JP2003109597A - Electrode material and manufacturing method thereof, electrode and battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode material with high charging/discharging capacity and excellent cycle property. SOLUTION: An active material is bound by a binder containing water-soluble aniline group conductive polymer, rubber group latex, and water-soluble polymer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode material suitable for a lithium secondary battery and the like, a method for producing the same, an electrode and a battery.

[0002]

2. Description of the Related Art In order to meet the needs of portable electronic devices, which are becoming smaller and lighter and have higher performance, there is an urgent need to increase the capacity of lithium secondary batteries. Increasing the capacity per unit weight of the active material is of course important for increasing the capacity of the lithium secondary battery, but reduce the proportion of the active material other than the active material in the electrode plate as much as possible and add more active material. It is also important to be able to do so.

Polyvinylidene fluoride (PVdF), which is currently widely used as a binder for negative electrode plates, is N-methyl-2.
-A resin that dissolves in organic solvents such as pyrrolidone.
PVdF is not originally an adhesive, but has good compatibility with a graphite material, and by adding approximately 8% to 10% of graphite, it becomes possible to prepare an electrode plate having a high binding force. However, PVdF covers the active material in a state in which the fibers are densely packed, and thus both the capacity and the efficiency are factors that reduce the battery performance originally possessed by the active material. Further, in order to smoothly insert and release lithium ions into and from the active material, it is a useful means to reduce the impedance of the electrode as much as possible, but generally the binder is a non-conductive material. Therefore, while reducing the amount of binder as much as possible,
It is necessary to improve the conductivity of the binder itself. If the conductive polymer can be incorporated into the binder, it may be possible to obtain battery characteristics that cannot be obtained with conventional binders. Further, PVdF has high adhesive strength, but is poor in flexibility. Therefore, when a material such as natural graphite having a narrow surface spacing and a high expansion / shrinkage rate due to charging / discharging is used as the active material, the bond tends to be broken and the cycle characteristics tend to deteriorate. Therefore, it is necessary to impart elasticity to the binder so as to flexibly absorb expansion and contraction due to charge and discharge. Furthermore, in the case of a solvent-based binder such as PVdF,
Because of problems such as safety and solvent recovery during production, it is desired that the binder be an aqueous binder.

On the other hand, as a water-based binder used for lithium batteries, styrene-butadiene rubber (SB
There are rubber latexes such as R). SBR has a high elasticity, and it is expected to reduce expansion and contraction of the electrode due to charging and discharging by using it together with a thickener such as cellulose. However, these rubber-based latex binders are point-adhesive, The contact area with the active material is smaller than that of PVdF. Therefore, the adhesive strength is weak, the active material is likely to come off from the electrode plate, the binding property between the active materials is deteriorated, and the cycle characteristics tend to be inferior to PVdF. In particular, artificial graphite generally has a small specific surface area and poor wettability, and when a mixture of rubber latex and a thickener is used as a binder for artificial graphite, charging and discharging is performed several hundred times or more. It is difficult to obtain sufficient adhesion to withstand.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is excellent in the binding property between active materials or between an active material and a current collector, has flexibility, and has high charge / discharge. It is an object of the present invention to provide an electrode material having a capacity and excellent cycle characteristics and having no problems of safety and solvent recovery and a method for producing the same, and to provide a negative electrode and a lithium secondary battery having the electrode material.

[0006]

As a result of examining the above problems, the present inventors have found that a binder containing a water-soluble aniline-based conductive polymer and a water-soluble polymer replaces the conventional binder. It was found to be an effective binder. In addition, as a result of further study by the present inventors, when a rubber-based latex was further added to the water-soluble aniline-based conductive polymer and the water-soluble polymer, the flexibility of absorbing expansion and contraction of the active material due to charge and discharge was observed. It has been found that the binder also has excellent properties and can be used to form an electrode having excellent cycle characteristics.

That is, the electrode material of the present invention is an electrode material containing an active material and a binder, wherein the binder is a water-soluble aniline-based conductive polymer, a rubber-based latex, and a water-soluble polymer. It is characterized by including and. A water-based binder generally uses a water-soluble polymer such as cellulose as a thickener, but in the present invention, the water-soluble polymer not only serves as a thickener but also has a water-soluble aniline-based conductive property. It plays a role as a binder that produces high adhesiveness when used in combination with a polymer. Further, by using a rubber-based latex together, flexibility can be improved. In such an electrode material, sufficient binding properties can be provided by using less than half the amount of the binder as compared with the case of using the conventional binder. Therefore, the active material functions effectively, the charge / discharge capacity per unit weight increases, and more active material can be used for the electrode due to the smaller amount of the binder, so that the capacity of the entire battery is reduced. To increase. In addition, by using the rubber-based latex together, the binder is rich in flexibility, so that the expansion and contraction of the active material due to charge and discharge can be absorbed, and an electrode material having excellent cycle characteristics can be obtained. .. Further, since it is a water-based binder, it is possible to solve the problems of safety and solvent recovery.

In the method for producing an electrode material of the present invention, after kneading an active material, a water-soluble aniline-based conductive polymer, a binder containing a rubber-based latex and a water-soluble polymer, and water, It is characterized by being dried. According to such a method for manufacturing an electrode material, sufficient binding properties can be provided by using less than half the amount of the binder as compared with the case of using the conventional binder. Moreover, since the binder is highly flexible, it is possible to absorb expansion and contraction of the active material due to charge and discharge. Further, since the conductive polymer polyaniline is contained, insertion / desorption of lithium ions are smoothly carried out, and cycle deterioration can be suppressed even in charging / discharging at a high current density. Therefore, an electrode material having high charge / discharge capacity and excellent cycle characteristics can be obtained. Moreover, since water is used as the solvent, the problems of safety and solvent recovery can be solved.

Next, the electrode of the present invention is characterized by including any one of the above electrode materials. In this case, an electrode having high energy density and excellent cycle characteristics can be obtained. Especially when this is configured as a negative electrode,
High battery characteristics can be obtained. Further, the battery of the present invention is characterized by including such an electrode as a positive electrode and / or a negative electrode. According to such a battery, it is possible to obtain a battery having high energy density and excellent cycle characteristics.
The battery of the present invention can be configured as a lithium secondary battery, a nickel hydrogen battery, or the like, and particularly when configured as a lithium secondary battery, high battery characteristics can be obtained.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The electrode material of this embodiment is obtained by binding an active material with a binder. As the active material used in this embodiment,
Natural graphite, artificial graphite, natural graphite, artificial graphite, expanded graphite,
Carbon fiber, non-graphite carbons such as fired products of phenolic resin, carbon blacks such as acetylene black, Ketjen black, carbon and graphite materials such as carbon nanotubes, fullerenes, activated carbon, and Al that can be alloyed with Li, Si, Sn, Ag, Bi, Mg, Zn, In, Ge, Pb, P
Metals such as d, Pt, and Ti, compounds containing these elements, or composites of these metals and compounds with carbon and graphite materials, and lithium-containing nitrides as negative electrode materials for lithium secondary batteries and usable materials. However, the material of the present invention may be used as a binder for the positive electrode active material.

The binder used in this embodiment contains all of the water-soluble aniline-based conductive polymer, the water-soluble polymer and the rubber-based latex. As the water-soluble aniline-based conductive polymer, polyaniline sulfonic acid, polyaniline sulfonic acid, polyaniline carboxylic acid and the like can be adopted, but polyaniline sulfonic acid is preferable. Polyaniline sulfonic acid has a strong interaction with a carbon material generally used as a negative electrode material of a lithium secondary battery, and can generate high bondability. Further, polyaniline contained in these water-soluble aniline-based polymers is a conductive polymer, and the impedance of the electrode using this can be reduced as compared with the case of using another polymer binder. A method for producing a water-soluble polymer containing polyaniline is described in, for example, Japanese Patent Laid-Open No. 2000-219739.
Is shown in. Sufficient adhesion cannot be obtained only with the water-soluble aniline conductive polymer and the active material, but by mixing this with the water-soluble polymer, high adhesion between the active material and between the active material and the current collector can be achieved. The force can be obtained while at the same time providing the viscosity and coatability required to create a uniform electrode. By introducing a water-soluble polymer, the adhesiveness is improved, but the flexibility of the electrode is impaired. Therefore,
By using rubber-based latex in combination with water-soluble aniline-based conductive polymer and water-soluble polymer, the flexibility of the electrode is greatly improved, and the expansion and contraction of the electrode due to charge and discharge is flexibly absorbed, resulting in excellent results. It is possible to achieve excellent cycle characteristics. In addition, since the binder has sufficient adhesiveness in a smaller amount than the conventional binders, it is possible to obtain a high battery capacity by effectively utilizing the active material.

The water-soluble aniline-based conductive polymer is preferably contained in the electrode material in a proportion of 0.1 to 10% by weight. If it is less than 0.1% by weight, the binding force between the active materials and between the active material and the current collector is reduced, which is not preferable, and the amount of more than 10% by weight is lowered and the high current characteristics are deteriorated due to an increase in impedance. It is not preferable. Further, the coating property of the coating material composed of the binder, the active material and water on the current collector is also deteriorated, which is not preferable. Further, a more preferable ratio is 0.3 to 2% by weight.

As the water-soluble polymer, polyvinyl alcohol, carboxymethyl cellulose, polyvinyl pyrrolidone, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyacrylamide, poly-N-isopropylacrylamide, poly-N, N-dimethylacrylamide. , Polyethyleneimine, polyoxyethylene, poly (2-methoxyethoxyethylene), poly (3
-Morphinyl ethylene), polyvinyl sulfonic acid,
Polyvinylidene fluoride, amylose and the like can be mentioned, but polyvinyl alcohol is preferable.
Polyvinyl alcohol is free from deterioration and deposits associated with charge and discharge, can be stably charged and discharged, and can achieve high charge and discharge capacity and excellent cycle characteristics.

The water-soluble polymer is preferably contained in the electrode material in a ratio of 0.1 to 10% by weight. If it is less than 0.1% by weight, the viscosity of the coating material comprising the binder, the active material and water is too low to make it difficult to form a uniform electrode, and the binding property is also lowered. On the other hand, if the content is more than 10% by weight, the viscosity will be excessively increased, the coatability will be remarkably lowered, the flexibility of the electrode will be lowered, and the ratio of the active material in the electrode will be reduced, resulting in reduction of the battery capacity. It is not preferable. A more preferable ratio is 0.3 to 3% by weight.
Is.

As the rubber latex, styrene-butadiene rubber, nitrile-butadiene rubber, methylmethacrylate-butadiene rubber, chlorobrene rubber or the like can be adopted, but styrene-butadiene rubber is preferable. Thereby, a highly flexible electrode can be prepared and excellent cycle characteristics can be achieved.

This rubber-based latex is preferably contained in a proportion of 0.1 to 10% by weight based on the electrode material. If it is less than 0.1% by weight, sufficient flexibility cannot be obtained, and if it is more than 10% by weight, the electrode is hardened. In addition, the total amount of the binder increases, which causes a decrease in battery capacity, which is not preferable.

The total amount of the water-soluble aniline-based conductive polymer, the water-soluble polymer and the rubber-based latex is 10% by weight or less, more preferably 5% or less with respect to the electrode material. Preferably. When it is more than 10% by weight, the electrode impedance increases, the battery capacity decreases, and the flexibility of the electrode is impaired, which is not preferable.

The electrode material of this embodiment includes, in addition to the active material and the binder, a conductive agent such as carbon black and vapor grown carbon fiber, and a metal, a metal compound, and an oxide for improving the battery characteristics. Other ingredients such as things may be added if necessary.

The electrode material of the present embodiment can be manufactured by drying a paste prepared by kneading the electrode material and water.
This drying is actually done on the current collector of the negative electrode.
That is, a negative electrode can be formed by applying a paste prepared by kneading an electrode material and water onto a current collector made of a metal foil or a metal net and drying the paste. In this drying,
When the water-soluble polymer used for the binder is polyvinyl alcohol, the drying temperature is preferably 150 ° C or lower. Drying at a temperature higher than 150 ° C. is not preferable because the polyvinyl alcohol is decomposed and the electric resistance derived from the water-soluble aniline-based polymer increases.

According to the electrode material of the present embodiment, it is possible to provide sufficient binding property by using less than half the amount of the binder as compared with the case of using the conventional binder. for that reason,
A high battery capacity can be obtained. Further, since it is highly flexible, it can be an electrode material having excellent cycle characteristics. Further, since the conductive polymer polyaniline is contained, insertion / desorption of lithium ions are smoothly carried out, and cycle deterioration can be suppressed even in charging / discharging at a high current density. Further, since it is a water-based binder, it is possible to solve the problems of safety and solvent recovery. Although the electrode material of the above embodiment is described as a negative electrode material, it is needless to say that the electrode material can be configured as a positive electrode material by using the binder.

Next, the negative electrode of this embodiment is obtained by applying the electrode material of this embodiment onto the current collector and drying it, as described above. The negative electrode is not particularly limited, but is attached to the bottom of the negative electrode can that also serves as the negative electrode terminal.

Further, the lithium secondary battery of this embodiment is
This negative electrode, a positive electrode capable of inserting and extracting lithium, and an organic electrolyte can be used. Examples of the positive electrode include LiMn ₂ O ₄ and LiCo
O ₂ , LiNiO ₂ , LiFeO ₂ , V ₂ O ₅ , TiS, M
Examples thereof include a positive electrode material capable of inserting and extracting lithium such as oS and a positive electrode material such as an organic disulfide compound or an organic polysulfide compound. The positive electrode is also not particularly limited, but is attached to the bottom of the positive electrode can that also serves as the positive electrode terminal.

As the organic electrolyte, for example, an organic electrolyte solution in which a lithium salt is dissolved in an aprotic solvent can be exemplified. Examples of the aprotic solvent include propylene carbonate, ethylene carbonate, butylene carbonate, benzonitrile, acetonitrile, tetrahydrofuran, 2-methyltetrahydrofuran, γ-butyrolactone, dioxolane, 4-methyldioxolane, N, N.
-Dimethylformamide, dimethylacetamide, dimethylsulfoxide, dioxane, 1,2-dimethoxyethane, sulfolane, dichloroethane, chlorobenzene,
Aprotic solvent such as nitrobenzene, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, methyl propyl carbonate, methyl isopropyl carbonate, ethyl butyl carbonate, dipropyl carbonate, diisopropyl carbonate, dibutyl carbonate, diethylene glycol, dimethyl ether, etc., or these solvents A mixed solvent obtained by mixing two or more of the above can be exemplified, and particularly propylene carbonate,
It is preferable that at least one of ethylene carbonate and butylene carbonate is always contained and at least one of dimethyl carbonate, methyl ethyl carbonate and diethyl carbonate is always contained.

Further, as the lithium salt, 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 , Li
_{N (C x F 2x + 1} SO 2) (C y F 2 y _tens 1 SO ₂₎ (provided that x, y is a natural number), LiCl, by mixing one or more lithium salts of such LiI The following can be exemplified, and one containing any one of LiPF ₆ and LiBF _{4 is} particularly preferable. In addition to this, it is also possible to use a conventionally known organic electrolytic solution for a lithium secondary battery.

The organic electrolyte is a so-called polymer such as a polymer obtained by mixing any of the above-mentioned lithium salts with a polymer such as polyethylene oxide or polyvinyl alcohol, or a polymer having a high swelling property impregnated with an organic electrolyte solution. An electrolyte may be used.

The lithium secondary battery of the present embodiment is subjected to an electrolytic treatment in which either or both of the positive electrode and the negative electrode described above absorb lithium, and then a positive electrode can to which the positive battery is attached. , The negative electrode can with the negative electrode attached,
It is assembled by encapsulating an organic electrolyte and fitting them together through an insulating packing.

According to the negative electrode and the lithium secondary battery of the present embodiment, since the electrode material of the present embodiment is used as a lithium carrier, a lithium secondary battery having a high energy density and excellent cycle characteristics can be obtained. Can be configured.

Although a coin-type lithium secondary battery is used in the above embodiment, various shapes such as a cylindrical shape, a prismatic shape, and a sheet-type can be adopted.

[0029]

Example 1 96% by weight of natural graphite, 2% by weight of polyvinyl alcohol (PVA) and 1% by weight of polyaniline sulfonic acid (PASSA) as a conductive coating liquid aquaPASS (produced by Mitsubishi Rayon Co., Ltd.). Below is PASS
Is abbreviated. ) And styrene-butadiene rubber (SB
R) and water are mixed and stirred with a stirrer for 15 minutes,
A paste-like negative electrode mixture was prepared and applied to a copper foil. This was pre-dried at 60 ° C. for 30 minutes and then vacuum dried at 120 ° C. for 24 hours. Thus, the electrode material having a thickness of 100 μm was laminated on the copper foil. Then, the copper foil laminated with the electrode material was punched into a circle having a diameter of 13 mm and rolled at a pressure of 1 ton / cm ² to obtain a negative electrode. This negative electrode was used as a working electrode, a metal lithium foil punched in a circle (positive electrode) was used as a counter electrode, a separator made of a porous polypropylene film was inserted between the working electrode and the counter electrode, and dimethyl carbonate (DMC) was used as an electrolytic solution. A coin-type test cell was prepared by using LiPF ₆ dissolved in a mixed solvent of diethyl carbonate (DEC) and ethylene carbonate (EC) as a solute to a concentration of 1 (mol / L).

A charge / discharge test was conducted using this test cell. First, the charge / discharge current density is 0.2 C, the charge end voltage is 0 V (L i / L i ⁺ ), and the discharge end voltage is 1.5 V.
The charge / discharge test with (Li / Li ⁺ ) was performed 4 times. Next, the charge / discharge current density is set to 1C, and the charge end voltage is 0V.
(L i / L i ⁺ ), the discharge end voltage is 1.5 V (L i /
The charge and discharge test with Li ⁺ ) was performed 50 times. Note that all charging was performed at constant current / constant voltage, and the termination current of constant voltage charging was 0.01C. Then, the discharge capacity and charge / discharge efficiency in the first cycle (0.2 C) of the electrode material were obtained. Further, the discharge capacity at the fifth cycle (first cycle of 1C) was obtained. Furthermore, a capacity ratio (54th / 1st) was obtained by dividing the discharge capacity at the 54th cycle (50th cycle of 1C) by the discharge capacity at the 1st cycle. The results are shown in Table 1.

[Example 2] 95% by weight of natural graphite and 2
A coin type test cell was carried out in the same manner as in Example 1 except that a paste-like negative electrode mixture was prepared by mixing PVA of 1% by weight, PASS of 1% by weight, SBR of 2% by weight, and water. It was created. Then, the same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are shown in Table 1.
Are also shown.

[Example 3] 94% by weight of natural graphite and 2
A coin-shaped test cell was prepared in the same manner as in Example 1 except that a paste-like negative electrode mixture was prepared by mixing 1% by weight of PVA, 1% by weight of PASS, 3% by weight of SBR, and water. It was created. Then, the same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are shown in Table 1.
Are also shown.

Comparative Example 1 90% by weight of natural graphite and 1
A coin type test was performed in the same manner as in Example 1 except that 0% by weight of polyvinylidene fluoride (PVdF) and N-methyl-2-pyrrolidone (NMP) were mixed to prepare a mixture for a paste-like negative electrode. Created a cell. Then, the same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are also shown in Table 1.

Comparative Example 2 96% by weight of natural graphite and 2
A coin type test cell was prepared in the same manner as in Example 1 except that the paste-like negative electrode mixture was prepared by mixing PVA (wt%), PASS (wt%), and water. Then, the same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are also shown in Table 1.

Example 4 96% by weight of artificial graphite and 2
A coin-shaped test cell was prepared in the same manner as in Example 1 except that a paste-like negative electrode mixture was prepared by mixing PVA (wt%), PASS (wt%), SBR (wt%), and water. It was created. Then, the same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are shown in Table 1.
Are also shown.

[Comparative Example 3] 96% by weight of artificial graphite and 3
A coin type test cell was prepared in the same manner as in Example 1 except that the paste-like negative electrode mixture was prepared by mixing SBR (1 wt%), CMC (1 wt%) and water. And
The same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are also shown in Table 1.

[Comparative Example 4] 90% by weight of artificial graphite and 1
A coin type test cell was prepared in the same manner as in Example 1 except that 0% by weight of PVdF and NMP were mixed to prepare a paste-like negative electrode mixture. Then, the same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are also shown in Table 1.

[Comparative Example 5] 96% by weight of artificial graphite and 2
A coin type test cell was prepared in the same manner as in Example 1 except that the paste-like negative electrode mixture was prepared by mixing PVA (wt%), PASS (wt%), and water. Then, the same charge-discharge test as in Example 1 was performed on this coin-type test cell. The results are also shown in Table 1.

[0039]

[Table 1]

As shown in Table 1, in Example 1 using natural graphite as an active material, PVA 2% as a binder and 1% each of PASS and SBR, Comparative Example 1 using PVdF as a binder was used. Higher discharge capacity and higher charge / discharge efficiency were obtained in comparison. Also, the capacity retention rate was remarkably improved. In addition, the improvement of these battery characteristics is due to PVA
And PASS were each more prominent than Comparative Example 2 using 2%. This is considered to be because the addition of SBR imparts flexibility to the binder and can absorb expansion and contraction of the active material due to charge and discharge.

In Examples 2 and 3, PVA and P were used as binders.
Although ASS and SBR are used, the amount of SBR used is changed. In all cases, the improvement in battery characteristics was not obtained as in Example 1. This is because when the amount of SBR is large,
It is considered that the conductivity of PASS is slightly lowered.

Next, artificial graphite is used as the active material. Since artificial graphite generally has a smaller specific surface area than natural graphite and often has poor wettability, SB is used.
It is difficult to obtain sufficient binding properties only with a point contact binder such as R. In fact, when Comparative Example 3 using SBR and CMC is compared with Comparative Example 4 using PVdF, all the characteristics are significantly lowered, which supports this.
However, even if it is an aqueous system, when PVA, PASS and SBR are used as in Example 4, the same discharge capacity and charge / discharge efficiency as in Comparative Example 4 using PVdF can be obtained, and more than in Comparative Example 4. A high capacity retention rate was obtained. It is considered that this is because PASS coats the active material in the electrode to obtain high adhesiveness and also improves the wettability of the surface so that the active material and the binder are well compatible with each other. Further, the improvement in these battery characteristics was more remarkable than that in Comparative Example 5 in which PVA and PASS were used in an amount of 2% each. This is considered to be because the addition of SBR imparts flexibility to the binder and can absorb expansion and contraction of the active material due to charge and discharge.

[0043]

As described above in detail, according to the electrode material and the method for producing the same of the present invention, less than half the amount of the binder is used as compared with the case of using the charged binder. Can give a sufficient binding property. Moreover, since the binder is highly flexible, it is possible to absorb expansion and contraction of the active material due to charge and discharge. Therefore, an electrode material having high charge / discharge capacity and excellent cycle characteristics can be obtained. Further, since the conductive polymer polyaniline is contained, insertion / desorption of lithium ions are smoothly carried out, and cycle deterioration can be suppressed even in charging / discharging at a high current density. Further, since it is a water-based binder, it is possible to solve the problems of safety and solvent recovery. Further, according to the electrode and the battery of the present invention, a battery having a high energy density and excellent cycle characteristics can be constructed.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Teru Takagura             2-7 Sugasawa-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Stock             Samsung Yokohama Research Institute Co., Ltd. (72) Inventor             508 Samsung, Sanan-dong, Cheonan, Republic of Korea             Inside SDI Corporation F-term (reference) 5H029 AJ03 AJ05 AJ12 AK02 AK03                       AK05 AK16 AL06 AL07 AL08                       AL12 AM02 AM03 AM04 AM05                       AM07 BJ03 CJ02 CJ08 DJ08                       DJ16 EJ12 EJ13 HJ01                 5H050 AA07 AA08 AA15 AA17 BA17                       CA02 CA07 CA08 CA09 CA11                       CA26 CB07 CB08 CB09 CB12                       DA11 EA23 EA26 FA17 GA02                       GA10 HA01

Claims (11)

[Claims] 1. An electrode material containing an active material and a binder, wherein the binder contains a water-soluble aniline-based conductive polymer, a rubber-based latex, and a water-soluble polymer. Electrode material. 2. The electrode material according to claim 1, wherein the water-soluble aniline-based conductive polymer is polyaniline sulfonic acid. 3. The electrode according to claim 1, wherein the water-soluble aniline-based conductive polymer is contained in a ratio of 0.1 to 10% by weight with respect to the electrode material. material. 4. The electrode material according to any one of claims 1 to 3, wherein the rubber-based latex is contained in a ratio of 0.1 to 10% by weight with respect to the electrode material. 5. The electrode material according to claim 1, wherein the water-soluble polymer is polyvinyl alcohol. 6. The electrode material according to claim 1, wherein the water-soluble polymer is contained in a proportion of 0.1 to 10% by weight with respect to the electrode material. . 7. An electrode material characterized by kneading an active material, a binder containing a water-soluble aniline-based conductive polymer, a rubber-based latex and a water-soluble polymer, and water and then drying the mixture. Production method. 8. The method for producing an electrode material according to claim 7, wherein the water-soluble aniline-based conductive polymer is polyanilinesulfonic acid. 9. The method for producing an electrode material according to claim 7, wherein the water-soluble polymer is polyvinyl alcohol. 10. An electrode comprising the electrode material according to any one of claims 1 to 6. 11. A battery comprising the electrode according to claim 10.