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Aqueous resin composition for lithium ion secondary battery binder, and separator for lithium ion secondary battery

A technology of resin composition and secondary battery, which is applied in the direction of secondary battery, battery components, separators/films/diaphragms/spacers, etc., and can solve the problems of insufficient low-temperature film-forming properties of water-based resin compositions, etc. , to achieve the effects of excellent adhesion and low-temperature film-forming properties

Pending Publication Date: 2022-04-12
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this aqueous resin composition has the problem of insufficient low-temperature film-forming properties

Method used

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  • Aqueous resin composition for lithium ion secondary battery binder, and separator for lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (Example 1: Preparation and Evaluation of Lithium-ion Secondary Battery Binder Water-based Resin Composition (1))

[0051] 300 parts by mass of ion-exchanged water was put into a 2L reaction vessel equipped with a stirrer, a thermometer, and a cooler, and heated to 80° C., and 85 parts by mass of ST and 2-ethylhexyl acrylate (hereinafter referred to as Denoted as "2EHA".) 13 parts by mass and methacrylic acid (hereinafter, abbreviated as "MAA".) 2 parts by mass ion exchange with 3 parts by mass of sodium dodecylbenzenesulfonate and 0.05 parts by mass of ammonium persulfate 40 parts by mass of water solution was emulsified for 2 hours, after emulsion polymerization, 0.01 part by mass of ammonium persulfate was added, and 15.8 parts by mass of MMA, 3 parts by mass of 2EHA, and MAA of 1 part by mass were added dropwise. and ethylene glycol dimethacrylate (hereinafter, abbreviated as "EDM") 0.2 parts by mass of the mixture for 1 hour, polymerized, kept for 2 hours, cooled t...

Embodiment 2

[0070] (Example 2: preparation and evaluation of the aqueous resin composition (2) for lithium ion secondary battery binder)

[0071] 300 parts by mass of ion-exchanged water was put into a 2L reaction vessel equipped with a stirrer, a thermometer, and a cooler, heated to 80°C, and 85 parts by mass of ST, 13 parts by mass of BA, and 2 parts by mass of MAA was emulsified with 40 parts by mass of ion-exchanged water solution of 3 parts by mass of sodium dodecylbenzenesulfonate and 0.05 parts by mass of ammonium persulfate for 2 hours. After emulsion polymerization, 0.01 mass of ammonium persulfate was dropped. After that, further dropwise add a mixture of 15.8 parts by mass of MMA, 3 parts by mass of BA, 1 part by mass of MAA and 0.2 parts by mass of EDM for 1 hour to carry out polymerization, cool to below 40°C after keeping for 2 hours, and use ammonia water to The pH was adjusted to 7-8, and the non-volatile components were adjusted to 24-26% with ion-exchanged water. The ob...

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Abstract

Provided is an aqueous resin composition for a lithium ion secondary battery binder, the aqueous resin composition being characterized by containing core-shell particles (A) having a core part containing a polymer (a1) and a shell part containing a polymer (a2), the polymerization initiator in the starting material of the polymer (a1) being 0.01-0.2 parts by mass per 100 parts by mass of the monomer, and the aqueous medium (B) being a mixture of the core-shell particles (A), the shell part containing the polymer (a2), and the core part containing the polymer (a1) and the shell part containing the polymer (a2). The polymerization initiator in the raw material of the polymer (a2) is 0.01-0.2 parts by mass per 100 parts by mass of the monomer. The aqueous resin composition has excellent low-temperature film-forming properties, and can obtain a binder having excellent adhesion to a porous body and an electrode constituting a separator, and thus is suitable for use as a binder for a lithium ion secondary battery.

Description

technical field [0001] The present invention relates to an aqueous resin composition that can be used as a binder for lithium ion secondary battery separators. Background technique [0002] As a separator used in the manufacture of a lithium ion secondary battery, a porous body obtained from a polyolefin resin or the like is generally used in many cases. A lithium ion secondary battery generally functions as a battery when ions in an electrolytic solution move through pores constituting a separator. [0003] On the other hand, while the output of the lithium ion secondary battery is increasing, there is concern that the lithium ion secondary battery may cause problems such as ignition due to abnormal heat generation. As a method of preventing the above-mentioned ignition etc., for example, a method of using a separator in which the microporosity of the separator can be made non-porous due to the influence of heat when the lithium ion secondary battery generates heat is know...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/409H01M50/417
CPCH01M50/409Y02E60/10H01M10/0525
Inventor 梶川正浩
Owner DIC CORP
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