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Binder composition for electrode

A composition and adhesive technology, applied in electrode manufacturing, battery electrodes, electrode current collector coating, etc., can solve problems such as adverse environmental impact, peeling of electrode active material layer, easy self-discharge, etc.

Active Publication Date: 2015-05-13
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

However, it has been pointed out that if the conventionally known adhesive composition is applied to the vehicle mounting application, various problems will arise due to the use temperature.
For example, although an electrochemical device made of the binder disclosed in Japanese Patent Application Laid-Open No. 10-302799 has high oxidation resistance capable of withstanding positive electrode reactions, it cannot maintain the adhesion between electrode active materials in a high-temperature environment. and the adhesion between the electrode active material layer and the current collector, there is a problem that the electrode active material layer is easily peeled off from the current collector
The electrochemical device made using the binder of the above-mentioned International Publication No. 02 / 039518 pamphlet not only has the problem of easy self-discharge in a high-temperature environment, but also has concerns about environmental impact because it contains an organic solvent as a liquid medium that meets the above requirements. Cause adverse effects, and there are also safety issues when the operator operates

Method used

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  • Binder composition for electrode
  • Binder composition for electrode
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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0159] The preparation of the electrode slurry is preferably performed under reduced pressure, thereby preventing generation of air bubbles in the obtained electrode active material layer.

[0160] The above-mentioned slurry for electrodes contains the binder composition for electrodes of the present invention, so it can form an electrode active material layer with high adhesion between electrode active materials and between electrode active materials and current collectors, and can provide An electrochemical device with excellent electrochemical stability in a high-temperature environment.

[0161]

[0162] Electrodes of the present invention include:

[0163] current collector,

[0164] An electrode active material layer formed through the steps of applying the above-described electrode slurry on the surface of the current collector and drying it.

[0165] After drying of the coating film, it is preferable to perform press processing.

[0166] [collector]

[0167] As t...

Embodiment

[0202] Hereinafter, the present invention will be described more specifically by way of examples and comparative examples, but the present invention is not limited to these examples and comparative examples.

[0203] Below, when "parts" and "%" are simply described, unless otherwise specified, they are the mass standards, respectively.

[0204] Measurement methods and evaluation methods of various characteristic values ​​common to all Examples and Comparative Examples are as follows.

[0205]

[0206] (1) Hydrodynamic diameter

[0207] Each electrode binder composition was diluted about 1000 times with water as a measurement sample, and as a measurement device, a He Ne laser (λ=632.8nm) with an output power of 22mW was used as a light source made by ALV GmbH. The measurement was performed with a modified dynamic light scattering measuring device "ALV5000", and the measured number average particle diameter was used as the hydrodynamic diameter.

[0208] (2) Content ratio of...

Synthetic example 1

[0219] After fully nitrogen-substituting the inside of an autoclave with an internal volume of about 6 liters equipped with an electromagnetic stirrer, 2.5 liters of deoxygenated pure water and 25 g of ammonium perfluorodecanoate as an emulsifier were added to the above-mentioned autoclave. While stirring, the temperature was raised to 60°C. Next, supply vinylidene fluoride (VDF) gas into the autoclave until the inner pressure of the autoclave reaches 20 kg / cm 2 g. Then, using nitrogen as a carrier gas, 25 g of a Flon 113 solution containing 20% ​​of diisopropyl peroxydicarbonate as a polymerization initiator was pressurized to initiate polymerization. During the polymerization process, VDF gas was gradually supplied to the above-mentioned autoclave to maintain the internal pressure at 20kg / cm 2 g. Here, since the polymerization rate slows down as the polymerization proceeds, 3 hours after the initiation of the polymerization, nitrogen gas was used as a carrier gas, and the...

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Abstract

A binder composition for electrodes, comprising a polymer and an aqueous medium, wherein the polymer consists of a polymer (A) which has a HOMO value calculated by a semiempirical molecular orbital method of -10 eV or less, a difference between its LUMO value calculated by the semiempirical molecular orbital method and its HOMO value of 10.5 eV or more and a fluorine atom content measured by combustion ion chromatography of 2 to 30 mass%. An electrochemical device obtained from the above binder composition for electrodes of the present invention can retain adhesion even in a high-temperature environment and its self-discharge in a high-temperature environment is highly suppressed.

Description

technical field [0001] The invention relates to a binder composition for electrodes. Background technique [0002] In recent years, progress in miniaturization and weight reduction of electronic devices has attracted attention. Along with this, there are increasing demands for miniaturization and higher energy density of electrochemical devices (for example, secondary batteries, capacitors, etc.) used as power sources for driving electronic devices. As electrochemical devices satisfying this requirement, nickel-hydrogen secondary batteries, lithium-ion secondary batteries, and the like have recently been developed. [0003] Research aimed at improving the characteristics of electrochemical devices is not limited to the development of devices with new structures, but is also being carried out on components that constitute existing devices. For example, improvements in electrodes used in many electrochemical devices have been made. [0004] As electrodes used in secondary b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/139H01G11/38
CPCH01G11/38H01M4/0404H01M4/13H01M4/621H01M10/0525Y02E60/10Y02T10/70H01M4/62
Inventor 茂木武志本多达朗真坂房澄H-J. 李
Owner 株式会社引能仕材料
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