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Lithium-ion battery diaphragm master batch and preparation method thereof

A lithium-ion battery and diaphragm technology, applied in the field of lithium-ion battery diaphragm masterbatch and its preparation, can solve the problems of low melting temperature, poor electrolyte wettability, poor heat resistance, etc., and achieve improved heat resistance, excellent toughness, good Hydrophilic effect

Inactive Publication Date: 2013-04-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium-ion battery with good heat resistance and good electrolyte infiltration for the shortcomings of traditional high-density polyethylene lithium-ion battery separators, such as poor heat resistance (low melting temperature) and poor electrolyte wettability. Diaphragm masterbatch, the masterbatch can be directly used in the production of lithium-ion battery separators, avoiding the cumbersome steps caused by the selection of common raw materials for the production of lithium-ion battery separators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Hydrophilic modified aluminum oxide is prepared by the following steps:

[0035] (1) adding equal mass of aluminum oxide nano powder and succinic anhydride with a particle size of 50nm to 200nm in the solvent methylene chloride (3 times the quality of aluminum oxide nano powder), stirring at room temperature for 12 hours; Filter and remove the solvent, wash and filter the obtained solid with distilled water, and dry it in a vacuum oven at 60C to obtain carboxylated aluminum oxide; 50nm to 200nm refers to the particle size of aluminum oxide nanopowder, excluding butanediol Anhydride particle size. Succinic anhydride is a chemical reagent that is soluble in various solvents including water, and the particle size is generally not marked.

[0036] (2) Dissolve an equivalent amount of [2-(methacryloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide and ethylenediamine in methanol, stir at 40C for 20 hour, then the solvent was removed by rotary evaporation under r...

Embodiment 2

[0043] Hydrophilic modified aluminum oxide is prepared by the following steps:

[0044] (1) adding equal mass of aluminum oxide nano powder and succinic anhydride with a particle size of 50nm to 200nm in the solvent methylene chloride (3 times the quality of aluminum oxide nano powder), stirring at room temperature for 24 hours; Filtrate, remove solvent, wash and filter gained solid with distilled water, dry at 80 ℃ in vacuum oven, obtain the aluminum sesquioxide of carboxylation;

[0045] (2) Dissolve an equivalent amount of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide and ethylenediamine in methanol, stir at 60C for 24 hour, then decompressed rotary evaporation to remove the solvent, the resulting product was washed with ether, and dried at 40C in a vacuum oven to obtain aminated betaine;

[0046] (3) Carboxylated aluminum oxide powder and aminated betaine of equal mass are dissolved in dichloromethane solvent, add 1 / 10 mass part of carboxyl...

Embodiment 3

[0051] Hydrophilic modified aluminum oxide is prepared by the following steps:

[0052] (1) adding equal mass of aluminum oxide nano powder and succinic anhydride with a particle size of 50nm to 200nm in the solvent methylene chloride (3 times the quality of aluminum oxide nano powder), stirring at room temperature for 18 hours; Filtration, removal of solvent, washing and filtering the gained solid with distilled water, drying in a vacuum oven at 70°C to obtain carboxylated Al2O3;

[0053] (2) Dissolve an equivalent amount of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide and ethylenediamine in methanol, stir at 50C for 22 hour, then decompression rotary evaporation to remove the solvent, the product obtained was washed with ether, and dried at 35C in a vacuum oven to obtain aminated betaine;

[0054] (3) Carboxylated aluminum oxide powder and aminated betaine of equal mass are dissolved in dichloromethane solvent, add 1 / 10 mass part of carboxyl...

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Abstract

The invention discloses a preparation method of a lithium-ion battery diaphragm master batch. According to the part by weight, the lithium-ion battery diaphragm master batch is composed of 60-90 parts of high density polyethylene, 0.1-0.5 parts of a cross-linking agent, and 9.9-39.5 parts of hydrophilic modified aluminum oxide nanometer powder. The preparation method of the lithium-ion battery diaphragm master batch comprises the steps of: mixing all the components uniformly; then extruding, drawing and pelletizing at 160 DEG C to 180 DEG C to prepare the lithium-ion battery diaphragm master batch. As the hydrophilic modified aluminum oxide nanometer powder is adopted as a reinforcing and toughening agent and a hydrophilic filling material, the lithium-ion battery diaphragm master batch when being compared with a traditional high density polyethylene diaphragm raw material has more excellent toughness, higher melting temperature and higher electrolyte wettability; and therefore, the master batch is an important foundation for the preparation of a high-performance lithium-ion battery diaphragm material.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm material, in particular to a lithium-ion battery diaphragm masterbatch and a preparation method thereof; the lithium-ion battery diaphragm masterbatch can be used to manufacture a lithium-ion battery diaphragm with excellent performance. Background technique [0002] The lithium-ion battery separator is an important part of the lithium-ion battery. Its main function is to separate the positive and negative electrodes of the battery to prevent short circuit caused by contact between the two electrodes. In addition, it also has the function of allowing electrolyte ions to pass through. Therefore, the performance of the separator determines the capacity, internal resistance and cycle performance of the battery to a large extent, which is of great significance to improve the overall performance of the battery. At present, commercialized lithium-ion battery separators are mainly polyolefin materials s...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K9/04C08K5/14C08K3/22C09C1/40C09C3/08H01M2/16
CPCY02E60/10
Inventor 曾钫巫晓鑫赵建青吴水珠
Owner SOUTH CHINA UNIV OF TECH
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