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Water-based adhesive for high-temperature-resistant graphene manganese-rich lithium ion battery diaphragm

A water-based adhesive, manganese-rich lithium technology, applied in the direction of non-polymer adhesive additives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problem that adhesives do not have high temperature resistance, Adhesive peeling, damage, etc.

Inactive Publication Date: 2022-08-05
安徽力源新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing adhesives do not have good high temperature resistance, which will cause the adhesive to fall off and be damaged when the temperature rises, and eventually cause the diaphragm to be damaged. Therefore, there is an urgent need for a high temperature resistant graphene manganese-rich lithium Ion battery separator water-based adhesive to solve the above problems

Method used

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  • Water-based adhesive for high-temperature-resistant graphene manganese-rich lithium ion battery diaphragm
  • Water-based adhesive for high-temperature-resistant graphene manganese-rich lithium ion battery diaphragm
  • Water-based adhesive for high-temperature-resistant graphene manganese-rich lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment is a temperature-resistant modified polyurethane emulsion, and the preparation method includes the following steps

[0046] A1: Add 0.1mol of 4,4'-dihydroxybiphenyl and 15mL of ethyl acetate into a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, at a temperature of 0°C and a stirring rate of 200r / min Stir until 4,4'-dihydroxybiphenyl is completely dissolved under conditions, and then add 60 mL of concentrated nitric acid with a mass fraction of 65% and a concentrated sulfuric acid with a mass fraction of 95% dropwise while stirring. The resulting mixed acid was controlled at a drop rate of 1 drop / s. After the dropwise addition, the temperature was raised to 10 °C and the reaction was continued for 4 hours. After the reaction, the reaction product was vacuum filtered, and the filter cake was washed twice with distilled water. After that, it was placed in a vacuum drying oven and dried for 3 hours at a tem...

Embodiment 2

[0054] This embodiment is a temperature-resistant modified polyurethane emulsion, and the preparation method includes the following steps

[0055] A1: Add 0.1mol of 4,4'-dihydroxybiphenyl and 20mL of ethyl acetate into a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, at a temperature of 5°C and a stirring rate of 300r / min Stir until 4,4'-dihydroxybiphenyl is completely dissolved, and then add 80 mL of concentrated nitric acid with a mass fraction of 68% and a concentrated sulfuric acid with a mass fraction of 98% dropwise while stirring to mix at a mass ratio of 1:3. The resulting mixed acid was controlled at a drop rate of 2 drops / s. After the dropwise addition, the temperature was raised to 15°C and the reaction was continued for 6 hours. After the reaction, the reaction product was vacuum filtered, and the filter cake was washed with distilled water 3 times. After that, it was placed in a vacuum drying oven and dried for 5...

Embodiment 3

[0063] The present embodiment is a preparation method of a high temperature resistant graphene manganese-rich lithium ion battery separator water-based adhesive, comprising the following steps:

[0064] Step 1: Weigh 70 parts of temperature-resistant modified polyurethane emulsion, 10 parts of nano-iron tetroxide powder, 0.8 parts of antioxidant, 0.5 part of defoamer, and 1.5 parts of thickener according to weight parts from Example 1 , 1.0 part of silane coupling agent and 0.5 part of isocyanate curing agent, for standby; antioxidant is antioxidant 1076, defoamer is silicone defoamer, thickener is methyl cellulose, silane coupling agent It is silane coupling agent KH-550, and the isocyanate curing agent is xylylene diisocyanate;

[0065] Step 2: stirring and mixing the temperature-resistant modified polyurethane emulsion, nano-ferric oxide powder, antioxidant, defoaming agent, thickening agent and silane coupling agent for 1 h under the condition of a stirring speed of 2000 r...

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Abstract

The invention relates to the field of battery diaphragms, in particular to a high-temperature-resistant graphene water-based adhesive for a manganese-rich lithium ion battery diaphragm, which is used for solving the problems that an existing adhesive does not have good high-temperature resistance, the adhesive falls off and is damaged when the temperature rises, and finally the diaphragm is damaged, and particularly relates to a high-temperature-resistant graphene water-based adhesive for a manganese-rich lithium ion battery diaphragm. The temperature-resistant modified polyurethane emulsion has good heat resistance and high temperature resistance, the thermal decomposition temperature of the nanometer ferroferric oxide powder is high, the high temperature resistance of the temperature-resistant modified polyurethane emulsion can be further improved by adding the nanometer ferroferric oxide powder into the temperature-resistant modified polyurethane emulsion, and therefore it can be guaranteed that the battery diaphragm is not heated to deform or be damaged under the high-temperature condition, and the service life of the battery diaphragm is prolonged. According to the present invention, the aqueous binder is added to the graphene manganese-rich lithium ion battery, such that the phenomena of local short circuit caused by membrane rupture, even fire and even explosion due to further expansion of the short circuit can be avoided, the aqueous binder has the good flame retardation effect, the aqueous binder can be self-extinguished in a short time even fire occurs so as to avoid the fire, and the safety of the graphene manganese-rich lithium ion battery is improved.

Description

technical field [0001] The invention relates to the field of battery separators, in particular to a high temperature-resistant graphene-manganese-rich lithium-ion battery separator water-based adhesive. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long charge-discharge cycle life, and small self-discharge. They are widely used in electric vehicles, communication equipment, aerospace, portable electrical appliances and other fields. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and non-aqueous electrolytes. At present, as separators, porous films composed of polyethylene (PE) or polypropylene (PP) are mostly used. Heat shrinks, and takes advantage of this to perform the cutting function. However, if the degree of thermal shrinkage is too large, a local short circuit caused by film rupture or the like will occur, and the short circuit may further expan...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J175/08C09J11/04C09J11/06C08G18/66C08G18/48C08G18/42C08G18/32C08G18/10H01M10/42H01M50/446H01M50/449H01M50/489
CPCC09J175/06C09J175/08C09J11/04C09J11/06C08G18/6666C08G18/6633C08G18/4833C08G18/4277C08G18/10H01M50/449H01M50/446H01M50/489H01M10/4235C08K2003/2275C08K2201/011C08G18/3897C08G18/3889C08G18/3206C08K3/22C08K5/29Y02E60/10
Inventor 席柳江杨红帅张思方杨翔宇黄鹏磊
Owner 安徽力源新能源有限公司
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