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Preparation method of composite membrane material applied to lithium battery diaphragm

A lithium battery separator and composite film technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of low density of layered films, high ionic conductivity, large specific surface area, etc., and achieve high liquid absorption rate , high affinity, high porosity effect

Inactive Publication Date: 2020-12-08
陈建夫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of the prepared fibers is between nanometers and micrometers, and the layered membrane formed by the accumulation of fibers has the characteristics of low density, large specific surface area, high porosity, and high ion conductivity, which can overcome the polyolefin separator prepared by the existing process The material has low porosity, low liquid absorption rate and poor wetting performance.

Method used

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  • Preparation method of composite membrane material applied to lithium battery diaphragm
  • Preparation method of composite membrane material applied to lithium battery diaphragm
  • Preparation method of composite membrane material applied to lithium battery diaphragm

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method for a composite membrane material applied to lithium battery separators, specifically comprising the following steps:

[0037] S1: Put polyethylene adipate diol and ethylene glycol in an oven at 110°C for 50 minutes and heat and dry them for 50 minutes, then take them out and cool them down to 40°C for use in the next step.

[0038] S2: Polyethylene adipate diol and ethylene glycol are joined in the ratio that is 50:1.1 with mass ratio to have thermometer, magnetic stirrer, reflux condensing tube and N 2 In the protected three-necked flask, turn on the magnetic stirrer to allow it to stir continuously, then add butanone, react at 45°C for 10 minutes, add toluene diisocyanate, raise the temperature to 65°C, and react for 3 hours to obtain a prepolymer .

[0039] S3: Add 2,2-dimethylolpropionic acid to the prepolymer, and continue to react at 65°C for 1 hour; then lower the temperature to 40°C, add triethylamine for neutralization, and then add deion...

Embodiment 2

[0043] A preparation method for a composite membrane material applied to lithium battery separators, specifically comprising the following steps:

[0044] S1: Put polyethylene adipate diol and ethylene glycol in an oven at 110°C for 50 minutes and heat and dry them for 50 minutes, then take them out and cool them down to 40°C for use in the next step.

[0045] S2: Polyethylene adipate diol and ethylene glycol are joined in the ratio that is 50:1.6 with mass ratio to have thermometer, magnetic stirrer, reflux condenser and N 2 In the protected three-necked flask, turn on the magnetic stirrer to allow it to stir continuously, then add butanone, react at 60°C for 10 minutes, add toluene diisocyanate, raise the temperature to 80°C, react for 3 hours, and obtain a prepolymer .

[0046] S3: Add 2,2-dimethylolpropionic acid to the prepolymer, and continue to react at 80°C for 1 hour; then lower the temperature to 50°C, add triethylamine for neutralization, and then add deionized wat...

Embodiment 3

[0050] A preparation method for a composite membrane material applied to lithium battery separators, specifically comprising the following steps:

[0051] S1: Put polyethylene adipate diol and ethylene glycol in an oven at 110°C for 50 minutes and heat and dry them for 50 minutes, then take them out and cool them down to 40°C for use in the next step.

[0052] S2: Polyethylene adipate diol and ethylene glycol are joined in the ratio that is 50:1.2 with mass ratio to have thermometer, magnetic stirrer, reflux condenser and N 2 In the protected three-necked flask, turn on the magnetic stirrer to allow it to stir continuously, then add methyl ethyl ketone, react at 45-60°C for 10min, add toluene diisocyanate, raise the temperature to 70°C, react for 3h, and obtain the prepared Polymer.

[0053] S3: Add 2,2-dimethylolpropionic acid to the prepolymer, and continue to react at 70°C for 1 hour; then lower the temperature to 45°C, add triethylamine for neutralization, and then add de...

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Abstract

The invention discloses a preparation method of a composite membrane material applied to a lithium battery diaphragm, the preparation method mainly comprises the following steps: reacting polyester polyol, ethylene glycol, butanone and toluene diisocynate at 60-80 DEG C under the N2 protection condition for 3-6 hours to obtain a prepolymer; then adding 2, 2-dimethylolpropionic acid into the prepolymer to carry out chain extension; after chain extension is completed, adding triethylamine for neutralization, then adding water for emulsification, and finally obtaining waterborne polyurethane emulsion; dissolving EVOH(polyethylene-vinyl alcohol)in a strongly polar solvent to prepare an EVOH solution; and preparing the two solutions into the composite membrane by adopting an electrostatic spinning opposite spraying method. The prepared waterborne polyurethane / EVOH nanofiber composite membrane material has the advantages of good stability, small thermal size shrinkage, high tensile strength,high liquid absorption rate and the like, and can be used as the lithium ion battery diaphragm material.

Description

technical field [0001] The invention belongs to the field of membrane material preparation, and in particular relates to a method for preparing a composite membrane material applied to lithium battery separators. Background technique [0002] Lithium-ion batteries have gradually become a research hotspot due to their advantages such as high power density, low self-discharge rate, no memory effect and stable discharge voltage. As the main component of the battery, the separator material has a crucial impact on the actual battery performance. The battery separator must be a poor conductor of electrons but also allow the passage of electrolyte ions, and have good chemical and electrochemical stability to maintain a high degree of wettability to the electrolyte. At the same time, it must have certain mechanical properties to withstand the battery assembly process. High tension. At present, commercial lithium-ion battery separators are mostly made by stretching polyolefin polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525D04H1/4291D04H1/4358D04H1/4382D04H1/728D04H3/007D04H3/009D04H3/02D01F6/70D01F6/30C08G18/66C08G18/42C08G18/34C08G18/32C08G18/76C08G18/12
CPCC08G18/12C08G18/4238C08G18/664C08G18/6659C08G18/7614D01D5/003D01F6/30D01F6/70D04H1/4291D04H1/4358D04H1/4382D04H1/728D04H3/007D04H3/009D04H3/02H01M10/0525C08G18/348Y02E60/10
Inventor 陈建夫
Owner 陈建夫
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