KR20210019385A - Secondary battery having insulator for absorbing function - Google Patents

Abstract

Provided is a secondary battery including an insulator having a metal ion absorption function, wherein a metal ion is absorbed from an electrolyte, and moisture and HF that trigger explosions and fires are dramatically reduced, and thus battery explosion and fire can be prevented. The battery has a structure of at least three layers. A moisture and metal ion absorption layer that absorbs moisture and metal ions is located at the center thereof. An insulator composed of an HF and a metal ion absorption layer disposed on at least one side of the moisture and the metal ion absorption layer to absorb HF and metal ions is included. A moisture absorbent absorbs moisture by a chemical reaction, and the moisture absorbent is a metal oxide. The metal of the metal oxide is a metal from groups 2, 4, 10, 12, 13, and 14. The moisture and the metal ion absorption layer is formed by mixing a moisture absorbent and a metal ion absorbent with an insulating resin.

Description

Secondary battery including an insulator having an absorption function {Secondary battery having insulator for absorbing function}

The present invention relates to a secondary battery, and more particularly, to a secondary battery including an insulator having an absorption function for absorbing moisture, metal ions such as HF and Cu ²⁺ inside the secondary battery.

Lithium secondary batteries are energy sources with high energy density and high operating voltage and excellent storage and life characteristics, but are always exposed to explosions and fire accidents. Cell explosions are mainly caused by moisture, metals such as HF and Cu. The moisture or HF reacts with the electrolyte to increase the gas pressure inside the battery to inflate the battery. In particular, the HF may cause corrosion of the electrode. Metal ions, such as copper ions (Cu ²⁺ ), originate from fumes or powders such as copper (Cu) current collectors, electrode tabs, or lead tabs. As time passes, copper ions (Cu ²⁺ ) precipitate as copper (Cu) powder and grow gradually. When the copper (Cu) powder grows and increases in size, a short circuit may occur between electrodes passing through the separator, which may lead to explosion and fire. In addition, when the gas pressure inside the battery is increased or external pressure is applied, the separator is easily penetrated to cause an explosion and fire.

In order to prevent explosions and fires of lithium secondary batteries, it is necessary to reduce metal ions in the electrolyte and remove moisture and HF that trigger explosions and fires to the maximum. Accordingly, moisture, HF, and metal ions are correlated with the explosion and fire of the battery. Korean Patent Registration No. 10-1403383 proposes an insulating member that prevents the flow inside the battery in a jelly-roll type secondary battery and improves the stability by blocking power loss. However, not only the jelly-roll type secondary battery, but also the conventional secondary battery does not have a function of blocking moisture, HF, and metal ions, so that the explosion and fire of the battery cannot be fundamentally blocked.

The problem to be solved by the present invention is to provide a secondary battery including an insulator having an absorbing function that can prevent explosion or fire of the battery by absorbing metal ions in the electrolyte and dramatically reducing moisture and HF that trigger explosion and fire. To provide.

A secondary battery including an insulator having a metal ion absorbing function for solving the problem of the present invention has a structure of at least three layers, and a moisture and metal ion absorbing layer absorbing moisture and metal ions are located in the center, and the moisture and metal ion absorbing layer It is disposed on at least one side of the HF and includes an insulator made of a metal ion absorption layer. At this time, the moisture absorbent absorbs the moisture through a chemical reaction, the moisture absorbent is a metal oxide, and the metal of the metal oxide is a metal from groups 2, 4, 10, 12, 13 and 14, and the moisture and metal The ion absorbing layer is formed by mixing a moisture absorbing agent and a metal ion absorbing agent with an insulating resin.

In the battery of the present invention, the HF and metal ion absorbing layer may further include the moisture absorbing agent to form a moisture and HF and metal ion absorbing layer. The water absorbent is TiO ₂ , Al ₂ O ₃ , ZrO ₂ , ZnO, BaO, SrO, CaO, MgO, NiO, VO ₂ , CrO ₂ , MoO ₂ , SiO ₂ , SnO ₂ , CeO ₂ , Y ₂ O ₃ , V ₂ O ₅ , LiSrSiO ₄ , LiCaSiO ₄ , LiMn ₂ O ₄ , BaTiO ₃ , Cd ₂ SnO ₄ , CdIn ₂ O ₄ , Zn ₂ SnO ₄ , ZnSnO ₃ , Zn ₂ In ₂ O ₅ and (HfO ₂ )SrTiO ₃ It may be at least one selected from among. The metal ion absorbent is Aminopropyl, Bis[propy]ethane+ Mercaptopropyl, Carnosine, Cyclam, Dithiocarbamate, Imidazole, Mercaptopropyl, N-propylsalicyaidimine, Polyol, Propionate, Propylamine, Propyl ethylenediamine, Propyl diethylenetriamine, Pyoverdin, Tripropylamine, Salicylic acid, Amine and ester compound, ester compound of hydrazine and carboxylic acid, and ester compound of oxalic acid and amine, or a copolymer thereof. The metal ion absorbent may be Cyclam.

In the battery of the present invention, the insulating resin may be made of at least one selected from polyethylene, polypropylene, polybutylene, polystyrene, and polyethylene terephthalate. The insulator may be directly attached to or adjacent to any one of an electrode assembly, an electrode tab, a lead tab, a finishing tape, a gasket, and a battery cap. The secondary battery may be any one of a jelly roll, a stack cell, a winding cell, and a folding cell.

According to the secondary battery including the insulator having an absorption function of the present invention, by adopting an insulator that absorbs metal ions (for example, Cu ²⁺ ), it absorbs the metal ions in the electrolyte and triggers explosion and fire. HF can be drastically reduced to prevent battery explosion or fire.

1 is a perspective view showing an example of a secondary battery according to the present invention.
2 is a cross-sectional view for explaining a first insulator according to the present invention.
3 is a cross-sectional view for explaining a second insulator according to the present invention.
4 are photographs showing a state in which copper ions (Cu ²⁺ ) are adsorbed according to Examples and Comparative Examples of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below may be modified in various forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art. Meanwhile, in the drawings, the thicknesses of films (layers, patterns) and regions may be exaggerated for clarity. Also, when it is mentioned that a film (layer, pattern) is on, top, bottom, or one side of another film (layer, pattern), it can be formed directly on another film (layer, pattern) or A film (layer, pattern) may be interposed.

In the embodiment of the present invention, by adopting an insulator that absorbs metal ions (eg, Cu ²⁺ ), it absorbs metal ions in the electrolyte, and significantly reduces moisture and HF that trigger explosions and fires, thereby reducing battery explosion or fire. We present a secondary battery that can prevent To this end, the structure of a secondary battery in which an insulator absorbing metal ions (Cu ²⁺ ) is adopted will be described in detail, and a process of preventing explosion and fire of the secondary battery by the insulator will be described in detail. The embodiments of the present invention can be applied to all parts of a secondary battery that become a source for generating metal ions, and here, description will be made focusing on upper and lower insulators of a jelly-roll type secondary battery.

The secondary battery applied to the embodiment of the present invention may be applied regardless of shape such as jelly roll, stack cell, winding cell, folding cell type, and the like. In addition, the metal ion generation source includes a current collector, an electrode tab, and a lead tab, and the metal ions include copper ions (Cu ²⁺ ) and aluminum ions (Al ³⁺ ). Here, we will focus on the copper ion (Cu ²⁺ ) that has the greatest effect on the explosion and fire of the battery.

1 is a perspective view showing an example of a secondary battery 100 according to an embodiment of the present invention, and is expressed by cutting a central portion for convenience of explanation. However, the drawings are not represented in a strict sense, and there may be components not shown in the drawings for convenience of description.

Referring to FIG. 1, the secondary battery 100 is manufactured by accommodating an electrode assembly 10 in a case 20 and combining a cap assembly 30 having an electrode terminal formed on an upper end of the case 20. The electrode assembly 10 is formed by stacking an anode 11, a separator 12, and a cathode 13 and wound in a cylindrical shape. An electrolyte is filled in the case 20. A cylindrical center pin 40 is inserted in the center of the electrode assembly 10. The center pin 40 is made of a metal material to impart a predetermined strength, and has a hollow cylindrical structure in which a plate is bent in a round shape. The center pin 40 fixes and supports the electrode assembly 10 and is a passage through which gas generated inside the battery is discharged. The cap assembly 30 includes a positive electrode tab 31 and a cap plate 32. The positive electrode tab 31 is electrically connected to the top of the electrode assembly 10 and connected to the cap plate 32.

Meanwhile, a top insulator (TI) and a bottom insulator (BI) are attached to the top and bottom of the electrode assembly 10. The upper insulator TI is positioned between the electrode assembly 10 and the cap assembly 30, and the lower insulator BI is positioned between the electrode assembly 10 and the case 20. The upper and lower insulators (TI, BI) are based on insulating resin to secure insulation, absorb metal ions (Cu ²⁺ ), and reduce moisture and HF. Although not shown, the electrode assembly 10 is finished with a finishing tape, and the finishing tape also absorbs metal ions (Cu ²⁺ ) and reduces moisture and HF. This will be described in detail below.

2 is a cross-sectional view for explaining the first insulator 50 according to an embodiment of the present invention.

Referring to FIG. 2, the first insulator 50 has at least a three-layer structure, and a moisture and metal ion absorbing layer 51 is located at the center, and an HF and metal ion absorbing layer 52 is disposed outside the moisture and metal ion absorbing layer 51. ) Is attached. The moisture and metal ion absorbing layer 51 includes a moisture absorbent and a metal ion (Cu ²⁺ ) absorber in an insulating resin. If the HF and metal ion absorbing layer 52 is present on the outside, HF and metal ions generated inside the battery can be quickly removed. The insulating resin may be made of at least one selected from polyethylene, polypropylene, polybutylene, polystyrene, and polyethylene terephthalate. Preferably, the insulating resin is preferably the polypropylene.

The moisture absorbent is a material that removes moisture through a chemical reaction and is referred to as a chemical moisture absorbent. This is because the moisture absorbent that physically adsorbs will release the absorbed moisture again over time. In this case, the effect of substantially removing moisture is inferior. The chemical moisture absorbent removes moisture and oxygen through a chemical reaction such as hydrolysis or oxidation. The moisture absorbent includes an oxide containing a metal reactive to moisture, for example, a metal oxide of a Group 2-14 (IUPAC) metal. Preferably, the metal comprises metals from groups 2, 4, 10, 12, 13 and 14. For example, their metals can be selected from Al, Mg, Ba and Ca. It contains Ti, Zn, Sn, Ni, and Fe, and may also contain transition metals.

The water absorbent is TiO ₂ , Al ₂ O ₃ , ZrO ₂ , ZnO, BaO, SrO, CaO, MgO, NiO, VO ₂ , CrO ₂ , MoO ₂ , SiO ₂ , SnO ₂ , CeO ₂ , Y ₂ O ₃ , V ₂ O ₅ , LiSrSiO ₄ , LiCaSiO ₄ , LiMn ₂ O ₄ , BaTiO ₃ , Cd ₂ SnO ₄ , CdIn ₂ O ₄ , Zn ₂ SnO ₄ , ZnSnO ₃ , Zn ₂ In ₂ O ₅ and (HfO ₂ )SrTiO ₃ It may be at least one selected from among. The moisture absorbent removes moisture and oxygen by hydrolysis or oxidation. Conventional moisture absorbents have been proposed as inorganic materials, organic materials, or hybrid materials in which they are combined. However, conventional water absorbents do not have the technical idea of removing water by chemical reaction. The moisture absorbent of the present invention is based on the technical idea of absorption by a chemical reaction, and is not obtained by simple repeated experiments.

The HF absorbent may be any known one, and the HF absorbent may include lithium carbonate, sodium carbonate, calcium hydroxide, activated carbon, diatomaceous earth, perlite, zeolite, hydrotarcite, calcined hydrotalcite and hydrotalcite oxide. The HF absorbent is an organic substance such as examethyldisilazane, Tris(trimethylsilyl) phospite, Tris(pentafluorophenyl)borane, hexakis(2,2,2-trifluoroethoxy)cyclotriphosphazene, hexamethyl siloxane, N,N-diethylamino trimethylsilane, N,N-dicyclohexyl carbodiimide, (Trimethylsilyl)isothiocyanate, Lithium 2-trifluoromethyl-4,5-dicyanoimidazole, etc.

The moisture absorbent and the HF absorbent may be prepared by mixing a thermoplastic resin. The thermoplastic resin includes polyethylene, polypropylene, polybutylene, polystyrene, Teflon, and polyethylene terephthalate. The thermoplastic resin serves as a binder when mixing the moisture absorbent and the HF absorbent. That is, a mixture of the moisture absorbent, the HF absorbent, and the thermoplastic resin may be added to the insulating resin. In this case, the moisture absorbent and the HF absorbent may be uniformly dispersed in the insulating resin.

The metal ion (Cu ²⁺ ) absorber captures and absorbs the metal ion (Cu ²⁺ ). The metal ion (Cu ²⁺ ) absorbent is Aminopropyl, Bis[propy]ethane+ Mercaptopropyl, Carnosine, Cyclam, Dithiocarbamate, Imidazole, Mercaptopropyl, N-propylsalicyaidimine, Polyol, Propionate, Propylamine, Propyl ethylenediamine, Propyl diethylenetriamine, Pyoverdin, Tripropylamine, and It may consist of at least one of acid, amine and ester compound, ester compound of hydrazine and carboxylic acid, and ester compound of oxalic acid and amine, or a copolymer thereof. Preferably, the metal ion (Cu ²⁺ ) absorbent is preferably mixed with a polypropylene resin.

When considering the absorption rate of the metal ion (Cu ²⁺ ) absorbent according to an embodiment of the present invention, Cyclam is most preferred. The chemical formula of Cyclam (1,4,8,11-Tetraazacyclotetradecane) is C ₁₀ H ₂₄ N _4, and the two-dimensional and three-dimensional structures are as follows.

[2D structure]

[Three-dimensional structure]

At this time, the process of absorbing metal ions (Cu ²⁺ ) is as follows.

[Reaction Scheme]

In the Cyclam, four nitrogens form an unshared electron pair, and a metal ion (Cu ^{2 +} ) is coordinated and captured at the center. Of course, the aforementioned metal ion (Cu ^{2 +} ) absorber has a function of absorbing metal ions (Cu ²⁺ ), but the Cyclam, which captures metal ions (Cu ²⁺ ) by coordination, is more efficient.

The content of the metal ion (Cu ²⁺ ) absorbent is preferably 10 to 50% by weight based on the total weight of the first insulator 50. When the content of the metal ion (Cu ²⁺ ) absorbent is greater than 50% by weight, the amount of metal ion (Cu ²⁺ ) absorbed increases, but the amount of absorption capable of absorbing moisture and HF decreases. In addition, when the amount is greater than 50% by weight, the first insulator 50 in the form of a film has poor properties as a film, and the film is not properly formed, so that the insulating properties of the first insulator 50 are deteriorated. If the content is less than 10% by weight, the absorption of metal ions (Cu ²⁺ ) is small, so that the absorption function is not exhibited properly.

3 is a cross-sectional view for explaining a second insulator 60 according to an embodiment of the present invention. In this case, it is the same as the first insulator 50 except for the moisture, HF and metal ion absorbing layer 61 of the second insulator 60. Accordingly, a detailed description of the duplicated portion will be omitted.

Referring to FIG. 3, the second insulator 60 includes moisture and HF and metal ion absorbing layers 61 that absorb moisture, HF and metal ions on both sides of the moisture and metal ion absorbing layer 51 of the first insulator 50. It is an attached form. That is, the moisture and HF and metal ion absorbing layer 61 of the second insulator 60 has a function of absorbing moisture to the HF and metal ion absorbing layer 52 of the first insulator 50. The second insulator 60 is the metal ion absorber described above. The moisture absorbent and the HF absorbent have the same type and function as the first insulator 50. Including the moisture absorbent in the moisture, HF, and metal ion absorbing layer 61 increases moisture absorption.

In some cases, the insulator according to the embodiment of the present invention has a moisture and metal ion absorbing layer 51 at the center, an HF and metal ion absorbing layer 52 on one side, and a moisture and HF and metal ion absorbing layer 61 on the other side. It can be transformed into an arranged form. Here, an insulator in consideration of one moisture and metal ion absorbing layer 51 is presented, but a plurality of moisture and metal ion absorbing layers 51 are provided, and an HF and metal ion absorbing layer 52, a moisture and HF and metal ion absorbing layer ( 61) can be combined. As such, the insulator may be any one in consideration of absorption of moisture, HF, and metal ions according to the type of battery, type of battery, and type of metal ion generation source. In addition, the thickness of the insulator may also be set in consideration of absorption of moisture, HF, and metal ions according to the type of battery, type of battery, type of metal ion generation source, and the like.

<Example>

Hereinafter, examples are shown to describe the present invention in detail, but the present invention is not particularly limited to the following examples. In addition, physical properties and determination of secondary batteries shown in Examples and Comparative Examples represent values measured or determined by the following method. At this time, dimethyl carbonate and ethylene carbonate were mixed at a volume ratio of 1:1 as an electrolyte, and a non-aqueous electrolyte containing 1M LiPF ₆ as a lithium salt was used. Here, the first insulator 50 will be described.

1) Moisture and HF absorption

In order to measure moisture and HF, the first insulator 50 in the form of a film having a thickness of 200 μm was impregnated with the electrolyte, and then sealed to prevent moisture from entering the inside. Thereafter, the product was stored in a thermo-hygrostat at 60° C. for 5 days and then evaluated. The container used in the experiment is made of polypropylene. The reagent composition was controlled to have a moisture content of 10 ppm or less so as not to react with moisture in the atmosphere. The reagent composition was prepared in a glove box in which temperature and moisture content were constantly controlled, and moisture and HF in the electrolyte were measured. For moisture measurement, a meter of Metrohm's 915 KF Ti-Touch model was used, and for HF measurement, a potentiometric titrator of Metrohm's 916 Ti-Touch model was used.

2) Absorption of metal ions (Cu ²⁺ )

A copper specimen was attached on the specimen of the first insulator 50. A state in which copper ions (Cu ²⁺ ) in the copper specimen are adsorbed to the specimen of the first insulator 50 after leaving the weight on the specimen of the first insulator 50 for 30 days under the condition of a constant temperature bath at 120°C. Was confirmed.

<Example>

A first insulator 50 made of a water absorbing agent made of polypropylene resin and an absorbing layer 51 including a metal ion absorbing agent and an HF and metal ion absorbing layer 52 was prepared. The moisture absorbent was BaTiO ₃ having an average particle size of 5.5 μm, and the HF absorbing agent was lithium carbonate having an average particle size of 5.7 μm. The metal ion (Cu ²⁺ ) absorbent was Cyclam, and 20% by weight was mixed with respect to the total weight of the first insulator 50. The total absorbent was mixed with a polypropylene (PP) resin in a weight ratio of 3:7. Thereafter, a master batch was manufactured using KRC-Kneader S2 of Kurimoto Iron Works, and a 200 μm-thick first insulator 50 film was produced through an extruder. At this time, the extrusion conditions were set to be the same as the conditions for producing a conventional polypropylene film (temperature conditions 190 to 220°C, speed 10 to 40 m/min). The absorbed amounts of moisture, HF, and copper ions in the electrolyte were measured.

<Comparative Example>

In the absence of the first insulator 50 according to an exemplary embodiment of the present invention, moisture in the electrolyte and absorbed amounts of HF and copper ions were measured.

Table 1 compares the absorbed amounts of water, HF, and copper ions in the electrolyte solution according to Examples and Comparative Examples of the present invention.

division Moisture content (ppm) HF amount (ppm) Metal ion amount (ppm) Example 31.82 15.04 6.05 Comparative example 120.57 102.63 90.82

According to Table 1, according to the first insulator 50 according to the embodiment of the present invention, the amount of water, HF, and metal ions in the electrolyte were 31.82 ppm, 15.04 ppm, and 6.05 ppm, respectively. By the way, the amount of water, HF, and metal ions in the electrolytic solution of Comparative Example without the first insulator 50 were 120.57 ppm, 102.63 ppm, and 90.82 ppm, respectively. That is, the first insulator 50 drastically reduces the amount of water, HF, and metal ions in the electrolyte. The amount of water, HF, and metal ions in the electrolyte indirectly affects the explosion and fire of the battery. Increasing the gas pressure inside the battery promotes the growth of copper powder and penetration of the separator. In particular, when the content of HF increases, corrosion of the copper current collector causes the copper powder to precipitate and grow easily.

4 are photographs showing a state in which copper ions (Cu ²⁺ ) are adsorbed according to Examples and Comparative Examples of the present invention. At this time, in the above example, the first insulator 50 was used, and in the comparative example, a general polypropylene film containing no copper ion (Cu ²⁺ ) absorber was used. At this time, Example a and Comparative Example a show the absorption state of copper ions (Cu ²⁺ ) after 15 days, and Example b and Comparative Example b are copper ions (Cu ²⁺⁾ after 30 days have passed. ) Shows the absorption state.

4, copper ions (Cu ²⁺ ) were absorbed throughout the first insulator 50 according to the embodiment of the present invention. The first insulator 50 is to absorb the copper ion (Cu ^2+), it is possible to reduce significantly the copper ion (Cu ²⁺⁾ in the electrolyte. However, the polypropylene film of the comparative example did not absorb copper ions (Cu ²⁺ ), and corrosion occurred after 30 days. That is, when copper ions (Cu ²⁺ ) are deposited, as time passes, they precipitate as copper (Cu) powder and grow gradually. When the copper (Cu) powder grows and increases in size, a short circuit may occur between electrodes passing through the separator, which may lead to explosion and fire. In addition, when the gas pressure inside the battery is increased or external pressure is applied, the copper powder penetrates the separator, causing explosion and fire.

However, since the first insulator 50 according to the embodiment of the present invention absorbs copper ions (Cu ²⁺ ), precipitation of copper (Cu) powder does not occur easily. Since the first insulator 50 uniformly absorbs copper ions (Cu ²⁺ ) as a whole, copper (Cu) is not deposited in a powder form. That is, unlike the comparative example, the first insulator 50 does not deposit. If precipitation does not occur as copper (Cu) powder, explosion and fire caused by penetration of the separator due to the growth of copper (Cu) powder can be prevented.

The embodiments of the present invention have been described centering on the upper and lower insulators (TI, BI), but the first and second insulators 50 and 60 include a jelly roll, a stack cell, and a winding cell ( It can be applied to finishing tapes that fix electrode assemblies in winding cells and folding cells. In addition, the first and second insulators 50 and 60 may be applied to a gasket and a battery cap. That is, in addition to the upper and lower insulators TI and BI, the insulator of the present invention may be directly or adjacent to a portion serving as a source for providing metal ions. Adjacent attachment refers to attachment at a location capable of absorbing moisture, HF and metal ions, even if not directly attached.

Above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications are made by those of ordinary skill in the art within the scope of the technical idea of the present invention. It is possible.

10; Electrode assembly 20; case
30; Cap assembly 31; Anode tab
32; Cap plate 40; Center pin
50, 60; First and second insulator
51; Moisture and metal ion absorption layer
52; HF and metal ion absorbing layer
61; Moisture and HF and metal ion absorption layer

Claims (8)

It has at least a three-layer structure, and a moisture and metal ion absorbing layer for absorbing moisture and metal ions is located at the center, and is disposed on at least one side of the moisture and metal ion absorbing layer to include an insulator consisting of HF and metal ion absorbing layer,
The moisture absorbent absorbs the moisture through a chemical reaction, the moisture absorbent is a metal oxide, and the metal of the metal oxide is a metal from groups 2, 4, 10, 12, 13 and 14, and the moisture and metal ion absorbing layer A secondary battery comprising an insulator having an absorption function, characterized in that the silver moisture absorber and the metal ion absorber are mixed with an insulating resin. The secondary battery of claim 1, wherein the HF and metal ion absorbing layer further comprises the moisture absorbing agent to form a moisture, HF, and metal ion absorbing layer. The method of claim 1, wherein the water absorbent is TiO ₂ , Al ₂ O ₃ , ZrO ₂ , ZnO, BaO, SrO, CaO, MgO, NiO, VO ₂ , CrO ₂ , MoO ₂ , SiO ₂ , SnO ₂ , CeO ₂ , Y ₂ O ₃ , V ₂ O ₅ , LiSrSiO ₄ , LiCaSiO ₄ , LiMn ₂ O ₄ , BaTiO ₃ , Cd ₂ SnO ₄ , CdIn ₂ O ₄ , Zn ₂ SnO ₄ , ZnSnO ₃ , Zn ₂ In ₂ O ₅ and (HfO ₂ ) A secondary battery comprising an insulator having an absorption function, characterized in that at least one selected from SrTiO ₃ . The method of claim 1, wherein the metal ion absorbent is Aminopropyl, Bis[propy]ethane+ Mercaptopropyl, Carnosine, Cyclam, Dithiocarbamate, Imidazole, Mercaptopropyl, N-propylsalicyaidimine, Polyol, Propionate, Propylamine, Propyl ethylenediamine, Propyl diethylenetriamine, Pyoverdin, Tripropylamine, Secondary battery comprising an insulator having an absorption function, characterized in that consisting of at least one of salicylic acid, amine and ester compound, ester compound of hydrazine and carboxylic acid, and ester compound of oxalic acid and amine, or a copolymer thereof. The secondary battery according to claim 4, wherein the metal ion absorbent is Cyclam. The secondary battery according to claim 1, wherein the insulating resin comprises at least one selected from polyethylene, polypropylene, polybutylene, polystyrene, and polyethylene terephthalate. The secondary battery of claim 1, wherein the insulator is directly attached to or adjacent to any one of an electrode assembly, an electrode tab, a lead tab, a finishing tape, a gasket, and a battery cap. . The insulator of claim 1, wherein the secondary battery is any one of a jelly roll, a stack cell, a winding cell, and a folding cell. Secondary battery comprising a.

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