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Binder for secondary battery electrode, secondary battery electrode, and secondary battery

A secondary battery and adhesive technology, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, active material electrodes, etc., can solve the problems of hindering battery reaction, battery capacity, cycle characteristics and speed characteristics, and achieve heat reduction , internal resistance reduction, and the effect of improving adhesion persistence

Active Publication Date: 2010-02-17
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, binders have been known in the past as follows: if the binder covers the active material and covers the surface, it will hinder the battery reaction, resulting in a decrease in the capacity, cycle characteristics and speed characteristics of the battery

Method used

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  • Binder for secondary battery electrode, secondary battery electrode, and secondary battery
  • Binder for secondary battery electrode, secondary battery electrode, and secondary battery
  • Binder for secondary battery electrode, secondary battery electrode, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] 200 parts of toluene, 0.1 part of 2,2'-azobisisobutyronitrile, 40 parts of 2-(perfluorotetradecyl)ethyl acrylate (acrylic acid 2- (Pa-fulorotetrado desil) Echel), 60 parts of 2-ethylhexyl acrylate, nitrogen substitution was sufficiently carried out, and then heated at 80°C to start polymerization. After 5 hours, the reaction was terminated by cooling to obtain a toluene solution of the polymer. The weight average molecular weight of the above polymer was 120,000.

[0131] The above polymer solution was mixed with 3 times the weight of N-methylpyrrolidone, and the toluene was evaporated with an evaporator to obtain an N-methylpyrrolidone solution of the polymer. Using this polymer solution, an electrode paste and a battery were fabricated as described above. The evaluation results are shown in Table 1.

Embodiment 2

[0133] Use 10 parts of 2-(perfluorooctyl)ethyl acrylate instead of 2-(perfluorotetradecyl)ethyl acrylate, use 90 parts of butyl acrylate instead of 2-ethylhexyl acrylate, in addition to Polymerization was carried out under the same conditions as in Example 1 to obtain a toluene solution of the polymer. In addition, the weight average molecular weight of the said polymer was 200,000. Using the above polymer solution, the same experiment as in Example 1 was carried out. The results are shown in Table 1.

Embodiment 3

[0135] Use 10 parts of 2-(perfluorohexyl)ethyl acrylate instead of 2-(perfluorotetradecyl)ethyl acrylate, use 90 parts of 2-ethylhexyl acrylate instead of 60 parts of 2-ethylhexyl acrylate, except Otherwise, polymerization was carried out under the same conditions as in Example 1 to obtain a toluene solution of a polymer. In addition, the weight average molecular weight of the obtained polymer was 200,000. Using the polymer solution, the same experiment as in Example 1 was performed. The results are shown in Table 1.

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Abstract

The present invention aims to improve bond durability as well as rate characteristics, cycle characteristics and short-circuit ratio of a secondary battery by decreasing the internal resistance of a secondary battery electrode. Specifically disclosed is a binder for secondary battery electrodes, which is composed of a polymer obtained by polymerizing a monomer composition containing a fluorine atom-containing monomer represented by the general formula (I) below and having a weight average molecular weight of 5,000-2,500,000. In the formula, R<1> represents a hydrogenor a methyl group, and R<2> represents a fluorine atom-containing hydrocarbon group having 6-18 carbon atoms.

Description

technical field [0001] The present invention relates to binders for secondary batteries such as lithium-ion secondary batteries and nickel-hydrogen secondary batteries, binder compositions for secondary battery electrodes using the same, slurry for secondary battery electrodes, secondary battery Electrodes for batteries and secondary batteries. Background technique [0002] Usually, the binder for battery electrodes (hereinafter sometimes simply referred to as binder) is dissolved in a solvent or dispersed in a dispersion medium to form a binder composition, and then the active material is mixed with the binder composition. And the obtained battery electrode slurry (hereinafter sometimes referred to as slurry) is coated on the current collector, and the solvent or dispersion medium is removed by drying or other methods, so that the active material and the current collector and the active material are mutually Adhesion, thereby making the electrode of the battery. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/02H01M4/13H01M4/139
CPCY02E60/122C09D133/16C08F220/18H01M4/621H01M4/13H01M4/623Y02E60/10C08F220/1804C08F220/1808C08F220/24H01M4/62
Inventor 福峰真弓胁坂康寻
Owner ZEON CORP
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