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Slurry for lithium ion secondary battery negative electrodes, electrode for lithium ion secondary batteries, method for producing electrode for lithium ion secondary batteries, and lithium ion secondary battery

A secondary battery, lithium ion technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problem of reduced cycle characteristics, and achieve the effect of excellent adhesion and excellent cycle characteristics

Active Publication Date: 2015-03-25
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, there is a possibility that the cycle characteristics in high-temperature environments may be degraded.

Method used

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  • Slurry for lithium ion secondary battery negative electrodes, electrode for lithium ion secondary batteries, method for producing electrode for lithium ion secondary batteries, and lithium ion secondary battery
  • Slurry for lithium ion secondary battery negative electrodes, electrode for lithium ion secondary batteries, method for producing electrode for lithium ion secondary batteries, and lithium ion secondary battery
  • Slurry for lithium ion secondary battery negative electrodes, electrode for lithium ion secondary batteries, method for producing electrode for lithium ion secondary batteries, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0268] (1-1. Production of Particulate Polymer)

[0269] Add 30 parts of 1,3-butadiene, 4 parts of itaconic acid as an ethylenically unsaturated carboxylic acid monomer, and 65 parts of styrene as an aromatic vinyl monomer in a 5MPa pressure-resistant container with a stirrer, as 1 part of 2-hydroxyethyl acrylate containing a hydroxyl monomer, 4 parts of sodium dodecylbenzenesulfonate as an emulsifier, 150 parts of ion-exchanged water, and 0.5 parts of potassium persulfate as a polymerization initiator, after fully stirring , heated to 50 ° C to initiate polymerization.

[0270] When the polymerization conversion ratio reached 96%, cooling was performed to terminate the reaction, and a mixture containing a particulate polymer (SBR) as a binder was obtained. A 5% sodium hydroxide aqueous solution was added to the above-mentioned mixture containing the particulate polymer to adjust pH to 8. Thereafter, unreacted monomers were removed by heating and vacuum distillation. Then, ...

Embodiment 2

[0290] In the above (manufacture of 1-1. particulate-form polymer), the quantity of 1, 3- butadiene was changed into 20 parts, and the quantity of styrene was changed into 75 parts.

[0291] In the above (1-3. Manufacture of negative electrode slurry), the amount of the 1% aqueous solution of carboxymethylcellulose was changed to 0.97 parts in terms of solid content, and the amount of the aqueous solution containing the water-soluble polymer 1 It was changed to 0.03 parts based on the amount of the water-soluble polymer 1.

[0292] Except for the above matter, it carried out similarly to Example 1, the slurry for negative electrodes, a negative electrode, and a lithium ion secondary battery were manufactured and evaluated.

Embodiment 3

[0294] In the above (manufacture of 1-1. particulate-form polymer), the quantity of 1, 3- butadiene was changed to 33 parts, and the quantity of itaconic acid was changed to 1 part.

[0295] In the above (1-3. Manufacture of negative electrode slurry), the amount of the 1% aqueous solution of carboxymethylcellulose was changed to 0.97 parts in terms of solid content, and the amount of the aqueous solution containing the water-soluble polymer 1 It was changed to 0.03 parts based on the amount of the water-soluble polymer 1.

[0296] Except for the above matter, it carried out similarly to Example 1, the slurry for negative electrodes, a negative electrode, and a lithium ion secondary battery were manufactured and evaluated.

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Abstract

A slurry for lithium ion secondary battery negative electrodes, which contains a binder, a negative electrode active material, and a water-soluble polymer. The binder is a particulate polymer that contains 50-80% by weight of an aromatic vinyl monomer unit and 0.5-10% by weight of an ethylenically unsaturated carboxylic acid monomer unit. The particulate polymer has a surface acid amount of 0.20 meq / g or more, and the contact angle of the particulate polymer with a mixed solvent of ethylene carbonate and diethyl carbonate (ethylene carbonate / diethyl carbonate volume ratio = 1 / 2) is 50 degrees or less.

Description

technical field [0001] The invention relates to a slurry for negative electrodes of lithium ion secondary batteries, an electrode for lithium ion secondary batteries, a manufacturing method thereof, 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. Lithium-ion secondary batteries are often used as secondary batteries that can be used as power sources for these portable terminals. 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, secondary batteries are also required to be smaller, thinner, lighter, and higher in performance similarly to portable terminals. [0003] In order to achieve higher performance of secondary batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/052H01M10/0566
CPCH01M4/134H01M4/1395H01M4/622H01M10/0525Y02E60/10H01M4/139H01M4/38
Inventor 高桥直树佐佐木智一
Owner ZEON CORP
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