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Para-aramid polymer, lithium battery diaphragm and preparation method thereof, and lithium battery

A technology of lithium battery diaphragm and para-aramid, which is applied in the direction of secondary batteries, battery pack parts, circuits, etc., and can solve the problems of increasing production costs, poor bonding performance between inorganic coatings and substrates, and easy powder loss.

Pending Publication Date: 2021-04-09
QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the safety problems of polyvinylidene fluoride and acetone as coating materials and the problems of harsh production conditions and difficulty in mass production. At the same time, it solves the problems of poor bonding between inorganic coatings and substrates, easy powder falling, and inorganic particles absorb water. Problems that lead to increased production costs

Method used

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  • Para-aramid polymer, lithium battery diaphragm and preparation method thereof, and lithium battery
  • Para-aramid polymer, lithium battery diaphragm and preparation method thereof, and lithium battery
  • Para-aramid polymer, lithium battery diaphragm and preparation method thereof, and lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0058] In an inert gas environment, add the co-solvent calcium chloride to dimethyl phthalate and mix, heat to 100°C, stir and dissolve and then cool down to room temperature. The amount of co-solvent calcium chloride added is dimethyl phthalate 3% of the mass of ester, add silicon oxide particles and mix evenly, the amount of silicon oxide particles added is 20% of the mass of dimethyl phthalate, and the particle size is 10 μm;

[0059] Then add p-phenylenediamine, stir to dissolve, cool to 5°C, then add terephthaloyl dichloride, the molar ratio of terephthaloyl dichloride to p-phenylenediamine is 1.2:1, after the reaction is completed, adjust the pH value to neutral;

[0060] This embodiment also provides a lithium battery separator, the preparation method of which comprises the following steps:

[0061] Degassing treatment: Degassing the para-aramid polymer until there are no bubbles; the temperature of the degassing treatment is 45°C, and the time is 40 minutes;

[0062]...

Embodiment 2

[0075] Under an inert gas environment, add the co-solvent lithium chloride into dimethylacetamide and mix, heat to 65°C, stir and dissolve, then cool down to room temperature, and the amount of co-solvent lithium chloride is 5% of the mass of dimethylacetamide. %, add zinc oxide particles and mix evenly, the amount of zinc oxide particles added is 10% of the mass of dimethylacetamide, and the particle size is 5 μm;

[0076] Then add p-phenylenediamine, stir to dissolve, cool to 0°C, then add terephthaloyl dichloride, the molar ratio of terephthaloyl dichloride to p-phenylenediamine is 1:1, after the reaction is completed, adjust the pH value to neutral;

[0077] This embodiment also provides a lithium battery separator, the preparation method of which comprises the following steps:

[0078] Degassing treatment: Degassing the para-aramid polymer until there are no bubbles; the temperature of the degassing treatment is 45°C, and the time is 5 minutes;

[0079] Coating: Coat th...

Embodiment 3

[0085] Under an inert gas environment, the co-solvent calcium chloride is added to N-methylpyrrolidone and mixed, heated to 85 ° C, stirred and dissolved and then lowered to room temperature, the addition of the co-solvent calcium chloride is 4% of the reaction solvent quality. Alumina particles are added and mixed evenly, the amount of alumina particles added is 15% of the mass of N-methylpyrrolidone, and the particle size is 0.01 μm;

[0086] Then add p-phenylenediamine, stir to dissolve, cool to 0°C, then add terephthaloyl chloride, the molar ratio of terephthaloyl chloride to p-phenylenediamine is 1.1:1, and adjust the pH value to neutral;

[0087] This embodiment also provides a lithium battery separator, the preparation method of which comprises the following steps:

[0088] Degassing treatment: Degassing the para-aramid polymer until there are no bubbles; the temperature of the degassing treatment is 50°C, and the time is 30 minutes;

[0089] Coating: Coat the above-m...

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Abstract

The invention provides a para-aramid polymer, a lithium battery diaphragm and a preparation method thereof, and a lithium battery, and relates to the field of lithium batteries. The para-aramid polymer is prepared by: adding a cosolvent into a reaction solvent in the presence of inert gas, conducting heating, stirring and dissolving, then performing cooling to room temperature, adding ceramic particles, and uniformly stirring and dispersing the substances; adding p-phenylenediamine, performing dissolving, conducting cooling, adding paraphthaloyl chloride, carrying out reaction, and adjusting the pH value to neutral; wherein the reaction temperature ranges from -5DEG C to 5DEG C, and the reaction time is 3-30min. The lithium battery diaphragm comprises a base material and a coating layer coated on the surface of the base material, and the coating layer is prepared from the para-aramid polymer. The preparation method of the lithium battery diaphragm comprises the following steps: coating the base material with the para-aramid polymer with a thickness of 1-10microm, allowing the product to stay in air for 5-100 seconds, and carrying out solidification treatment and drying treatment; and carrying out defoaming treatment on the para-aramid polymer before coating. The lithium battery includes the lithium battery diaphragm. The lithium battery prepared from the lithium battery diaphragm provided by the invention is good in safety performance.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a para-aramid polymer, a lithium battery diaphragm, a preparation method and a lithium battery. Background technique [0002] Lithium batteries have many advantages and are widely used. However, frequent safety accidents have attracted widespread attention. As one of the key components of lithium batteries, the separator can provide lithium ion transmission channels and prevent short-circuiting of the positive and negative contacts, which has a very important impact on the safety of lithium batteries. . Therefore, improving the safety of lithium batteries by improving the performance of the separator has attracted more and more attention. [0003] Polyolefin separators are currently the most widely used lithium battery separators, but polyolefin separators have the problems of high heat shrinkage and insufficient electrolyte wettability. The most widely used ones are PE and PP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/32C08G69/04C08K3/36C08K3/22H01M50/446H01M50/434H01M50/423H01M50/403H01M10/0525
CPCC08G69/32C08G69/04C08K3/36C08K3/22H01M10/0525C08K2003/2296C08K2003/2227C08K2003/222Y02E60/10
Inventor 陈继朝公言飞刘鹏梁云静胡一波
Owner QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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