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Binder aqueous solution for lithium ion battery, slurry for lithium ion battery negative electrode, negative electrode for lithium ion battery, and lithium ion battery

A lithium ion battery and adhesive technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve the problems of easy reduction, expansion and shrinkage of electrical characteristics such as cycle characteristics of lithium ion batteries, and achieve excellent storage. Effects of stability, excellent flexibility and adhesion, and excellent discharge capacity retention

Pending Publication Date: 2021-03-19
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, depending on the electrode active material, expansion and contraction easily occur with charge and discharge
Therefore, the electrode for lithium ion batteries, which tends to expand and contract with charge and discharge, changes in volume (resilience) compared with the initial stage due to repeated charge and discharge, and the electrical characteristics such as cycle characteristics of lithium ion batteries using this electrode for lithium ion batteries easy to lower

Method used

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  • Binder aqueous solution for lithium ion battery, slurry for lithium ion battery negative electrode, negative electrode for lithium ion battery, and lithium ion battery
  • Binder aqueous solution for lithium ion battery, slurry for lithium ion battery negative electrode, negative electrode for lithium ion battery, and lithium ion battery
  • Binder aqueous solution for lithium ion battery, slurry for lithium ion battery negative electrode, negative electrode for lithium ion battery, and lithium ion battery

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Embodiment

[0220] Hereinafter, the present invention will be specifically described by way of examples and comparative examples. However, the description of the above-mentioned preferred embodiments and the following examples are provided for the purpose of illustration only, and are not provided for the purpose of limiting the present invention. Therefore, the scope of the present invention is not limited to the embodiments or examples specifically described in this specification, but is limited only by the scope of the claims. In addition, in each Example and a comparative example, unless otherwise indicated, numerical values, such as a part and %, are based on mass.

[0221] (A) Manufacture of ingredients

manufacture example 1

[0223] Add 1240g of ion-exchanged water, 350g (2.46mol) of 50% acrylamide aqueous solution, 56.6g (0.43mol) of 2-methoxyethyl acrylate, 0.23 g (0.0014 mol) of sodium methallyl sulfonate (Natrium Natrium) was removed from the reaction system by nitrogen gas, and then the temperature was raised to 55°C. 2.1 g of 2,2'-azobis-2-amidinopropane dihydrochloride (2,2'-Azobis-2-Amijinopropane dihydrochloride) (manufactured by Nippon Chemical Co., Ltd., product name "NC-32"), 20g of ion-exchanged water, heated up to 80°C for 3 hours of reaction. Ion-exchanged water was added so that the solid content concentration became 13%, and an aqueous binder solution containing a water-soluble poly(meth)acrylamide was obtained. The B-type viscosity of this solution at 25°C was 10,000 mPa·s.

[0224] In manufacture example 2 - manufacture example 4, except having changed the monomer composition as shown in the following table, it carried out similarly to manufacture example 1, and prepared the bi...

manufacture example 5

[0226] Add 1170g of ion-exchanged water, 120g (0.84mol) of 50% acrylamide aqueous solution, 12g (0.12mol) of N,N-dimethylacrylamide, 62.8 g (0.48mol) 2-methoxyethyl acrylate, 87g (0.96mol) 80% acrylic acid, 0.19g (0.0012mol) sodium methallyl sulfonate, after removing the oxygen in the reaction system by nitrogen, the temperature was raised to 55°C. 1.8 g of 2,2'-azobis-2-amidinopropane dihydrochloride (manufactured by Nippon Chemical Co., Ltd., product name "NC-32") and 20 g of ion-exchanged water were put thereinto, and the temperature was raised to 80° C. The reaction was carried out for 3 hours. Then, 64.4 g (0.77 mol) of 48% sodium hydroxide aqueous solution was added as a neutralizing agent and stirred, and ion-exchanged water was added so that the solid content concentration was 13%, and an adhesive containing water-soluble poly(meth)acrylamide was obtained. agent aqueous solution. The B-type viscosity of this solution at 25°C was 12,000 mPa·s.

[0227] In Production...

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Abstract

To provide an aqueous binder solution for lithium ion battery electrodes, a slurry for lithium ion battery negative electrodes, a negative electrode for lithium ion batteries, and a lithium ion battery. The present disclosure provides an aqueous binder solution for a lithium ion battery, which contains a water-soluble poly (meth) acrylamide (A) that is a polymer of a monomer group, and the monomergroup comprises, relative to 100 mol% of the monomer group, 30-95 mol% of a compound (a) containing a (meth) acrylamide group and 5-40 mol% of an alkoxyalkyl (meth) acrylate (b) represented by general formula (1), CH2=C(R1)-CO-O-O-R2-O-O-R3(1), in the formula, R1 represents a hydrogen atom or a methyl group, R2 represents an alkylene group having 1-4 carbon atoms, and R3 represents an alkyl grouphaving 1-4 carbon atoms. In addition, the total number of carbon atoms in the groups of R1, R2, and R3 is 5 or less.

Description

technical field [0001] The disclosure relates to an aqueous binder solution for a lithium ion battery, a slurry for a negative electrode of a lithium ion battery, a negative electrode for a lithium ion battery, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of small size, light weight, high energy density, and can be repeatedly charged and discharged, and have been used in a wide range of applications. Therefore, in recent years, for the purpose of further enhancing the performance of lithium-ion batteries, improvements in battery components such as electrodes have been studied. [0003] Both the positive electrode and the negative electrode of the lithium ion battery are manufactured by the following method: the slurry formed by dispersing the electrode active material and the binder resin in a solvent is coated on both sides of the current collector (such as a metal foil), and the solvent is dried. After removing th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/622H01M4/13H01M10/0525Y02E60/10H01M10/052H01M2004/027H01M4/0416H01M2004/021
Inventor 池谷克彦尾崎真仁合田英生
Owner ARAKAWA CHEM IND LTD