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Binder for electrochemical element electrode, particle composite for electrochemical element electrode, electrochemical element electrode, electrochemical element, and manufacturing method of electrochemical element electrode

A technology of electrochemical components and chemical components, applied in the manufacture of hybrid/electric double-layer capacitors, electrical components, battery electrodes, etc., can solve problems such as difficulty in improving productivity and rising costs, achieve excellent productivity, realize resistance, Excellent thickness accuracy and flexibility

Active Publication Date: 2018-07-24
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since these methods require energy for drying the polymer film and removing the solvent from the slurry for coating electrodes, there are cases where the cost increases and it is difficult to improve productivity.

Method used

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  • Binder for electrochemical element electrode, particle composite for electrochemical element electrode, electrochemical element electrode, electrochemical element, and manufacturing method of electrochemical element electrode
  • Binder for electrochemical element electrode, particle composite for electrochemical element electrode, electrochemical element electrode, electrochemical element, and manufacturing method of electrochemical element electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] (Manufacture of Particulate Polymer 1 for Negative Electrodes)

[0136] Add 78 parts of styrene (hereinafter referred to as "ST"), 19 parts of 1,3-butadiene (hereinafter referred to as "BD"), itaconic acid (hereinafter referred to as 3 parts of "IA"), 0.4 parts of alkyl diphenyl ether disulfonate (DOWFAX (registered trademark) 2A1, manufactured by Dow Chemical Co., Ltd.) 0.3 parts of tertiary dodecyl mercaptan (hereinafter referred to as "TDM") as a transfer agent and 0.5 parts of potassium persulfate as a polymerization initiator were sufficiently stirred, and then heated to 75° C. to initiate polymerization. When the polymerization conversion rate reached 96%, cooling was performed to stop the reaction, and an aqueous dispersion of the negative electrode particulate polymer 1 (styrene-butadiene copolymer; hereinafter also abbreviated as "SBR") was obtained. The minimum film forming temperature of the particulate polymer 1 for negative electrodes was 55° C., the glass...

Embodiment 2

[0150] (Manufacture of Particulate Polymer 2 for Negative Electrodes)

[0151] Add 74.5 parts of styrene, 22.5 parts of 1,3-butadiene, 3 parts of itaconic acid, alkyl diphenyl ether disulfonate (DOWFAX (registered trademark) 2A1, manufactured by DOW Chemical Company) 0.4 parts in terms of solid content equivalents, 150 parts of ion-exchanged water, 0.3 parts of tertiary dodecyl mercaptan as a chain transfer agent, and 0.5 parts of potassium persulfate as a polymerization initiator. After stirring, it was heated to 75°C to initiate polymerization. When the polymerization conversion rate reached 96%, cooling was performed to stop the reaction, and an aqueous dispersion of the particulate polymer 2 for negative electrodes was obtained. The minimum film forming temperature of the particulate polymer 2 was 40°C, the glass transition temperature (Tg) was 40°C, and the primary particle diameter was 135 nm.

[0152] (drying and crushing of granular polymers)

[0153] Moisture was r...

Embodiment 3

[0156] (Manufacture of Particulate Polymer 3 for Negative Electrodes)

[0157] Add 85 parts of styrene, 12 parts of 1,3-butadiene, 3 parts of itaconic acid, alkyl diphenyl ether disulfonate (DOWFAX (registered trademark) 2A1, manufactured by DOW Chemical Company) 0.4 parts in terms of solid content equivalents, 150 parts of ion-exchanged water, 0.3 parts of tertiary dodecyl mercaptan as a chain transfer agent, and 0.5 parts of potassium persulfate as a polymerization initiator. After stirring, it was heated to 75°C to initiate polymerization. When the polymerization conversion ratio reached 96%, cooling was performed to stop the reaction, and an aqueous dispersion of the particulate polymer 3 for negative electrodes was obtained. The minimum film forming temperature of the negative electrode particulate polymer 3 was 88°C, the glass transition temperature (Tg) was 70°C, and the primary particle diameter was 134 nm.

[0158] (drying and crushing of granular polymers)

[0159...

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Abstract

The purpose of the present invention is to provide a binder for use in electrochemical device electrodes which, by virtue not producing a slurry during electrode layer formation, has excellent productivity of electrodes and which, by virtue of not requiring a water-soluble polymer component as a dispersant, enables lower resistance and has excellent flexibility and accuracy of thickness of the obtained electrode; and also to provide an electrode composite using said binder, an electrode, an electrochemical device, and an electrochemical device manufacturing method. The present invention relates to a binder for use in electrochemical device electrodes which comprises a polymer with a glass transition temperature of 35-80°C and a D50 average particle diameter of 80-1000nm based on volume of the primary particles, has a volatile component at 120°C of less than 1 wt%, and consists of powder-form composite particles.

Description

technical field [0001] The present invention relates to a binder for electrochemical element electrodes, a particle composite for electrochemical element electrodes, an electrochemical element electrode, an electrochemical element, and a method for producing an electrochemical element electrode. Background technique [0002] Electrochemical components such as lithium-ion secondary batteries, electric double-layer capacitors, and lithium-ion capacitors are small, lightweight, have high energy density, and can be repeatedly charged and discharged. The effective use of these characteristics has rapidly expanded their demand. Lithium-ion secondary batteries have been used in the mobile field such as mobile phones and notebook personal computers because of their high energy density. On the other hand, electric double layer capacitors have been used as small power sources for backup storage of personal computers and the like because they can be rapidly charged and discharged. In a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01G11/22H01M4/13H01M4/139H01M4/36
CPCH01G11/38H01G11/86H01M4/622H01M10/0525Y02E60/10Y02T10/70
Inventor 石井琢也
Owner ZEON CORP