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Composition for electrode binder, composition for electrode, electrode and electrochemical device

A technology of adhesive and composition, which is applied in the direction of battery electrodes, electrolytic capacitors, hybrid capacitor electrodes, etc., can solve the problems of equipment performance reliability reduction, pressure processing machine pollution, electrode layer peeling, etc., and achieve the effect of high adhesion

Inactive Publication Date: 2012-10-31
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when an electrode layer with a small binder component is subjected to press processing, the electrode layer is easily peeled off from the current collector.
Therefore, it is reported that there is not only contamination of the press machine due to the electrode substance, but also the electrode is installed in the electrochemical device in a state where a part of the electrode layer is peeled off, and the reliability of the device performance is reduced.
[0007] However, in the case of using an electrode binder composition with a polymer having a high glass transition temperature, there is a problem that the obtained electrode layer has low flexibility and cracks are likely to occur.

Method used

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  • Composition for electrode binder, composition for electrode, electrode and electrochemical device
  • Composition for electrode binder, composition for electrode, electrode and electrochemical device
  • Composition for electrode binder, composition for electrode, electrode and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0129] (3) Preparation of electrode composition

[0130] In the electrode composition, the solid content in the electrode binder composition, that is, the remaining component after removing the (B) component from the electrode binder composition, is preferably 0.1 to 10 parts by weight relative to 100 parts by weight of the electrode active material. It is contained in a ratio of parts by weight, more preferably 0.3 to 4 parts by weight. When the ratio of the solid content of the composition for electrode binders is too small, there exists a tendency for favorable adhesiveness not being acquired. On the other hand, when the ratio of the solid content of the composition for electrode binders is too large, the overvoltage tends to increase and affect battery characteristics.

[0131] In the preparation of the electrode composition, a mixer, defoamer, bead mill, high-pressure homogenizer, etc. can be used as means for mixing the electrode binder composition, electrode active mat...

Embodiment 1～2、 comparative example 1

[0152] (1) The emulsion polymerization process of the first stage:

[0153] 200 parts of water, 0.5 part of sodium dodecylbenzenesulfonate, 1.0 part of potassium persulfate, 0.5 part of sodium bisulfite, and the The molecular weight regulator and the monomer mixture (X) were subjected to emulsion polymerization at the temperature described in the table for 6 hours, and it was confirmed that the polymerization conversion rate was 70% or more.

[0154] (2) The emulsion polymerization process of the second stage:

[0155] Following the emulsion polymerization step of the first stage above, the molecular weight regulator and the monomer mixture (Y) shown in the following Table 1 were continuously added at the temperature described in the table over 3 hours to carry out emulsion polymerization.

[0156] (3) The emulsion polymerization process of the third stage:

[0157] Following the above-mentioned second-stage emulsion polymerization step, the molecular weight modifier and the...

Embodiment 3

[0161] (1) The emulsion polymerization process of the first stage:

[0162] 200 parts of water, 0.5 part of sodium dodecylbenzenesulfonate, 1.0 part of potassium persulfate, 0.5 part of sodium bisulfite, and the The molecular weight regulator and the monomer mixture (X) were subjected to emulsion polymerization at the temperature described in the table for 6 hours, and it was confirmed that the polymerization conversion rate was 70% or more.

[0163] (2) The emulsion polymerization process of the second stage:

[0164] After the first-stage emulsion polymerization step, the molecular weight modifier and the monomer mixture (Y) shown in Table 1 below were continuously added at the temperature described in the table for 6 hours to carry out emulsion polymerization to obtain a latex. The final polymerization addition rate was 99%.

[0165] It carried out similarly to Example 1, and prepared the composition for electrode binders whose solid content concentration was 49 mass %. ...

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Abstract

Disclosed are: a composition for an electrode binder, which is capable of providing an electrode layer that has high adhesion to a collector and thus is not separated from the collector during pressing, while being highly flexible; a composition for an electrode; an electrode which is obtained from the composition for an electrode; and an electrochemical device which comprises the electrode. Specifically disclosed is a composition for an electrode binder, which contains (A) a polymer that comprises (a) a repeating unit derived from an aliphatic conjugated diene monomer and (b) a repeating unit derived from an ethylenically unsaturated carboxylic acid monomer, while having at least one glass transition point within the range from -80 DEG C to 100 DEG C and a temperature range width of 20 DEG C or more wherein the temperature differential coefficient of the logarithm of storage modulus is from -0.09 to -0.02, and (B) a liquid medium.

Description

technical field [0001] The present invention relates to a composition for an electrochemical device electrode binder, a composition for an electrochemical device electrode, an electrochemical device electrode obtained from the composition for an electrochemical device electrode, and an electrochemical device having the electrochemical device electrode. The composition for electrode binders of electrochemical devices is used to obtain electrodes of electrochemical devices such as secondary batteries, electric double layer capacitors, and lithium ion capacitors. Background technique [0002] As a method for producing electrodes used in electrochemical devices such as lithium-ion secondary batteries and lithium-ion capacitors, it is known that a liquid composition containing a binder and an electrode active material is applied to the surface of a current collector to A method of drying to form an electrode layer on the current collector. [0003] As an electrode binder composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C08F2/22H01G9/058H01G11/38
CPCY02E60/12H01G11/38H01G9/058H01M4/622H01M10/052H01M4/621C08F2/22Y02E60/13C08F236/04C08F236/12Y02E60/10H01M4/62
Inventor 茂木武志本多达朗真坂房澄
Owner JSR CORPORATIOON
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