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Polymer composition for non-aqueous secondary batteries, and non-aqueous secondary battery

A secondary battery, non-aqueous technology, applied in non-aqueous electrolyte battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problem of insufficient adhesion between copolymer latex and current collectors or separators, Insufficient adhesion, damage to the charge-discharge cycle characteristics of secondary batteries, etc., to achieve good cycle characteristics and good initial capacity

Pending Publication Date: 2021-06-25
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be noted that the binder functions to improve the adhesion between the electrode layer containing the active material and the collector or the separator, but the adhesion of the above-mentioned copolymer latex to the collector or the separator may be will be insufficient
When the above-mentioned adhesiveness is insufficient, the charge-discharge cycle characteristics of the secondary battery tend to be impaired.

Method used

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  • Polymer composition for non-aqueous secondary batteries, and non-aqueous secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Ion-exchanged water was added to the reactor, and the temperature was raised and kept at 65° C. while stirring. After adding sodium persulfate (hereinafter also referred to as "NPS") as a polymerization initiator thereto, methacrylic acid (hereinafter also referred to as "monomer") as a monomer (hereinafter also referred to as "monomer") component was added dropwise. "MAA") and methacrylamide (hereinafter also referred to as "MAAm") dissolved in ion-exchanged water, and a 10% sodium hydroxide aqueous solution were used for 2 hours while maintaining the temperature at 65°C. After adding dropwise, polymerization was continued for 1 hour. Next, ethyl acrylate (hereinafter also referred to as "EA") was added dropwise, and polymerization was continued for 1 hour. As the mixing amount of each component at this time, when the total of the monomer components (units derived from all ethylenically unsaturated monomers: EA, MAA, MAAm) is 100 parts by mass, EA is 80 parts by mass,...

Embodiment 2～10 and comparative example 1～2

[0136] In each example, the compounding quantity of a monomer and 2-methyl-4-isothiazolin-3-one was changed as shown in Table 1.

Embodiment 5

[0137] In Example 5, MAA was also added in the compounding amount shown in Table 1 at the time of adding EA as a monomer constituting the core.

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Abstract

The present invention provides a polymer composition for a non-aqueous secondary battery and the non-aqueous secondary battery, which can exhibit good cycle characteristics and initial capacity. The polymer composition for the non-aqueous secondary battery, contains polymer particles, wherein the Young's modulus of the polymer particles is 1.5 GPa or less, the elastic deformation power of the polymer particles is 50% or less, and the electrolyte swelling degree of the polymer particles is 1.5 times or less.

Description

technical field [0001] The present invention relates to a polymer composition for a nonaqueous secondary battery and a nonaqueous secondary battery. Background technique [0002] Conventionally, as a method for producing electrodes used in electrochemical devices such as lithium-ion secondary batteries, the following method can be mentioned: adding a binder, a thickener, etc. to the electrode active material, and coating the obtained liquid composition The electrode layer is formed on the current collector by spreading it on the surface of the current collector and then drying it. Here, styrene-butadiene copolymer latex is known as a binder that has a high adhesive force to the metal constituting the current collector and can form a highly flexible electrode layer. It should be noted that the binder functions to improve the adhesion between the electrode layer containing the active material and the collector or the separator, but the adhesion of the above-mentioned copolyme...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M10/42C09D7/63C09D133/08
CPCH01M4/622H01M10/4235H01M10/0525C09D133/26C09D7/63C08K5/46Y02E60/10H01M4/62H01M4/13C08F265/06C08F220/56C08F220/18C08F2/44C08F8/34H01M50/414H01M2004/021H01M2300/0017
Inventor 岩本匡志古谷直美
Owner ASAHI KASEI KK
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