KR101628189B1 - Frame Retardant Compound Particle and Secondary Battery Comprising the Same - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to a flame-retardant compound particle and a secondary battery comprising the same. More particularly, the present invention relates to a flame-retardant compound particle and a shell comprising as a core a coating containing a substance which disappears at a predetermined temperature ≪ / RTI >

Description

FIELD OF THE INVENTION [0001] The present invention relates to a flame retardant compound particle and a secondary battery including the same,

The present invention relates to a flame-retardant compound particle and a secondary battery comprising the same.

As technology development and demand for mobile devices are increasing, the demand for batteries as energy sources is rapidly increasing, and accordingly, a lot of researches on batteries capable of meeting various demands have been conducted. In particular, there is a high demand for lithium secondary batteries, such as lithium ion batteries and lithium ion polymer batteries, which are excellent in energy density, discharge voltage, and output stability.

Generally, a lithium secondary battery is manufactured by impregnating a positive electrode / separator / negative electrode assembly manufactured by using a lithium transition metal oxide or a composite oxide as a positive electrode active material and a carbonaceous material as a negative active material into an electrolyte solution containing a lithium salt .

However, a lithium secondary battery using a lithium-transition metal oxide or a composite oxide has a problem in that when the battery is stored at a high temperature in a fully charged state, the metal component is detached from the positive electrode of the battery and is placed in a thermally unstable state. For example, the oxygen released from the anode accelerates the exothermic decomposition reaction of the electrolyte solution solvent, causing a so-called swelling phenomenon in which the battery is swollen. As a result, the battery life and charging / discharging efficiency are rapidly lowered The battery is deteriorated and the safety of the battery is greatly reduced.

Accordingly, a technique for suppressing the decomposition of the electrolyte by forming a protective coating on the negative electrode by decomposing the compound in the initial charge-discharge process by adding a specific sulfonimide compound to the electrolyte solution in order to suppress the swelling phenomenon during high temperature storage There is one. As described above, the techniques for suppressing the swelling phenomenon at the time of high-temperature storage are mainly composed of a method of adding a flame-retardant compound as a specific compound to an electrolytic solution.

However, due to the characteristics of the flame-retardant compound, which is generally unstable in electrochemical activity, the addition of such a flame-retardant compound has a problem of significantly deteriorating the battery characteristics.

Therefore, it is possible to secure the safety of the battery by solving the above problems such as the swelling phenomenon by suppressing the decomposition of the electrolytic solution in a state of high temperature or electric short, while maintaining the overall performance of the battery at the voltage or the temperature of the general battery operating range There is a high need for technology.

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.

It is an object of the present invention to provide a flame retardant compound particle having no deterioration in the battery characteristics and a secondary battery comprising the same.

Accordingly, in a non-limiting example of the present invention, the compound particles are characterized by comprising a coating containing a substance as a core, which is a flame-retardant compound particle and a shell, which disappears at a predetermined temperature.

When the flame-retardant compound particles are enclosed in a film, deterioration of the battery characteristics can be prevented. When the film is heated to a predetermined temperature, the film disappears due to melting or swelling. As a result, The swelling phenomenon and the like can be suppressed, so that the safety of the battery is greatly improved. When the coating disappears, the coating can be destroyed after the particles have increased in volume by a factor of ten or burst or burst without increasing the volume. As the coating disappears, flame retardant substances and gases in the coating film are discharged, thereby improving the safety of the battery at high temperatures.

The flame retardant compound may be at least one selected from the group consisting of a halogen flame retardant compound, a phosphorus flame retardant compound, and an inorganic flame retardant compound.

The halogen-based flame retardant compound may be at least one selected from the group consisting of tetra-propo bisphenol-A (TBA), deca-promoddyl phenyl ether (DBDPE), and chlorinated paraffin (TCP).

The phosphorus flame retardant compound may be at least one selected from the group consisting of a phosphate ester flame retardant compound, a halogen halogen phosphate ester flame retardant compound, a non-halogenated condensation phosphorus flame retardant compound, a polyphosphate flame retardant compound, and a flame retardant compound.

The phosphorus flame retardant compound may be selected from the group consisting of triphenyl phosphate (TPP), trixylenyl phosphate (TXP), tricresyl phosphate (TCP), triisophenyl phosphate (REOFOS) Tris-chloroethylphosphate (TCEP), tris-chloroprophylphosphate (TCPP), resorcinyl diphenyl phosphate (RDP), phenyl diresorcinyl phosphate, Cresyl diphenyl phosphate, Xylenyl diphenyl phosphate, phenyl di (isopropylphenyl) phosphate, and oligomers or polyphosphates having a dimer or more thereof And the like.

The inorganic flame retardant compound may be at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc borate, molybdenum compound, antimony trioxide and antimony pentoxide.

The coating may comprise a thermoplastic resin.

Since the film is made of a thermoplastic resin, when the battery reaches a certain temperature, the film may melt or swell and disappear.

The thermoplastic resin may be selected from the group consisting of polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), polyacrylonitrile (PAN), styrene- acrylonitrile (SAN), acrylonitrile- But may be at least one selected from the group consisting of butadiene-styrene (ABS), polymethylmethacrylate (PMMA), polytetrafluoroethylene (PTFE), and polychlorotrifluoroethylene (PCTFE).

The coating may comprise a vanadium compound.

Wherein the vanadium compound is selected from the group consisting of vanadium (II) chloride, vanadium (III) chloride, vanadium tetrachloride, vanadium (II) bromide, vanadium (III) bromide, vanadium tetrabromide, vanadium (II) iodide, vanadium III) < / RTI > iodide.

The coating may be a high polymer of a thermoplastic resin and a vanadium compound.

By forming a high polymer by using a vanadium compound as a polymerization additive in the film-forming thermoplastic resin, it is possible to obtain an effect of improving overall physical properties through crosslinking.

The core may further include a foaming agent.

By including a foaming agent in the core, the reaction rate and diffusion can be controlled.

The blowing agent may be selected from the group consisting of azodicarbonamide (ADCA), azobisisobutyronitrile (AZDN), N, N'-dimethyl-N, N'- dinitrosoterephthalate N, N'-dinitroso-terephthalate (NTA), 4,4'-oxybis Sulfonylhydrazide, 1,1-azobisformamide (ABFA) - (Azodicarbonamide), p-toluene, and the like. (P-toluenesulfonylsemicarbazide), barium azodicarboxylate (BaAC), and the like.

The thickness of the coating film is not particularly limited, but may be in the range of 1 탆 or more to 10 탆 or less, specifically, in the range of 2 탆 or more to 5 탆 or less. When the thickness is less than 1 탆, the thickness is too thin, and the film is easily torn by the flame retardant compound in the film. On the other hand, if it is more than 10 탆, it takes a long time for the film to disappear at a predetermined temperature because the thickness is too thick, so that it takes a long time for the flame retardant compound in the film to exhibit the flame retarding effect Bar, battery safety is a problem.

The temperature at which the material contained in the coating disappears may be varied depending on the molecular weight and thickness of the coating film and the type and content of the foaming agent and may be in the range of 60 ° C or higher to 300 ° C or lower, Lt; 0 > C to 270 < 0 > C.

The present invention can also provide a battery characterized by comprising the above-described compound particles.

The compound particles may be contained in at least one selected from the group consisting of an electrolyte, an electrode, and a separation membrane. Specifically, the compound particles may be used as a support layer material of the SRS separation membrane, or may be mixed with a coating layer formed on the surface of the electrode active material or electrode .

The present invention also provides a battery pack including the battery and a device using the battery pack as a power source.

Specific examples of such a device include a small device such as a computer, a mobile phone, a power tool, 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, but are not limited thereto.

As described above, the compound particles according to the present invention include a film containing a substance which is extinguished at a predetermined temperature as a core, as a flame retardant compound particle, and as a shell, Since the compound is surrounded by the film, deterioration of the battery characteristics due to the flame retardant compound can be prevented. In addition, when the battery reaches a predetermined temperature, the film disappears due to melting or swelling. As a result, the flammable compound particles can suppress the swelling phenomenon at a predetermined temperature or more, .

As described above, the compound particle according to the present invention is characterized in that it comprises, as a core, a flame-retardant compound particle and a shell, which contains a substance which disappears at a predetermined temperature.

The present invention also provides a battery comprising the compound particles.

The battery may include a positive electrode, a negative electrode, and an electrode assembly having a polymer membrane interposed between the positive electrode and the negative electrode in a battery case, and may include a non-aqueous electrolyte containing a lithium salt.

Generally, the positive electrode is prepared by applying an electrode mixture, which is a mixture of a positive electrode active material, a conductive material and a binder, on a positive electrode collector, followed by drying. If necessary, a filler may be further added to the mixture.

The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ and Cu ₂ V ₂ O ₇ ; Formula _{LiNi 1 - x M x O 2} ( where, the M = Co, Mn, Al, Cu, Fe, Mg, B or Ga, x = 0.01 ~ 0.3 Im) Ni site type lithium nickel oxide which is represented by; Formula _{LiMn 2 - x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 ~ 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); A lithium manganese composite oxide having a spinel structure represented by LiNi _x Mn _{2 - x} O ₄ ; LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ , and the like, but is not limited thereto.

The cathode current collector generally has a thickness of 3 to 500 mu m. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery. Examples of the positive electrode current collector include stainless steel, aluminum, nickel, titanium, sintered carbon, aluminum or stainless steel A surface treated with carbon, nickel, titanium, silver or the like may be used. The current collector may have fine irregularities on the surface thereof to increase the adhesive force of the cathode active material, and various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric are possible.

The conductive material is usually added in an amount of 1 to 50 wt% based on the total weight of the mixture including the cathode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial 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.

On the other hand, the graphite based material having elasticity may be used as a conductive material, and may be used together with the materials.

The binder is a component that assists in bonding of the active material to the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 50 wt% based on the total weight of the mixture containing the cathode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

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

The present invention also provides a secondary battery comprising the electrode, wherein the secondary battery may be a lithium ion battery, a lithium ion polymer battery, or a lithium polymer battery.

The lithium secondary batteries generally include an anode, a cathode, a separator interposed between the anode and the cathode, and a non-aqueous electrolyte containing a lithium salt. Other components of the lithium secondary battery will be described below.

The negative electrode is manufactured by applying, drying and pressing an anode active material on an anode current collector, and may optionally further include a conductive material, a binder, a filler, and the like as described above.

The negative electrode active material may include, for example, carbon such as non-graphitized carbon or graphite carbon; Li _x Fe ₂ O ₃ (0 _{≤ x ≤} 1), Li _x WO ₂ (0 _{≤ x ≤} 1), Sn _x Me _{1 - x} Me _y O _z (Me: Mn, Fe, Pb, , B, P, Si, Group 1, Group 2 and Group 3 elements of the periodic table, Halogen, 0 <x <1> 1 <y> 3, 1 <z <8); Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{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, and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials; Titanium oxide; Lithium titanium oxide and the like can be used, and in particular, a carbon-based material and / or Si can be included.

The negative electrode current collector is generally made to have a thickness of 3 to 500 mu m. Such an anode current collector is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, and examples of the anode current collector include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, a surface of copper or stainless steel A surface treated with carbon, nickel, titanium, silver or the like, an aluminum-cadmium alloy, or the like can be used. In addition, like the positive electrode collector, fine unevenness can be formed on the surface to enhance the bonding force of the negative electrode active material, and it can be used in various forms such as films, sheets, foils, nets, porous bodies, foams and nonwoven fabrics.

The separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 mu m, and the thickness is generally 5 to 300 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

The lithium salt-containing nonaqueous electrolyte is composed of a nonaqueous electrolyte and lithium. Nonaqueous organic solvents, organic solid electrolytes, inorganic solid electrolytes, and the like are used as the nonaqueous electrolyte, but the present invention is not limited thereto.

Examples of the non-aqueous organic solvent include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, methyl pyrophosphate, ethyl propionate and the like can be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, A polymer containing an ionic dissociation group and the like may be used.

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

The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide.

The lithium salt-containing non-aqueous electrolyte may further contain, for the purpose of improving charge / discharge characteristics, flame retardancy, etc., for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride, etc. May be added. In some cases, halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride may be further added to impart nonflammability. In order to improve the high-temperature storage characteristics, carbon dioxide gas may be further added. FEC (Fluoro-Ethylene Carbonate, PRS (Propene sultone), and the like.

In one specific _{example, LiPF 6, LiClO 4, LiBF} 4, LiN (SO 2 CF 3) 2 , such as a lithium salt, a highly dielectric solvent of DEC, DMC or EMC Fig solvent cyclic carbonate and a low viscosity of the EC or PC of And then adding it to a mixed solvent of linear carbonate to prepare a lithium salt-containing non-aqueous electrolyte.

The present invention provides a battery module including the secondary battery as a unit cell, a battery pack including the battery module, and a device including the battery pack as a power source.

At this time, specific examples of the device include a power tool that is powered by an electric motor and moves; 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; And a power storage system, but the present invention is not limited thereto.

In the following Examples, Comparative Examples and Experimental Examples, the contents of the present invention will be described in more detail, but the present invention is not limited thereto.

&Lt; Example 1 >

An anode slurry was prepared by using carbon as an anode active material, carbon black as a conductive material, SBR and CMC as a binder, applying a slurry on a 10 μm Cu foil, drying and rolling the anode slurry.

A Ni-rich NMC composite oxide as a cathode active material, carbon black as a conductive material, PVdF as a binder, TPP (flame retardant) and AZDN (foaming agent) as a core, and PAN A positive electrode slurry was prepared by using flame retardant particles having a diameter of about 10 μm and a slurry was coated on a 15 μm Al foil, dried and rolled to prepare a positive electrode. The core shell flame retardant compound used 2 wt% of the cathode active material (active material, conductive material, binder, flame retardant compound).

In addition, the functional organic-inorganic composite porous separator used in this example was coated on both sides with a thickness of 5 μm on a 12 μm thick PE fabric using Al ₂ O ₃ as an inorganic material and PVdF-HFP copolymer as a binder.

An anode, a cathode, and an organic-inorganic composite porous separator were assembled to prepare a 1500-megawatt polymer lithium secondary battery, and an electrolytic solution was injected thereinto.

&Lt; Example 2 >

Carbon black as a conductive material, SBR and CMC as a binder, TPP (flame retardant) and AZDN (foaming agent) as cores, and PAN having a thickness of about 3 μm as a shell An anode slurry was prepared using 10 μm particles of flame retardant compound, and a slurry was coated on 10 μm Cu foil, dried and rolled to produce a cathode. The core shell flame retardant was used in an amount of 2 wt% of the negative electrode active material (active material, conductive material, binder, flame retardant compound).

A positive electrode slurry was prepared using Ni rich NMC composite oxide as a cathode active material and PVdF as a binder, and a slurry was coated on the 15 μm Al foil and rolled to prepare a positive electrode.

In addition, the organic-inorganic composite porous separator was coated on both sides with a thickness of 5 μm on a 12 μm-thick PE fabric using Al ₂ O ₃ as an inorganic material and PVdF-HFP copolymer as a binder.

An anode, a cathode, and an organic-inorganic composite porous separator were assembled to prepare a 1500-megawatt polymer lithium secondary battery, and an electrolytic solution was injected thereinto.

&Lt; Comparative Example 1 &

Except that a Ni-rich NMC composite oxide was used as a cathode active material, a positive electrode slurry was prepared using PVdF as a binder, and a slurry was coated on a 15 μm Al foil and rolled to prepare a positive electrode. An anode, a cathode, and an organic-inorganic composite porous separator were assembled to fabricate a 1500-megawatt polymer lithium-ion secondary battery, and an electrolyte solution was injected thereinto.

&Lt; Comparative Example 2 &

A lithium secondary battery was fabricated by using a negative electrode, a positive electrode and a separator in the same manner as in Comparative Example 1 except that 1 wt% of TPP (flame retardant) was added as an electrolyte additive.

&Lt; Comparative Example 3 &

A lithium secondary battery was assembled by using a negative electrode, a positive electrode and a separator in the same manner as in Comparative Example 1 except that 3 wt% of TPP (flame retardant) was added as an electrolyte additive.

&Lt; Comparative Example 4 &

A lithium secondary battery was assembled by using a negative electrode, a positive electrode and a separator in the same manner as in Comparative Example 1 except that 5 wt% of TPP (flame retardant) was added as an electrolyte additive.

<Experimental Example 1>

The capacities of the lithium secondary batteries of Examples 1 and 2 and Comparative Examples 1 to 4 were measured for respective discharge rates, and the results are shown in Table 1 below.

<Experimental Example 2>

The high-temperature safety tests of the lithium secondary batteries of Examples 1 and 2 and Comparative Examples 1 to 4 were performed. In the test, the temperature was raised from room temperature to 150 ° C at a rate of temperature increase of 5 ° C / min. After maintaining the temperature for about 1 hour, the temperature was raised to 200 ° C when not ignited and the ignition temperature was measured. .

As can be seen from Table 1, in the case of manufacturing the battery using the anode and cathode produced according to the present invention, compared with the conventional method using only the flame-retardant compound, The battery characteristics are not deteriorated.

As can be seen from Table 2, when the battery was manufactured using the cathode and the anode manufactured according to the present invention, the battery had a higher ignition temperature and better battery safety than the conventional method using no flame-retardant compound.

Taking Tables 1 and 2 together, it can be seen that the battery according to the present invention has excellent cell safety, and has almost no deterioration in battery characteristics.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (23)

As a battery,
The battery includes a positive electrode, a negative electrode, and an electrode assembly having a polymer membrane interposed between the positive electrode and the negative electrode,
As the core, flame retardant compound particles; And
1. A shell, comprising: a film comprising a material that extinguishes at a predetermined temperature;
Wherein the coating layer is contained in a coating layer formed on the surface of the electrode, the flame-retardant compound particles having a thickness in a range of 1 占 퐉 to 10 占 퐉. The battery according to claim 1, wherein the flame retardant compound is at least one selected from the group consisting of a halogen flame retardant compound, a phosphorus flame retardant compound, and an inorganic flame retardant compound. [3] The battery according to claim 2, wherein the halogen-based flame retardant compound is at least one selected from the group consisting of tetrapropyl bisphenol-A (TBA), deca-promoteddiphenyl ether (DBDPE) and chlorinated paraffin (TCP). The phosphorus flame retardant compound according to claim 2, wherein the phosphorus flame retardant compound is selected from the group consisting of a phosphate ester flame retardant compound, a halide phosphoric ester flame retardant compound, a non-halogen condensate phosphorus flame retardant compound, a polyphosphate flame retardant compound, Or more. The phosphorous flame retardant compound according to claim 2, wherein the phosphorus flame retardant compound is selected from the group consisting of triphenyl phosphate (TPP), trixylenyl phosphate (TXP), tricresyl phosphate (TCP), triisophenyl phosphate Triisophenyl phosphate, REOFOS, Tris-chloroethylphosphate (TCEP), tris-chloroprophylphosphate (TCPP), resorcinyl diphenyl phosphate (RDP), phenyldisorcinylphosphate (Phenyl diisopropyl phenyl) phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, phenyl di (isopropylphenyl) phosphate, Or more oligomer or polyphosphate. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt; The battery according to claim 2, wherein the inorganic flame retardant compound is at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc borate, molybdenum compound, antimony trioxide and antimony pentoxide. The battery according to claim 1, wherein the film comprises a thermoplastic resin. The method of claim 7, wherein the thermoplastic resin is selected from the group consisting of polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), polyacrylonitrile (PAN), styrene- acrylonitrile And at least one selected from the group consisting of acrylonitrile-butadiene-styrene (ABS), polymethylmethacrylate (PMMA), polytetrafluoroethylene (PTFE), and polychlorotrifluoroethylene (PCTFE) Battery. The battery according to claim 1, wherein the film contains a vanadium compound. The method of claim 9, wherein the vanadium compound is selected from the group consisting of vanadium (II) chloride, vanadium (III) chloride, vanadium tetrachloride, vanadium (II) bromide, vanadium (III) bromide, vanadium tetrabromide, vanadium (iodide), and vanadium (III) iodide. The battery according to claim 1, wherein the coating is a high polymer of a thermoplastic resin and a vanadium compound. The battery according to claim 1, wherein the core further comprises a foaming agent. The method of claim 12, wherein the blowing agent is selected from the group consisting of azodicarbonamide (ADCA), azobisisobutyronitrile (AZDN), N, N'-dimethyl-N, N'-dinitrosoterephthalate (N, N'-Dimethyl-N, N'-dinitroso-terephthalate, NTA), 4,4'-Oxybis (benzenesulfonhydrazide, OBSH) (3,3'-Sulfonbis (benzene-sulfonylhydrazide), 1,1-azobisformamide (ABFA) - ( Wherein the battery is at least one selected from the group consisting of azodicarbonamide, p-toluenesulfonylsemicarbazide, and bariumazodicarboxylate (BaAC). delete The battery according to claim 1, wherein the film has a thickness in a range of 2 탆 or more to 5 탆 or less. The battery according to claim 1, wherein the temperature is in the range of 60 ° C or more to 300 ° C or less. The battery according to claim 16, wherein the temperature is in the range of 70 ° C or more to 270 ° C or less. delete delete delete delete A battery pack comprising the battery according to claim 1. A device using the battery pack according to claim 22 as a power source.