Special aqueous adhesive for ceramic diaphragm of lithium battery, and preparation method and application thereof

A technology of ceramic diaphragm and adhesive, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of limited use conditions and modification range, adhesive failure, emulsion structure damage, etc., and achieve good thermal stability. Mechanical stability and thermochemical stability, good dispersion and adhesiveness, good adhesive effect

Active Publication Date: 2019-07-12
湖南高瑞电源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, emulsion is a thermodynamically unstable system, so this type of water-based emulsion adhesive is susceptible to mechanical action, electrolyte, freezing, heating, etc. during production and subsequent storage, and the emulsion structure is gradually destroyed during long-term storage , and then delamination, flocculation, precipitation, etc. lead to the failure of the adhesive, thus limiting its use conditions and modification range

Method used

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  • Special aqueous adhesive for ceramic diaphragm of lithium battery, and preparation method and application thereof
  • Special aqueous adhesive for ceramic diaphragm of lithium battery, and preparation method and application thereof
  • Special aqueous adhesive for ceramic diaphragm of lithium battery, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]Put 30g of itaconic acid and 120g of water into the three-necked bottle equipped with a stirring device and a condenser, start stirring, and the water bath is heated to 60°C and stirred until the itaconic acid is completely dissolved. Add 30g of 2-hydroxyethyl acrylate and stir slightly to make it fully miscible with water. Weigh 0.3 g of ammonium persulfate and 0.6 g of N-methylolacrylamide, put them into a three-necked flask and stir until completely dissolved. Keep stirring, raise the reaction temperature to 75~80°C, and react for 3~4h. At this time, the viscosity of the reaction solution increased slightly, and the theoretical solid content was 33.7%. Taking a little reaction solution, the actual solid content was 31.7%, and the conversion rate was estimated to be 94%. Lower the temperature to 25~30°C, add a saturated aqueous solution of sodium hydroxide or ammonia water dropwise to the reaction liquid, adjust the pH value of the product to 5.5±0.2, and discharge af...

Embodiment 2

[0047] 120 g of pure water was put into the beaker, followed by adding 18.4 g of sodium hydroxide while stirring until a uniform solution was formed, and then allowed to cool to room temperature. Then add 30g of itaconic acid and stir until it is completely dissolved. During the dissolution process, keep a cold water bath to take away the heat released during the dissolution and neutralization process in time. Subsequently, 1.2 g of N-methylol acrylamide, 0.3 g of ammonium persulfate and 30 g of hydroxyethyl acrylate were respectively added, stirred evenly, and poured into a three-necked bottle equipped with a stirring device and a condenser. Start stirring and react at 75~80°C for 2.5~3h. Take another beaker, put in 120g of pure water and 30g of itaconic acid, heat and stir in a water bath at 60°C until completely dissolved, then dissolve in 30g of hydroxyethyl acrylate and 0.15g of ammonium persulfate. Pour the solution into a three-necked bottle, keep stirring, continue th...

Embodiment 3

[0049] Put 120g of pure water into the beaker, add sodium hydroxide and stir to dissolve to control the pH to 4.5±0.1, then put in 30g of itaconic acid and stir to dissolve, measure the pH value of the solution, and add an appropriate amount of sodium hydroxide as required to control the pH of the solution. The pH value is 4.5±0.1. Then put in 0.6g of N-methylolacrylamide, 0.3g of potassium persulfate and 30g of hydroxyethyl acrylate successively, stir evenly, pour into a three-necked bottle with a stirring device and a condenser, start stirring, and store at 75~80°C React for 3~4h, cool and collect. The product is a light yellow transparent viscous homogeneous solution with a pH value of 4.6±0.2 and a viscosity of about 20000~30000cp.

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Abstract

The invention discloses a special aqueous adhesive for the ceramic diaphragm of a lithium battery, and a preparation method and an application thereof. The adhesive is a solution formed by dissolvinga water-soluble raw material in water and performing polymerization, the pH value of the solution is controlled to 4.0-8.0 by using a neutralizing agent, and the water-soluble raw material and water of the adhesive comprise, by weight, 150-300 parts of a water-soluble unsaturated polycarboxylic acid, 100-250 parts of a water-soluble unsaturated carboxylate, 1-20 parts of a crosslinking monomer, 0-10 parts of a crosslinking agent, 0.5-5 parts of an initiator and 500-2000 parts of water. The adhesive has outstanding indicators and excellent performances. A thermodynamically stable solution system is selected to replace a thermodynamically unstable emulsion system in the prior art, so the preparation process of the adhesive and the stability of the obtained product are effectively improved, the feeding and producing processes are effectively simplified, the stability of the product is high, the storage conditions of the product have no special requirements, and the production, storage andtransportation cost is reduced.

Description

technical field [0001] The invention relates to an adhesive, in particular to an aqueous solution adhesive specially used for lithium-ion battery ceramic separators, a preparation method and application thereof. Background technique [0002] All kinds of new energy batteries represented by lithium-ion batteries are widely used in daily life and cutting-edge technology fields. With the increasing demand for new energy batteries in the market, how to improve production efficiency and expand production capacity under the premise of ensuring the safety and effectiveness of batteries has become an urgent issue for major new energy battery manufacturers and their upstream suppliers. . The main components of the battery include the shell, the electrolyte, the positive and negative electrodes, and the diaphragm. Among them, the diaphragm as the core component of the battery is currently mainly coated with powder ceramics, and its production involves preparing the powder ceramic mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/20C08F222/02C08F220/58H01M2/16H01M10/0525H01M50/431
CPCC08F222/02C08F220/20H01M10/0525H01M50/431C08F220/58Y02E60/10
Inventor 蔡小川刘龙席柳江刘海明黄梦琴
Owner 湖南高瑞电源材料有限公司
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