KR20130123621A - Cathode catalyst for lithium-air battery, method of manufacturing the same, and lithium-air battery comprising the same - Google Patents

Abstract

The present invention relates to a cathode catalyst for a lithium-air battery, a manufacturing method thereof, and a lithium-air battery comprising the same and, in particular, to a cathode catalyst capable of improving the storing capacity of a battery for charging and discharging electricity and increasing the cycle lifetime of charging and discharging electricity, a method thereof and a lithium-air battery comprising the same. The cathode catalyst has a layered perovskite structure and includes lanthanum and nickel oxide. A cathode for a lithium-air battery is produced by using the cathode catalyst including the layered perovskite and the lithium-air battery is provided by using the cathode. The storing capacity of a lithium-air battery for charging and discharging electricity can be increased and the cycle lifetime of charging and discharging electricity can be improved. [Reference numerals] (AA) Example 2;(BB) Example 1;(CC) Comparative example 2

Description

Cathode Catalyst for Lithium-Air Battery, Method of Manufacturing the Same, and Lithium-Air Battery Comprising the Same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive electrode catalyst for a lithium-air battery, a method for producing the same, and a lithium-air battery including the same. More particularly, A method for producing the same, and a lithium-air battery including the same.

Lithium-ion batteries are becoming one of the three most advanced components in the information electronics industry, along with semiconductors and display devices. In recent years, lithium ion batteries have been used not only in portable communication devices such as mobile phones and personal digital assistants (PDA) but also in electric vehicles, and it is therefore essential to increase the capacity, miniaturization and weight of the batteries.

However, as the battery becomes smaller and lighter, the storage capacity for charging and discharging becomes smaller. Therefore, it is required to develop a battery having improved charge-discharge storage capacity for use without supplying external power for a long period of time.

A lithium-air battery is a new energy storage device that can replace a conventional lithium ion battery, using lithium (Li) metal as the cathode and oxygen (O ₂ ) as the cathode active material.

The lithium-air battery is a battery system in which a secondary battery and a fuel cell technology are combined. In the cathode, lithium oxidation / reduction reaction occurs, and at the anode, reduction / oxidation reaction of oxygen introduced from the outside occurs. The theoretical energy density of the lithium-air battery is 11,140 Wh / kg and has a very high advantage over other secondary batteries.

Lithium-air batteries typically consist of a cathode, an anode, an electrolyte disposed between the cathode and anode, and a separator. Generally, porous carbon is used as a constituent of the anode. However, due to the low activity of the oxygen reduction / oxidation reaction, the charge-discharge storage capacity actually measured is very low and the charge-discharge cycle life is short. Therefore, it is urgently required to develop a catalyst capable of promoting the oxygen reaction at the anode of the lithium-air battery to improve capacity and cycle life.

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present invention provides a positive electrode catalyst for a lithium-air battery capable of improving the charge-discharge storage capacity of the battery and increasing the charge-discharge cycle life, And to provide a battery.

The present invention provides a cathode catalyst for a lithium-air battery including a lanthanum nickel oxide having a layered perovskite structure.

The molar ratio of nickel to lanthanum in the lanthanum nickel oxide is preferably 1.95 to 2.05.

In the lanthanum nickel oxide, a part of the lanthanum may be substituted with at least one first substituent selected from calcium (Ca) and strontium (Sr).

In the lanthanum nickel oxide, a part of the nickel may be substituted with at least one second substituent selected from copper (Cu), cobalt (Co), and manganese (Mn).

The present invention also provides a method for producing a mixture comprising: a first step of mixing a lanthanum nitrate, a nickel nitrate, a hydroxy alcohol and distilled water to form a mixture; A second step of mixing the hydroxycarboxylic acid with the mixture prepared in the first step to form a sol; A third step of heating the sol formed in the second step to produce a gel; A fourth step of pyrolyzing the gel prepared in the third step; And a fifth step of preparing a cathode catalyst by heat-treating the product obtained in the fourth step, and a fifth step of preparing a catalyst for a lithium-air battery.

The manufacturing method may further include cooling and crushing the anode catalyst.

The hydroxy alcohol may be one or two or more selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol.

The hydroxycarboxylic acid may be one or more selected from the group consisting of citric acid, glycolic acid, mandelic acid, and lactic acid.

In the first step, the ethylene glycol is preferably added in an amount of 5 to 50 parts by weight based on 100 parts by weight of the distilled water.

In the second step, citric acid is preferably added in an amount of 1 to 5 times the molar amount of the metal nitrate added in the first step.

The temperature for heating the sol in the third step is preferably 60 ° C to 80 ° C, and the temperature for pyrolyzing the gel in the fourth step is preferably 200 ° C to 300 ° C.

In the fifth step, the heat treatment temperature is preferably 500 ° C to 1000 ° C.

The present invention also provides a positive electrode for a lithium-air battery, comprising the positive electrode catalyst for the lithium-air battery, the binder, and the porous carbon.

The binder may be selected from the group consisting of PVdF, vinylidene fluoride / hexafluoropropylene copolymer, polyvinylidene fluoride, polyacrylonitrile, polymethylmethacrylate, polytetrafluoroethylene, styrene, butadiene, ≪ RTI ID = 0.0 > and / or < / RTI >

The porous carbon may be, for example, carbon black, activated carbon, or graphite carbon.

The present invention also provides a lithium-air battery positive electrode; A cathode made of lithium metal or a lithium alloy; A separator disposed between the anode and the cathode; And a lithium-air battery including an electrolyte.

The separator may comprise one or more materials selected from the group consisting of glass fiber, polyester, Teflon, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), polyethylene and polypropylene.

In addition, the electrolyte solution may include a solvent and a lithium salt.

The solvent may be at least one selected from the group consisting of propylene carbonate, ethylene carbonate, fluoroethylene carbonate, diethyl carbonate, ethylmethyl carbonate, methylpropyl carbonate, butylene carbonate, benzonitrile, acetonitrile, tetrahydrofuran, 2-methyltetrahydrofuran, Examples of the solvent include lactone, dioxolane, 4-methyldioxolane, N, N-dimethylformamide, dimethylacetamide, dimethylsulfoxide, dioxane, 1,2-dimethoxyethane, sulfolane, dichloroethane, Examples of the organic solvent include dimethyl carbonate, dimethyl carbonate, diethyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, ethyl propyl carbonate, dipropyl carbonate, dibutyl carbonate, diethylene glycol, dimethyl ether, dimethyldiglycol, dimethyltriglycol, Dimethyltetraglycol, < / RTI > and < RTI ID = 0.0 > It can include the quality.

Wherein the lithium salt is selected from the group consisting of LiPF ₆ , LiBF ₄ , LiSbF ₆ , LiAsF ₆ , LiClO ₄ , LiCF ₃ SO ₃ , Li (CF ₃ SO ₂ ) ₂ N, LiC ₄ F ₉ SO ₃ , LiSbF ₆ , LiAlO ₄ , LiAlCl ₄ , LiN (C _x F _{2x + 1} SO ₂ ) (C _y F _{2y + 1} SO ₂ ) (where x and y are natural numbers), LiCl and LiI .

The positive electrode catalyst for a lithium-air battery of the present invention includes a lanthanum nickel oxide having a layered perovskite structure, thereby increasing the charge-discharge storage capacity and the charge-discharge cycle life of the lithium-air battery.

Fig. 1 is an X-ray diffraction pattern of the positive electrode catalyst powder prepared in Examples 1 and 2 and Comparative Example 2. Fig.
FIG. 2 is a graph showing charge-discharge curves of the lithium-air cells produced in Examples 1 and 2 and Comparative Examples 1 and 2. FIG.
FIG. 3 is a graph showing the cycle characteristics (discharge capacity retention rate - cycle life) of the lithium-air cells produced in Examples 1 and 2 and Comparative Examples 1 and 2. FIG.

Hereinafter, the present invention will be described in detail. In the following description of the present invention, detailed descriptions of related well-known configurations or functions may be omitted.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical meanings and concepts of the present invention.

The embodiments described in the present specification and the configurations shown in the drawings are preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention and thus various equivalents and modifications Can be.

The cathode catalyst for a lithium-air battery of the present invention comprises a lanthanum nickel oxide having a layered perovskite structure.

Lanthanum nickel oxide has excellent catalytic activity for oxygen reduction and oxidation reactions. In addition, the layered perovskite structure has a layer of rock-salt structure interposed between the existing perovskite structures, which can have various oxygen contents, and this structural difference further promotes the reduction and oxidation of oxygen. .

The molar ratio of lanthanum and nickel in the lanthanum nickel oxide is preferably 1.95 to 2.05: 1 in order to form a layered perovskite.

In the lanthanum nickel oxide, a part of the lanthanum (La) may be substituted with at least one first substituent selected from calcium (Ca) and strontium (Sr), and a part of the nickel (Ni) Cobalt (Co), and manganese (Mn).

 When the first and second substituents are added, the oxygen vacancy concentration in the lanthanum nickel oxide may be increased and trivalent Ni ions may be formed to increase the electrical conductivity and oxygen exchange rate at the surface.

The preferred molar ratio of the first substituent to the lanthanum is from 0.05 to 1. The molar ratio of the first substituent to the second substituent is less than the lower limit described above It is difficult to obtain the effect as described above, and when the upper limit is exceeded, the catalytic activity of the lanthanum nickel oxide is lowered, which is not preferable.

The method for producing a positive electrode catalyst for a lithium-air battery according to the present invention comprises the steps of: mixing lanthanum, nickel nitrate, ethylene glycol and distilled water to prepare a mixture, mixing citric acid with the mixture prepared in the first step, ); A third step of heating the sol formed in the second step to produce a gel; A fourth step of pyrolyzing the gel prepared in the third step; And a fifth step of preparing a cathode catalyst by heat-treating the product obtained in the fourth step.

The manufacturing method may further include the step of cooling and grinding the cathode catalyst.

In the first step, the ethylene glycol is preferably added in an amount of 5 to 50 parts by weight based on 100 parts by weight of the distilled water.

The mixture may be prepared by further adding at least one nitrate selected from calcium (Ca) and strontium (Sr), at least one nitrate selected from copper (Cu), cobalt (Co) have.

In the second step, citric acid is preferably added in an amount of 1 to 5 times the molar amount of the metal nitrate added in the first step. The molar number of the metal nitrate refers to the molar amount of the metal nitrate including lanthanum nitrate and nickel nitrate. When other nitrates such as calcium, strontium, copper, cobalt and manganese are added in the first step, Point.

The first and second steps may not only be performed sequentially but also simultaneously.

The temperature for heating the sol in the third step is preferably 60 ℃ to 80 ℃. If the heating temperature is less than 60 ℃ temperature is too low, there is a problem difficult to form a gel, if it exceeds 80 ℃ it is not preferable because the gel is formed in a short time it is difficult to produce a gel having a uniform composition.

The temperature for pyrolyzing the gel in the fourth step is preferably 200 ℃ to 300 ℃. If the pyrolysis temperature is less than 200 ℃ the temperature is too low there is a problem that the gel is not decomposed, and if it exceeds 300 ℃ it may not be preferable because there is a problem that it is difficult to obtain an oxide of a uniform composition because the crystallization may occur simultaneously with the thermal decomposition.

The heat treatment temperature in the fifth step is preferably 500 ° C to 1000 ° C. If the heat treatment temperature is less than 500 ° C., crystallization does not occur, and if it exceeds 1000 ° C., there is a problem in that coarse particles of oxide are formed, which is not preferable.

The positive electrode catalyst for a lithium-air battery is prepared by mixing a binder and porous carbon to prepare a positive electrode material composition, shaping the composition into a predetermined shape, or applying the positive electrode material composition to a current collector such as a nickel mesh, Can be manufactured.

Here, a separate conductive material, a solvent and the like may be further added to the cathode material composition for preparing the anode for the lithium-air battery.

Looking at the cathode manufacturing method in more detail, the positive electrode plate may be obtained by coating the positive electrode material composition directly on the nickel mesh current collector or by casting the positive electrode material film cast on a separate support and peeling from the support to the nickel mesh current collector. Can be. The positive electrode for a lithium-air battery is not limited to the above-described one, but may be a form other than the above-described one.

Examples of the binder include vinylidene fluoride / hexafluoropropylene copolymer, polyvinylidene fluoride, polyacrylonitrile, polymethyl methacrylate, polytetrafluoroethylene and mixtures thereof, and styrene butadiene rubber-based polymers. Carbon black, activated carbon or graphite carbon may be used as the porous carbon, and N-methylpyrrolidone (NMP), acetone, water and the like may be used as the solvent. The content of the cathode catalyst, the porous carbon, the binder and the solvent in the cathode material composition can be appropriately adjusted within a range that is conventionally used for electrode production in a lithium battery.

The lithium-air battery employing the positive electrode for a lithium-air battery includes: a positive electrode for the lithium-air battery; A cathode made of lithium metal or a lithium alloy; A separator for separating the positive electrode and the negative electrode; And an electrolytic solution.

A method of manufacturing such a lithium-air battery will be briefly described below.

First, a positive electrode comprising the positive electrode catalyst for the lithium-air battery is manufactured. Next, a negative electrode is manufactured using active materials such as lithium metal and lithium alloys commonly used in the art. Next, a separator impregnated with an electrolyte is disposed between the positive electrode plate and the negative electrode plate to form a battery structure.

As the separator, any one commonly used in lithium batteries can be used. In particular, it is desirable to have low resistance to ion migration of the electrolyte and excellent electrolyte impregnation ability. For example, selected from glass fiber, polyester, Teflon, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), or a combination thereof, and may be nonwoven fabric or woven fabric. Specifically, polyethylene, polypropylene, or the like can be used.

The electrolytic solution may include a solvent and a lithium salt. Examples of the solvent include propylene carbonate, ethylene carbonate, fluoroethylene carbonate, diethyl carbonate, ethylmethyl carbonate, methylpropyl carbonate, butylene carbonate, benzonitrile, acetonitrile, N, N-dimethylformamide, dimethylacetamide, dimethylsulfoxide, dioxane, 1,2-dimethoxyethane, 1,2-dimethoxyethane, Dimethyl carbonate, dimethyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, ethyl propyl carbonate, dipropyl carbonate, dibutyl carbonate, diethyl carbonate, diethyl carbonate, Ethylene glycol, dimethyl ether, dimethyldiglycol, dimethyltriglycol, dimethyltetra And the glycol and the like can be used, is LiPF ₆ as a lithium _{salt, LiBF 4, LiSbF 6, LiAsF} 6, LiClO 4, LiCF 3 SO 3, Li (CF 3 SO 2) 2 N, LiC 4 F 9 SO 3, LiSbF 6 , LiAlO ₄ , LiAlCl ₄ , LiN (C _x F _{2x + 1} SO ₂ ) (C _y F _{2y + 1} SO ₂ ) (where x and y are natural numbers), LiCl, LiI, and the like may be used.

The lithium-air battery is suitable for applications requiring high capacity such as an electric vehicle, a mobile phone, a portable computer, and the like. The lithium-air battery is widely used in a hybrid vehicle and the like in combination with a conventional internal combustion engine, a fuel cell, and a supercapacitor. Can be used.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for describing the present invention in more detail and that the scope of the present invention is not limited by these embodiments in accordance with the gist of the present invention .

Example 1 : Preparation of a positive electrode and a lithium-air battery using an anode catalyst

As starting materials, lanthanum nitrate, calcium nitrate, nickel nitrate and copper nitrate were selected. La, Ca, Ni and Cu was calculated as 1.7: 0.3: 0.9: 0.1, and the starting materials were weighed. Then, the starting materials were dissolved in ethylene glycol and distilled water, and then citric acid was added thereto to prepare a sol. At this time, ethylene glycol was added in an amount of 10 parts by weight based on 100 parts by weight of distilled water, and citric acid equivalent to three times the total number of moles of starting materials was added. The solution was heated to 70 占 폚 to prepare a gel, and the gel was continuously heated and pyrolyzed at 250 占 폚. The catalyst was then prepared after the heat treatment was completed at 900 DEG C for 5 hours. The catalyst was cooled as it was in the furnace and then pulverized.

The prepared anode catalyst, carbon black (Ketjen Black) and PVdF binder were mixed at a weight ratio of 30:50:20 to prepare a slurry. The slurry was coated on a nickel mesh, dried at 80 ° C, and vacuum-dried at 120 ° C to prepare a positive electrode plate.

A lithium-air battery was prepared using the positive electrode plate, the lithium counter electrode, the glass fiber separator, and an electrolyte in which 1 M Li (CF ₃ SO ₂ ) ₂ N was dissolved in dimethyl tetraglycol.

Example 2 : Preparation of a positive electrode and a lithium-air battery using a positive electrode catalyst

As starting materials, lanthanum nitrate, calcium nitrate, nickel nitrate and copper nitrate were selected. La, Ca, Ni, and Cu was calculated as 1.7: 0.3: 0.75: 0.25, and the starting materials were weighed. Then, the starting materials were dissolved in ethylene glycol and distilled water, and then citric acid was added thereto to prepare a sol. At this time, ethylene glycol was added in an amount of 10 parts by weight based on 100 parts by weight of distilled water, and citric acid equivalent to three times the total number of moles of starting materials was added. The solution was heated to 70 占 폚 to prepare a gel, and the gel was continuously heated and pyrolyzed at 250 占 폚. The catalyst was then prepared after the heat treatment was completed at 900 DEG C for 5 hours. The catalyst was cooled as it was in the furnace and then pulverized.

The prepared anode catalyst, carbon black (Ketjen Black) and PVdF binder were mixed at a weight ratio of 30:50:20 to prepare a slurry. The slurry was coated on a nickel mesh, dried at 80 ° C, and vacuum-dried at 120 ° C to prepare a positive electrode plate.

A lithium-air battery was prepared using the positive electrode plate, the lithium counter electrode, the glass fiber separator, and an electrolyte in which 1 M Li (CF ₃ SO ₂ ) ₂ N was dissolved in dimethyl tetraglycol.

Comparative Example 1 : Production of a positive electrode plate excluding a positive electrode catalyst

Carbon black (Ketjen Black) and PVdF binder were mixed in a weight ratio of 30:50:20 without an anode catalyst to prepare a slurry. The slurry was coated on a nickel mesh, dried at 80 ° C, and vacuum-dried at 120 ° C to prepare a positive electrode plate.

Comparative Example 2 : Preparation of a positive electrode and a lithium-air battery using a positive electrode catalyst

Lanthanum nitrate, strontium nitrate and manganese acetate were selected as starting materials. The starting materials were weighed and calculated by calculating the molar ratio between La, Sr and Mn as 0.8: 0.2: 1.0. Then, the starting materials were dissolved in ethylene glycol and distilled water, and then citric acid was added thereto to prepare a sol. At this time, ethylene glycol was added in an amount of 10 parts by weight based on 100 parts by weight of distilled water, and citric acid equivalent to three times the total number of moles of starting materials was added. The solution was heated to 70 占 폚 to prepare a gel, and the gel was continuously heated and pyrolyzed at 250 占 폚. The catalyst was then prepared after the heat treatment was completed at 900 DEG C for 5 hours. The catalyst was cooled as it was in the furnace and then pulverized.

The prepared anode catalyst, carbon black (Ketjen Black) and PVdF binder were mixed at a weight ratio of 30:50:20 to prepare a slurry. The slurry was coated on a nickel mesh, dried at 80 ° C, and vacuum-dried at 120 ° C to prepare a positive electrode plate and a lithium-air battery.

Evaluation example 1 : X-ray diffraction experiment

X-ray diffraction experiments were conducted to understand the crystal structure of the anode catalysts prepared in Examples 1 and 2 and Comparative Example 2. The experimental results are shown in Fig. As shown in FIG. 1, the anode catalyst powder prepared in Examples 1 and 2 exhibited a layered perovskite structure, and it was confirmed that a secondary phase or an impurity phase was not formed. In addition, the positive electrode catalyst powder produced in Comparative Example 2 exhibited a single perovskite structure.

Evaluation Example 2 : Charge-discharge storage capacity experiment

Charge-discharge experiments were carried out using the lithium-air cells prepared in Examples 1 and 2 and Comparative Examples 1 and 2. Specifically, a constant current of 25 mA / g was applied to discharge to 2.0 V, and then charged to 4.4 V by applying a constant current of 25 mA / g. Here, the applied current density was calculated based on the sum of the weights of the carbon black and the catalyst.

FIG. 2 shows charge-discharge curves of the lithium-air cells produced in Examples 1 and 2 and Comparative Examples 1 and 2. Here, the charge-discharge capacity was calculated based on the sum of the weight of the carbon black and the weight of the catalyst. As can be seen from Examples 1 and 2, a lithium-air battery including a positive electrode catalyst having a layered perovskite structure exhibits a higher charge-discharge capacity than Comparative Examples 1 and 2.

Evaluation Example 3 : Charge-discharge cycle life test

Charge-discharge cycle experiments were performed using the lithium-air cells prepared in Examples 1 and 2 and Comparative Examples 1 and 2. [ Specifically, a constant current of 50 mA / g was applied to discharge to 2.5 V, and then charged to 4.5 V by applying a constant current of 50 mA / g. Here, the applied current density was calculated based on the sum of the weights of the carbon black and the catalyst. The discharging and charging were repeated ten times.

FIG. 3 shows the capacity retention rate during the cycle test of the lithium-air cells prepared in Examples 1 and 2 and Comparative Examples 1 and 2. As can be seen from Examples 1 and 2, the lithium-air battery including the positive electrode catalyst having a layered perovskite structure exhibits excellent cycle characteristics as compared with Comparative Examples 1 and 2. [

From this, it can be seen that the cathode catalyst having the layered perovskite structure produced by the present invention promotes the oxygen reduction / oxidation reaction and exhibits improved activity compared to the catalyst of the single perovskite structure, The discharge storage capacity and the charge-discharge cycle life are improved.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention.

It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

Claims (18)

A cathode catalyst for a lithium-air battery comprising lanthanum nickel oxide having a layered perovskite structure.
The method of claim 1,
The molar ratio of the lanthanum and nickel is 1.95 to 2.05: 1 cathode catalyst for lithium air batteries.
The method of claim 1,
A part of the lanthanum is a cathode catalyst for lithium-air batteries, characterized in that substituted with at least one first substituent selected from calcium (Ca) or strontium (Sr).
The method of claim 1,
Wherein a part of the nickel is substituted with at least one second substituent selected from copper (Cu), cobalt (Co), and manganese (Mn).
A first step of mixing lanthanum and nickel nitrate, ethylene glycol and distilled water to form a mixture;
A second step of forming a sol by mixing citric acid with the mixture made in the first step;
A third step of preparing a gel by heating the sol formed in the second step;
A fourth step of pyrolyzing the gel prepared in the third step; And
And a fifth step of preparing a cathode catalyst by heat-treating the obtained product obtained in the fourth step.
The method of claim 5,
The cathode catalyst manufacturing method for a lithium-air battery, characterized in that it further comprises the step of cooling and grinding the cathode catalyst.
The method of claim 5,
The ethylene glycol is a positive electrode catalyst manufacturing method for lithium-air battery, characterized in that for adding 5 to 50 parts by weight based on 100 parts by weight of distilled water.
The method of claim 5,
The citric acid is a positive electrode catalyst manufacturing method for a lithium-air battery, characterized in that to add 1 to 5 times the number of moles of metal nitrate added in the first step.
The method of claim 5,
The temperature for heating the sol in the third step is a method for producing a cathode catalyst for lithium-air battery, characterized in that 60 ℃ to 80 ℃.
The method of claim 5,
In the fourth step, the thermal decomposition temperature of the gel is a cathode catalyst manufacturing method for a lithium-air battery, characterized in that 200 ℃ to 300 ℃.
The method of claim 5,
In the fifth step, the heat treatment temperature is a lithium-air battery cathode catalyst manufacturing method, characterized in that 500 ℃ to 1000 ℃.
A cathode for a lithium-air battery, comprising a cathode catalyst for a lithium-air battery, a binder and a porous carbon according to any one of claims 1 to 4.
The method of claim 12,
The binder may be selected from the group consisting of carbon black (Ketjen Black), PVdF, vinylidene fluoride / hexafluoropropylene copolymer, polyvinylidene fluoride, polyacrylonitrile, polymethyl methacrylate, polytetrafluoroethylene, Butadiene and a rubber-based polymer. The positive electrode for a lithium-air battery according to claim 1,
A positive electrode for a lithium-air battery according to claim 12;
A negative electrode made of lithium metal or lithium alloy;
A separator disposed between the anode and the cathode; And
A lithium-air battery comprising an electrolytic solution.
15. The method of claim 14,
Wherein the separator comprises one or more materials selected from the group consisting of glass fiber, polyester, Teflon, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), polyethylene and polypropylene. Air battery.
15. The method of claim 14,
Wherein the electrolyte solution comprises a solvent and a lithium salt.
17. The method of claim 16,
The solvent may be at least one selected from the group consisting of propylene carbonate, ethylene carbonate, fluoroethylene carbonate, diethyl carbonate, ethylmethyl carbonate, methylpropyl carbonate, butylene carbonate, benzonitrile, acetonitrile, tetrahydrofuran, 2-methyltetrahydrofuran, Examples of the solvent include lactone, dioxolane, 4-methyldioxolane, N, N-dimethylformamide, dimethylacetamide, dimethylsulfoxide, dioxane, 1,2-dimethoxyethane, sulfolane, dichloroethane, Examples of the organic solvent include at least one selected from the group consisting of nitrobenzene, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, methylpropyl carbonate, methyl isopropyl carbonate, ethylpropyl carbonate, dipropyl carbonate, dibutyl carbonate, diethyleneglycol, dimethylether, dimethyldiglycol, Dimethyltetraglycol, and dimethyltetraglycol. Lithium comprising the material-air battery.
17. The method of claim 16,
The lithium salt is LiPF ₆ , LiBF ₄ , LiSbF ₆ , LiAsF ₆ , LiClO ₄ , LiCF ₃ SO ₃ , Li (CF ₃ SO ₂ ) ₂ N, LiC ₄ F ₉ SO ₃ , LiSbF ₆ , LiAlO ₄ , LiAlCl ₄ , LiN (C _x F _{2x +1} SO ₂ ) (C _y F _{2y +1} SO ₂ ) (where x, y is a natural number), characterized in that it comprises one or two or more selected from the group consisting of LiCl and LiI Lithium-air battery.

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