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Binder resin for electrodes, cathode for secondary batteries, and lithium secondary battery comprising same

A binder resin and secondary battery technology, applied in secondary batteries, non-aqueous electrolyte batteries, positive electrodes, etc., to achieve uniform separation, improve reliability and battery characteristics, and increase adhesion

Active Publication Date: 2020-08-11
NOROO PAINT & COATINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this polar polymer has limitations in improving the cracking of binder materials due to volume changes during battery operation.

Method used

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  • Binder resin for electrodes, cathode for secondary batteries, and lithium secondary battery comprising same
  • Binder resin for electrodes, cathode for secondary batteries, and lithium secondary battery comprising same
  • Binder resin for electrodes, cathode for secondary batteries, and lithium secondary battery comprising same

Examples

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preparation example Construction

[0061] According to one embodiment, the synthesis method of the binder resin may include the step of reacting polyvinyl alcohol with a dialdehyde compound to form a first side chain group, making the polyvinyl alcohol formed with the first side chain group a step of reacting vinyl alcohol with an acrylic acid monomer to form a second side chain group and neutralizing the carboxylic acid group of the second side chain group with a base. In synthesizing the binder resin of the present invention, it is advantageous to adjust the molecular weight and viscosity by reacting polyvinyl alcohol and a dialdehyde compound before reacting polyvinyl alcohol and acrylic acid monomers.

[0062] A redox initiator may be used to synthesize the binder resin, and a neutralizer may be used to neutralize the binder resin. For example, the content of the redox initiator may be 0.5 to 3% by weight of the total solid content of the binder resin, and the content of the neutralizer may be 0.5 to 5% by ...

Embodiment 1

[0087] 45 g of polyvinyl alcohol (PVA) (POVAL from KURARAY, molecular weight: 2,400) and 500 g of water were put into a 1 L four-necked flask, and the temperature was raised to 90° C. to dissolve completely. Then add HCl and let it stand for 20 minutes. Afterwards, glutaraldehyde (Sigma Aldrich (Sigma Aldrich) reagent, in H 2 The content in O is 25%) 0.3 g was mixed with water 30 g and left for 2 hours. After that, the reactant was cooled to 50°C, and 1) a substance obtained by dissolving 1 g of ammonium persulfate (APS, ammonium persulfate) in 10 g of water, 2) NaHSO 3 0.3 g of the material obtained was dissolved in 3 g of water and left for 10 minutes. While injecting nitrogen gas, 35 g of acrylic acid (AA, acrylic acid), 15 g of hydroxyethylacrylamide (HEAA, hydroxyethylacrylamide, Sigma Aldrich reagent, 97% purity) and 250 g of water were mixed, dropped for 30 minutes, and left for 2 hours. Thereafter, an aqueous solution obtained by dissolving 0.5 g of NaOH in 3 g of ...

Embodiment 2

[0093] A binder resin was synthesized in the same manner as in Example 1 except that PVA (POVAL from Kuraray Corporation, molecular weight 1,700) was changed. The solid content in the binder resin was 11.3%, the viscosity was 4,500 cps, and the pH was 7.9. .

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Abstract

The invention provides a binder resin for electrodes of a secondary battery, a cathode for secondary batteries, and lithium secondary battery comprising same. The disclosed binder resin for a secondary battery electrode comprises: a polyvinyl alcohol main chain; a first side chain group derived from a dialdehyde compound bonded to the polyvinyl alcohol main chain; and a second side chain group derived from an acrylic monomer. According to the present invention, it is possible to prevent the separation of solids from a slurry containing a silicon-based active material, thereby achieving a uniform electrode density.

Description

technical field [0001] The present invention relates to a secondary battery, and more specifically, to a binder resin for an electrode of a secondary battery, a cathode for a secondary battery, and a lithium secondary battery containing the same. Background technique [0002] Lithium-ion secondary batteries have higher energy density than non-reusable primary batteries, are environmentally friendly, have a long life cycle, can output high voltage, and can be miniaturized, so they are widely used in mobile phones, tablet PCs, and camcorders recently. small portable electronic products. In addition to being used for small mobile phones, the use of electric vehicles, electric bicycles, electric motorcycles, electric scooters, wireless fans, wireless chargers, and energy storage systems has also shown a sharp upward trend recently. [0003] The lithium ion secondary battery includes the main components of an anode, a cathode, a separation membrane and an electrolyte. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/133H01M4/134H01M10/0525
CPCH01M4/133H01M4/134H01M4/622H01M10/0525H01M2004/028Y02E60/10H01M4/131H01M4/364H01M4/386H01M4/483H01M4/587H01M10/052
Inventor 金相坤朴德珉李昌勋郑钟五具滋敏
Owner NOROO PAINT & COATINGS
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