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Binder composition for secondary battery negative electrode, slurry composition for secondary battery negative electrode, secondary battery negative electrode, secondary battery, and method for producing binder composition for secondary battery negat

A secondary battery and adhesive technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of electrode film hindering electrical conductivity and insufficient bonding strength, and achieve the goal of inhibiting viscosity increase, inhibiting Reaction and swelling reduction effect

Active Publication Date: 2013-06-26
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fluorine-based polymers such as polyvinylidene fluoride are used in this field, but there are problems such as hindering conductivity when forming an electrode film or insufficient bonding strength between the current collector and the electrode film.

Method used

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  • Binder composition for secondary battery negative electrode, slurry composition for secondary battery negative electrode, secondary battery negative electrode, secondary battery, and method for producing binder composition for secondary battery negat
  • Binder composition for secondary battery negative electrode, slurry composition for secondary battery negative electrode, secondary battery negative electrode, secondary battery, and method for producing binder composition for secondary battery negat
  • Binder composition for secondary battery negative electrode, slurry composition for secondary battery negative electrode, secondary battery negative electrode, secondary battery, and method for producing binder composition for secondary battery negat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0235] (manufacture of adhesive composition)

[0236] Put 33 parts of 1,3-butadiene, 1.5 parts of methacrylic acid, 65.5 parts of styrene, 0.4 parts of tertiary dodecyl mercaptan as a molecular weight regulator, and 4 parts of sodium dodecylbenzenesulfonate, 150 parts of ion-exchanged water, and 0.5 parts of potassium persulfate as a polymerization initiator were stirred thoroughly, then heated to 50°C to initiate polymerization. When the polymerization conversion rate reached 96%, cooling was performed to stop the reaction, and an aqueous dispersion liquid containing a binder was obtained.

[0237] Add 5% aqueous sodium hydroxide solution to the aqueous dispersion containing the above binder to adjust the pH to 8, then separate and remove unreacted monomers by heating and vacuum distillation, and then cool to below 30°C. Immediately thereafter, 5000ppm of α-methylstyrene dimer, 750ppm each of hydroxylamine sulfate and diethylhydroxylamine as an amine compound (1500ppm in tot...

Embodiment 2

[0249] Except that the addition amount of the α-methylstyrene dimer was 3500 ppm, the same operation as in Example 1 was performed to prepare a binder composition, a slurry composition, a negative electrode, and a battery, and evaluate them. The results are shown in Table 1.

Embodiment 3

[0251] As the negative electrode active material, use a BET specific surface area of ​​6m 2 / g of SiOC (volume average particle diameter: 18 μm), the same operation as in Example 1 was performed to prepare and evaluate a binder composition, a slurry composition, a negative electrode, and a battery. The results are shown in Table 1.

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Abstract

To provide a binder composition for a secondary battery, capable of improving the high temperature storage characteristics, high temperature cycle characteristics, and low temperature output characteristics of the secondary battery because the degree of swelling for the electrolyte of the secondary battery is small and the peel strength is large after immersion of the negative electrode in the electrolyte solution, and also to provide a slurry composition for a secondary battery negative electrode that uses this binder composition, a secondary battery negative electrode, and a secondary battery. [Solution] The binder composition for a secondary battery negative electrode according to the present invention is characterized by containing: a binder comprising 25 - 55% by mass of an aliphatic conjugated diene monomer unit, 1 - 10% by mass of an ethylenically unsaturated carboxylic acid monomer unit, and 35 - 74% by mass of another monomer unit copolymerizeable with these; and more than 3000 ppm and less than 7000 ppm of an alpha-methyl styrene dimer and 100 - 5000 ppm of an amine compound to 100 parts by weight of the binder.

Description

technical field [0001] The invention relates to a slurry composition for a negative electrode of a secondary battery, a negative electrode of a secondary battery and a secondary battery, in particular 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 rapidly. As secondary batteries used in the power supply of these portable terminals, nickel-hydrogen secondary batteries, lithium-ion secondary batteries, and the like are often used. Since portable terminals are required to be more comfortable in portability, miniaturization, thinning, weight reduction, and high performance have been rapidly developed. As a result, portable terminals are used in various places. In addition, similarly to porta...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M4/134H01M10/052H01M10/0566
CPCH01M4/133H01M4/134H01M4/622H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 佐佐木智一小林佳
Owner ZEON CORP
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