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A kind of high temperature resistant aramid fiber lithium ion battery composite diaphragm and preparation method thereof

A lithium-ion battery and composite separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as small interface stress, and achieve the effects of small interface stress, mild reaction, and good heat resistance

Active Publication Date: 2020-06-05
山西蓝科途新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention selects aramid fiber as the organic material, aramid fiber is added in the form of aramid fiber polymer, does not contain processing aids such as adhesives, the interface stress between the obtained aramid fiber coating and the base film is small, the contact is good, and it is not easy Falling off, it is not easy to fall off even under long-term and high-strength use; the air permeability and pore size of the obtained aramid coating can be adjusted, widely used, low heat shrinkage, good heat resistance, and effectively improve the poor wettability of the base film to the electrolyte problems, improve the puncture strength of the base film, and improve the safety performance of lithium-ion battery separators

Method used

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  • A kind of high temperature resistant aramid fiber lithium ion battery composite diaphragm and preparation method thereof
  • A kind of high temperature resistant aramid fiber lithium ion battery composite diaphragm and preparation method thereof
  • A kind of high temperature resistant aramid fiber lithium ion battery composite diaphragm and preparation method thereof

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preparation example Construction

[0034] A preparation method of a high temperature resistant aramid fiber lithium ion battery composite diaphragm of the present invention includes the following steps: (1) preparation of aramid fiber casting solution: mixing aramid fiber, pore-forming agent, inorganic ceramic particles and organic solvent, At 50-80°C, stir to completely dissolve the aramid fiber and the pore-forming agent to obtain a casting solution; (2) Degassing: defoaming the casting solution obtained in step (1) at 50-80°C for 5-60min , until there are no bubbles; (3) Non-solvent-induced phase inversion method film formation: take the base film, apply a layer of deaerated casting liquid on the base film, stay for 5-60s, and place it in a solidification bath for solidification. The coagulation bath is a solvent and non-solvent coagulation bath or a steam coagulation bath. After coagulation for 1-10 minutes, take the base film with aramid fiber, soak it in water or overflow with tap water for 10-60 minutes, ...

Embodiment 1

[0038] Mix 5g of aramid fiber, 1.25g of glycerin, 1.25g of polyvinylpyrrolidone, 0.25g of alumina particles (average particle size of 10nm), and 42.25g of DMAc, where the aramid fiber is taken from the aramid fiber polymer, wherein the aromatic fiber in the aramid fiber polymer is aromatic. The solid content of the fiber is 10%, and mechanical stirring is carried out in an oil bath at 50 ° C until the aramid fiber and the pore-forming agent are completely dissolved, and the casting liquid of the aramid fiber is obtained; after stopping the stirring, in the 50 ° C oil bath, defoaming 5min; flatly lay a 20 μm PE base film on a clean glass plate, the porosity of the PE base film is 30%, pour an appropriate amount of defoamed casting liquid on the PE base film, scrape the film with a wire rod, After staying in the air for 5s, slowly and uniformly immersed in a coagulation bath of DMAc and water at room temperature to form a film. After 1min, peel off the PE film with aramid, soak i...

Embodiment 2

[0041] Mix 4.54g of aramid fiber, 1g of acetone, 1.5g of polyvinylpyrrolidone, 0.5g of silica particles (average particle size of 30nm), and 42.46g of DMF, where the aramid fiber is taken from the aramid fiber polymer, which is in the aramid fiber polymer. The solid content of the aramid fiber is 22%, the aramid fiber is para-aramid fiber, and the molecular weight of the aramid fiber is 5000-10000Da. Mechanical stirring is performed in an oil bath at 60 ° C until the aramid fiber and the pore-forming agent are completely dissolved, and the aramid fiber is obtained. After stopping stirring, defoaming in an oil bath at 60°C for 10min; flatly lay a 20μm PE base film on a clean glass plate, the PE base film has a porosity of 30%, using dip-coated After 3 minutes, peel off the PE film with aramid fiber, soak it in water for 20 minutes, and then take it out; at 60 ℃ oven, after drying for 45min, take out.

[0042] The lithium-ion battery composite separator in this embodiment is pr...

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Abstract

The invention discloses a high-temperature-resistant aramid lithium-ion battery composite diaphragm and a preparation method thereof, belonging to the technical field of lithium-ion battery materials. The invention includes a base film and a coating coated on one side or both sides of the base film. The coating is an aramid fiber coating, and the aramid fiber coating is prepared from the following raw materials in weight percentage: aramid fiber 1-6% , pore-forming agent 5-12%, inorganic ceramic particles 0.5-5%, organic solvent 77-93.5%; aramid fiber is taken from aramid fiber polymer, and the aramid fiber content in the aramid fiber polymer is calculated as 10% by weight -30%. The coating of the present invention has good interface adhesion with the base film, the coating is not easy to fall off under long-term and high-strength use conditions, the air permeability and pore size can be adjusted, and the heat resistance, electrolyte wettability and puncture strength have been effectively improved , improving the safety performance of the lithium-ion battery diaphragm; the invention adopts a non-solvent-induced phase conversion method to form a gel film, the process is simple and controllable, and it is easy to batch and continuous production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a high temperature resistant aramid lithium ion battery composite diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile electronic devices and power devices due to their high energy density and long cycle life. However, the frequent safety accidents of lithium-ion batteries have attracted widespread attention. Among them, the separator, as one of the important components of lithium-ion batteries, can provide lithium-ion transmission channels, and prevent short-circuits in the contacts between positive and negative electrodes, which has a very important impact on the safety of lithium-ion batteries. Development has higher requirements on the performance of the diaphragm. [0003] Polyolefin separators are currently the most widely used separators for lithium ion batteries. However, polyolefi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/449H01M50/457H01M50/491
CPCH01M10/0525H01M50/449H01M50/491H01M50/457Y02E60/10
Inventor 苗晶公言飞陈琪许志浩战鹏志李丹李琪杨波陈继朝郅立鹏
Owner 山西蓝科途新材料科技有限公司
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