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Method of producing electrode for capacitor

A manufacturing method and capacitor technology, which is applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, capacitors, etc., can solve problems such as the difficulty of thinning the electrode layer, and achieve the effect of realizing light weight and miniaturization

Active Publication Date: 2007-01-03
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the electrode layer needs to have a thickness sufficient to maintain the mechanical strength of the sheet-like shape, and it is difficult to reduce the thickness of the electrode layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (Preparation of coating liquid for inner coating)

[0079] 60 g of acetylene black (manufactured by Denka Kogyo Co., Ltd., trade name: denka black, BET specific surface area: 67m 2 / g), and 40 g of fluororubber (manufactured by Dupon Corporation, trade name: Viton-GF) were dropped into 186 g of methyl isobutyl ketone (MIBK), and mixed for 45 minutes using a planetary mixer, and the mixture was further mixed. 964 g of MIBK was added and stirred for 1 hour to obtain a slurry. The obtained slurry was put into a sand mill, and zirconia beads (manufactured by Nichikato-Co., Ltd., zirconia ZrO 2 , particle size: 0.3 mm), the residence time is 2 minutes of dispersion treatment. In addition, at this time, the peripheral speed of the disperser was 10 m / sec, the flow rate was 138 g / min (160 ml / min), and the bead filling rate was 80% by weight. In this way, a coating liquid for an undercoat layer was prepared. The coating liquid for an undercoat layer maintains a good dispersi...

Embodiment 2～7、 comparative example 1

[0102] In addition to changing the drying conditions of the electrode coating layer as shown in Table 1, and respectively changing the amount of residual solvent in the entire layer (both inner coating layers + both electrode coating layers) after drying as shown in Table 1, In the same manner as in Example 1, an electrode for an electric double layer capacitor was produced. For each of the obtained electrodes, the measurement of the electrode density was performed, and the determination of contamination of the guide roller was also performed. The results are shown in Table 1.

[0103] Electrode Coating Layer

[0104] As can be seen from Table 1, the electrodes obtained in Examples 1 to 7 of the present invention have high electrode densities and are preferable. On the other hand, the electrode obtained in Comparative Example 1 was poor in electrode density. The amount of residual solvent in the entire layer after drying was as high as 37% by weight, and contamin...

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PUM

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Abstract

The present invention provides a method of producing an electrode for an electric double layer capacitor, which yields the electrode with an electrode layer having a higher density by calendering treatment. A method of producing an electrode for a capacitor, which comprises at least a current collector and an electrode layer on the current collector, the method comprising the steps of: applying an electrode layer coating material which comprises at least a carbon material, a binder and a solvent, onto the current collector to form an electrode coating layer; drying the electrode coating layer on the current collector to set the amount of the solvent remaining in the electrode coating layer within a range of 5 to 35% by weight of the layer; and subjecting the electrode coating layer after the drying to calendering treatment to yield an electrode layer.

Description

technical field [0001] The present invention relates to a method for producing an electrode for an electric double layer capacitor. Background technique [0002] Electrochemical capacitors such as electric double layer capacitors are expected as backup power supplies for power supplies such as portable devices (small electronic devices), auxiliary power supplies for electric vehicles or hybrid vehicles, etc. Various studies of its performance. [0003] In particular, with recent reductions in size and weight of portable devices, there has been a demand for further reductions in size and weight of capacitors while maintaining sufficient performance required for devices requiring electric double layer capacitors. That is, it is required to increase the energy density per unit mass and the energy density per unit volume of the electric double layer capacitor. Therefore, there is a demand for downsizing and weight reduction of electrodes used in electric double layer capacitor...

Claims

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Application Information

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IPC IPC(8): H01G9/058H01G11/22B05D5/12H01G11/24H01G11/26H01G11/28H01G11/42H01G11/66H01G11/70H01G11/84H01G11/86
CPCH01G11/86Y02T10/7022Y02E60/13H01G11/38H01G9/058H01G11/28Y02T10/70
Inventor 桧圭宪片井一夫宫木阳辅田中英树
Owner TDK CORPARATION
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