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Binder for secondary battery electrode, secondary battery electrode composition containing same, and secondary battery using same

一种电极组合物、二次电池的技术，应用在电池电极、二次电池、正电极等方向，能够解决电极活性材料和电池劣化、电极变形、电池特性劣化等问题，达到优异充电/放电寿命特性、防止电极变形、简化制备工序的效果

Active Publication Date: 2021-03-12
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The theoretical capacity of the battery varies depending on the type of negative electrode active material, but there is a phenomenon that the charge / discharge capacity generally decreases as the cycle progresses
[0008] This phenomenon is caused by the change in the electrode volume caused by the charge and discharge progress of the battery, thereby separating between the electrode active materials or between the electrode active materials and the electrode current collector, resulting in the electrode active materials unable to perform function
In addition, due to the change in the electrode volume during charge / discharge, the electrode is deformed, such as the solid electrolyte interface (SEI) film is damaged, resulting in more consumption of lithium contained in the electrolyte solution, thereby causing electrode active materials and The battery deteriorates due to the loss of the electrolyte solution
[0009] Previously used binders such as carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) have low adhesion, which becomes a major cause of deterioration in battery characteristics as charge / discharge progresses

Method used

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  • Binder for secondary battery electrode, secondary battery electrode composition containing same, and secondary battery using same
  • Binder for secondary battery electrode, secondary battery electrode composition containing same, and secondary battery using same
  • Binder for secondary battery electrode, secondary battery electrode composition containing same, and secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Embodiment 1: Preparation of binder for secondary battery electrodes

[0080] 26.7 g of methyl acrylate and 53.3 g of poly(vinyl alcohol) were placed in a 1 L reaction vessel equipped with a heater, cooler and stirrer, dissolved in 320 g of benzene and stirred. 2.256 g of benzoyl peroxide was added as an initiator and 16.6 g of 1-butanethiol was added as a chain transfer reactant. The temperature was raised to 110°C in a nitrogen atmosphere. After a reaction time of 4 hours, the initiator and the monomer were washed with methanol, and the resulting powder was stirred in excess n-hexane. An excess of 5N NaOH solution was added to the solution being stirred to replace the methyl groups in the methyl acrylate with Na ions by stirring for 2 hours. After the reaction, the resulting mixture was settled to obtain a powder, which was then dried in an oven at 60° C. to obtain a final synthesized binder powder.

[0081] The prepared binder powder had a weight average molecul...

Embodiment 2

[0083] An adhesive was prepared in the same manner as in Example 1 except that 16 g of methyl acrylate and 64 g of poly(vinyl alcohol) were used.

[0084] The prepared binder powder had a weight average molecular weight of 320,000, and a weight ratio between repeating units derived from poly(vinyl alcohol) and repeating units derived from sodium acrylate was 0.78:0.22.

Embodiment 3

[0089] 1) Preparation of negative electrode for secondary battery

[0090] 5.307 g of the binder powder prepared in Example 1 was placed in 100.833 g of water, and mixed at 70° C. and 1,500 rpm for 180 minutes by using a high-speed mixer to prepare a 5.0% by weight dispersion in which the binder was dispersed . 0.780 g of carbon black-based conductive material and 68.75 g of water were added to 4.117 g of binder dispersion liquid, and mixed and dispersed using a high-speed mixer. To the dispersed solution, 150.0 g of 20 μm artificial graphite (negative electrode active material) was added, and mixed by using a planetary mixer at 45 rpm for 40 minutes to prepare a slurry. 92.02 g of the remaining binder solution and 29.1 g of water were added to the slurry and mixed again by using a planetary mixer at 45 rpm for 40 minutes. The slurry thus prepared was a mixed solution (47.89% by weight of solid content) in which the negative electrode active material, the conductive materi...

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Abstract

The present invention relates to a binder for secondary battery electrodes, a composition for secondary battery electrodes containing the binder, and a secondary battery using the same, the binder comprising polyvinyl alcohol (PVA) and ion Copolymers of substituted acrylics. The binder has excellent electrode adhesion strength, prevents electrode deformation caused by expansion and contraction of electrode active materials, improves charge / discharge life characteristics, and further simplifies the manufacturing process.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2016-0088116 filed with the Korean Intellectual Property Office on July 12, 2016 and Korean Patent Application No. 10-2017-0087738 filed with the Korean Intellectual Property Office on July 11, 2017 , the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a binder for secondary battery electrodes, a secondary battery electrode composition containing the binder, and a secondary battery using the binder, which can have excellent electrode adhesion adhesion, can prevent deformation of the electrode due to expansion and contraction of the electrode active material, improve charge / discharge life characteristics, and further simplify the manufacturing process. Background technique [0004] With technological development and increased demand for mobile dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/587H01M4/38H01M10/0525C08F216/06C08F220/06
CPCH01M4/1393H01M4/364H01M4/133H01M4/483C08F261/04C08F8/12H01M10/0525H01M4/587H01M4/622C08F8/44Y02E60/10C08F220/14H01M4/386C08F216/06C08F220/06H01M2004/028H01M4/661H01M10/0569H01M2004/027H01M4/38
Inventor 金荣宰卢艺哲柳正宇朴峻秀
Owner LG ENERGY SOLUTION LTD
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