KR20080103251A - Lithium polymer bettry - Google Patents

Abstract

A lithium polymer battery is provided to minimize the elution of Cu element of a current collector to electrolyte by using an electrolyte composition containing a peroxide-based polymerization initiator and an electroconductive substrate except copper or an electroconductive substrate containing Cu element of 0-30% as a current collector. A lithium polymer battery comprises a positive electrode formed with a positive active material layer on the first current collector; a negative electrode formed with a negative active material layer on the second current collector; a peroxide-based polymerization initiator; a polymeric monomer; and an electrolyte salt. The first current collector, the second current collector or both of them are an electroconductive substrate excluding copper or an electroconductive substrate having surface share of a Cu element of 0-30%.

Description

Lithium Polymer Battery {LITHIUM POLYMER BETTRY}

The present invention relates to a lithium polymer battery.

Recently, interest in energy storage technology is increasing. As the field of application extends to the energy of mobile phones, camcorders and notebook PCs, and even electric vehicles, efforts for research and development of batteries are becoming more concrete. The electrochemical device is the field that is attracting the most attention in this respect, and in particular, according to the trend of recent miniaturization and light weight of the electronic device, the development of a lithium secondary battery as a battery capable of small and light weight and high capacity has become a focus of attention.

A lithium secondary battery may be generally manufactured using a positive electrode and a negative electrode including an electrode active material capable of inserting / releasing lithium ions, and an electrolyte which is a transfer medium of lithium ions. Conventionally, as said electrolyte, the liquid electrolyte, especially the ion conductive organic liquid electrolyte which melt | dissolved the salt in the non-aqueous organic solvent, was mainly used.

However, the use of the liquid electrolyte in this way, the electrode material is likely to degenerate, the organic solvent is volatilized or leaked, as well as the safety of the battery, such as ignition, explosion due to the temperature rise of the ambient temperature and the battery itself There is.

Thus, lithium polymer batteries using gel or solid electrolytes have been developed. The lithium polymer battery has no fear of leakage of electrolyte and volatilization, and less likely to ignite or explode, thereby ensuring safety of the battery. However, when the gel or solid electrolyte is applied, there is a problem that the battery performance is lower than when applying the liquid electrolyte.

Therefore, various studies have been conducted to improve the performance of lithium polymer batteries.

The present inventors recognize that in a lithium polymer battery, when a current collector including a peroxide-based polymerization initiator and a copper component is used in combination, the polymerization initiator and the copper component react to cause the copper component of the current collector to elute into the electrolyte. It was.

Based on this, the lithium polymer battery of the present invention intends to fundamentally exclude the reaction between the peroxide-based polymerization initiator and the copper component of the current collector.

The present invention is a positive electrode formed with a positive electrode active material layer on the first current collector; A negative electrode having a negative electrode active material layer formed on a second current collector; And an electrolyte composition comprising a peroxide-based polymerization initiator, a polymerizable monomer, and an electrolyte salt, wherein the first current collector, the second current collector, or both are electronically conductive substrates excluding copper, or a copper component Provided is a lithium polymer battery characterized by being an electronically conductive substrate having a surface occupancy of 0 to 30%.

Hereinafter, the present invention will be described in detail.

The lithium polymer battery is assembled by interposing a separator between a cathode and an anode on which an electrode active material layer is formed on a current collector, and then injecting an electrolyte composition including a polymerization initiator, a polymerizable monomer, and an electrolyte salt. It can be prepared by a method of polymerizing the composition to form a polymer electrolyte.

In this case, as the current collector of the positive electrode and the negative electrode, an electron conductive substrate such as copper is generally used, and as the polymerization initiator, a thermal polymerization initiator such as Benzoyl peroxide or AIBN (Azobis (iso-butyronitrile) or a photopolymerization such as Chloroacetophenone) is used. Initiators are generally used.

However, as a negative electrode current collector, a lithium polymer battery was prepared by using copper and Benzoyl peroxide in combination with a polymerization initiator. As a result, it was confirmed that the copper component of the current collector was eluted into the electrolyte by the Benzoyl peroxide polymerization initiator. In addition, it was found that the problem of eluting the current collector component by Benzoyl peroxide was particularly prominent when the current collector contained a copper component (see Experimental Examples 1, 2 and Table 2).

On the other hand, since the copper component eluted from the current collector is generally present in the form of ions in the electrolyte, it is inserted into the negative electrode together with the lithium ions during discharge of the battery, or precipitates on the negative electrode surface by reduction, thereby preventing the movement of lithium ions. As a result, battery performance may be degraded.

Accordingly, the present invention provides a negative electrode and a positive electrode having an electrode active material layer formed on the current collector; And an electrolyte composition comprising a peroxide-based polymerization initiator, a polymerizable monomer, and an electrolyte salt, wherein the current collector is an electron conductive substrate other than copper, or an electron having a surface occupancy of 0 to 30% of the copper component. It is characterized by the use of a conductive substrate. In the lithium polymer battery of the present invention, the performance of the peroxide-based polymerization initiator and the copper component of the current collector can be basically excluded, thereby minimizing battery performance deterioration. Here, the surface occupancy of the copper component is the ratio of the area occupied by the copper component in the current collector surface to the current collector total surface area.

The electronically conductive substrate excluding the copper is an electronically conductive material that does not include a copper component, and may be aluminum, tin, bismuth, silicon, antimony, nickel, titanium, vanadium, chromium, manganese, iron, cobalt, zinc, or molybdenum. , Tungsten, silver, lanthanum, ruthenium, platinum, iridium, alloys thereof, and the like.

Further, the electronically conductive substrate having a surface occupancy of 0 to 30% of the copper component may be an alloy of (i) copper or (ii) a part or all of the copper surface may be coated with a metal material other than copper. At this time, non-limiting examples of metals that can be used in combination with copper include aluminum, tin, bismuth, silicon, antimony, nickel, titanium, vanadium, chromium, manganese, iron, cobalt, zinc, molybdenum, tungsten, silver, Lanthanum, ruthenium, platinum, iridium and the like, which may be used alone or in combination.

On the other hand, it is preferable that the electronic conductive substrate used as the current collector in the present invention is not reactive with constituents in the battery, particularly lithium ions. In this case, the electron conductive substrate may not be reactive with lithium ions as such, or the reaction between the electron conductive substrate and lithium ions may be suppressed by the potential of lithium relative to the electrode active material layer formed on the substrate. For example, aluminum (Al) may occur an alloy reaction as shown in Chemical Formula 1 at a potential of less than 0.15 V relative to lithium. Therefore, when using an electronically conductive substrate containing aluminum (Al) as the current collector, an electrode active material layer having a potential of 0.15 V or more, such as LiWO ₂ , Li ₆ Fe ₂ O ₃ , and Li ₄ Ti ₅ O _12, may be used as an electrode. It is preferable to use as an active material and to suppress reaction of Al and lithium ion.

[Formula 1]

Li ⁺ + Al + e ^- ↔ Li ₃ Al (0.1V Li / Li ⁺ )

The positive electrode and the negative electrode applied to the lithium polymer battery of the present invention are in the form of an electrode active material layer formed on the current collector, except that the above-mentioned electron conductive substrate is used for the positive electrode current collector, the negative electrode current collector, or both. It may be prepared by conventional methods known in the art. For example, a slurry may be prepared by mixing and stirring a solvent, a binder, a conductive material, and a dispersant in an electrode active material, and then applying (coating) to the above-described electronic conductive substrate, compressing, and drying the same. .

The negative electrode active material may be a conventional negative electrode active material that can be used in the negative electrode of the conventional secondary battery, non-limiting examples of lithium metal, lithium alloy, carbon, petroleum coke that can store and release lithium ions , Activated carbon, graphite, carbon fiber, and the like. In addition, lithium oxide may be occluded and released, and metal oxides such as TiO ₂ , SnO _2, and the like with respect to lithium may be used, but are not limited thereto.

The positive electrode active material may be _a lithium transition metal composite oxide such as LiM _x O _y (M = Co, Ni, Mn, Co _a Ni _b Mn _c ) (for example, lithium manganese composite oxide such as LiMn ₂ O ₄ , LiNiO _2, etc.). Lithium cobalt oxides such as lithium nickel oxide, LiCoO ₂ , and manganese, nickel, and cobalt in which some of these oxides are substituted with other transition metals, or lithium-containing vanadium oxide, or a chalcogenide compound (for example, manganese dioxide) , Titanium disulfide, molybdenum disulfide, etc.) may be used. Preferably LiCoO ₂ , LiNiO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , Li (Ni _a Co _b Mn _c ) O ₂ (0 <a <1, 0 <b <1, 0 <c <1, a + b + c = 1), LiNi _1-Y Co _Y O ₂ , LiCo _1-Y Mn _Y O ₂ , LiNi _1-Y Mn _Y O ₂ (where 0 ≦ Y <1), Li (Ni _a Co _b Mn _c ) O ₄ (0 <a <2, 0 <b <2, 0 <c <2, a + b + c = 2), LiMn _2-z Ni _z O ₄ , LiMn _2-z Co _z O ₄ ( Here, 0 <Z <2), LiCoPO ₄ , LiFePO _4, or a mixture thereof is mentioned.

In addition, in order to suppress the reaction between the electron conductive substrate and the lithium ion, the cathode active material or cathode active material of the present invention may be selected and used in consideration of the potential of lithium in combination with the electron conductive substrate and the electrode active material itself.

Meanwhile, the lithium polymer battery of the present invention includes an electrolyte composition including a peroxide-based polymerization initiator, a polymerizable monomer, and an electrolyte salt. In addition, in the case of a gel lithium polymer battery, the electrolyte composition may further include an electrolyte solvent.

Non-limiting examples of the peroxide-based polymerization initiators include Benzoyl peroxide, Acetyl peroxide, Dilauryl peroxide, Di-tert-butyl peroxide, t-butyl peroxy-2-ethyl-hexanoate, Cumyl hydroperoxide, Hydrogen peroxide, and the like.

The polymerizable monomer is a monomer capable of forming a polymer by a polymerization reaction, and is not particularly limited as long as it can form a polymer having lithium ion conductivity when mixed with an electrolyte salt. The polymerizable monomer preferably includes two or more structural units of an electron donating group capable of interacting with a cation, such as a vinyl group or a (meth) acrylate group, at the terminal. Non-limiting examples of the polymerizable monomer include tetraethylene glycol diacrylate, polyethylene glycol diacrylate (molecular weight 50-20,000), 1,4-butanediol diacrylate (1). , 4-butanediol diacrylate, 1,6-hexandiol diacrylate, TriMethylolpropane triacrylate, trimethylolpropane ethoxylate triacrylate , Trimethylolpropane propoxylate triacrylate, DiTriMethylolPropane TetraAcrylate, Pentaerythritol tetraacrylate, Pentaerythritol ethoxylate tetraacrylate ethoxylate tetraacrylate), dipentaerytes DiPentaErythritol PentaAcrylate, DiPentaErythritol HexaAcrylate, p-diazogylphenylamine, vinyl azide benzoate, vinyl azide phthalate, styrene, hexamethylene diamine azine phosphate Citrate, ε-caprolactam, polyethyleneglycol, p-carstyrene and the like, which may be used alone or in combination.

The electrolyte salt is not particularly limited as long as it is used as a conventional battery electrolyte salt. For example, the electrolyte salt is (i) Li ^+, Na ^+, a cation and (ii) selected from the group consisting of _{^{K + PF 6 -, BF 4}} -, Cl -, Br -, I -, ClO 4 -, _{^{AsF 6 -, CH 3 CO 2}} -, CF 3 SO 3 -, N (CF 3 SO 2) 2 -, C (CF 2 SO 2) 3 - , but can be configured with a combination of an anion selected from the group consisting of, this limited I never do that. These electrolyte salts can be used alone or in combination.

The electrolyte solvent is not particularly limited as long as it is usually used as an organic solvent for nonaqueous electrolyte, and cyclic carbonate, linear carbonate, lactone, ether, ester, sulfoxide, acetonitrile, lactam, ketone, and the like can be used. Examples of the cyclic carbonate include ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), fluoroethylene carbonate (FEC), and the like. Examples of the linear carbonate include diethyl carbonate (DEC) and dimethyl carbonate. (DMC), dipropyl carbonate (DPC), ethylmethyl carbonate (EMC), methyl propyl carbonate (MPC), and the like. Examples of the lactone include gamma butyrolactone (GBL), and examples of the ether include dibutyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane, 1,2-diethoxyethane and the like. Examples of such esters include methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, butyl propionate, methyl pivalate and the like. The sulfoxide includes dimethyl sulfoxide, the lactam includes N-methyl-2-pyrrolidone (NMP), and the ketone includes polymethylvinyl ketone. Moreover, the halogen derivative of the said organic solvent can also be used. These organic solvents can be used individually or in mixture.

In addition, the electrolyte composition may be polymerized in a battery to form a polymer electrolyte. In this case, the polymerization may be by a conventional polymerization method known in the art, for example by an in-situ polymerization reaction.

The in-situ polymerization may be performed through thermal polymerization. At this time, the polymerization time takes about 20 minutes to 12 hours, the thermal polymerization temperature may be 40 to 80 ℃.

In the present invention, the polymerization is carried out, but it is preferable to proceed under an inert condition. When the polymerization reaction is carried out in an inert atmosphere as described above, the reaction between oxygen and radicals in the atmosphere, which is a radical quenching agent, is essentially blocked, so that there is almost no monomer which is an unreacted crosslinking agent. Can be increased. Therefore, it is possible to prevent the charge and discharge performance degradation caused by the large amount of unreacted monomer remaining inside the battery.

As the inert atmosphere conditions, low reactivity gases known in the art may be used, and in particular, one or more inert gases selected from the group consisting of nitrogen, argon, helium, and xenon may be used .

On the other hand, the lithium polymer battery of the present invention may further include a separator, there is no particular limitation on the separator, it is preferable to use a porous separator, non-limiting examples of polypropylene, polyethylene, or polyolefin-based porous Separators and the like. In addition, a method of applying the separator to a battery may include lamination, stacking, and folding of the separator and the electrode, in addition to winding, which is a general method.

The lithium polymer battery of the present invention can be prepared according to conventional methods known in the art. For example, a step of injecting an electrode assembly having a separator between the cathode and the anode in the battery case; And injecting an electrolyte composition into the case and then polymerizing to form a polymer electrolyte.

The lithium polymer battery of the present invention is not limited in appearance, but may be cylindrical, square, pouch type, or coin type using a can.

Hereinafter, the present invention will be described in detail with reference to the following Examples. However, the following examples are merely to illustrate the present invention and the present invention is not limited by the following examples.

Example 1

1-1. Preparation of gel polymer electrolyte composition

Ethylene carbonate (EC): Ethyl methyl carbonate (EMC) = 1: dissolved LiPF ₆ in a non-aqueous solvent having a composition of 1 to 2M concentration, and then polymerized with 5 parts by weight of trimethylolpropane triacrylate as a synthetic monomer to 100 parts by weight of the solution 0.15 parts by weight of benzoyl peroxide (BPO) was added as an initiator to prepare a composition for a gel polymer electrolyte.

1-2. Fabrication of the Battery Assembly

90 parts by weight of LiCoO ₂ as a positive electrode active material, 5 parts by weight of acetylene black as a conductive agent and 5 parts by weight of PVDF as a binder were added to NMP (N-methyl-2-pyrrolidone) to prepare a positive electrode slurry, which was then aluminum (Al). The positive electrode was prepared by applying and drying on a current collector.

95 parts by weight of Li ₄ Ti ₅ O ₁₂ was used as a negative electrode active material, and 5 parts by weight of PVDF as a binder was added to NMP to prepare a negative electrode slurry, followed by coating and drying on an aluminum (Al) current collector to prepare a negative electrode.

After interposing a polyolefin-based separator between the positive electrode and the negative electrode was wound several times to prepare a battery assembly in the form of a jelly roll (Jelly roll).

1-3. Preparation of Gel Polymer Lithium Secondary Battery

The composition for gel polymer electrolyte prepared in 1-1 was infused into the battery assembly prepared in 1-2, and vacuum-packed and left at room temperature for 15 hours. Thereafter, polymerization was performed at 80 ° C. for 4 hours to finally prepare a gel polymer lithium secondary battery.

Comparative Example 1

In preparing the negative electrode, a gel polymer lithium secondary battery was manufactured in the same manner as in Example 1, except that artificial graphite instead of Li ₄ Ti ₅ O ₁₂ and a copper (Cu) current collector were used instead of an aluminum (Al) current collector. Prepared.

Comparative Example 2

A gel polymer lithium secondary battery was manufactured in the same manner as in Comparative Example 1, except that 0.30 parts by weight of benzoyl peroxide was used instead of 0.15 parts by weight of the gel polymer electrolyte.

Comparative Example 3

A gel polymer lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.15 parts by weight of azobisisobutyronitrile (AIBN) was used instead of benzoyl peroxide in preparing the gel polymer electrolyte.

Comparative Example 4

A gel polymer lithium secondary battery was manufactured in the same manner as in Comparative Example 3, except that artificial graphite instead of Li ₄ Ti ₅ O ₁₂ and a copper (Cu) current collector were used instead of an aluminum (Al) current collector. .

Experimental Example 1. Evaluation of Battery Performance

The gel polymer lithium batteries prepared in Examples 1 and 2 and Comparative Examples 1 to 3 were charged and discharged 50 times at 0.5 C at room temperature, and the actual discharge capacity was measured.

The reduction ratio of the actual discharge capacity measured above to the theoretical capacity of Example 1 and Comparative Examples 1 and 2 is shown in Table 1 below.

TABLE 1

Polymerization initiator Cathode Current Collector Theoretical capacity (mAh) Actual capacity (mAh) Capacity reduction rate (%) Example 1 BPO Al 410 369.59 10 Comparative Example 1 BPO Cu 710 181.46 74 Comparative Example 2 BPO Cu 710 85.96 88 Comparative Example 3 AIBN Al 410 355.63 13 Comparative Example 4 AIBN Cu 710 570.85 20

As a result of the experiment, the cells of Comparative Examples 1, 2 and 4 using copper (Cu) as the negative electrode current collector had a larger actual capacity reduction ratio than the theoretical capacity compared to those of Examples 1 and 3 using aluminum (Al). Showed a tendency.

In particular, in the case of a lithium polymer battery using an azo series polymerization initiator (AIBN), the theoretical capacity of the battery of Comparative Example 3 using aluminum (Al) as the negative electrode current collector and the battery of Comparative Example 4 using copper (Cu) While the difference in the actual capacity reduction rate is only about 7%, in the case of the lithium polymer battery using the peroxide-based polymerization initiator (BPO), the batteries of Comparative Examples 1 and 2 using copper (Cu) as the negative electrode current collector are aluminum (Al) Compared to the battery of Example 1 using), the reduction rate of the actual capacity relative to the theoretical capacity is about 64% or more, and the actual capacity is significantly reduced.

From the results of the experiment, the current collector component may be eluted by the polymerization initiator during the production of a lithium polymer battery, and the above-mentioned dissolution may be remarkably occurred when the current collector including the peroxide-based polymerization initiator and the copper component are used together. there was.

On the other hand, in Comparative Examples 1 and 2 in which the amount of peroxide-based polymerization initiator (BPO) was changed, the battery of Comparative Example 2 using a larger amount of polymerization initiator had a lower ratio of actual capacity to theoretical capacity than that of Comparative Example 1. Was bigger. From this, it can be seen that the peroxide-based polymerization initiator reacts with the current collector to elute the current collector component.

Experimental Example 2.

Experimental Example 1-1.

The gel polymer electrolyte composition was prepared in the same manner as in Example 1-1, except that 3 parts by weight of trimethylolpropane triacrylate was used instead of 0.15 part by weight and 0.09 part by weight of benzoyl peroxide instead of 0.15 part by weight. Was prepared.

In preparing the negative electrode, a battery assembly was manufactured in the same manner as in Example 1-2, except that artificial graphite instead of Li ₄ Ti ₅ O ₁₂ and copper (Cu) current collectors were used instead of aluminum (Al) current collectors. .

The battery assembly and the composition for the gel polymer electrolyte were placed in a glass bottle, and left for one day to form a gel polymer electrolyte. Thereafter, the remaining liquid without gelation was subjected to inorganic element analysis using an ICP (Inductively Coupled Plasma) emission spectrometer. The results are shown in Table 1 below.

Experimental Example 1-2.

Inorganic element analysis was performed in the same manner as in Experimental Example 1-1, except that the battery assembly was not placed in the glass bottle in Experimental Example 1-1.

Experimental Example 1-3.

In Example 1-1, a bottle made of polyethylene was used instead of a glass bottle, and a non-origin analysis was performed in the same manner as in Experimental Example 1-1, except that the battery assembly was not placed therein.

Experimental Example 1-4.

In preparing the composition for the gel polymer electrolyte in Experimental Example 1-1, an inorganic element analysis was performed in the same manner as in Experimental Example 1-1, except that trimethylolpropane triacrylate and benzoyl peroxide were not added.

Experimental Example 1-5.

In preparing the composition for the gel polymer electrolyte in Experimental Example 1-1, an inorganic element analysis was performed in the same manner as in Experimental Example 1-1, except that benzoyl peroxide was not added.

TABLE 2

Al Ba Ca Cu K Na Zn Experimental Example 1-1 <1 25 5 45 40 145 15 Experimental Example 1-2 <1 <1 <1 One <1 One <1 Experimental Example 1-3 <1 <1 <1 One <1 <1 <1 Experimental Example 1-4 <1 <1 <1 One 2 11 <1 Experimental Example 1-5 <1 <1 <1 One <1 6 <1

As a result, only a small amount of the copper component was detected in Experimental Examples 1-2 to 1-5 in which neither the copper current collector nor the Benzoyl peroxide polymerization initiator was used, whereas the copper current collector and the Benzoyl peroxide polymerization initiator were used in combination. In Experimental Example 1-1, a considerable amount of copper component was detected.

From this, when a copper current collector and a peroxide-based polymerization initiator are used together in the production of a lithium polymer battery, a considerable amount of the copper component is contained in the electrolyte, and the copper component is due to the elution of the copper current collector by the peroxide-based polymerization initiator. Could know.

On the other hand, the inorganic analysis results of Experimental Examples 1-1 to 1-5 show that the detected amount of aluminum (Al) is a very small amount, so that the Al current collector eluted by the peroxide-based polymerization initiator is very insignificant.

The present invention provides a current collector by using an electronically conductive substrate other than copper or an electronically conductive substrate having a surface occupancy of 0 to 30% of the copper component other than copper as a current collector in the production of a lithium polymer battery using an electrolyte composition including a peroxide-based polymerization initiator. Elution of the entire copper component into the electrolyte can be minimized.

Claims (8)

An anode having a cathode active material layer formed on a first current collector; A negative electrode having a negative electrode active material layer formed on a second current collector; And an electrolyte composition comprising a peroxide-based polymerization initiator, a polymerizable monomer, and an electrolyte salt, the lithium polymer battery comprising: The first current collector, the second current collector, or both of them is an electronically conductive substrate excluding copper, or an electronically conductive substrate having a surface occupancy of 0 to 30% of the copper component. The lithium polymer battery of claim 1, wherein the electrolyte composition including the peroxide-based polymerization initiator, the polymerizable monomer, and the electrolyte salt is polymerized inside the battery to form a polymer electrolyte. The method of claim 1, wherein the electronic conductive substrate excluding copper is aluminum, tin, bismuth, silicon, antimony, nickel, titanium, vanadium, chromium, manganese, iron, cobalt, zinc, molybdenum, tungsten, silver, lanthanum, A lithium polymer battery, characterized in that selected from the group consisting of ruthenium, platinum, iridium and alloys thereof. The method of claim 1, wherein the electronic conductive substrate having a surface area of 0 to 30% of the copper component is (i) an alloy of copper, or (ii) a part or all of the copper surface is coated with a metal material other than copper Characteristic lithium polymer battery. The method of claim 4, wherein the alloy of copper is aluminum, tin, bismuth, silicon, antimony, nickel, titanium, vanadium, chromium, manganese, iron, cobalt, zinc, molybdenum, tungsten, silver, lanthanum, ruthenium Lithium polymer battery, characterized in that the alloy of copper and metal selected from the group consisting of platinum, iridium. The method of claim 4, wherein the metal material other than copper is aluminum, tin, bismuth, silicon, antimony, nickel, titanium, vanadium, chromium, manganese, iron, cobalt, zinc, molybdenum, tungsten, silver, lanthanum, ru Lithium polymer battery, characterized in that selected from the group consisting of tenium, platinum, iridium. The method of claim 1, wherein the positive electrode, the negative electrode, or both of the current collector comprising aluminum (Al); And an electrode active material having a potential of 0.15 V or more relative to lithium. The lithium polymer battery of claim 7, wherein the electrode active material having a potential of 0.15 V or more relative to lithium is selected from the group consisting of LiWO ₂ , Li ₆ Fe ₂ O ₃ , and Li ₄ Ti ₅ O ₁₂ .