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Inorganic nanoparticle-modified aramid fiber paste and aramid-coated lithium battery composite diagram

A technology of inorganic nanoparticles and modified aramid fiber, which is applied in the direction of nanotechnology, nanotechnology, battery pack components, etc., and can solve the problem of limited improvement in high temperature resistance, poor heat resistance and mechanical properties of lithium battery separators, and aramid fibers The coating affects the air permeability and other issues, and achieves the effects of good processability, improved wettability, and improved air permeability

Inactive Publication Date: 2019-07-23
CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Aramid fibers need to be heated and dissolved. This process will lead to the introduction of more impurities into the aramid slurry, and the decomposition of some aramid fibers, resulting in poor heat resistance and mechanical properties;
[0007] 2. The existing aramid coating has limited improvement on the high temperature resistance of lithium battery separators;
[0008] 3. The existing aramid coating is easy to form dense holes and affect the air permeability

Method used

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  • Inorganic nanoparticle-modified aramid fiber paste and aramid-coated lithium battery composite diagram
  • Inorganic nanoparticle-modified aramid fiber paste and aramid-coated lithium battery composite diagram
  • Inorganic nanoparticle-modified aramid fiber paste and aramid-coated lithium battery composite diagram

Examples

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Effect test

Embodiment 1

[0046] One, the synthesis of silica nanoparticle modified aramid fiber slurry (such as figure 1 shown):

[0047] (1) Ethyl tetrasilicate and ethanol are reacted under the environment of PH=4 with the ratio of 1:1 to obtain silica nanoparticles; the synthesized silica nanoparticles are poured into dimethylacetamide , then add 1wt% silane coupling agent (KH-570), and react at room temperature for 24h to obtain silica nanoparticles modified by the coupling agent;

[0048](2) under room temperature condition, in reactor, add dimethylacetamide / calcium chloride solvent, pass into nitrogen, and stir, add the silica nanoparticle ( 2wt%), while adding p-phenylenediamine powder, so that the concentration of p-phenylenediamine is 8mg / mL;

[0049] (3) Lower the temperature of the reactor to about 0°C, and stir vigorously, then add 8.1 mg / mL terephthaloyl chloride powder, and continue stirring at high speed for 10 minutes, then add calcium hydroxide to make the pH of the synthesis soluti...

Embodiment 2

[0056] The difference between this embodiment and Example 1 is that the inorganic nanoparticles are titanium dioxide; in the titanium dioxide nanoparticle modified aramid fiber slurry, the aramid fiber percentage is 2.5wt%, and the titanium dioxide nanoparticle percentage is 3wt%. The percentage content of the joint agent is 1.5wt%.

Embodiment 3

[0058] The difference between this example and Example 1 is that the inorganic nanoparticles are magnesium oxide; in the magnesium oxide nanoparticle modified aramid slurry, the aramid fiber percentage is 5wt%, and the magnesium oxide nanoparticle percentage is 10wt%. , the percentage content of coupling agent is 2wt%.

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Abstract

The invention discloses inorganic nanoparticle-modified aramid fiber paste and an aramid-coated lithium battery composite diagram. The inorganic nanoparticle-modified aramid fiber paste comprises aramid, inorganic nanoparticle, a coupling agent and a solvent. The aramid-coated lithium battery composite diagram comprises a battery diagram and an aramid coating layer, wherein the aramid coating layer is coated at a single side or dual sides of the battery diagram, and the aramid coating layer is formed by coating the inorganic nanoparticle with modified aramid paste. The high-temperature resistant performance of the lithium battery diagram is greatly improved, and the air permeability of the lithium battery diagram is improved.

Description

technical field [0001] The invention belongs to the field of lithium battery separator materials, and in particular relates to an inorganic nanoparticle modified aramid slurry and an aramid coated lithium battery composite separator. Background technique [0002] As a new type of secondary battery, lithium battery has the advantages of high energy density and long cycle life. Its application range continues to expand and is widely used in portable electronic devices, electric tools, energy storage and power vehicles. With the rapid development, lithium batteries are more and more used in power vehicles. However, frequent lithium battery safety accidents have aroused widespread concern. Among them, the separator, as an important part of the lithium battery, can effectively prevent the short circuit between the positive and negative electrodes, which has a very important impact on the safety of the lithium battery. Therefore, the performance improvement and safety requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14B82Y30/00H01M50/403H01M50/446H01M50/449H01M50/489
CPCB82Y30/00H01M50/411H01M50/44H01M50/431H01M50/403Y02E60/10
Inventor 陶晶王志豪罗婷陈瀚
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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