KR20200015187A - Method of manufacturing electrode improving curl of foil and preventing foil folding - Google Patents

Abstract

The present invention relates to a method for manufacturing a roll-to-roll type unit electrode. More specifically, the present invention relates to a method for manufacturing a unit electrode, comprising the following steps: (a) irradiating light to both ends of the metal ultrathin foil; (b) applying electrostatic force to both ends of the ultrathin foil with light irradiated; (C) forming a coating layer by applying an electrode mixture containing an electrode active material on the ultrathin foil; and (d) drying the ultrathin foil on which the coating layer is formed and then rolling the same.

Description

Electrode manufacturing method to improve the bending and folding of the ultrathin {Method of manufacturing electrode improving curl of foil and preventing foil folding}

The present invention relates to a method for manufacturing a unit electrode by a roll-to-roll process, a method for preventing the folding phenomenon due to the ultra-thin curve during the process.

Recent trends in the electronics industry can be relieved by device, wireless, and mobile trends and the shift from analog to digital. Representative examples include the rapid spread of cordless phones (aka mobile phones) and notebook computers, as well as calls from analog cameras to digital cameras.

In addition to these trends, research and development on secondary batteries as an operating power source for devices have been actively conducted. In particular, lithium secondary batteries having high output and capacity to weight using lithium transition metal oxides, lithium composite oxides, etc. as a cathode active material have been greatly spotlighted. The lithium secondary battery has a structure in which an electrode assembly of a cathode, a separator, and a cathode is embedded in a sealed container together with an electrolyte.

On the other hand, the electrode generates a current through the exchange of ions, the positive electrode and the negative electrode constituting the electrode has a structure in which the electrode active material is applied to the electrode current collector made of a metal.

In general, the negative electrode has a structure in which a carbon-based active material is coated on an electrode plate made of copper or aluminum, and the positive electrode has a structure in which an active material made of LiCoO ₂ , LiMnO ₂ , LiNiO _2, or the like is coated on an electrode plate made of aluminum or the like. Is done.

In order to produce a positive electrode or a negative electrode, an electrode mixture including an electrode active material is coated on an electrode current collector made of a metal sheet long in one direction.

In addition, a roll press process, a slitting process, a notching process, a lamination process, or a folding process for manufacturing an electrode mostly uses a roll-to-roll processing. It refers to a process that can be subjected to the process of coating, printing, etc. while the two bendable metal foil or the like moves between the roller and the roller.

That is, for example, by unwinding the roll winding the flexible thin metal sheet-like material to supply the material, coating or printing the supplied material, and then rewinding and recovering the processed material from another roll. The way is.

However, in the prior art, in the process of transferring and processing an ultrathin such as a current collector, a phenomenon in which the ultrathin is curved due to the difference between the gap between the roll and the roll and the tension applied to the center and the edge of the ultrathin occurs.

If the curvature increases, the ultra-thin folding may occur in the subsequent transfer process or rolling process, and if the above problem occurs during the electrode manufacturing process, the subsequent process such as forming the electrode tab becomes impossible.

Therefore, it is necessary to develop a method for manufacturing an electrode to solve the above problems.

The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

The present invention is a unit electrode that can prevent the folding phenomenon due to the curvature at the edge portion of the ultra-thin by irradiating light with a predetermined energy or more to the ultra-thin during the transfer and processing of the ultra-thin metal in the roll-to-roll process and applying an electrostatic force to the ultra-thin To provide a method of manufacturing and a secondary battery prepared by the above method.

Therefore, in order to achieve the above object, the manufacturing method of the unit electrode according to the present invention is a roll-to-roll manufacturing method, comprising the steps of: (a) irradiating light to both ends of the ultrathin metal; (b) applying an electrostatic force to both ends of the ultrathin to which light is irradiated; It may include.

In addition, according to one embodiment of the present invention, (c) forming a coating layer by applying an electrode mixture containing an electrode active material on the ultra-thin; And (d) drying and rolling the ultrathin on which the coating layer is formed.

According to the present invention, the ultrathin can be charged by the photoelectric effect by irradiating light having a predetermined energy or more, and by applying an electrostatic force to the ultrathin irradiated with light, even if the curvature at the edge of the ultrathin occurs, In the process of the ultra-thin folding can prevent the phenomenon.

In this case, the wavelength of light irradiated on the ultrathin should be in a range having an energy equal to or greater than the work function (E = hν) for the raw material constituting the ultrathin. Since the electron is bound by the electric charge and electric force of the atomic nucleus at the ultrathin, the photon effect can occur when the energy of the photon irradiated is larger than the work function, and the ultrathin can be charged.

According to the present invention, when the width of each of both ends of the ultra-thin light is irradiated with 5% to 25%, the curvature improvement effect is preferable. More specifically, in the case of an electrode having a width of 1000 mm or less, it is more preferable to irradiate light to an area of 10% to 25% of the total ultrathin width, and in the case of an electrode having a width exceeding 1000 mm, depending on the width of the electrode. More preferably, light is irradiated to the region of 10% to 10%. Applicant's experiments showed that the curvature improvement effect was sufficient even if the electrode having a width exceeding 1000mm in the light irradiation only 10% or less area. However, if the width of the portion where light is irradiated in the ultra-thin is less than 5%, the area where the electrostatic force acts on the ultra-thin is difficult to achieve the desired effect, and the width of the portion where the light is irradiated is 25% of the total width of the ultra-thin If it exceeds, the range of force acting on the ultrathin may increase, and force may be applied to an unintended part, and may not achieve the original purpose of improving the curvature.

According to an embodiment of the present invention, the step (b) may be a step of applying the electrostatic force by being installed on one side or both sides of the ultrathin so as to face the opposite ends of the ultrathin charged or positively charged have.

At this time, the charged positively charged may be installed to be located inside the curved surface formed when the ultra-thin is curved. Since the portion of the metal ultrathin is irradiated with light by the photoelectric effect, the charged portion is charged to the positive side of the metal ultrathin, so the repulsive force acts on the ultrathin metal and pushes the curved portion to the inside of the curved surface. Can be improved.

On the contrary, the charged battery charged with negative charge may be installed to be located outside the curved surface formed when the ultrathin is curved. In this case, the bending phenomenon can be improved by pulling the curved portion by the attraction force to the metal ultrathin.

In addition, a battery may be installed on both surfaces as well as one side of the ultrathin metal. In this case, the charged battery may be located inside the curved surface, and the charged battery may be located outside of the curved surface.

With respect to the mother charged, the positively charged mother may be at least one selected from the group consisting of ferromagnetic, semi-ferromagnetic, negatively charged mother may be at least one selected from the group consisting of ferromagnetic, semi-ferromagnetic, the ferromagnetic Or the ferromagnetic material is preferably iron or nickel, but is not limited thereto.

The electrode may be disposed in parallel with the electrode sheet in a state spaced at intervals of 5 mm to 50 mm with respect to the metal ultrathin, and one or more may be installed with respect to the transfer direction of the metal ultrathin. When the distance between the charging body and the ultrathin metal is less than 5 mm, the contact between the charging pole and the ultrathin metal may cause an unexpected problem by damaging or indirectly causing the ultrathin metal, and when exceeding 50 mm, the force acting on the ultrathin metal decreases. It is difficult to achieve the desired effect.

The present invention also provides a battery cell including the unit electrode. The battery cell may have a structure in which an electrode assembly including two or more unit electrodes and a separator interposed between the unit electrodes is wound in a state in which the battery cell is embedded, and the lithium electrode is contained in the electrode assembly. It may have a structure in which the non-aqueous electrolyte solution is impregnated. The unit electrode may be an anode and / or a cathode.

In the present invention, the unit electrode may be manufactured by applying an electrode mixture containing an electrode active material on a current collector and then drying it. The electrode mixture may optionally further include a binder, a conductive material, a filler, and the like, as necessary. .

In the present invention, as the current collector, both ultrathin metal or ultrathin metal ultrathin can be used. In the case of the positive electrode current collector, it is generally made into a thickness of 3 to 500 mu m. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, tungsten or aluminum or stainless steel Surface treated with carbon, nickel, titanium, silver, and the like on the surface of may be used. The current collector may form fine irregularities on its surface to increase the adhesion of the positive electrode active material, and various shapes such as sheets, foils, and nets are possible.

In the case of the negative electrode current collector, it is generally made to a thickness of 3 to 500 μm. Such a negative electrode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, tungsten, calcined carbon, copper or stainless steel Surface-treated with carbon, nickel, titanium, silver and the like, aluminum-cadmium alloy and the like can be used. In addition, like the positive electrode current collector, fine concavities and convexities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as sheets, foils, and nets.

In the present invention, the positive electrode active material is a material capable of causing an electrochemical reaction, a lithium transition metal oxide, containing at least two transition metals, for example, lithium cobalt oxide (LiCoO ₂ substituted with one or more transition metals) ), Layered compounds such as lithium nickel oxide (LiNiO ₂ ); Lithium manganese oxide substituted with one or more transition metals; Formula LiNi _1-y M _y O ₂ , wherein M = Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn or Ga and comprises one or more of the above elements, wherein 0.01 ≦ _y ≦ 0.7 Lithium nickel-based oxide represented by; Li _{1 + z} Ni _1/3 Co _1/3 Mn _1/3 O ₂ , Li _{1 + z} Ni _0.4 Mn _0.4 Co _0.2 O _2, etc. Li _{1 + z} Ni _b Mn _c Co _{1- (b + c + d )} M _d O _(2-e) A _e (where -0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤0.8, 0≤d≤0.2, 0≤e≤0.2, b + c + d Lithium nickel cobalt manganese composite oxide represented by <1, M = Al, Mg, Cr, Ti, Si or Y, and A = F, P or Cl; Formula Li _{1 + x} M _{1-y M'y} PO _4-z X _z , wherein M = transition metal, preferably Fe, Mn, Co or Ni, M '= Al, Mg or Ti, X = Olivine-based lithium metal phosphate represented by F, S, or N, and represented by -0.5≤x≤ + 0.5, 0≤y≤0.5, and 0≤z≤0.1, etc., but is not limited thereto.

The negative electrode active material may be, for example, carbon such as hardly 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' Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen, 0 <x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; 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 , Metal oxides such as Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. The conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery. Examples of the conductive material include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal 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 bonding the active material and the conductive material to the current collector, and is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, poly Propylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for inhibiting the expansion of the electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery. Examples of the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.

Other components, such as viscosity modifiers, adhesion promoters, may optionally be further included or as a combination of two or more. The viscosity modifier is a component that adjusts the viscosity of the electrode mixture so that the mixing process of the electrode mixture and the coating process on the current collector thereof may be easy, and may be added up to 30% by weight based on the total weight of the negative electrode mixture. Examples of such viscosity modifiers include carboxy methyl cellulose, polyvinylidene fluoride, and the like, but are not limited thereto. In some cases, the solvent described above may serve as a viscosity modifier.

The adhesion promoter is an auxiliary component added to improve the adhesion of the active material to the current collector, it may be added in less than 10% by weight relative to the binder, for example, oxalic acid (adipic acid), adipic acid (adipic acid), Formic acid, acrylic acid derivatives, itaconic acid derivatives, and the like.

The separator is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally from 0.01 to 10 ㎛ ㎛, thickness is generally 5 ~ 300 ㎛. As such a separator, for example, olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets made of glass fibers or polyethylene, nonwoven fabrics, and the like are used. When a solid electrolyte such as a polymer is used as the electrolyte, the solid electrolyte may also serve as a separator.

The lithium salt-containing non-aqueous electrolyte solution consists of an electrolyte solution and a lithium salt, and a non-aqueous organic solvent, an organic solid electrolyte, an inorganic solid electrolyte, and the like are used as the electrolyte solution.

As the non-aqueous organic solvent, for example, N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethylsulfoxide, 1,3-dioxolon, formamide, dimethylformamide, dioxorone , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be used.

Examples of the organic solid electrolyte include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymerizers containing ionic dissociating groups and the like can be used.

Examples of the inorganic solid electrolytes include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides, sulfates and the like of Li, such as Li ₄ SiO ₄ -LiI-LiOH, Li ₃ PO ₄ -Li ₂ S-SiS ₂ , and the like, may be used.

The lithium salt is a good material to be dissolved in the non-aqueous electrolyte, for example, 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, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide.

In addition, in the electrolyte solution, for the purpose of improving the charge and discharge characteristics, flame retardancy, etc., for example, pyridine, triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide, nitro Benzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride and the like may be added. . In some cases, in order to impart nonflammability, halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics, and FEC (Fluoro-Ethylene) may be further included. Carbonate), PRS (Propene sultone) may be further included.

In one preferred example, lithium salts such as LiPF ₆ , LiClO ₄ , LiBF ₄ , LiN (SO ₂ CF ₃ ) _2, and the like, may be prepared by cyclic carbonate of EC or PC as a highly dielectric solvent and DEC, DMC or EMC as a low viscosity solvent. Lithium salt-containing non-aqueous electrolytes can be prepared by adding them to a mixed solvent of linear carbonates.

As described above, the manufacturing method of the unit electrode according to the present invention, in the roll-to-roll process, it is possible to improve the bending phenomenon of the ultrathin by the electrostatic force applied to the ultrathin metal charged by the photoelectric effect through which the subsequent rolling process It is possible to prevent the folding of the ultrathin in the back. This can reduce electrode defects and improve process efficiency. In addition, the electrode is less likely to be broken as compared with a process of mechanically correcting a bending phenomenon of the electrode.

1 is a flowchart illustrating a manufacturing process of a unit electrode according to an exemplary embodiment of the present invention.
2 is a schematic diagram showing a process of irradiating light to the ultra-thin and applying the electrostatic force to the ultra-thin according to an embodiment of the present invention.
Figure 3 is a vertical cross-sectional view showing a state in which the charge according to an embodiment of the present invention applies an electrostatic force to the ultra-thin.
Figure 4 is a vertical cross-sectional view showing a state in which the charge according to another embodiment of the present invention applies an electrostatic force to the ultra-thin.
5 is a schematic view showing an electrode manufacturing method according to an embodiment of the present invention.

Hereinafter, with reference to the drawings according to an embodiment of the present invention, but this is for the easier understanding of the present invention, the scope of the present invention is not limited thereto.

1 is a flowchart illustrating a manufacturing process of a unit electrode according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the method of manufacturing a unit electrode of the present invention includes: irradiating light to both ends 120 of the ultrathin metal 100 (S10); Applying an electrostatic force or a magnetic force to both ends 120 of the ultra-thin light (S20); Applying an electrode mixture including an electrode active material on the ultrathin 100 to form a coating layer 610 (S30); Drying and rolling the ultrathin on which the coating layer 610 is formed (S40); It includes.

FIG. 2 is a schematic diagram illustrating a process of irradiating light to ultra-thin and applying an electrostatic force to the ultra-thin according to an embodiment of the present invention in step S20 of FIG. Referring to FIG. 2, the metal ultrathin 100 is transferred by the roll 150, and light having a wavelength having an energy equal to or greater than a work function E = hν is irradiated to both ends 120 of the ultrathin. As the electron (e ⁻ ) is released from the ultrathin by the photoelectric effect, the ultrathin is charged with a positive charge. At this time, the width of each of the two ends 120 of the ultrathin corresponds to 5% to 25% of the total width of the ultrathin.

The ultra-thin 100 charged with the positive charge is placed on the charger 200 while being spaced apart on one or both sides of the ultra-thin battery (FIG. 3 only shows the charger located on one surface) by electrostatic attraction. Ultrathin curvature can be improved. There is no particular limitation on the shape or size of the charged body 200.

3 is a vertical cross-sectional view showing a state that the electrostatic force 200 is applied to the ultrathin according to an embodiment of the present invention. Referring to FIG. 3, a curvature phenomenon occurred in the ultrathin metal 100, and a charged electric charge 200 positively charged is spaced apart from one surface of the ultrathin 100 by opposing the opposite ends 120 of the ultrathin. Electrostatic force is applied. In FIG. 3, since the charged 200 charged with the positive charge has to apply the repulsive force 310 to the metal ultra-thin charged with the same positive charge, it is located on the inner side 300 of the curved surface so that both ends 120 of the ultra-thin are placed. Push out. There is no particular limitation on the size, shape or cross section of the charging body 200.

Figure 4 is a vertical cross-sectional view showing a state that the electrostatic force 200 is applied to the ultra-thin 100 according to another embodiment of the present invention. In FIG. 4, the charger 200 is charged with a negative charge. In this case, since the attraction force 410 is to be applied to the ultrathin 100, the charged battery 200 charged with the negative charge is located on the outer side 400 of the curved surface and pulls both end portions 120 of the ultrathin. Likewise, there are no special restrictions on the size, shape or cross section of the charging body.

5 is a schematic view showing a method of manufacturing a unit electrode according to an embodiment of the present invention. According to FIG. 5, the unit electrode of the present invention is manufactured by a roll-to-roll process, and the metal ultrathin 100 is wound on a feeding roll 510 for supplying ultrathin, and unrolled from the feeding roll 510 to be transported and rolled. Supplied to. The unwinded ultrathin is transported by one or more guide rolls 520, and an electrode mixture including an electrode active material and the like is applied by the electrode active material and the electrode mixture application device 600 including the same during the transfer process, thereby coating the layer 610. It is formed (S30). The ultra-thin coating layer formed is dried and rolled by the rolling roll 530 (S40), and then wound by the winding roll 540. Light is irradiated by one or more light irradiation apparatuses 700 during the ultrathin conveying process, and the charged material 200 is positioned on one or both surfaces of the ultrathin. The charger 200 may be charged with a positive charge or with a negative charge, may be located only on one surface of the ultrathin 100 (210), or may be located on both sides of the ultrathin (210). In addition, a battery may be installed in the rolling process and subsequent processes (not shown). Although only one light irradiation apparatus 700 is shown in FIG. 6, a plurality of light irradiation apparatuses may be installed along the process line to maintain both ends 120 of the ultrathin in a charged state during the electrode manufacturing process.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the following Examples are provided to illustrate the present invention and the scope of the present invention is not limited thereto.

Preparation of the electrode

<Example 1>

Copper foil with a width of 1000mm and a thickness of 10㎛ was used as the ultrathin, and the ultrathin was positively charged by irradiating light of 200nm wavelength to 20% of the area based on the ultrathin width, and the ultrathin curved surface along the ultrathin feed direction. On the inner side of, a positively charged nickel electrode was placed. The charger was placed at a point 20 mm away from the ultrathin.

Slurry slurry of carbon (electrode active material), Super-C (conductive material), CMC (carboxymethyl cellulose (aqueous solvent), distilled water, SBR (binder) mixture slurry was prepared as an electrode mixture applied during ultra-thin conveyance. After drying, rolling and winding were performed to prepare electrodes.

Comparative Example 1

Copper foil was used as the ultrathin, and the electrode was manufactured under the same conditions as in the example except that the ultrathin was not irradiated with light and the charged body was not disposed.

Evaluation method and result

100 electrodes prepared as described above were manufactured, and the frequency of bending occurred and the frequency of folding the ultrathin due to the bending in the rolling process was measured. The results are shown in Table 1 below.

Example 1 Comparative Example 1 Curve frequency 100 100 Folding frequency during roll-to-roll process 0 40 Defective rate 0% 40%

As shown in Table 1, the unit electrode manufacturing method according to the present invention, even when the ultra-thin curvature occurs, the curvature is improved by irradiation with light does not cause a folding phenomenon compared to the manufacturing method of the general electrode bar, the efficiency of the process It is possible to improve and manufacture electrodes of good quality.

Those skilled in the art to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above contents.

100: ultrathin metal
150: roll
120: both ends of the ultrathin
200: Daejeon
300: inside of the curved surface
310: repulsive force
400: outside of curved surface
410: repulsive force
510: Feeding Roll
520: guide roll
530: Rolled Roll
540: winding roll
600: electrode mixture coating device
700: light irradiation device

Claims (16)

In the method for manufacturing a roll-to-roll type unit electrode,
(a) irradiating light to both ends of the ultrathin metal;
(b) applying an electrostatic force to both ends of the ultrathin to which light is irradiated;
(c) applying an electrode mixture including an electrode active material on the ultrathin to form a coating layer; And
(d) drying and rolling the ultrathin on which the coating layer is formed;
Method for producing a unit electrode comprising a. The method of claim 1,
The wavelength of light irradiated in the step (a),
The method of manufacturing a unit electrode having a range of energy having a work function (E = hv) or more with respect to the raw material constituting the ultrathin. The method of claim 1,
The width of each of both ends of the ultra-thin light is irradiated is 5 to 25% of the total width of the ultra-thin unit electrode manufacturing method.
The method of claim 1,
When the width of the ultra-thin is less than 1000mm, the width of each of both ends of the ultra-thin light is irradiated is 10 to 25% of the total width of the ultra-thin unit electrode.
The method of claim 1,
When the width of the ultrathin exceeds 1000mm, the width of each of both ends of the ultrathin to be irradiated with light is 5 to 10% of the total width of the ultrathin. The method of claim 1,
The ultra-thin is a method of manufacturing a unit electrode that is a weak magnetic or non-magnetic metal. The method of claim 6,
The metal is a method for producing a unit electrode that is one selected from the group consisting of copper, aluminum, nickel, titanium, tungsten. The method of claim 1,
The step (b) is a unit electrode manufacturing method of applying a electrostatic force is installed in a state in which the charged charged with a positive or negative charge spaced apart on one side or both sides of the ultra-thin opposite to the opposite ends. The method of claim 5,
The positively charged battery is a manufacturing method of the unit electrode, it characterized in that it is installed to be located inside the curved surface formed when the ultra-thin is curved. The method of claim 5,
The negative electrode is charged with a charged electrode is a manufacturing method of the unit electrode, characterized in that installed so as to be located on the outside of the curved surface formed when the ultra-thin.
The method of claim 5,
The positively charged charger is at least one selected from the group consisting of a ferromagnetic material or a ferromagnetic material.
The method of claim 5,
The negatively charged charging member is a method of manufacturing a unit electrode of at least one selected from the group consisting of ferromagnetic or semi-ferromagnetic material.
The method according to claim 10 or 11,
The ferromagnetic or quasi-ferromagnetic material is a manufacturing method of a unit electrode that is iron or nickel.
The method of claim 5,
The electrode is a manufacturing method of a unit electrode, characterized in that arranged in parallel with the electrode sheet in a state spaced apart at intervals of 5 to 50mm with respect to the ultrathin metal.
The method of claim 5,
And at least one electrified body according to the ultra-thin conveying direction.
A secondary battery comprising at least two unit electrodes prepared according to claim 1, wherein an electrode assembly is wound in a state in which a separator is interposed between the unit electrodes.

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