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Binder particles for electrochemical element

A technology for electrochemical components and adhesives, applied in electrical components, electrochemical generators, circuits, etc., can solve problems affecting the performance of electrochemical components, and achieve the effect of excellent dispersion stability

Inactive Publication Date: 2012-10-17
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These components all affect the characteristics of the electrochemical element, especially the high volume of the binder in the electrode composition, therefore, greatly affect the performance of the electrochemical element

Method used

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  • Binder particles for electrochemical element
  • Binder particles for electrochemical element
  • Binder particles for electrochemical element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0212] Charge 40 parts of methyl ethyl ketone into the reactor and raise the temperature to 120°C under nitrogen atmosphere, 3.0 parts of p-azobisisobutyronitrile, 60 parts of dimethylaminoethyl methacrylate, 70 parts of butyl acrylate, 20 parts of methyl methacrylates were mixed, and the obtained mixed solution was added dropwise at a constant rate over 3 hours, and further reacted for 3 hours to prepare a polymer (I-1). Then the produced polymer (I-1) was cooled to 60° C., and 145 parts of nitrilotrimethylene phosphonic acid (relative to the mole of nitrogen atom in dimethylaminoethyl methacrylate) was added as a quaternizing agent The number is 1 mole) and 500 parts of ion-exchanged water to prepare a quaternized polymer (II-1). The weight average molecular weight of the quaternized polymer (II-1) was 25,000. In addition, the content of the monomer (dimethylaminoethyl methacrylate) unit containing an atom having a lone electron pair in the quaternized polymer (II-1) was 40...

Embodiment 2

[0223] As the negative electrode active material, lithium titanate (Li 4 Ti 5 o 12 ) instead of artificial graphite, except that, the same operation as in Example 1 was performed to prepare and evaluate an emulsion of binder particles with a core-shell structure, a slurry for electrodes, an electrode, and a coin-shaped lithium ion secondary battery. The results are shown in Table 1 and Table 2.

Embodiment 3

[0225] The temperature of the quaternized polymer (II-1) obtained in Example 1 was raised to 50°C, and a mixture of 80 parts of butadiene, 40 parts of styrene and 30 parts of acrylonitrile, 0.3 parts of potassium persulfate and ion-exchanged water 50 parts were added dropwise at a constant speed for 4 hours at the same time, and then allowed to react for 6 hours to obtain the quaternized polymer (II-1) as the shell portion and the styrene / butadiene / acrylonitrile copolymer ( Elastomeric polymer) as a dispersion of core-shell adhesive particles at the core. The obtained dispersion was concentrated to obtain an emulsion of binder particles having a solid content concentration of 40%. Except having used this as a binder particle emulsion, the same operation as Example 1 was performed, the slurry for electrodes, an electrode, and a coin-type lithium ion secondary battery were produced and evaluated. The results are shown in Table 1 and Table 2.

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Abstract

Disclosed is a binder for an electrochemical element, which does not contain any component that is decomposed at a voltage at which lithium is inserted into a negative electrode active material, and has excellent output properties ad life properties without being increased in internal resistance. Specifically disclosed are binder particles for an electrochemical element, each of which is composed of a core part and a shell part, and is characterized in that the shell part comprises a polymer that contains a monomer unit containing an atom having a lone pair wherein the atom is converted into the form of a quaternary cation with an organic acid.

Description

technical field [0001] The invention relates to a binder particle, its emulsion, and a slurry composition for electrochemical element electrodes. The binder particle, its emulsion, and the slurry composition for electrochemical element electrodes are used for lithium ion secondary In the manufacture of electrodes used in electrochemical devices such as batteries and electric double layer capacitors (hereinafter, may be collectively referred to as "electrode for electrochemical devices"). Background technique [0002] The demand for electrochemical elements such as lithium-ion secondary batteries, electric double layer capacitors, and lithium-ion capacitors, which take advantage of the characteristics of small size, light weight, high energy density, and repeatable charge and discharge, is rapidly expanding. Lithium-ion secondary batteries have high energy density, so they are used in fields such as mobile phones and notebook personal computers. In addition, electric double ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C08J3/12H01G9/058H01G11/38
CPCH01M4/133H01M4/621Y02E60/122Y02E60/13H01G11/38H01M10/0525H01M4/139H01G9/058C08L2207/53Y02E60/10C08J3/12H01M4/62
Inventor 胁坂康寻小林佳
Owner ZEON CORP
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