is to provide an electrode for a secondary battery and a method for manufacturing the same.

Another object of the present invention is to provide a secondary battery capable of improving charge-discharge rate characteristics and charge-discharge life characteristics by increasing the current collecting effect of the electrode.

In order to solve the above problems, the present invention is a first step of providing a current collector having a surface temperature of 60°C to 120°C; A second step of forming a composition for forming an electrode active material layer on the current collector; And drying the current collector on which the composition for forming the electrode active material layer is formed to form an electrode active material layer.

In addition, the present invention provides an electrode for a secondary battery manufactured by the method of manufacturing the electrode for a secondary battery.

In addition, the present invention provides a secondary battery comprising the electrode for the secondary battery.

In the present invention, since the composition for forming an electrode active material layer is formed on a current collector having a surface temperature of 60°C to 120°C, drying proceeds step by step from the composition for forming an electrode active material layer adjacent to the current collector. do. Due to this, since the binder in the electrode active material layer is more distributed on the surface of the current collector than the conventional electrode, the binder is not distributed and is evenly distributed in the thickness direction, thereby improving the adhesion between the electrode active material layer and the current collector.

Since the present invention provides an electrode having excellent adhesion between the electrode active material layer and the current collector, the current collecting effect of the electrode is increased and the charge/discharge rate characteristics and the charge/discharge life characteristics of the secondary battery as a final product can be improved.

Hereinafter, the present invention will be described in more detail to aid understanding of the present invention.

Terms or words used in the present specification and claims should not be interpreted as being limited to a conventional or lexical meaning, and the inventor can appropriately define the concept of terms in order to describe his or her invention in the best way. Based on the principle that it should be interpreted as a meaning and a concept consistent with the technical idea of the present invention.

A method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention includes a first step of providing a current collector having a surface temperature of 60°C to 120°C. Specifically, the first step may be a step of providing a current collector having a surface temperature of 80°C to 100°C. If the above-mentioned temperature range is satisfied, it is possible to provide a current collector in which only the surface temperature is increased without being oxidized in the air. However, if it is lower than the above-described temperature range, the composition for forming an electrode active material layer, which will be described later, is not dried stepwise from a portion in contact with the surface of the current collector to a portion in contact with air. If it is higher than the above-mentioned temperature range, the current collector surface is oxidized, and thus the adhesive strength improvement effect is not exhibited, and additional measures such as creating an inert gas atmosphere to prevent oxidation of the current collector surface must be performed, which makes the electrode manufacturing process cumbersome. .

The first step may be a step of heating the current collector to increase the temperature of the surface to 60°C to 120°C and then provide it.

The current collector may be a positive electrode current collector or a negative electrode current collector, and the thickness may be 3 μm to 500 μm. The current collector should be highly conductive and the electrode active material layer, which will be described later, can be easily adhered to and has no reactivity in the voltage range of the battery. Specific examples of the positive electrode current collector include aluminum, nickel, or alloys thereof, and specific examples of the negative electrode current collector include copper, gold, nickel, or alloys thereof.

The method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention may further include the step of surface-treating the current collector before performing the first step. If the surface treatment step is performed, the adhesion between the current collector and the electrode active material layer to be described later may be further improved. The surface treatment may be heat treatment, plasma treatment or corona treatment. The heat treatment may be a heat treatment made under an inert atmosphere to prevent oxidation of the current collector.

If the method of manufacturing the electrode for transfer paper according to an embodiment of the present invention includes the step of surface treatment, after the surface treatment of the current collector, the temperature of the surface of the current collector is provided to cool to 60 to 120° C. After cooling the current collector and heating it, it may be provided after raising the temperature of the surface to 60°C to 120°C.

A method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention includes a second step of forming a composition for forming an electrode active material layer on the current collector.

When the second step is performed, the composition for forming an electrode active material layer adjacent to the surface of the current collector is dried first and the rest is dried in a third step, which will be described later. The amount of the composition for forming the electrode active material layer that is dried first may be 10 to 20% of the composition for forming the entire electrode active material layer. In general, the binder moves to the surface together with the solvent vaporized in the process of drying the composition. In the present invention, as the composition for forming the electrode active material layer adjacent to the surface of the current collector is first dried, the movement of the binder is limited. A lot of binder stays at the interface between the whole and the electrode active material layer. As a result, adhesion between the current collector and the electrode active material layer is excellent.

When the surface temperature of the current collector does not satisfy the above-mentioned range, specifically, when it is lower than the above-mentioned range, the composition for forming the electrode active material layer is not dried in the second step, and only in the third step to be described later. Drying takes place. If drying is performed on the entire composition for forming an electrode active material layer only in the third step to be described later, since the surface of the composition for forming an electrode active material layer, that is, drying is performed from a portion in contact with air, the binder moves with the vaporized solvent to the surface. This causes the adhesive force between the current collector and the active material layer to be weakened.

The second step may be a step of forming a composition for forming the electrode active material layer on the current collector in a loading amount of 10mg/cm2 to 30mg/cm2. Specifically, it may be a step of forming a composition for forming the electrode active material layer on the current collector in a loading amount of 12 mg/cm 2 to 20 mg/cm 2. When formed in the above-described amount, it is possible to improve the charge-discharge rate characteristics and the charge-discharge life characteristics of the secondary battery as a final product.

The electrode active material layer-forming composition may be a slurry.

The viscosity of the composition for forming the electrode active material layer may be 550 cps to 10,000 cps at room temperature, and specifically, may be 2,000 cps to 8,000 cps. If the above-mentioned viscosity range is satisfied, the process is easy.

Meanwhile, the composition for forming the electrode active material layer may include an electrode active material, a conductive material, a binder, and a solvent. The electrode for a secondary battery according to an embodiment of the present invention may be a cathode or an anode. When the electrode is a negative electrode, the electrode active material is a negative electrode active material and may be carbon-based. Specific examples of the negative electrode active material include crystalline carbon, amorphous carbon, or a carbon composite, and these may be used alone or in combination of two or more. When the electrode is a positive electrode, the electrode active material is a positive electrode active material. The positive electrode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ) or lithium nickel oxide (LiNiO ₂ ) or a compound substituted with one or more transition metals; Lithium manganese acid cyclate (LiMnO ₂ ); Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxide; Nickel-site-type lithium nickel oxide; It may be a compound having a lithium intercalation material as a main component, such as a lithium manganese composite oxide, a disulfide compound, or a composite oxide formed by a combination thereof. Specific examples of the positive electrode active material are Li _x CoO ₂ (0.5<x<1.3), Li _x NiO ₂ (0.5<x<1.3), Li _x MnO ₂ (0.5<x<1.3), Li _x Mn ₂ O ₄ ( 0.5<x<1.3), Li _x (Ni _a Co _b Mn _c )O ₂ (0.5<x<1.3, 0<a<1, 0<b<1, 0<c<1, a+b+c= 1), Li _x Ni _1-y Co _y O ₂ (0.5<x<1.3, 0<y<1), Li _x Co _1-y Mn _y O ₂ (0.5<x<1.3, 0≤y<1) , Li _x Ni _1-y Mn _y O ₂ (0.5<x<1.3, O≤y<1), Li _x (Ni _a Co _b Mn _c )O ₄ (0.5<x<1.3, 0<a<2, 0<b<2, 0<c<2, a+b+c=2), Li _x Mn _2-z Ni _z O ₄ (0.5<x<1.3, 0<z<2), Li _x Mn _{2- z} Co _z O ₄ (0.5<x<1.3, 0<z<2), Li _x CoPO ₄ (0.5<x<1.3), Li _x FePO ₄ (0.5<x<1.3), and the like. The lithium-containing transition metal oxide may be coated with a metal such as aluminum (Al) or a metal oxide.

The conductive material has conductivity without causing side reactions with other elements of the battery. Specific examples of the conductive material include graphite such as natural graphite or artificial graphite; Carbon blacks such as carbon black (super-p), acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder, and nickel powder; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; And a conductive material such as polyphenylene derivative.

The binder is a component that assists in bonding the electrode active material and the conductive material and bonding to the current collector. Specific examples of the binder include vinylidene fluoride-hexaflooropropylene copolymer (PVDF-co-HFP), polyvinylidenefluoride, polyacrylonitrile, polymethylmethacrylate , Polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, polyacrylic acid, ethylene-propylene-diene monomer (EPDM) , Sulfonated EPDM, styrene-butadiene rubber (SBR), and fluorine rubber.

Specific examples of the solvent of the composition for forming the electrode active material layer include organic solvents such as NMP (N-methyl pyrrolidone), DMF (dimethyl formamide), acetone, and dimethyl acetamide, or water-based solvents such as water. The solvent may be used alone or in combination of two or more. The amount of use of the solvent is not particularly limited as long as the electrode active material, the binder, and the conductive material can be mixed in consideration of the coating thickness of the slurry and the production yield.

The composition for forming the electrode active material layer may further include additives such as thickeners, fillers, dispersants, or mixtures thereof.

The thickener is a material used to control the viscosity of the composition for forming an electrode active material layer. The thickener is not particularly limited as long as it can provide a viscosity-increasing effect without causing side reactions with other elements of the battery. For example, one or more selected from the group consisting of polyvinyl alcohol and polyacrylic acid may be used.

The filler is a component that inhibits the expansion of the electrode and can be used or not if necessary, and is a fibrous material that does not cause a chemical change in the secondary battery according to an embodiment of the present invention. Specific examples of the filler include olefinic polymers such as polyethylene polypropylene; Glass fiber, carbon fiber, and the like.

Specific examples of the dispersant may be isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, or the like.

As a specific example of a method of forming the composition for forming the electrode active material layer, a doctor blade, die casting, comma coating, screen printing, gravure coating, etc. Can be mentioned.

A method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention includes a third step of drying the current collector on which the composition for forming the electrode active material layer is formed to form an electrode active material layer.

Specifically, the third step may be a step of drying the current collector on which the composition for forming the electrode active material layer is formed at 50°C to 200°C to form an electrode active material layer. When dried at the above-mentioned temperature, the binder in the composition for forming the remaining electrode active material layer that is not dried in the second step is uniformly dispersed, specifically, while being uniformly dispersed in the thickness direction to be dried and adhered between the current collector and the electrode active material layer With this improvement, the current collecting effect of the electrode, which is the final product, is increased. In addition, since the current collecting effect of the electrode is increased, the charge/discharge rate characteristics and the charge/discharge life characteristics of the final product battery are improved.

In addition, in the third step, the current collector on which the composition for forming the electrode active material layer is formed is first dried at a temperature of 60°C to 100°C of circulated air, and after pressing, for 8 hours to a temperature of 100°C to 200°C It may be a step of secondary drying for 12 hours to form an electrode active material layer.

The primary drying may be a process of removing the solvent in the composition for forming the electrode active material layer. The second drying may be a process of removing moisture in the composition for forming an electrode active material layer in which the first drying is performed. The secondary drying may be performed in an oven in a vacuum state without circulation of air, and the temperature during the secondary drying may be an internal temperature of the oven.

An electrode for a secondary battery according to another embodiment of the present invention is manufactured by the above manufacturing method.

The secondary battery according to another embodiment of the present invention includes the electrode for the secondary battery.

A secondary battery according to another embodiment of the present invention includes an electrode (cathode) for a secondary battery according to another embodiment of the present invention, an electrode assembly including an anode and a separator positioned between the anode and an electrolyte.

Descriptions of the positive electrode and the negative electrode have been described above, and thus will be omitted.

The separator prevents a short circuit between the negative electrode and the positive electrode and provides a passage for lithium ions. As the separator, an insulating thin film having high ion permeability and mechanical strength may be used. Specific examples of the separation membrane include polyolefin-based polymer membranes such as polypropylene and polyethylene, or multiple membranes thereof, microporous films, woven fabrics, and nonwoven fabrics. When a solid electrolyte such as a polymer is used as the electrolyte to be described later, the solid electrolyte may also serve as a separator.

The electrolyte may be a lithium salt-containing non-aqueous electrolyte. Specific examples of the lithium salt include LiCl, LiBr, LiI, LiClO ₄ , LiBF ₄ , LiB ₁₀ Cl ₁₀ , LiPF ₆ , LiCF ₃ SO ₃ , LiCF ₃ CO ₂ , LiAsF ₆ , LiSbF ₆ , LiAlCl ₄ , CH ₃ SO ₃ Li , (CF ₃ SO ₂ ) ₂ NLi, lower aliphatic lithium carboxylate, lithium 4phenylborate, imide, and the like.

The non-aqueous electrolyte is not particularly limited as long as it is used in the battery, but specific examples thereof include a non-aqueous organic solvent, an organic solid electrolyte, and an inorganic solid electrolyte. Specific examples of the organic solid electrolyte include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphoric acid ester polymers, polyagitation lysine, polyester sulfide, polyvinyl alcohol, polyvinylidene fluoride, and ionic dissociation. And polymers containing groups.

The external shape of the secondary battery according to another embodiment of the present invention is not particularly limited, but specific examples include a cylindrical shape, a square shape, a pouch shape, and a coin shape using cans.

Hereinafter, examples will be described in detail to describe the present invention in detail. However, the embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

<Examples 1 to 8: Preparation of negative electrode>

Preparation of negative electrode active material forming composition

200 g of a mixture of natural graphite having a crystallinity of 0.2 as a negative electrode active material, Super-P 65 as a conductive material, styrene-butadiene rubber (SBR) as a binder, and carboxymethyl cellulose (CMC) as a thickener was prepared in the contents shown in Table 1. . A composition for forming a negative electrode active material was prepared by mixing 200 g of the mixture and 220 ml of water.

Preparation of cathode

The surface of the copper (Cu) thin film, which is a negative electrode current collector having a thickness of 10 μm, was heated to 90° C., and the composition for forming the negative electrode active material was applied to the surface of the heated copper thin film in the loading amount shown in Table 1, followed by drying. Did. At this time, the temperature of the circulated air was 80°C. Subsequently, after performing a roll press, drying at 130° C. for 12 hours, followed by punching in a circle of 1.4875 cm 2 to complete the cathode.

Cathode active material
(weight%) Conductive material
(weight%) bookbinder
(weight%) Thickener
(weight%) Loading amount
(Mg/cm2) Example 1 97.5 0.5 1.0 1.0 10.0 Example 2 12.4 Example 3 14.8 Example 4 16.8 Example 5 20.0 Example 6 97.7 0.5 0.8 1.0 14.8 Example 7 16.8 Example 8 20.0

<Comparative Examples 1 to 8: Preparation of negative electrode>

Preparation of negative electrode active material forming composition

200 g of a mixture of natural graphite having a crystallinity of 0.2 as a negative electrode active material, Super-P 65 as a conductive material, styrene-butadiene rubber (SBR) as a binder, and carboxymethyl cellulose (CMC) as a thickener was prepared in the contents shown in Table 1. . A composition for forming a negative electrode active material was prepared by mixing 200 g of the mixture and 220 ml of water.

Preparation of cathode

The composition for forming the negative electrode active material was loaded on the surface of a copper (Cu) thin film having a thickness of 10 μm as a negative electrode current collector in an amount shown in Table 2 to form. At this time, the temperature of the surface of the negative electrode current collector was 23°C, and the temperature of the circulated air was 80°C. Subsequently, after performing a roll press, drying was performed at 130° C. for 12 hours, followed by punching into a circle of 1.4875 cm 2 to complete the cathode.

Cathode active material
(weight%) Conductive material
(weight%) bookbinder
(weight%) Thickener
(weight%) Loading amount
(Mg/cm2) Comparative Example 1 97.5 0.5 1.0 1.0 10.0 Comparative Example 2 12.4 Comparative Example 3 14.8 Comparative Example 4 16.8 Big Education 5 20.0 Comparative Example 6 97.7 0.5 0.8 1.0 14.8 Comparative Example 7 16.8 Comparative Example 8 20.0

<Examples 9 to 12, Comparative Example 9 and Comparative Example 10: Preparation of lithium secondary battery>

The negative electrode described in Table 3 below was cut into a circular shape of 1.4875 cm 2 to make it a working electrode (cathode), and the positive electrode described in Table 3 cut into a circular shape of 1.4875 cm 2 was used as a counter electrode to make a coin-type half cell. ). After interposing a porous polyolefin separator between the working electrode and the counter electrode, a non-aqueous organic solvent having a composition of ethylene carbonate (EC): ethyl methyl carbonate (EMC): dimethyl carbonate (DMC) = 3:3:4 (volume ratio), and As a lithium salt, a lithium secondary battery was prepared by injecting a non-aqueous electrolyte solution in which LiPF ₆ was added at 1 mol/L based on the total amount of the non-aqueous electrolyte. On the other hand, in the case of Comparative Example 11 and Comparative Example 12, due to the low adhesion between the negative electrode current collector and the negative electrode active material layer, it is difficult to manufacture an electrode due to severe detachment during the roll press and punching process, and it is also impossible to manufacture a battery later.

cathode anode Example 9 Cathode of Example 3 Lithium metal foil Example 10 Cathode of Example 4 Example 11 Cathode of Example 6 Example 12 Cathode of Example 7 Comparative Example 9 Cathode of Comparative Example 3 Comparative Example 10 Cathode of Comparative Example 4 Comparative Example 11 Cathode of Comparative Example 6 Comparative Example 12 Cathode of Comparative Example 7

<Experimental Example 1: Evaluation of adhesion of negative electrode>

The cathodes of Examples 1 to 8 and Comparative Examples 1 to 8 were cut at intervals of 15 mm and fixed to a slice glass, and then peeled off the current collector while performing a 180° peel test (peel test) to peel strength (stickiness). Was measured. The evaluation was determined by measuring the peel strength of 5 or more, and was set as an average value, and is shown in Table 4 below.

division Adhesion (gf/15㎜) division Adhesion (gf/15㎜) Adhesion difference Example 1 47 Comparative Example 1 43 4 Example 2 42 Comparative Example 2 37 5 Example 3 34 Comparative Example 3 25 9 Example 4 24 Comparative Example 4 12 12 Example 5 19 Comparative Example 5 6 13 Example 6 23 Comparative Example 6 4 19 Example 7 18 Comparative Example 7 2 16 Example 8 15 Comparative Example 8 2 13

Referring to Table 4, it can be seen that when the negative electrode slurry is formed while the temperature of the surface of the current collector is 90° C., the adhesion between the current collector and the active material layer is improved even if the negative electrode slurry has the same composition. In particular, it was confirmed that the more the negative electrode active material was loaded into the current collector, the greater the effect of improving the adhesive strength. This indicates that the process of the present invention can provide better adhesion when applied to high-loading electrodes.

And when the loading amount is the same in Examples 3 to 8 and Comparative Examples 3 to 8, respectively, when the loading amount is the same, the surface temperature of the current collector when forming the negative electrode active material layer and the composition for forming the negative electrode active material It has been found that the amount of the binder affects the adhesion between the current collector and the active material layer. And when comparing Example 6 to Example 8 and Comparative Example 3 and Comparative Example 4, if the surface temperature of the current collector at the time of forming the negative electrode active material layer is adjusted, Comparative Example 3 and Comparative Example containing a lot of binder even if a little binder is included It was confirmed that it was possible to implement a similar or superior level of adhesive strength to 4, and it was confirmed that it exhibited a rather excellent effect in the rate characteristics, which will be described later.

<Experimental Example 2: Evaluation of rate characteristics of the battery>

Rate capability, which is a characteristic of the lithium secondary battery of Examples 9 to 12 and Comparative Examples 9 to 12, was charged and discharged. Charging was performed until the constant current (CC) of 0.1C became 0.05V, and then the constant voltage (CV) was charged to 0.05V to perform charging once until the charging current became 0.005mAh. Thereafter, it was allowed to stand for 20 minutes, and then discharged until the constant current of 0.1C became 1.5 V, and the discharge capacity at the first cycle was measured. After that, the charge was the same and the discharge was 1.0C, and the 1.0C discharge capacity was compared with the 0.2C discharge capacity. The results are shown in Table 5 below.

division Capacity retention rate of 1.0C compared to 0.2C (%) division Capacity retention rate of 1.0C compared to 0.2C (%) Example 9 83% Comparative Example 9 82% Example 10 79% Comparative Example 10 78% Example 11 91% Comparative Example 11 Measurement not possible Example 12 88% Comparative Example 12 Measurement not possible

Referring to Table 5, the lithium secondary batteries of Examples 11 and 12 with a small amount of binder had excellent capacity retention. Since the rate-limiting property becomes excellent if a small amount of the binder is included in the electrode active material layer so that the adhesion is guaranteed, the lithium secondary battery according to the manufacturing method of the present invention can satisfy both the adhesion and rate-limiting properties even with a small amount of the binder. It means you can. However, in the case of Comparative Examples 11 and 12, since the battery was not prepared as described above, rate-rate characteristics could not be evaluated.

Claims (11)

A first step of providing a current collector having a surface temperature of 60°C to 120°C;
A second step of forming a composition for forming an electrode active material layer on the current collector in a loading amount of 10 mg/cm 2 to 30 mg/cm 2; And
And a third step of drying the current collector on which the composition for forming the electrode active material layer is formed to form an electrode active material layer.
The method according to claim 1,
The first step is a method of manufacturing a secondary battery electrode, characterized in that the step of providing a current collector having a surface temperature of 80°C to 100°C.
The method according to claim 1,
The manufacturing method of the electrode for a secondary battery further comprises the step of surface-treating the current collector before the first step.
The method according to claim 3,
The surface treatment is a method of manufacturing an electrode, characterized in that the heat treatment, plasma treatment or corona treatment.
The method according to claim 1,
The electrode active material layer-forming composition comprises an electrode active material, a conductive material and a binder, a method for manufacturing a secondary battery electrode.
The method according to claim 1,
The electrode active material layer forming composition has a viscosity of 550cps to 10,000cps method of manufacturing a secondary battery electrode.
delete The method according to claim 1,
The third step is a method of manufacturing an electrode for a secondary battery, characterized in that the step of drying the current collector on which the composition for forming the electrode active material layer is formed at 50°C to 200°C to form an electrode active material layer.
The method according to claim 1,
The method for manufacturing a secondary battery electrode, characterized in that the secondary battery electrode is a cathode.
An electrode for a secondary battery manufactured by the method of any one of claims 1 to 6, 8 and 9.
A secondary battery comprising the electrode for secondary batteries of claim 10.