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Positive electrode for secondary cell, method for manufacturing positive electrode secondary cell, and secondary cell

A secondary battery and manufacturing method 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: 2017-02-22
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 cell, method for manufacturing positive electrode secondary cell, and secondary cell
  • Positive electrode for secondary cell, method for manufacturing positive electrode secondary cell, and secondary cell

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 of solution polymerization, suspension polymerization, bulk polymerization, emulsion polymerization, and the like can be used. In addition, as the polymerization reaction, any of ionic polymerization, radical polymerization, living radical polymerization, and the like can be used. Moreover, at the time of polymerization, a known emulsifier and a polymerization initiator can be used ...

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 including 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 w...

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 cell in which a positive electrode mixture layer exhibits excellent flexibility and binding characteristics and excellent low-temperature output characteristics. This positive electrode for a secondary cell is provided with a collector and a positive electrode mixture layer laminated on the collector, the positive electrode mixture layer containing a positive electrode active material and a binder, the binder containing a polymer (A) containing at least 95% by mass of vinylidene fluoride units and a polymer (B) containing nitrile-group-containing monomer units, and the polymer (A) having a crystallinity of 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 in size, light in weight, high in 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 members such as electrodes have been studied. [0003] Here, an electrode for a secondary battery generally has a current collector and an electrode composite material 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 ...

Claims

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Application Information

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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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