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Positive electrode for secondary battery, method for producing positive electrode for secondary battery, and secondary battery

A manufacturing method and secondary battery technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte storage battery electrodes, etc., can solve the problems of softness and adhesion of the positive electrode composite material layer, and achieve excellent output characteristics, softness Excellent effect of sex and adhesiveness

Active Publication Date: 2020-04-07
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the positive electrode composite material layer whose density and thickness are increased, it is easy to become difficult to ensure the flexibility and adhesiveness of the positive electrode composite material layer.

Method used

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  • Positive electrode for secondary battery, method for producing positive electrode for secondary battery, and secondary battery
  • Positive electrode for secondary battery, method for producing positive electrode for secondary battery, and secondary battery

Examples

Experimental program
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preparation example Construction

[0116] -Method for producing polymer (B)-

[0117] The method for producing the polymer (B) is not particularly limited, and it can be produced, for example, by polymerizing a monomer composition containing the above-mentioned monomers to obtain a polymer, and optionally hydrogenating the obtained polymer.

[0118] Here, in the present invention, the content ratio of each monomer in the monomer composition can be determined based on the content ratio of each monomer unit and structural unit (repeating unit) in the polymer (B).

[0119] The polymerization method is not particularly limited, and any method such as solution polymerization, suspension polymerization, bulk polymerization, or emulsion polymerization can be used. In addition, as the polymerization reaction, any reaction among ionic polymerization, radical polymerization, living radical polymerization and the like can be used. Furthermore, at the time of polymerization, known emulsifiers and polymerization initiators...

Embodiment 1

[0200]

[0201] Polyvinylidene fluoride (manufactured by Kureha Corporation, KF Polymer #7200, melting point: 161° C.) was prepared as the polymer (A).

[0202]

[0203] 240 parts of ion-exchanged water, 2.5 parts of sodium alkylbenzenesulfonate, 20 parts of acrylonitrile as a nitrile group-containing monomer, 30 parts of butyl acrylate as a (meth)acrylate monomer, 5 parts 45 parts of methacrylic acid as a monomer containing a hydrophilic group are charged into a high-pressure reactor with a stirrer in this order, and after the bottle is replaced with nitrogen, 45 parts of methacrylic acid as a conjugated diene monomer Add 0.25 parts of ammonium persulfate to the 1,3-butadiene, and make it polymerize at a reaction temperature of 40°C. Then, a polymer comprising a nitrile group-containing monomer unit, a (meth)acrylate monomer unit, a hydrophilic group-containing monomer unit, and a conjugated diene monomer unit is obtained. In addition, the polymerization conversion rate ...

Embodiment 2

[0220] A copolymer of vinylidene fluoride and hexafluoropropylene (manufactured by Arkema, Kynar flex 2850-00, content ratio of vinylidene fluoride unit: 97% by mass, melting point: 155° C.) was used as the polymer (A) instead of polyvinylidene fluoride. , except that, it carried out similarly to Example 1, the slurry composition for positive electrodes, the positive electrode for lithium ion secondary batteries, the negative electrode for lithium ion secondary batteries, and lithium ion secondary batteries were manufactured, and it evaluated. The results are shown in Table 1.

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Abstract

The present invention provides a positive electrode for a secondary battery that is excellent in flexibility and adhesiveness of the positive electrode composite material layer and that enables the secondary battery to exhibit excellent low-temperature output characteristics. The positive electrode for a secondary battery of the present invention has a current collector and a positive electrode composite material layer laminated on the current collector. The positive electrode composite material layer includes a positive electrode active material and a binding material, and the binding material contains 95% by mass or more of metafluoride In the polymer (A) of ethylene units and the polymer (B) containing a nitrile group-containing monomer unit, the crystallinity of the polymer (A) is 40% or less.

Description

technical field [0001] The present invention relates to a positive electrode for a secondary battery, a manufacturing method thereof, and a secondary battery. Background technique [0002] Secondary batteries such as lithium ion secondary batteries are small, lightweight, have high energy density, and can be repeatedly charged and discharged, and are used in a wide range of applications. Therefore, in recent years, with the aim of further improving the performance of secondary batteries, improvements in battery components such as electrodes have been studied. [0003] Here, an electrode for a secondary battery generally has a current collector and an electrode composite layer formed on the current collector. Furthermore, the electrode composite material layer contains, for example, an electrode active material, a binder (bonding material), a conductive material mixed as necessary, and the like. Therefore, in recent years, attempts have been made to improve the electrode co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/0566H01M4/02H01M4/04H01M10/052
CPCH01M4/13H01M4/139H01M4/131H01M4/133H01M4/623Y02E60/10H01M10/0525Y02P70/50
Inventor 杉本拓己
Owner ZEON CORP
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