KR101872309B1 - Electrode for Secondary Battery Having Coating Layer of Preventing Combustion and Secondary Battery Comprising the Same - Google Patents

Abstract

The present invention relates to a secondary battery electrode coated with an electrode mixture containing an electrode active material on a current collector, comprising: a metal base as a current collector; And an ignition inhibiting coating layer that is locally coated on one or both surfaces of the metal substrate and includes an oxygen absorbent that absorbs oxygen derived from the electrode active material and has a relatively lower electrical conductivity than the metal substrate, An electrode for a secondary battery is provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode for a secondary battery including an ignition inhibiting coating layer and a secondary battery including the same.

The present invention relates to an electrode for a secondary battery, and more particularly, to an electrode for a secondary battery including an ignition inhibiting coating layer containing an oxygen absorbent for absorbing oxygen derived from an electrode active material and suppressing ignition.

A rechargeable secondary battery is widely used as an energy source for wireless mobile devices. In addition, the secondary battery is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (HEV), and the like, which are proposed as solutions for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels (Plug-in HEV) and the like.

In a small mobile device, one to four battery cells are used per device. In contrast, a middle- or large-sized device such as an automobile uses a battery module in which a plurality of battery cells are electrically connected to each other due to the necessity of a high output large capacity.

Preferably, the battery cells are manufactured in a small size and weight as possible, a prismatic secondary battery which can be charged with a high degree of integration and a small weight per unit capacity, and a pouch- And is mainly used as a battery cell.

However, such secondary batteries contain various combustible materials, and thus have a disadvantage in safety due to the risk of overheating, overcurrent, other physical external impact, and the like, resulting in heat generation and explosion.

For example, when the needle member is pierced, pressed or impacted, excessive current flows due to contact between the electrode active material and the current collector, short-circuiting heat is generated, and the cathode material and the negative electrode material are collapsed by the short- Thereby further raising the internal temperature.

Various methods have been tried, such as reducing the short-circuit current by increasing the electrode resistance or incorporating a flame-retardant substance into the electrode mixture. However, when the resistance of the electrode mixture is directly increased, the output characteristic is lowered, And the capacity characteristics are deteriorated.

Therefore, there is a high need for a technique that can easily and efficiently suppress ignition and secure the safety of the secondary battery, without directly increasing the resistance of the electrode.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

Specifically, it is an object of the present invention to provide a method for manufacturing a battery, which includes an oxygen absorbent that absorbs oxygen derived from an electrode active material, thereby locally coating an ignition inhibiting coating layer for suppressing ignition on one surface or both surfaces of the metal substrate as a current collector, And the ignition and explosion are suppressed even when the temperature of the cell rises.

It is an object of the present invention to provide an electrode assembly and a secondary battery including the electrode for the secondary battery and having improved thermal stability.

In order to achieve this object, a secondary battery electrode according to the present invention comprises:

1. An electrode for a secondary battery, comprising: a current collector coated with an electrode mixture containing an electrode active material,

A metal substrate as a current collector; And

An ignition inhibiting coating layer that is locally coated on one or both surfaces of the metal substrate and includes an oxygen absorbent that absorbs oxygen derived from the electrode active material and has a relatively lower electrical conductivity than the metal substrate;

And is characterized by comprising:

That is, the electrode for a secondary battery according to the present invention prevents ignition or explosion due to an internal short-circuit by an ignition-inhibiting coating layer locally formed on one surface or both surfaces of the current collector.

Generally, an electrode for a secondary battery is manufactured by applying an electrode mixture to a current collector. When an electrode active material included in an electrode mixture is brought into contact with a counter electrode current collector due to an external impact, a high temperature, etc., A short circuit occurs.

Since the electrode active material is decomposed by the generated short circuit heat, a large amount of oxygen is generated, and the electrolyte and other combustible materials are burned. As a result, the electrode for the secondary battery has a risk of ignition or fire due to external impact, needle penetration,

Accordingly, the electrode for a secondary battery according to the present invention includes an ignition inhibiting coating layer including an oxygen absorbent that absorbs oxygen generated as the active material is decomposed, thereby instantaneously blocking the generation of oxygen, thereby suppressing ignition, Improves thermal safety.

The electrode active material is divided into a cathode active material contained in the anode and a cathode active material included in the cathode. Lithium metal oxide and lithium metal phosphate are generally used as the cathode active material. Examples of the anode active material include carbon and graphite materials, lithium metal, Lithium alloy, lithium metal oxide, or the like is used.

Specifically, the electrode active material may be a lithium metal oxide capable of intercalating and deintercalating lithium ions.

These lithium metal oxides can store and release lithium ions contained in the electrolyte. As the charging potential increases, the capacity of the battery increases, but the structural safety of the compound decreases.

In addition, the internal temperature of the cell rises as the charge / discharge progresses. Particularly, when a short circuit is generated due to an external impact or the like, the internal temperature of the cell sharply increases, and the structure of the active material is collapsed to generate a large amount of oxygen. The generated oxygen reacts with the electrolytic solution constituting the cell and other inflammable substances, and there is a risk of causing a fire.

In order to prevent such a risk, the secondary battery electrode according to the present invention is coated on one or both surfaces of the current collector with an ignition inhibiting coating layer containing an oxygen absorbent for absorbing oxygen derived from the active material.

More specifically, the lithium metal oxide may be a lithium transition metal oxide including at least one element selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn).

The lithium transition metal oxide may be, for example, a layered compound such as lithium cobalt oxide (LiCoO ₂ ) or lithium nickel oxide (LiNiO ₂ ) substituted with one or more transition metals; Lithium manganese oxides substituted with one or more transition metals; Formula _{LiNi 1-y M y O 2} ( where, M = Co, Mn, Al , Cu, Fe, Mg, B, Cr, Zn or Ga and Lim, 0.01≤y≤0.7 include one or more elements of the element) A lithium nickel-based oxide represented by the following formula: _{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 , such as _{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 <1, M = Al, Mg, Cr, Ti, Si or Y, and A = F, P or Cl; lithium nickel cobalt manganese composite oxide; , But the present invention is not limited to these.

Meanwhile, the electrode material mixture may include a conductive material, a binder, a filler, and the like in addition to the electrode active material for the purpose of improving the conductivity and improving the binding power.

In one specific example, the electrode mix may comprise a conductive material.

Such a conductive material is usually added in an amount of 1% by weight to 30% by weight based on the total weight of the electrode mixture, and a conductive material is used without causing a chemical change in the battery.

For example, graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used. Concrete examples of commercially available conductive materials include acetylene black series such as Chevron Chemical Company, Denka Singapore Private Limited, Gulf Oil Company, etc.), Ketjenblack, EC (Armak Company), Vulcan XC-72 (Cabot Company), and Super P (Timcal).

Such a conductive material improves the conductivity of the electrode mixture layer. In the case of the electrode for a secondary battery according to the present invention, since the oxygen absorbent is not included in the electrode mixture, dispersion of the conductive material in the electrode mixture slurry can be further facilitated.

That is, although not particularly limited, the electrode for a secondary battery according to the present invention does not contain an oxygen absorbent in the electrode mixture slurry but contains a conductive material, so that the conductivity of the electrode material mixture layer can be kept high.

The binder is a component that assists in binding of the active material to the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30 wt% based on the total weight of the electrode material mixture.

Non-limiting examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene Ethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, and various copolymers.

The filler is optionally used as a component for suppressing the expansion of the electrode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery.

Such fillers include, for example, oligomer-based polymers such as polyethylene and polypropylene; Fibrous materials such as glass fiber, carbon fiber and the like can be used.

As described above, the electrode material mixture containing the conductive material, the binder, and the filler in combination with the electrode active material and dispersed in the solvent is applied to one surface or both surfaces of the current collector to be an electrode for a secondary battery.

The current collector is generally formed to a thickness of 3 to 500 탆, and is not particularly limited as long as it is conductive without causing chemical changes in the battery, but is preferably a metal base excellent in malleability .

The metal substrate as the current collector may be, for example, stainless steel, aluminum, nickel, titanium, sintered carbon, or a surface of aluminum or stainless steel surface-treated with carbon, nickel, titanium or silver.

In addition, it is possible to form fine irregularities on the surface of the metal substrate to increase the adhesive force with the electrode mix layer, and various forms such as films, sheets, foils, nets, porous bodies, foams and nonwoven fabrics can be used. In one specific example , The metal substrate may be a metal foil.

That is, although the shape of the metal substrate is not particularly limited, it is preferably used in the form of a thin metal plate so that the ignition restraining coating layer can be easily formed. It is needless to say that the irregularities can be formed on the metal foil so as to improve the adhesive force between the current collector and the electrode mixture layer.

The electrode for a secondary battery according to the present invention locally coating an ignition inhibiting coating layer containing an oxygen absorbent that absorbs oxygen derived from the electrode active material before coating the electrode mixture on such a metal substrate to improve safety.

The oxygen absorbent may be any one or a mixture of two or more selected from the group consisting of saccharides and polyalkylene glycols.

The saccharides include polysaccharides composed of pentose and / or hexose, and the polyalkylene glycols are polyalkylene glycols having 1 to 6 carbon atoms, specifically, polyethylene glycol, ethylene vinyl alcohol, and polyvinyl alcohol Or the like.

As described above, this oxygen absorbent absorbs oxygen generated by collapsing the structure of the active material due to an internal short circuit, thereby preventing a fire.

On the other hand, since the above-mentioned oxygen absorbent is included, the ignition inhibiting coating layer has a relatively lower conductivity than the electrode mixture layer or the current collector.

Therefore, in the electrode for a secondary battery according to the present invention, the ignition inhibiting coating layer is locally formed on the metal substrate, and in one specific example, the ignition inhibiting coating layer is coated with a coating in the range of 1% to 50% .

If the area of the low-conductivity anti-fog coating layer exceeds 50%, it is difficult for the metal substrate to function as a current collector. When the area is less than 1%, it is difficult to obtain effects such as improvement of thermal stability due to ignition inhibition Which is undesirable.

For the same reason, the ignition restraining coating layer may be specifically coated in the range of 5% to 45%, more specifically in the range of 10% to 40%.

The shape of the ignition restraining coating layer locally formed on the metal substrate may be formed to be deflected toward one side of the metal substrate, but it is preferable that the shape is uniformly distributed in a constant pattern in order to secure uniform conductivity on the current collector Do.

That is, on the metal substrate, the non-ignition portion in which the ignition-inhibiting coating layer is not formed and the coating portion in which the ignition-inhibiting coating layer is formed may have a repeated pattern.

In the case where the non-igniter portion and the coating portion do not have a repetitive pattern shape as described above, current may accumulate in the igniter portion where the ignition restraining coating layer is not formed, and heat may be generated. , Which is undesirable.

As a specific example of such a pattern shape, the metal base has a rectangular shape in a planar shape. The metal base may have a rectangular shape with a constant width in the vertical direction, the horizontal direction, or the diagonal direction with respect to the long side of the rectangular metal base, May be alternately arranged to form a pattern shape.

As another specific example, the ignition restraining coating layer may have a pattern shape by alternately arranging the igniter and the coating portion radially from the center of the metal base.

As another specific example, the coating portion may have a polygonal or circular planar structure, and a plurality of coating portions may be arranged at regular intervals to form a pattern shape.

The pattern shape of this ignition restraining coating layer will be described in detail later.

On the other hand, the thickness of the ignition restraining coating layer is not particularly limited, but it may be 100 nm to 1 탆, and the surface shape may be in the form of a film having a uniform thickness or in the form of a cluster having a non- .

Among these, the cluster-type ignition-inhibiting coating layer has a high specific surface area, so that it is possible to provide an excellent adhesion force between the current collector and the electrode mixture layer rather than the film-type ignition inhibition coating layer.

In addition, the anti-ignition coating layer may include a binder polymer that improves the adhesion between the current collector and the electrode mixture.

Such a binder polymer may be contained in an amount ranging from 1% by weight to 30% by weight of the solid content of the slurry forming the ignition inhibiting coating layer, and may be the same compound as the binder polymer contained in the electrode mixture described above, but is not particularly limited thereto.

As described above, the ignition inhibiting coating layer containing the oxygen absorbent and selectively containing the binder polymer may be formed on one surface or both surfaces of the metal substrate as the current collector, and is preferably formed on both surfaces.

The ignition inhibiting coating layer may be formed, for example, by dispersing an oxygen absorbing agent and a binder polymer material in a predetermined volatile solvent to prepare a coating liquid, pattern coating the coating liquid on the metal substrate, and drying the coating liquid. Examples of the volatile solvent include NMP, water, methyl isobutyl ketone, and isopropanol, but are not limited thereto.

When the coating layer is formed in a cluster type by adjusting the concentration and the solvent of the coating solution for forming the ignition retardation coating layer, the coating layer has fine irregularities having a predetermined surface roughness, so that the bonding strength with the electrode mixture layer can be further improved.

The electrode for a secondary battery according to the present invention may be an anode and / or a cathode. That is, the anti-fog coating layer formed on the metal substrate may be applied to either the positive electrode or the negative electrode, and may be applied to both the positive electrode and the negative electrode.

The present invention also provides an electrode assembly comprising a plurality of electrodes and a separator for electrically insulating adjacent electrodes interposed between the electrodes, wherein the electrode assembly comprises at least one electrode for a secondary battery according to claim 1, Thereby providing an electrode assembly.

Each of the electrodes includes:

A metal substrate as a current collector; And

An ignition inhibiting coating layer that is locally coated on one or both surfaces of the metal substrate and includes an oxygen absorbent that absorbs oxygen derived from the electrode active material and has a relatively lower electrical conductivity than the metal substrate;

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In other words, all of the electrodes constituting the electrode assembly may include an ignition-inhibiting coating layer. However, the present invention is not limited thereto, and in some cases, the outermost electrodes may be vulnerable to internal short- Therefore, it is preferable to include the above-described ignition inhibiting coating layer.

The present invention also provides a battery pack comprising at least one or more of a secondary battery and the secondary battery, wherein the electrode assembly is embedded in the battery case with the electrolyte solution impregnated therein.

Wherein the battery pack includes a plurality of secondary batteries, and at least one secondary battery among the plurality of secondary batteries located at the center of the plurality of secondary batteries includes:

A metal substrate as a current collector; And

An ignition inhibiting coating layer that is locally coated on one or both surfaces of the metal substrate and includes an oxygen absorbent that absorbs oxygen derived from the electrode active material and has a relatively lower electrical conductivity than the metal substrate;

And an electrode including the electrode.

That is, in the case of a battery pack including a plurality of secondary batteries, as the charging / discharging progresses, heat accumulates and the temperature of the secondary battery located at the central portion may rise excessively, It is preferable to include an ignition inhibiting coating layer containing an oxygen absorbent.

In this case, it is needless to say that the secondary batteries located at the central portion may include electrodes including the ignition-inhibiting coating layer, or the secondary batteries included in the battery pack may include electrodes including the ignition-inhibiting coating layer.

The present invention also provides a device comprising the battery pack.

Specific examples of the device include not only small devices such as a mobile phone, a tablet computer, a notebook computer, a wearable device and the like, but also a power tool powered by an electric motor; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and the like; An electric motorcycle including an electric bike (E-bike) and an electric scooter (E-scooter); An electric golf cart; Power storage systems, and the like.

As described above, the electrode for a secondary battery according to the present invention includes an ignition inhibiting coating layer having a relatively lower conductivity than a metal base material and pattern-coated with an oxygen absorbent that absorbs oxygen derived from the collapse of the structure of the electrode active material It is possible to improve the safety by suppressing ignition or explosion while maintaining predetermined conductivity without deteriorating the characteristics of the electrode and the electrode material mixture slurry and to increase the contact area with the current collector, The adhesive force between the composite layer and the current collector is improved.

1 is a cross-sectional view schematically showing an electrode for a secondary battery according to an embodiment of the present invention;
Fig. 2 is a perspective view schematically showing a current collector having a firing inhibiting coating layer formed in a vertical direction with respect to a long side as a specific example of the current collector shown in Fig. 1; Fig.
3 is a plan view schematically showing the current collector shown in Fig. 2; Fig.
FIG. 4 is a plan view schematically showing a current collector in which an ignition restraining coating layer is formed in a horizontal direction on the basis of a long side as another specific example of the current collector shown in FIG. 1; FIG.
FIG. 5 is a plan view schematically showing a current collector formed with an ignition restraining coating layer in which a non-coated portion and a coated portion are alternately arranged in a rectangular radial shape from the center, as another specific example of the current collector shown in FIG. 1;
FIG. 6 is a plan view schematically showing a current collector in which an ignition restraining coating layer is pattern-coated in a hexagonal radial pattern, as another concrete example of the current collector shown in FIG. 1; FIG.
7 is a plan view schematically showing a current collector in which an ignition restraining coating layer is pattern-coated in a quadrangle, as another specific example of the current collector shown in Fig. 1; And
8 is a plan view schematically showing a current collector in which a spark-ignition inhibiting coating layer is circularly pattern-coated as another specific example of the current collector shown in Fig.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 1 is a schematic cross-sectional view of an electrode for a secondary battery according to an embodiment of the present invention.

Referring to FIG. 1, an electrode assembly for a secondary battery 100 includes electrode assemblies 110 including electrode active materials on both sides of a current collector 120. In some cases, the electrode assembly 110 may be formed on only one surface of the current collector 120, or may include an electrode assembly uncoated portion 120 'on both surfaces of which the electrode assembly 110 is not formed.

On both sides of the conductive metal substrate 121 constituting the current collector 120, an ignition inhibiting coating layer 130 including an oxygen absorbing agent is included. The ignition inhibiting coating layer 130 may be formed on only one side of the current collector Of course.

On the other hand, the electrode mixture uncoated portion 120 'having no electrode mixture 110 is not required to secure conductivity with the active material layer, and there is a possibility of an internal short circuit. Therefore, desirable.

On the other hand, in order to ensure a predetermined conductivity, the ignition-inhibiting coating layer 130 is locally coated on the metal substrate 121 at a portion where the electrode assembly 110 is coated. Hereinafter, the ignition inhibiting coating layer 130 The coating shape will be described in more detail.

Figs. 2 and 3 schematically show a perspective view and a plan view of a current collector in which a spark-protector coating layer is formed in a vertical direction with respect to a long side as a specific example of the current collector shown in Fig.

Referring to these drawings, the current collector 120 includes an ignition inhibiting coating layer 130 in the form of a pattern formed in a direction perpendicular to a long side of a rectangular metal base 121.

Specifically, the ignition restraining coating layer 130 has a structure in which a coated portion 132 coated with a non-coated portion 134 is alternately arranged in a linear shape with a predetermined width.

3, the coating portion 132 and the non-coated portion 134 are linearly alternated in the vertical direction with respect to the long side of the metal base 121, but the present invention is not limited thereto.

Fig. 4 schematically shows a plan view of a current collector in which an ignition restraining coating layer is formed horizontally with respect to a long side as another specific example of the current collector shown in Fig.

Referring to FIG. 4 together with FIG. 3, unlike FIG. 3, the anti-ignition coating layer 130 of FIG. 4 has a pattern formed in a direction parallel to a long side of the metal substrate 121.

As described above, the non-coated portion and the coated portion may be alternately arranged in a straight line, and the forming direction is not particularly limited as long as uniformity of conductivity can be secured as a whole.

5 and 6 schematically show plan views of a current collector in which an ignition restraining coating layer in which a non-coated portion and a coated portion are alternately arranged radially is formed as another concrete example of the current collector shown in FIG. 1 .

5, the ignition restraining coating layer 130 of the current collector 120 has a pattern shape formed by alternately arranging the non-coated portion and the coated portion in a rectangular radial shape from the central portion 131 of the metal substrate 121. [

6, the ignition restraining coating layer 130 of the current collector 120 is formed by alternately arranging the igniter and the coating portion in a hexagonal radial pattern from a plurality of central portions 131, 133, 135, 137 on the metal base 121, Thereby forming a pattern shape.

Figs. 7 and 8 schematically show plan views of current collectors in which the ignition restraining coating layer is pattern-coated in a quadrangular and circular pattern as another specific example of the current collector shown in Fig.

Referring to these drawings, the anti-fog coating layer 130 of the current collector 120 has a uniform pattern of coating portions arranged at predetermined intervals.

In FIG. 7, the rectangular coating portions 132a are spaced apart to form a pattern. In FIG. 8, the circular coating portions 132b are spaced apart to form a pattern.

As described above, the ignition restraining coating layer may be formed in various shapes on the metal substrate, and it is preferable that the ignition inhibiting coating layers are arranged at regular intervals to ensure uniform overall conductivity.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (19)

1. An electrode for a secondary battery in which an electrode mixture containing an electrode active material is coated on a current collector,
A metal substrate as a current collector; And
An ignition inhibiting coating layer that is locally coated on one or both surfaces of the metal substrate and includes an oxygen absorbent that absorbs oxygen derived from the electrode active material and has a relatively lower electrical conductivity than the metal substrate;
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The oxygen absorbent is a saccharide,
The surface shape of the anti-ignition coating layer is in the form of a cluster having a non-uniform thickness,
The anti-ignition coating layer is coated in a range of 10% to 50% based on the total surface area of the metal substrate
Wherein the electrode is made of a metal. The electrode for a secondary battery according to claim 1, wherein the electrode active material is a lithium metal oxide capable of intercalating and deintercalating lithium ions. The secondary battery according to claim 2, wherein the lithium metal oxide is a lithium-transition metal oxide including at least one element selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn) electrode. The electrode for a secondary battery according to claim 1, wherein the electrode mixture contains a conductive material. The electrode for a secondary battery according to claim 1, wherein the metal base is a metal foil. delete delete The electrode for a secondary battery according to claim 1, wherein the non-ignition portion having no ignition inhibiting coating layer and the coating portion having the ignition inhibiting coating layer formed thereon have a repetitive pattern shape. [9] The method of claim 8, wherein the metal substrate has a rectangular shape in a plan view, and the non-solid portion and the coating portion in the vertical direction, the horizontal direction, or the diagonal direction with respect to the long side of the rectangular metal substrate are alternately Wherein the first electrode layer and the second electrode layer are patterned. The electrode for a secondary battery according to claim 8, wherein the non-coated portion and the coated portion are alternately arranged radially from the center of the metal substrate to form a pattern. The electrode for a secondary battery according to claim 8, wherein the coating portion has a polygonal or circular plane structure, and a plurality of coating portions are arranged at regular intervals to form a pattern. The secondary battery electrode according to claim 1, wherein the ignition inhibiting coating layer comprises a binder polymer that improves adhesion between the current collector and the electrode mixture. The electrode for a secondary battery according to claim 1, wherein the electrode is an anode and / or a cathode. An electrode assembly comprising a plurality of electrodes and a separator interposed between the electrodes to electrically isolate adjacent electrodes, the electrode assembly comprising at least one electrode for a secondary battery according to claim 1. delete The secondary battery according to claim 14, wherein the electrode assembly is embedded in the battery case with the electrolyte solution impregnated therein. A battery pack comprising at least one secondary battery according to claim 16. The battery pack according to claim 17, wherein the battery pack includes a plurality of secondary batteries, and at least one secondary battery among the plurality of secondary batteries,
A metal substrate as a current collector; And
An ignition inhibiting coating layer that is locally coated on one or both surfaces of the metal substrate and includes an oxygen absorbent that absorbs oxygen derived from the electrode active material and has a relatively lower electrical conductivity than the metal substrate;
And an electrode including the electrode. A device comprising a battery pack according to claim 17.

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