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Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, slurry for forming protective film, protective film, and electricity storage device

A technology for electrical storage devices and compositions, applied in non-aqueous electrolyte battery electrodes, battery electrodes, hybrid capacitor electrodes, etc., can solve the problems of damage to oxidation resistance of organic polymers, deterioration of charge and discharge characteristics, etc., and achieve discharge rate characteristics. Good effect, excellent liquid retention, and excellent adhesion

Active Publication Date: 2014-07-23
株式会社引能仕材料
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, according to the technique described in Japanese Patent Application Laid-Open No. 2011-3529, which uses a fluorine-containing organic polymer and a rubber-based polymer in combination, although the adhesiveness is improved, the oxidation resistance of the organic polymer is greatly impaired. On the other hand, there is a problem in the manufactured electric storage device that the charging and discharging characteristics are irreversibly deteriorated due to repeated charging and discharging.

Method used

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  • Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, slurry for forming protective film, protective film, and electricity storage device
  • Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, slurry for forming protective film, protective film, and electricity storage device
  • Binder composition for electricity storage devices, slurry for electricity storage device electrodes, electricity storage device electrode, slurry for forming protective film, protective film, and electricity storage device

Examples

Experimental program
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Effect test

preparation example Construction

[0179] In preparation of the slurry for electrical storage device electrodes (mixing operation of each component), it is preferable to perform at least a part of the process under reduced pressure. Thereby, generation of air bubbles in the obtained electrode layer can be prevented. As the degree of decompression, as an absolute pressure, it is preferably set to 5.0×10 3 ~5.0×10 5 Pa or so.

[0180] As mixing and stirring for producing the slurry for electrical storage device electrodes, it is necessary to select a mixer capable of stirring to such an extent that no aggregates of the active material remain in the slurry, and necessary and sufficient dispersion conditions. The degree of dispersion can be measured by a fineness meter, but it is preferable to mix and disperse in such a way as to eliminate at least aggregates larger than 100 μm. As a mixer suitable for such conditions, a ball mill, a sand mill, a pigment disperser, a crushing machine, an ultrasonic disperser, a ...

Embodiment 1

[0264] 7.1.1. Preparation of adhesive composition for electrical storage devices

[0265] The interior of an autoclave with an internal volume of about 6 L equipped with an electromagnetic stirrer is fully replaced with nitrogen, then 2.5 L of deoxidized pure water and 25 g of ammonium perfluorodecanoate as an emulsifier are added, and the temperature is raised while stirring at 350 rpm to 60°C. Next, a mixed gas containing 70% of vinylidene fluoride (VDF) and 30% of hexafluoropropylene (HFP) as monomers was fed until the internal pressure reached 20 kg / cm 2 . 25 g of a FLON-113 solution containing 20% ​​of diisopropylperoxydicarbonate as a polymerization initiator was pressurized using nitrogen gas to initiate polymerization. During the polymerization, the internal pressure was maintained at 20kg / cm according to 2 Press the mixed gas containing VDF60.2% and HFP39.8% successively to maintain the pressure at 20kg / cm 2 . In addition, since the polymerization rate decreased ...

Embodiment 2

[0293] 7.2. Embodiment 2 and Comparative Example 3

[0294] 7.2.1. Preparation of adhesive composition for electrical storage devices

[0295] In the "7.1.1. Preparation of binder composition for electrical storage devices" of the above-mentioned Example 1, the composition of the monomer and the amount of emulsifier were appropriately changed, and the same operation was performed as in Example 1 to prepare the Aqueous dispersion of polymer particles having a composition of , and water was removed or added under reduced pressure according to the solid content concentration of the aqueous dispersion to obtain an aqueous dispersion with a solid content concentration of 40%. About the obtained polymer particle, it carried out similarly to Example 1, and performed the measurement of the number average particle diameter, the calculation result of the ratio of a major diameter and a minor diameter, and DSC measurement. The results are shown in Table 1 together.

[0296] 7.2.2. Prep...

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Abstract

This binder composition for electricity storage devices is characterized by containing: (A) particles of a polymer which contains a repeating unit (a) that is derived from a fluorine-containing compound and a repeating unit (b) that is derived from a polyfunctional (meth) acrylic acid ester; and (B) a liquid medium. This binder composition for electricity storage devices is also characterized in that one endothermic peak is observed within the temperature range from -30 DEG C to 30 DEG C and one endothermic peak is observed within the temperature range from 80 DEG C to 150 DEG C when differential scanning calorimetry (DSC) is carried out on the polymer particles (A) in accordance with JIS K7121.

Description

technical field [0001] The present invention relates to a binder composition for an electrical storage device, a slurry for an electrical storage device electrode containing the binder composition and an active material, an electrical storage device electrode formed by applying the slurry to a collector, and An electrical storage device including the electrode, a slurry for forming a protective film containing the binder composition and inorganic particles, a protective film formed from the slurry, and an electrical storage device including the protective film. Background technique [0002] In recent years, the development of electric storage devices having high voltage and high energy density has been demanded as a power source for driving electronic devices. In particular, lithium-ion batteries and lithium-ion capacitors are expected to be electric storage devices with high voltage and high energy density. [0003] An electrical storage device electrode used in such an el...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01G11/22H01M2/16H01M4/13H01M4/139
CPCH01G11/38H01G11/46H01G11/50H01M4/13H01M4/139H01M4/622H01M50/46Y02T10/70Y02E60/10H01M50/449H01M10/052C01P2004/64C01P2004/62
Inventor 北口博纪大塚巧治藤原伸行
Owner 株式会社引能仕材料
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