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Self-healing supermolecule polyamide adhesive as well as preparation method and application thereof

A molecular polyamide, self-healing technology, used in adhesives, electrical components, electrochemical generators, etc., can solve the problem of detachment of active materials and conductive substrates, poor adhesion, and the impact of adhesion performance on the cycle performance of lithium-ion batteries, etc. problem, to achieve excellent bonding effect

Active Publication Date: 2018-11-23
中知在线股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In lithium-ion batteries, although the amount of binder is less, its bonding performance has a great influence on the cycle performance of lithium-ion batteries
At present, the solvent-based binder used in the manufacturing process of lithium-ion batteries is mainly polyvinylidene fluoride (PVDF) / N-methylpyrrolidone (NMP) system, and the bonding effect of this bonding system will be better during the charging and discharging process. As the battery gets worse, the active material and conductive matrix will gradually fall off, resulting in a decline in battery performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Take 9.0g of ethylenediamine and 32g of methanol and mix them uniformly in a three-necked flask, place them in an ice-salt bath on a constant temperature magnetic stirrer and stir evenly, and gradually add 103.2g of them dropwise with a constant pressure dropping funnel under a nitrogen atmosphere. Methyl acrylate, after reacting for 24 hours, excess methanol and methyl acrylate were removed by rotary evaporation under reduced pressure to obtain a pale yellow oily liquid as the primary product. Weigh 20.2g of the initial product and dissolve it with 64g of methanol, add it into a three-necked flask under the condition of ice-salt bath, put 72g of ethylenediamine into the reaction system dropwise in a dropping funnel, react for 24h, and remove excess methanol by rotary evaporation under reduced pressure.

Embodiment 2

[0022] Example 2: Get 15.5g of diethylenetriamine and 32g of methanol and mix them uniformly in a three-necked flask, place them in an ice-salt bath on a constant temperature magnetic stirrer and stir evenly, and gradually add 103.2 g methyl acrylate, after reacting for 24h, excess methanol and methyl acrylate were removed by rotary evaporation under reduced pressure to obtain a light yellow oily liquid to obtain the initial product. Weigh 20.2g of the initial product and dissolve it with 64g of methanol, add it into a three-necked flask under the condition of ice-salt bath, put 123.6g of diethylenetriamine into the reaction system dropwise in the dropping funnel, react for 24h, and remove the excess by rotary evaporation under reduced pressure. Methanol.

Embodiment 3

[0023] Example 3: Get 102g of the product prepared in Example 2 and 26.5g of dimerized fatty acid Empol1016 and mix it evenly in a three-necked flask equipped with a reflux condenser, a mechanical stirring device, and a nitrogen ventilation device, and heat it to 80 degrees Celsius until the system becomes transparent. , and then heated to 160 ° C for 24 hours. After cooling, dissolve in chloroform, extract 5 times with methanol / deionized water mixture, and remove excess chloroform and methanol by rotary evaporation. Add 6.2g of urea and heat to 135°C, then react until rod climbing phenomenon occurs, take it out while hot, and obtain a glassy solid. Stir in warm water for 72 hours and dry in vacuum to obtain supramolecular self-healing adhesive.

[0024]Graphite, carbon black, and the binder prepared in Example 3 were used to prepare electrode slurry at a mass ratio of 8:1:1, and N-methylpyrrolidone was used to make the slurry. Cut out a copper sheet with a diameter of 1.4cm...

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PUM

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Abstract

The invention discloses a self-healing supermolecule polyamide adhesive and a preparation method thereof. The preparation method comprises the steps: evenly mixing polyamide with methyl alcohol, adding methyl acrylate to perform Michael addition reaction and performing amidation condensation reaction through a product after reaction and a methanol solution in which polyamide is evenly dispersed toobtain dendritic polyamide; evenly mixing with polyacid, warming to 60 to 80 DEG C to react until a system becomes transparent, then warming to 160 to 180 DEG C to react for 20 to 24 hours, extracting and rotary evaporating to remove impurities after cooling, then adding urea, warming to 130 to 140 DEG C, reacting, taking out when the climbing pole phenomenon appears, naturally cooling to room temperature of 20 to 25 DEG C to obtain glass-like solid, then stirring for 60 to 72 h in 50 to 60 DEG C warm water and vacuum drying to obtain the supermolecule self-healing adhesive. The adhesive disclosed by the invention has the characteristics of strong adhesion force, high viscosity and application to negative pole materials of graphite, silicon-based materials, tin-based materials and the like.

Description

technical field [0001] The invention belongs to the field of lithium ion battery adhesives, and relates to a self-healing supramolecular polyamide lithium ion battery adhesive and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of high-performance battery that has been developing rapidly in recent years. It has the advantages of high energy density, light weight, long service life, no memory, and no pollution. Its application range has covered civil, national defense, aerospace, etc. field. In lithium-ion batteries, although the amount of binder is less, its bonding performance has a great influence on the cycle performance of lithium-ion batteries. At present, the solvent-based binders used in the manufacturing process of lithium-ion batteries are mainly polyvinylidene fluoride (PVDF) / N-methylpyrrolidone (NMP) system, and the bonding effect of this bonding system will be better during the charging and discharging process. As t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J179/02C08G73/02H01M4/62H01M10/0525
CPCC08G73/028C09J179/02H01M4/622H01M10/0525Y02E60/10
Inventor 许鑫华张岩张丽芳
Owner 中知在线股份有限公司
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