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Binder composition, electrode mixture, electrode, and non-aqueous electrolyte secondary battery

A technology of composition and adhesive, applied in the direction of non-aqueous electrolyte battery, non-aqueous electrolyte battery electrode, non-aqueous electrolyte, etc., can solve the problem of weak adhesion of metal foil and achieve the effect of improving dispersibility

Active Publication Date: 2018-12-21
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PVDF has a problem of weak adhesion to the metal foil that is the current collector of the battery

Method used

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  • Binder composition, electrode mixture, electrode, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] [Preparation of Adhesive Composition]

[0103] In an autoclave with an inner capacity of 2 liters, 930 g of ion-exchanged water as a dispersion medium, 0.2 g of Metolose SM-100 (manufactured by Shin-Etsu Chemical Co., Ltd.) as a cellulose-based suspending agent, and 50 wt. 3.2 g of tert-diisopropyl peroxydicarbonate-Freon 225cb solution, 400 g of vinylidene fluoride, and 0.2 g of acrylic acid as a monomer were heated to 26° C. over 1 hour. Next, while maintaining 26 degreeC, 98 g of 2 wt% acrylic acid aqueous solutions were added over 9 hours. The polymerization was terminated when 25.7 hours had elapsed from the temperature rise.

[0104] After the polymerization was completed, the polymer slurry was heat-treated at 95°C for 60 minutes, dehydrated, washed with water, and dried at 80°C for 20 hours, thereby obtaining an adhesive composition (vinylidene fluoride copolymer) combination). The yield of the polymkeric substance obtained is 96%, inherent viscosity η i 3.0...

Embodiment 2

[0111] [Preparation of Adhesive Composition]

[0112] In an autoclave with an inner capacity of 2 liters, 900 g of ion-exchanged water as a dispersion medium, 0.4 g of Metolose 90SH-100 (manufactured by Shin-Etsu Chemical Co., Ltd.) as a cellulose-based suspending agent, and 50 wt. 3.0 g of tert-butyl peroxypivalate-freon 225cb solution, 400 g of vinylidene fluoride, and 0.2 g of acrylic acid as a monomer were heated up to 50° C. over 2 hours. Next, while maintaining 50° C., a 0.3 wt % acrylic acid aqueous solution was slowly added at a constant rate of polymerization pressure. Acrylic acid was added in a total amount of 2.0 g including the initially added amount. Simultaneously with the completion of the addition of the aqueous acrylic acid solution, the polymerization was stopped. The total time from the start of temperature rise to the stop of polymerization was 9.8 hours.

[0113] After completion of the polymerization, the polymer slurry was heat-treated at 95° C. for ...

Embodiment 3

[0119] [Preparation of Adhesive Composition]

[0120]In an autoclave with an inner capacity of 2 liters, 900 g of ion-exchanged water as a dispersion medium, 0.4 g of Metolose 90SH-100 (manufactured by Shin-Etsu Chemical Co., Ltd.) as a cellulose-based suspending agent, and 50 wt. 4.0 g of tert-butyl peroxypivalate-freon 225cb solution, 400 g of vinylidene fluoride, and 0.2 g of acrylic acid as a monomer were heated up to 50° C. over 2 hours. Next, while maintaining 50° C., a 0.3 wt % acrylic acid aqueous solution was slowly added at a constant rate of polymerization pressure. Acrylic acid was added in a total amount of 2.0 g including the initially added amount. Simultaneously with the completion of the addition of the aqueous acrylic acid solution, the polymerization was stopped. The total time from the start of temperature rise to the stop of polymerization was 9.4 hours.

[0121] After completion of the polymerization, the polymer slurry was heat-treated at 95° C. for 6...

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Abstract

Provided is a binder composition that has substantial adhesiveness and that achieves excellent conductive auxiliary dispersion. This binder composition includes a vinylidene fluoride copolymer composition that includes: vinylidene fluoride; and acrylic monomers. The acrylic monomers are acrylates and / or methacrylates. The ratio (Mn2 / Mn1) of the number average molecular weight (Mn2) of the vinylidene fluoride copolymer composition after being adsorbed onto alumina to the number average molecular weight (Mn1) of the vinylidene fluoride copolymer composition before being adsorbed onto alumina isless than 2.

Description

technical field [0001] The present invention relates to a binder composition, an electrode mixture, an electrode, and a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, the development of electronic technology has been astounding, and the high functionality of small portable devices has been promoted. Therefore, miniaturization and weight reduction, ie, higher energy density, are required for power supplies used for these. As batteries having high energy density, nonaqueous electrolyte secondary batteries typified by lithium ion secondary batteries and the like are widely used. [0003] In addition, from the viewpoint of global environmental problems and energy saving, non-aqueous electrolyte secondary batteries are also used in hybrid vehicles that combine secondary batteries and engines, and electric vehicles that use secondary batteries as power sources. expand. [0004] An electrode for a nonaqueous electrolyte secondary battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/525H01M4/623H01M4/624H01M10/0525Y02E60/10H01M4/13H01M10/052H01M2300/0025C09J7/385C08F214/22C08L27/16H01M4/667H01M10/0565
Inventor 堺勇树镰田慎太郎菅原绘美
Owner KUREHA KAGAKU KOGYO KK
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