KR19980059088A - Manufacturing method of active material composition for battery electrode plate - Google Patents

Abstract

The active material composition for a battery electrode plate prepared by mixing a conductive agent and a fluorocarbon solution, and mixing and stirring the mixture, a thickener and a binder can increase the dispersing force of the conductive agent and increase the efficiency of the conductive agent. Therefore, the input amount of the conductive agent can be reduced as a whole. Therefore, there is an effect of increasing the capacity per unit volume of the negative electrode.

Description

Manufacturing method of active material composition for battery electrode plate

[Industrial use]

TECHNICAL FIELD This invention relates to the manufacturing method of the active material composition for battery pole plates, and it is related with the manufacturing method of the active material composition for battery pole plates which can manufacture a high capacity battery in detail.

[Prior art]

Recently, with the trend toward miniaturization and lightening of new portable electronic devices such as camera-integrated VTRs, audio, laptop personal computers, portable telephones, and the like, there is a need for a technology for increasing the performance and capacity of batteries used as power sources for these devices. In particular, efforts are being made to develop technologies that reduce manufacturing costs of these batteries, particularly in economic terms. Generally, batteries include primary cells used for single use, such as manganese batteries, alkaline batteries, mercury batteries, and silver oxide batteries, Ni-MH (nickel-metal hydride) batteries using lead-acid batteries and metal hydrides as negative active materials, and sealed types. Rechargeable batteries such as nickel-cadmium batteries and lithium-metal batteries, lithium-ion batteries (LIB: Lithium Ion Battery), lithium group batteries such as Lithium Polymer Battery (LPB), and the like; It can be divided into fuel cell, solar cell and the like.

Among them, primary batteries have a small capacity, short lifespan, and cannot be recycled, causing environmental pollution. On the other hand, secondary batteries can be recharged and used for a long time, and voltage is much higher than that of primary batteries. It is excellent in terms of efficiency and efficiency, and generates less waste, which is also excellent in environmental protection.

Among the secondary batteries described above, nickel-based batteries are most used because they have the most established recycling technology and are excellent in environmental protection, and are capable of high performance of batteries.

The electrode plate of the nickel-based battery is manufactured by attaching an active material to a current collector. In order to attach the active material to the current collector, a slurry having a constant viscosity to which a thickener and a binder are added should be prepared. In addition, since the added thickener and the binder are insulators, the conductive agent must be added together to increase the conductivity of the electrode plate and the utilization rate of the alloy. Therefore, the slurry for the negative electrode of the nickel-based battery has been used to prepare a slurry having a constant viscosity by stirring a metal powder or carbon compound powder with water with a predetermined amount of alloy, binder and thickener as a conductive agent. However, since it is difficult to evenly disperse the carbon powder added as the conductive agent in the slurry, there is a problem in that a larger amount of carbon is required than the amount required for battery performance.

The present invention is to solve the above problems, an object of the present invention is to disperse the conductive agent evenly can reduce the content of the conductive agent, the composition for the negative electrode of the nickel-based battery that can manufacture a battery of high capacity It is to provide a method for producing.

[Means for solving the problem]

In order to achieve the above object, the present invention is to mix the conductive agent and the fluorine carbon solution and 200 to 1000 parts by weight of the mixture, 0.1 to 0.7 parts by weight of the thickener, 0.1 to 1 parts by weight of the binder and 100 parts by weight of the alloy It provides the manufacturing method of the active material composition for battery electrode plates containing the process of stirring. In the above production method, it is more preferable to mix the mixture at 400 to 800 parts by weight, the thickener to 0.2 to 0.3 part by weight, and the binder to 0.6 to 0.8 part by weight.

Moreover, the electrically conductive agent for battery pole plates disperse | distributed to the fluorocarbon solution is also provided.

In the present invention described above, the conductive agent is preferably a carbon compound selected from the group consisting of Caten black, carbon black and graphite.

In the present invention, the fluorine carbon is C ₃ F ₈ , C ₄ F ₁₀ , C ₅ F ₁₂ , C ₅ F ₁₁ NO, C ₆ F ₁₄ , C ₇ F ₁₆ , C ₈ F ₁₈ , CCl ₃ F, CCl It is preferably selected from the group consisting of ₂ F ₂ , C ₂ F ₃ Cl ₂ , C ₂ Cl ₃ F ₄ and C ₂ ClF ₅ , in particular the group consisting of C ₆ F ₁₄ , C ₇ F ₁₆ and C ₈ F ₁₈ It is more preferable to select from among.

In the present invention described above, it is preferable to use an aqueous solution of 0.01 to 5% by weight, more preferably 0.01 to 0.02% by weight of the fluorine carbon solution.

EXAMPLE

Hereinafter, preferred examples and comparative examples of the present invention are described by taking a nickel-hydrogen battery as an example. However, the following examples are only one preferred embodiment of the present invention and the present invention is not limited to the following examples.

(Example 1)

0.2 g of Catjen Black was dispersed in a perfluoro carbon solution. Subsequently, 0.2 g of carboxymethylcellulose was added to 100 g of hydrogen storage alloy as a thickener and 600 ml of the dispersion was stirred with a conductive agent to prepare a negative electrode composition, and the fluorine carbon solution was dried. Subsequently, 0.8 g of SBR was added to the binder together with 16 ml of water, followed by stirring to prepare a negative electrode slurry.

(Comparative Example 1)

To 100 g of hydrogen storage alloy, 0.8 g of SBR as a binder, 0.2 g of carboxymethylcellulose as a thickener, and 0.7 g of Ketjen Black as a conductive agent were added to 16 ml of water and stirred to prepare a composition for a negative electrode.

(Comparative Example 2)

To 100 g of hydrogen storage alloy, 1 g of SBR as a binder, 0.2 g of carboxymethylcellulose as a thickener, and 0.2 g of blackened black as a conductive agent were added to 16 ml of water and stirred to prepare a negative electrode composition.

A cylindrical 4 / 5A, 1800 mAh battery was prepared using the composition for negative electrodes prepared by the above-described examples and comparative examples. The amount of conductive agent input, capacity per unit volume, and internal resistance of the battery were measured, and the results are shown in Table 1 below.

Conductive Agent Input [%] Utilization [%] Example 1 0.2 110 Comparative Example 1 0.7 110 Comparative Example 2 0.2 98

According to the present invention, the carbon compound used as the conductive agent is dispersed in the fluorine carbon solution in advance to improve the dispersing power of the conductive agent, thereby reducing the amount of the conductive agent to be added, and consequently, the capacity per square of the negative electrode can be increased.

Since the fluorine carbon solution used in the present invention is a stable material that does not participate in the battery reaction at all, it does not participate in the electrochemical reaction, and the surface tension is mostly 10 dyne / cm, which is considerably low. It has a high volatility, and after being added to the slurry, all of them are volatilized and blown off during stirring, which does not give any additional effect to the battery. Therefore, since the efficiency of the conductive agent to be introduced is improved, it is possible to reduce the amount of the conductive agent as a whole. Accordingly, there is an effect of increasing the capacity per unit volume of the negative electrode.

The production method of the active material composition for a battery pole plate of the present invention is not only a nickel-hydrogen battery, but also a secondary battery such as a manganese battery, a secondary battery such as a nickel-based battery, a lithium-based battery, a fuel cell, a solar cell, and the like. Applicable

Claims (10)

Mixing the conductive agent and the fluorocarbon solution, and mixing and stirring the mixture 200 to 1000 parts by weight, the thickener 0.1 to 0.7 parts by weight, the binder 0.1 to 1 part by weight and the alloy 100 parts by weight of the active material composition Manufacturing method. The method for producing an active material composition for a battery electrode plate according to claim 1, wherein the conductive agent is a carbon compound. The method of claim 2, wherein the carbon compound is selected from the group consisting of Caten black, carbon black, and graphite. The method of claim 1, wherein the fluorine carbon is C ₃ F ₈ , C ₄ F ₁₀ , C ₅ F ₁₂ , C ₅ F ₁₁ NO, C ₆ F ₁₄ , C ₇ F ₁₆ , C ₈ F ₁₈ , CCl ₃ F, A method for producing an active material composition for a battery electrode plate, which is selected from the group consisting of CCl ₂ F ₂ , C ₂ F ₃ Cl ₂ , C ₂ Cl ₃ F _4, and C ₂ ClF ₅ . The method of claim 4, wherein the fluorine carbon is selected from the group consisting of C ₆ F ₁₄ , C ₇ F _16, and C ₈ F ₁₈ . The method of claim 1, wherein the fluorine carbon solution is a 0.01-5% by weight aqueous solution. A conductive agent for battery electrode plates dispersed in a fluorine carbon solution. The method of claim 7, wherein the fluorine carbon is C ₃ F ₈ , C ₄ F ₁₀ , C ₅ F ₁₂ , C ₅ F ₁₁ NO, C ₆ F ₁₄ , C ₇ F ₁₆ , C ₈ F ₁₈ , CCl ₃ F, CCl ₂ F ₂ , C ₂ F ₃ Cl ₂ , C ₂ Cl ₃ F ₄ And C ₂ ClF _{5 It} is selected from the group consisting of conductive agents for battery electrode plates. The conductive agent for a battery pole plate according to claim 8, wherein the fluorine carbon is selected from the group consisting of C ₆ F ₁₄ , C ₇ F _16, and C ₈ F ₁₈ . The conductive agent for a battery electrode plate according to claim 1, wherein the fluorine carbon solution is 0.01 to 5 wt% aqueous solution.