Slurry composition for lithium-ion secondary cell negative electrode

A secondary battery, lithium ion technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve the problems of inability to uniformly disperse, deterioration of battery characteristics such as cycle characteristics, and aggregation of alloy active materials, and achieve high-temperature cycling. Excellent properties, suppressing volume expansion, and improving dispersibility

Active Publication Date: 2015-02-04
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the slurry composition, the alloy-based active material tends to aggregate and cannot be uniformly dispersed, which may lead to deterioration of battery characteristics such as cycle characteristics

Method used

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  • Slurry composition for lithium-ion secondary cell negative electrode
  • Slurry composition for lithium-ion secondary cell negative electrode
  • Slurry composition for lithium-ion secondary cell negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0314] [1] Manufacture of water-soluble polymer (B1)

[0315] Add 25 parts of methacrylic acid (ethylenically unsaturated carboxylic acid monomer), 2,2,2-trifluoroethyl methacrylate (fluorine-containing (meth)acrylate monomer) into a 5MPa pressure-resistant container with a stirrer ) 10 parts, ethyl acrylate ((meth)acrylate monomer) 58.5 parts, 2-acrylamide-2-methylpropanesulfonic acid (ethylenically unsaturated sulfonic acid monomer) 5 parts, polyoxyalkylene Alkenyl ether ammonium sulfate (reactive surfactant monomer, manufactured by Kao, trade name "Latemul PD-104") 1.5 parts, tert-dodecyl mercaptan (chain transfer agent) 0.2 parts, ion-exchanged water 150 parts and 0.5 parts of potassium persulfate (polymerization initiator) were stirred sufficiently, and then heated to 50° C. to initiate polymerization. When the polymerization conversion ratio reached 99.0% or more, cooling was performed to terminate the reaction, and a mixture containing the water-dispersed polymer (B1...

Embodiment 2

[0337] In the manufacture of the slurry composition for negative electrodes in step [3], the addition amount of the water-soluble polymer (B1) was set to 0.3 parts, and the addition amount of the water-soluble polymer (B2) was set to 0.2 parts, and the Except for the slurry composition for negative electrodes, it carried out similarly to Example 1, and manufactured the negative electrode and the lithium ion secondary battery. The results are shown in Table 1.

Embodiment 3

[0339] In the manufacture of the slurry composition for negative electrodes in step [3], the addition amount of the water-soluble polymer (B1) was set to 1.08 parts, and the addition amount of the water-soluble polymer (B2) was set to 0.72 parts, and the Except for the slurry composition for negative electrodes, it carried out similarly to Example 1, and manufactured the negative electrode and the lithium ion secondary battery. The results are shown in Table 1.

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Abstract

[Problem] To provide a slurry composition for a lithium-ion secondary cell negative electrode making it possible to obtain a secondary cell having excellent cycling characteristics, and a negative electrode having excellent binding properties. [Solution] This slurry composition for a lithium-ion secondary cell negative electrode contains a negative-electrode active substance (A), a water-soluble polymer (B), and water (C), wherein the water-soluble polymer (B) contains a water-soluble polymer (B1) that is a polymer alkali metal salt containing an ethylenically unsaturated acid monomer unit and a fluorine-containing (meth)acrylate monomer unit, and a water-soluble polymer (B2) that is a polymer alkali metal salt containing at least 80 percent by mass of an ethylenically unsaturated acid monomer unit, the viscosity of a 5% aqueous solution of the water-soluble polymer (B1) being 100-1500 cp, and the viscosity of a 5% aqueous solution of the water-soluble polymer (B2) being 2000-20000 pc.

Description

technical field [0001] The invention relates to a slurry composition for negative electrodes of lithium ion secondary batteries. Background technique [0002] In recent years, portable terminals such as notebook computers, mobile phones, and PDAs (Personal Digital Assistants) have spread remarkably. As secondary batteries that can be used as power sources for these portable terminals, nickel-metal hydride secondary batteries, lithium-ion secondary batteries, and the like are often used. Since portable terminals are required to be more comfortable and portable, miniaturization, thinning, light weight, and high performance have been rapidly developed. As a result, portable terminals have been used in various situations. In addition, the battery is also required to be miniaturized, thinner, lighter, and higher in performance similarly to the portable terminal. [0003] Conventionally, lithium-ion secondary batteries can use carbon-based active materials such as graphite as ne...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/139H01M10/052H01M10/0566
CPCY02E60/122H01M10/052H01M4/13H01M2004/021H01M4/139H01M4/364H01M4/622Y02E60/10H01M10/0525
Inventor 足立祐辅佐佐木智一
Owner ZEON CORP
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