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Slurry composition for negative electrode of lithium ion secondary cell, negative electrode of lithium ion secondary cell, and lithium ion secondary cell

A secondary battery, lithium ion technology, used in secondary batteries, battery electrodes, lithium batteries, etc., can solve the problems of poor battery characteristics such as cycle characteristics and output characteristics, detachment of negative active materials, and volume expansion, etc. Good compatibility, good doping, and the effect of suppressing powder falling

Active Publication Date: 2013-12-04
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the alloy-type active material is doped or dedoped with lithium ions, its volume will expand and shrink.
As a result, the negative electrode active material is detached from the electrode (powder falling), which may degrade battery characteristics such as cycle characteristics and output characteristics.

Method used

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  • Slurry composition for negative electrode of lithium ion secondary cell, negative electrode of lithium ion secondary cell, and lithium ion secondary cell
  • Slurry composition for negative electrode of lithium ion secondary cell, negative electrode of lithium ion secondary cell, and lithium ion secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0194] (Manufacture of water-dispersible adhesives)

[0195] 40 parts of ion-exchanged water, 0.25 parts of sodium dodecyl diphenyl ether disulfonate, 0.4 parts of tert-dodecyl mercaptan (TDM), 0.6 parts of ammonium persulfate, 55.5 parts of styrene, 1,3- Add 40 parts of butadiene, 4 parts of itaconic acid, and 0.5 part of acrylamide-2-methylpropanesulfonic acid into a pressure-resistant container equipped with a stirrer, and stir to obtain an emulsion of the monomer mixture. Next, 100 parts of ion-exchanged water and 0.25 parts of sodium dodecyl diphenyl ether disulfonate were added to a pressure-resistant polymerization vessel with a stirrer and stirred, the resulting mixture was heated to 75°C, and ion-exchanged After 10 parts of water and 0.6 parts of ammonium persulfate, the emulsion of the above monomer mixture was continuously added to this mixture over 240 minutes. After the addition of the emulsion of the above-mentioned monomer mixture is completed, the temperature ...

Embodiment 2

[0206] Except having used the following water-dispersible binder, the slurry composition for lithium ion secondary battery negative electrodes was obtained similarly to Example 1, and the lithium ion secondary battery was produced. Each evaluation result is shown in Table 1. Moreover, content of the sulfonic acid ion originating in the polymerization initiator in this slurry composition was 1.2 mass parts with respect to the total of 100 mass parts of monomers which comprise a water-dispersible adhesive. In addition, the total amount of free ions in this slurry composition was 14500 ppm with respect to 100% by mass of the slurry composition.

[0207] (Manufacture of water-dispersible adhesives)

[0208] 40 parts of ion-exchanged water, 0.25 parts of sodium dodecyl diphenyl ether disulfonate, 0.4 parts of tert-dodecyl mercaptan (TDM), 0.6 parts of ammonium persulfate, 56.9 parts of styrene, 1,3- 40 parts of butadiene, 2.6 parts of itaconic acid, and 0.5 parts of acrylamide-2-...

Embodiment 3

[0210] Except having used the following water-dispersible binder, the slurry composition for lithium ion secondary battery negative electrodes was obtained similarly to Example 1, and the lithium ion secondary battery was produced. Each evaluation result is shown in Table 1. Moreover, content of the sulfonate ion originating in the polymerization initiator in this slurry composition was 1.2 mass parts with respect to the total of 100 mass parts of monomers which comprise a water-dispersible adhesive. In addition, the total amount of free ions in this slurry composition was 18600 ppm with respect to 100% by mass of the slurry composition.

[0211] (Manufacture of water-dispersible adhesives)

[0212] 40 parts of ion-exchanged water, 0.25 parts of sodium dodecyl diphenyl ether disulfonate, 0.4 parts of tert-dodecyl mercaptan (TDM), 0.6 parts of ammonium persulfate, 52.5 parts of styrene, 1,3- Add 40 parts of butadiene, 7 parts of itaconic acid, and 0.5 parts of acrylamide-2-me...

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Abstract

[Problem] To provide a slurry composition for a negative electrode of a lithium ion secondary cell, whereby a secondary cell having excellent cycle characteristics and output characteristics can be obtained, and whereby an electrode having excellent adhesion can be obtained. [Solution] This slurry composition for a negative electrode of a lithium ion secondary cell comprises a negative electrode active material, an aqueous dispersion binder, and water, and is characterized in that the specific surface area of the negative electrode active material is 3.0-20.0 m2 / g, the aqueous dispersion binder is a polymer that contains dicarboxylic acid-containing monomer units and sulfonic acid-containing monomer units, the content ratio of dicarboxylic acid-containing monomer units in the polymer is 2-10% by mass, the content ratio of sulfonic acid-containing monomer units is 0.1-1.5% by mass, and the potassium ion content in the slurry composition is no more than 1000 ppm with respect to 100% by mass of the slurry composition.

Description

technical field [0001] The invention relates to a slurry composition for a negative electrode of a lithium ion secondary battery, a negative electrode of a lithium ion secondary battery and a lithium ion secondary battery. 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. More comfortable portability is required for portable terminals, and miniaturization, thinning, weight reduction, and high performance are rapidly advancing. As a result, portable terminals are used in various places. In addition, similarly to portable terminals, miniaturization, thinning, weight reduction, and high performance are required for batteries. [0003] Currently, lithium-ion secondary b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/36H01M4/38H01M4/583H01M4/62H01M10/052H01M10/0566
CPCY02E60/122H01M4/583H01M4/13H01M4/139H01M4/36H01M10/052H01M4/62H01M4/38H01M10/0566H01M4/0404H01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M4/386H01M4/387H01M4/485H01M4/587H01M4/622H01M4/625H01M4/661H01M2004/021H01M2220/30Y02E60/10H01M4/364
Inventor 小林佳荒井健次
Owner ZEON CORP
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