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Method for continuously preparing lithium battery diaphragm by utilizing melt spinning process

A lithium battery separator and melt spinning technology, which is applied in the manufacture of rayon, battery pack components, circuits, etc., can solve the problems of uneven porosity of the separator and complicated stretching process, and achieve the effect of improving the wettability.

Inactive Publication Date: 2021-02-26
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problems of complex stretching process and uneven porosity of the existing lithium battery diaphragm, the present invention proposes a method for continuously preparing lithium battery diaphragm by melt spinning process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation of the method for continuously preparing lithium battery separators by melt spinning process:

[0034](1). Mix TEOS, absolute ethanol, deionized water, and hydrochloric acid with a mass fraction of 28% according to the mass ratio of 1:3.8:6.4:0.085, and then react in a water bath at 65°C for 10 hours to obtain a silica sol. After cooling to room temperature, slowly add lithium hydroxide aqueous solution. After the pH of the solution system is alkaline, add inorganic filler magnesium oxide with a particle size of 10nm. The amount of inorganic filler added is 2% of the mass of silica sol, and continue to add hydroxide Lithium aqueous solution, the total addition of lithium hydroxide is 1% of the mass of the silica sol, keep stirring, react for 6h, obtain the modified silica sol loaded with inorganic fillers; leave the obtained solvent to stand and age for more than 24h, centrifuge Separation and vacuum drying to obtain porous silica gel powder loaded with ...

Embodiment 2

[0037] The preparation of the method for continuously preparing lithium battery separators by melt spinning process:

[0038] (1). Mix TEOS, absolute ethanol, deionized water, and hydrochloric acid with a mass fraction of 28% according to the mass ratio of 1:3.8:6.4:0.085, and then react in a water bath at 60°C for 10 hours to obtain a silica sol. After cooling to room temperature, slowly add lithium hydroxide aqueous solution. After the pH of the solution system is alkaline, add inorganic filler magnesium oxide with a particle size of 5nm. The amount of inorganic filler added is 2% of the mass of the silica sol. Continue to add hydroxide Lithium aqueous solution, the total amount of lithium hydroxide added is 1% of the mass of silica sol, keep stirring, react for 4 hours, obtain the modified silica sol loaded with inorganic fillers; leave the obtained solvent to stand and age for more than 24 hours, centrifuge Separation and vacuum drying to obtain porous silica gel powder lo...

Embodiment 3

[0041] The preparation of the method for continuously preparing lithium battery separators by melt spinning process:

[0042] (1). Mix TEOS, absolute ethanol, deionized water, and hydrochloric acid with a mass fraction of 28% according to the mass ratio of 1:3.8:6.4:0.085, and then react in a water bath at 65°C for 11 hours to obtain a silica sol. After cooling to room temperature, slowly add lithium hydroxide aqueous solution. After the pH of the solution system is alkaline, add inorganic filler magnesium oxide with a particle size of 5nm. The amount of inorganic filler added is 1% of the mass of the silica sol. Continue to add hydroxide Lithium aqueous solution, the total addition of lithium hydroxide is 1% of the mass of silica sol, keep stirring, react for 5h, obtain the modified silica sol loaded with inorganic filler; put the obtained solvent to stand and age for more than 24h, centrifuge Separation and vacuum drying to obtain porous silica gel powder loaded with inorgan...

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Abstract

The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to a method for continuously preparing a lithium battery diaphragm by utilizing a melt spinning process. The method comprises the steps: mixing TEOS, absolute ethyl alcohol, deionized water and hydrochloric acid with the mass fraction of 28%, reacting at the temperature of 60-65 DEG C for 10-11 hours, cooling to room temperature, slowly adding a lithium hydroxide aqueous solution, adding an inorganic filler after the pH value of the solution system is alkaline, continuously adding the lithium hydroxide aqueous solution, stirring to react for 4-6 hours, standing and aging for 24 hours or more, centrifugally separating, and drying in vacuum to obtain porous silicon dioxide gel powder loaded with the inorganic filler; uniformly mixing PP granules with the porous silicon dioxide gel powder loaded with the inorganic filler and a coupling agent, heating, melt-blowing and spinning to form a film at the temperature of 200-230 DEG C, soaking the film material obtained by spinning in diluted hydrochloric acid, washing with deionized water, and drying to obtain the product. The diaphragm obtained by the method provided by the invention has uniform pores.

Description

technical field [0001] The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a method for continuously preparing lithium battery diaphragms by using a melt spinning process. Background technique [0002] Lithium batteries have excellent properties such as environmental protection and no memory effect, and have become one of the most popular new energy sources in the 21st century. Diaphragm is a kind of microporous material. The material itself is an insulator. It separates the positive and negative electrodes in the battery and prevents internal short circuit. At the same time, the micropores pass through the electrolyte to ensure ion conduction and form a current loop. Therefore, in addition to the need for specific micropores in the lithium-ion battery separator to make it have good ion permeability, it is very concerned about the safety of its use in the battery, that is, to prevent the positive and negative electrodes fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403D04H1/544D01F6/46D01F1/10D06M11/13D06M101/20
CPCD01F1/10D01F6/46D04H1/544D06M11/13D06M2101/20
Inventor 陈庆廖健淞司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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