KR102258829B1 - Electrode for lithium secondary battery with improved electric conductivity and method of manufacturing the same - Google Patents

Abstract

In the present invention, (S1) dispersing the active material, the conductive material and the binder polymer in a solvent to obtain a slurry; (S2) removing the solvent from the slurry; pulverizing the obtained electrode material; (S3) mixing the pulverized electrode material with PTFE to obtain an electrode powder; and (S4) placing the electrode powder on the current collector and then pressing with a rolling roll or pressing the pulverized electrode powder with a rolling roll to form a film and then attaching it to the current collector; Method of manufacturing an electrode for a lithium secondary battery comprising a As a result, since the conductive material is dispersed on the surface of the active material, the conductivity is improved, the content of the binder polymer covering the surface of the active material can be minimized, so the charge transfer resistance is low, and the electrode without migration of the binder polymer may be provided.

Description

Electrode for lithium secondary battery with improved electrical conductivity and method for manufacturing the same {Electrode for lithium secondary battery with improved electric conductivity and method of manufacturing the same}

The present invention relates to an electrode for a secondary battery having improved electrical conductivity and a method for manufacturing the same.

In general, a lithium secondary battery has a structure in which a lithium electrolyte is impregnated in an electrode assembly including a positive electrode, a negative electrode, and a separator including lithium transition metal oxide as an electrode active material.

In the lithium secondary battery electrode, it is preferable that a conductive material is uniformly dispersed between active materials in order to improve cycle characteristics and output characteristics of the battery. However, the conductive material generally has a particle size of only several tens of nanometers, and thus the conductive material tends not to be uniformly dispersed because the particle sizes of the active material and the conductive material show a very large difference.

As a method for manufacturing a lithium secondary battery electrode, there is a method for manufacturing by coating an electrode slurry on a metal foil, and an embodiment in which an active material, a conductive material, and a binder polymer are present in the electrode prepared in this way is schematically shown in FIG. have. As shown in FIG. 1 , in the electrode prepared from the electrode slurry, the binder polymer 20 surrounds the surface of the active material 10 in a slurry state, and a conductive material is attached to the surface of the active material 10 . In such an electrode, since the binder polymer surrounds the surface of the active material, the charge transfer resistance is high, and the cell performance is deteriorated due to the binder migration problem in the solvent drying process.

On the other hand, recently, not a slurry method using a solvent, but a method of manufacturing an electrode without a solvent by mixing an active material, a binder polymer, and a conductive material in a powder state is known. An embodiment in which the active material, the conductive material, and the binder polymer are present in the electrode thus manufactured is schematically illustrated in FIG. 2 . As shown in FIG. 2 , in the electrode manufactured by this method, the conductive material is preferentially aggregated, and the active material 10 and the binder polymer 20 ′ are distributed around it. The dispersibility of the conductive material tends to be more deteriorated, and the conductivity is low due to the aggregation of the conductive material, as well as the binder polymer layer is not formed on the surface of the active material, so the surface of the active material is more exposed to the electrolyte. There may be many side reactions such as reduction reactions. On the other hand, since the binder polymer does not cover the entire surface of the active material, charge transfer resistance is low and there is no solvent drying process, so there is no movement of the binder polymer.

Therefore, there is a need for an electrode manufacturing method capable of solving charge transfer resistance, binder polymer movement, and conductive material aggregation caused by the binder polymer.

It is an object of the present invention to provide an electrode for a lithium secondary battery having a high output in which loss of capacity or occurrence of overvoltage is prevented by improving electrical conductivity in the electrode.

Another object of the present invention is to provide an electrode for a lithium secondary battery capable of preventing a side reaction between an active material and an electrolyte without significantly increasing electrical resistance.

Other objects and advantages of the present invention will be understood by the following description. In addition, it will be readily apparent that the objects and advantages of the present invention can be realized by means or methods described in the claims, and combinations thereof.

According to an aspect of the present invention, (S1) dispersing an active material, a binder polymer and a conductive material in a solvent to obtain a slurry; (S2) removing the solvent from the slurry; pulverizing the obtained electrode material; (S3) mixing the pulverized electrode material with PTFE to obtain an electrode powder; and (S4) placing the electrode powder on the current collector and pressing with a rolling roll or pressing the pulverized electrode powder with a rolling roll to form a film and then attaching it to the current collector; A method of manufacturing an electrode for a lithium secondary battery comprising a is provided

In another embodiment of the present invention, the slurry of (S1) may further include a dispersant.

The dispersant may be an acrylic polymer or a cellulosic compound.

The dispersant may be included in an amount of 10% by weight or less based on the total weight of the solid powder constituting the electrode.

The binder polymer is vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HEP), polyvinylidene fluoride (polyvinylidenefluoride), polyacrylonitrile (polyacrylonitrile), polymethyl methacrylate (polymethylmethacrylate), poly Vinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, polyacrylic acid, ethylene-propylene-diene monomer (EPDM), alcohol One or a mixture of two or more selected from the group consisting of pononated EPDM, styrene butadiene rubber (SBR), fluororubber, polyacrylic acid, and a polymer or copolymer in which hydrogen is substituted with Li, Na or Ca have.

The binder polymer content may be 0.5 to 5 wt% based on the total solid content constituting the electrode active material layer.

The PTFE content may be 0.5 to 5 wt% based on the total solid content constituting the electrode active material layer.

The mixing in step (S3) may be shear mixing made at a speed of 10 to 500 rpm.

According to another aspect of the present invention, there is provided an electrode for a lithium secondary battery manufactured by the above-described manufacturing method, the active material surface is coated with a binder polymer, and the active materials are bonded by PTFE.

According to an aspect of the present invention, since the conductive material is dispersed on the surface of the active material, conductivity is improved.

In addition, since the binding force between the active materials can be maintained while the content of the binder polymer covering the surface of the active material is minimized, the side reaction between the active material and the electrolyte can be suppressed, the charge transfer resistance is low, and the binder polymer has no migration (migration) electrode this is provided

FIG. 1 schematically shows an embodiment in which a binder polymer covers the surface of an active material according to Comparative Example 1. Referring to FIG.
FIG. 2 schematically shows an embodiment in which the active material is bound by the binder polymer, but the surface of the active material is not coated with the binder polymer according to Comparative Example 2. FIG.
FIG. 3 schematically shows an embodiment in which the active material is bound by the binder polymer while minimizing the content of the binder polymer covering the surface of the active material according to an embodiment of the present invention.

The terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that there is. Therefore, the configuration shown in the embodiments and drawings described in this specification is only the most preferred embodiment of the present invention, and does not represent all of the technical spirit of the present invention, so they can be substituted at the time of the present application It should be understood that various equivalents and modifications may be made.

According to one aspect of the present invention, in an electrode comprising an active material, a binder polymer, PTFE and a conductive material, the surface of the active material is coated with a binder polymer, and an electrode for a lithium secondary battery in which binding between the active materials is provided by PTFE is provided. . At this time, PTFE is not included in the binder polymer covering the surface of the active material.

In the present invention, the electrode active material may be included in an amount of 90 to 97% by weight among the solids constituting the electrode active material layer.

The positive active material may be a lithium-containing transition metal oxide. As the lithium-containing transition metal oxide, 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) and _{Li x FePO 4 (0.5 <x} <1.3) , but are exemplified such as in It is not limited. The lithium-containing transition metal oxide may be coated with a metal such as aluminum (Al) or a metal oxide.

The negative electrode active material may include, for example, carbon such as non-graphitizable carbon and graphitic 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' : Al, B, P, Si, a group 1, 2, or 3 element of the periodic table, halogen; 0<x≤1;1≤y≤3; 1≤z≤8) metal complex oxide; lithium metal; lithium alloy; 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 , oxides such as Bi ₂ O _{5 ;} conductive polymers such as polyacetylene; Li-Co-Ni-based materials; Lithium titanium oxide such as Li ₄ Ti ₅ O _{12 may be used.}

The conductive material is included in the electrode active material layer in a form in which conductive material particles are coated or attached to the surface of the active material particles. In the conductive material, the shape of the particle is coated or attached to the surface of the electrode active material, and there is no need to be limited to any one particular shape as long as it has suitable properties. In one embodiment of the present invention, the shape of the particles may be spherical. Alternatively, the shape of the conductive material particles may be a similar spherical shape such as an oval, a rectangle or a square, an amorphous, needle-like, rod-like or plate-like, or fibrous particle that is difficult to specify a specific shape, but is not limited thereto.

In the present invention, since the conductive material is included in the active material layer in the form of being coated or attached to the surface of the positive electrode active material, aggregation of the conductive material can be prevented.

The conductive material used in the present invention is not particularly limited as long as it has excellent electrical conductivity and has conductivity without causing side reactions in the internal environment of the secondary battery or chemical change in the battery. Specifically, the conductive material may be a carbon-based material having high conductivity, but is not limited thereto. As the carbon-based material, graphene, graphite, carbon black, acetylene black, channel black, Ketjen black, furnace black, lamp black, and summer black may be used alone or a mixture of two or more thereof, but limited thereto it is not

The conductive material may be fine particles or granules having the longest particle diameter of a single particle in the range of 10 nm to 100 nm, preferably 20 nm to 70 nm. Alternatively, the conductive material may be an aggregate of the fine particles or granules, and the aggregate may be in the form of a powder. When the particle diameter of the conductive material is less than 10 nm, the conductive material is not uniformly dispersed in the electrode and excessively aggregated may occur. On the other hand, when the particle diameter of the conductive material exceeds 100 nm, a uniform and fine coating film is not well formed on the surface of the active material, so it may be difficult to exert the intended effect of the present invention.

The conductive material is included in an amount of 1 wt% to 10 wt%, preferably 1 wt% to 5 wt%, based on 100 wt% of the total electrode active material layer. When the content of the conductive material is less than the above-mentioned range, the predetermined conductivity cannot be secured. On the other hand, when the content of the conductive material exceeds the above-described range, there is a disadvantage in that the amount of the binder polymer is increased and the electrode resistance property is deteriorated.

In the present invention, as the binder polymer for coating the surface of the binder polymer, vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HEP), polyvinylidenefluoride, polyacrylonitrile, polyacrylonitrile, poly Methyl methacrylate, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, polyacrylic acid, ethylene- Propylene-diene monomer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluororubber, polyacrylic acid, and polymers in which hydrogen is substituted with Li, Na or Ca, or various copolymers Various types of binder polymers may be mentioned. In one embodiment of the present invention, the content of the binder polymer among the solids constituting the electrode active material layer may be about 1 to 20% by weight. Preferably, the content of the binder polymer may be 0.5 to 5% by weight.

In the present invention, polytetrafluoroethylene (PTFE) is used to form binding between active materials. Since PTFE has a property of stretching like a net when high shear is applied, bonding between active materials can be achieved even without using a solvent. This PTFE is added after pulverizing the electrode powder, and then high shear is applied so that the active materials are combined with each other. In one embodiment of the present invention, the PTFE content in the solids constituting the electrode active material layer may be about 1 to 20 wt%, preferably 0.5 to 5 wt%.

As shown in FIG. 3 , the active material, the conductive material, the binder polymer and the PTFE are the binder polymer 30 covering the surface of the active material 10 and the PTFE 30 ′ bonding the active materials 10 together, and the conductive material is It exists in the form in which the surface of an active material is coated or attached.

According to another aspect of the present invention, the active material, the conductive material, the binder polymer and, optionally, dispersing the dispersing material in a solvent to obtain a slurry; removing the solvent from the slurry; pulverizing the obtained electrode material; mixing the pulverized electrode material with PTFE to obtain an electrode powder; And after placing the electrode powder on the current collector, pressing with a rolling roll or pressing the pulverized electrode powder with a rolling roll to form a film and then attaching it to the current collector; A method of manufacturing an electrode for a lithium secondary battery comprising a. .

Regarding the active material, the conductive material, the binder polymer, and the dispersing material, the electrode manufacturing method of the present invention will be described below while referring to the above.

First, an active material, a conductive material, a binder polymer and, optionally, a dispersing material are dispersed in a solvent to obtain a slurry.

The solvent is N-methyl pyrrolidone (NMP), dimethylsulfoxide (DMSO), methyl alcohol (methyl alcohol), ethyl alcohol (ethyl alcohol), isopropyl alcohol (isopropyl alcohol) and water It may be any one selected from the group consisting of or a mixture of two or more thereof, but is not limited as long as it can be dispersed without causing a reaction with the electrode active material. In addition, the content of the solvent is preferably such that the solid content in the slurry is 70 to 90% in terms of improving the dispersibility and at the same time allowing the solvent to be easily dried in the subsequent procedure.

In the slurry of the present invention, an acrylic polymer or a cellulosic compound may be used as a dispersant. When an organic solvent is used as a solvent in the process of preparing the electrode powder, an acrylic polymer may be used as a dispersing material, and when water is used, carboxymethyl cellulose may be used.

More specifically, the acrylic polymer may be a saponified acrylic polymer, preferably a saponified poly(acrylic-acrylic acid) copolymer. As the saponifying agent of the acrylic polymer, an inorganic hydroxide such as NaOH (sodium hydroxide), KOH (potassium hydroxide), or LiOH (lithium hydroxide), or an organic anion, Amines such as triethanolamine (TEA), diisopropanolamine (DIPA), aminomethylpropanol (AMP-952), tromethamine, and tetrahydroxypropylethylenediamine can be used.

Examples of the cellulosic compound include carboxymethyl cellulose, carboxyethyl cellulose, and compounds in which these are substituted with cations such as ammonium ions and monovalent metal ions.

The dispersant is preferably included in an amount of 0 to 10 wt%, more preferably 0.5 to 2 wt%, based on the total weight of the solid powder constituting the electrode. Also, the pH of the dispersant may be in the range of 4 to 11.

Then, the solvent is removed from the slurry and the electrode material is ground.

Removal of the solvent may be performed by a method conventional in the art. For example, the solvent may be removed in an oven.

Then, a mixer is used for grinding the electrode material. For example, a roll-mill, a ball-mill (both wet and dry), a jet-mill, etc. may be mixed at a speed of 10 to 500 rpm for 10 minutes to 300 minutes. At this time, the process temperature is set to 20 to 60 °C. Thereby, an electrode material having a particle diameter of 100 nm to 50 m was obtained.

Then, a PTFE binder polymer is added to the pulverized electrode material to obtain an electrode powder.

As described above, since PTFE has a property of elongating like a net when high shear is applied, the active material can be bound only by mixing without a solvent using this.

For high shear mixing, for example, a roll-mill, a ball-mill (including both wet and dry), a jet-mill, etc. may be used, and 10 to 500 rpm at a speed of 10 to 500 rpm may be used. Shear mixing may be performed for minutes to 300 minutes. At this time, the process temperature is set to 20 to 60 °C.

Then, after the electrode powder is placed on the current collector, it is pressed with a rolling roll or the pulverized electrode powder is pressed with a rolling roll to form a film and then attached to the current collector.

The current collector may generally have a thickness of 3 μm to 500 μm, and is not particularly limited as long as it has high conductivity without causing a chemical change in the battery. For example, as the negative electrode current collector, stainless steel, aluminum, nickel, titanium, sintered carbon, or one in which the surface of aluminum or stainless steel is surface-treated with carbon, nickel, titanium, or silver, etc. may be used, and the positive electrode current collector may be used. A foil made of aluminum, nickel, or a combination thereof may be used, but the present invention is not limited thereto.

According to another aspect of the present invention, an electrochemical device including the above-described positive electrode, the negative electrode, and a separator interposed between the positive electrode and the negative electrode may be manufactured. The electrochemical device of the present invention includes all devices that undergo an electrochemical reaction, and specific examples include all kinds of primary batteries, secondary batteries, solar cells, or capacitors such as super capacitor devices. In particular, among the secondary batteries, a lithium secondary battery including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery is preferable.

In addition, the electrolyte that can be inserted between the electrode and the separator is a salt having the same structure as ^{A +} B ^{-, and A +} includes ions consisting of alkali metal cations such as ^{Li +} , Na ⁺ , K ^{+ or a combination thereof.} and B ^- 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 ^- A salt containing an anion or a combination thereof, such as propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), Dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethylmethyl carbonate (EMC), gamma butyrolactone (γ-butyrolactone) or those dissolved or dissociated by an organic solvent consisting of a mixture thereof, but is not limited thereto.

The electrolyte injection may be performed at an appropriate stage in the battery manufacturing process according to the manufacturing process and required physical properties of the final product.

As a process for applying the separator of the present invention to a battery, in addition to the general process of winding, lamination, stack, and folding processes of the separator and the electrode are possible.

The present invention also provides an electrochemical device including the anode. In addition to secondary batteries, the positive electrode according to the present invention is used in all kinds of primary cells, secondary cells, fuel cells, solar cells, or electrochemical devices operating by electrochemical reactions such as capacitors such as super capacitor devices. It is possible. In particular, among the secondary batteries, a lithium secondary battery including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery is preferable.

Hereinafter, examples will be given to describe the present invention in detail. However, the embodiments according to the present invention may be modified in various other 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 completely explain the present invention to those of ordinary skill in the art.

Example

Example 1: Anode Manufacturing

Per 100 parts by weight of the solid content constituting the positive active material layer, _{96.3 parts by weight of NCM622 (LiNi 0.6} Co _0.2 Mn _0.2 O ₂ ) as an active material, 1.5 parts by weight of carbon black as a conductive material, and 1.2 parts by weight of PVDF as a binder polymer N- A slurry was formed by dispersing in methyl pyrrolidone (NMP). The content of solids in NMP was set to 70%. The slurry was dried at 150° C. to completely remove NMP, and the electrode material was pulverized. Then, 1 part by weight of the PTFE binder polymer per 100 parts by weight of the positive electrode powder was mixed by applying high shear. Next, the prepared positive electrode powder was placed on an electrode current collector and pressed with a rolling roll to prepare an electrode.

comparative example 1: Anode Manufacturing

Per 100 parts by weight of the solid content constituting the positive active material layer, _{96.3 parts by weight of NCM622 (LiNi 0.6} Co _0.2 Mn _0.2 O ₂ ) as an active material, 1.5 parts by weight of carbon black as a conductive material, and 2.2 parts by weight of PVDF as a binder polymer A slurry was formed by dispersing in methyl pyrrolidone (NMP). The content of solids in NMP was set to 70%. The slurry was applied to an electrode current collector, dried NMP, and pressed with a rolling roll to prepare an electrode.

comparative example 2: Anode manufacturing

Per 100 parts by weight of solid content constituting the positive active material layer, _{96.3 parts by weight of NCM622 (LiNi 0.6} Co _0.2 Mn _0.2 O ₂ ) as an active material, 1.5 parts by weight of carbon black as a conductive material, 1 part by weight of PTFE and 1 part by weight of PVDF as a binder polymer A positive electrode powder was prepared by mixing parts by weight with high shear, and then, the prepared positive electrode powder was placed on a current collector and pressed with a rolling roll to manufacture an electrode.

evaluation example 1: Evaluation of charge transfer resistance

Unlike the increase in the charge transfer resistance in Comparative Example 1, there was no or insignificant increase in the charge transfer in Example 1.

evaluation example 2: Evaluation of binder polymer migration

Unlike the movement of the binder polymer in Comparative Example 1, there was no or little movement of the binder polymer in Example 1.

evaluation example 3: Conductivity evaluation

Unlike the decrease in conductivity in Comparative Example 2, there was no or insignificant decrease in conductivity in Example 1.

Claims (9)

(S1) dispersing an active material, a binder polymer and a conductive material in a solvent to obtain a slurry;
(S2) removing the solvent from the slurry; pulverizing the obtained electrode material;
(S3) mixing the pulverized electrode material with PTFE without a solvent to obtain an electrode powder; and
(S4) placing the electrode powder on the current collector and pressing it with a rolling roll, or pressing the pulverized electrode powder with a rolling roll to form a film and attaching it to the current collector,
The binder polymer is vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HEP), polyvinylidene fluoride (polyvinylidenefluoride), polyacrylonitrile (polyacrylonitrile), polymethyl methacrylate (polymethylmethacrylate), poly Vinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, polyacrylic acid, ethylene-propylene-diene monomer (EPDM), alcohol One or a mixture of two or more selected from the group consisting of polymers or copolymers substituted with ponylated EPDM, styrene butadiene rubber (SBR), fluororubber, polyacrylic acid, and their hydrogens with Li, Na or Ca A method of manufacturing an electrode for a lithium secondary battery, characterized in that.
According to claim 1,
The method of manufacturing an electrode for a lithium secondary battery, characterized in that the slurry in (S1) further comprises a dispersant.
3. The method of claim 2,
The dispersant is a method of manufacturing an electrode for a lithium secondary battery, characterized in that the acrylic polymer or cellulose compound.
3. The method of claim 2,
The method for manufacturing an electrode for a lithium secondary battery, wherein the dispersant is included in an amount of 10% by weight or less based on the total weight of the solid powder constituting the electrode.
delete In claim 1,
The binder polymer content is a method of manufacturing an electrode for a lithium secondary battery, characterized in that 0.5 to 5% by weight based on the total solid content constituting the electrode active material layer.
In claim 1,
The PTFE content is a method of manufacturing an electrode for a lithium secondary battery, characterized in that 0.5 to 5% by weight based on the total solid content constituting the electrode active material layer.
In claim 1,
(S3) A method of manufacturing an electrode for a lithium secondary battery, characterized in that the mixing in step is shear mixing made at a speed of 10 to 500 rpm.
An electrode for a lithium secondary battery manufactured by the manufacturing method according to any one of claims 1 to 4 and 6 to 8, the active material surface is coated with a binder polymer, and the active materials are bonded by PTFE.

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