Binder resin emulsion for energy device electrode, and energy device electrode and energy device using the same

A binder resin and energy technology, applied in battery electrodes, electrolytic capacitors, hybrid capacitor electrodes, etc., can solve the problems of difficulty in ion adsorption and desorption, increase in electrode resistance of capacitors, etc., achieve low resistance, improved charge and discharge characteristics, Excellent penetration effect

Inactive Publication Date: 2008-01-23
HITACHI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to lithium batteries, there is a problem that the binder resin composition is coated on the activated carbon, and the adsorption and desorption of ions becomes difficult. As a result, the resistance of the electrode of the obtained capacitor increases, and there is a problem in terms of long-term reliability.

Method used

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  • Binder resin emulsion for energy device electrode, and energy device electrode and energy device using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] Prepare a 2 L separable flask equipped with a stirrer, thermometer and condenser. An ethylene-methacrylic acid copolymer (MFR: 60 g / 10 minutes, ethylene unit / methacrylic acid unit=80 / 20 (mass ratio), melting point: 87° C.) 150 g, purified water 826.7 g, and N, N-dimethylethanolamine 23.3 g as a neutralizing agent (the amount corresponding to neutralizing 75 mol% of the carboxyl groups of the copolymer) . After raising the temperature to 95° C. while stirring the contents of the flask, it was kept at the same temperature for 1 hour, and the copolymer was water-dispersed and emulsified by neutralization reaction. Next, the temperature was lowered to 88° C. and kept at the same temperature for 3 hours to complete the neutralization reaction, and then cooled to room temperature to obtain the binder resin emulsion of the present invention. The average particle diameter of the obtained emulsion was about 0.13 μm, and the non-volatile matter after drying under normal pressu...

Embodiment 2

[0162] According to making the dry mass of the mixture layer be about 12.5mg / cm 2 , the slurry prepared in the above test (1) was uniformly coated on one side surface of a negative electrode current collector (manufactured by Hitachi Electric Cable Co., Ltd., rolled copper foil, thickness 14 μm, 200×100 mm) with a micro coater. Then, it dried under normal pressure at 80 degreeC for 1 hour, and formed the mixture layer. Then, according to making the bulk density of the mixture layer be 1.5g / cm 3 or 1.8g / cm 3 , After compression molding with a roller press, punch a 9mmΦ hole with a punching machine. This was subjected to vacuum heat treatment at 120° C. for 5 hours to prepare a negative electrode in which a mixture layer made of the binder resin emulsion of the present invention and an active material was provided on the surface.

Embodiment 3

[0166] According to making the dry mass of the mixture layer be about 29mg / cm 2 , the slurry prepared in the above test (1) was evenly coated on both sides of the negative electrode current collector (manufactured by Hitachi Electric Cable Co., Ltd., rolled copper foil, thickness 10 μm, 200×100 mm) with a transfer roller. Then, the coating is dried for 5 minutes with a conveyor oven at 120° C. to form a mixture layer, and the bulk density of the mixture layer is 1.8 g / cm 3 , Compression molding with a roller press. It was cut into a 56 mm square to make a short thin sheet, which was subjected to vacuum heat treatment for 5 hours in a vacuum dryer at 120° C. to make a negative electrode.

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Abstract

A binder resin emulsion for energy device electrodes is provided that is used in energy device electrodes and more particularly that is used as a binder to dispose an active material on the current collector of such an electrode. An energy device electrode and energy device that use this emulsion are also provided. A binder resin emulsion for energy device electrodes is used that comprises: a copolymer of an alpha,beta-unsaturated carboxylic acid and an alpha-olefin that has been neutralized with a neutralizing agent; and water. Also, an energy device electrode and an energy device that use this binder resin emulsion are utilized.

Description

technical field [0001] The present invention relates to a binder resin emulsion for an energy device electrode, an energy device electrode and an energy device using the same. Background technique [0002] Conventionally, energy devices such as lithium-ion secondary batteries (hereinafter referred to as "lithium batteries") and electric double layer capacitors (hereinafter referred to as "capacitors") have been used as means for storing electricity. [0003] Lithium batteries have the disadvantages of weak overcharge and discharge ability and short life, but have the advantages of no memory effect and high energy density, and are widely used as power supplies for portable information terminals such as notebook computers, mobile phones, and PDAs. [0004] On the other hand, a capacitor is an energy device that utilizes the electrostatic capacity of the electric double layer formed at the interface between the active material of the electrode and the electrolyte solution. Comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01G9/016H01G9/058C08J3/03H01G11/22H01G11/24H01G11/38H01G11/42H01G11/86
CPCY02E60/12H01G11/38H01M4/622H01M4/621Y02E60/13H01G9/058Y02E60/10H01M4/62H01G11/86
Inventor 铃木健司真下清孝
Owner HITACHI CHEM CO LTD
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