Polyimide coating modified polyolefin composite diaphragm and preparation method thereof

A technology of polyolefin membrane and polyimide coating, applied in coating, electrochemical generator, electrical components, etc., can solve the problems of little improvement in thermal dimensional stability and low temperature resistance of organic polymers, etc. To achieve the effect of improving thermal stability, good wettability and increasing integrity

Pending Publication Date: 2022-01-25
北京宇程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, patent CN104993089 reports a lithium-ion battery separator coated with aramid fiber and its preparation method. Aramid fiber slurry is obtained by uniformly mixing aramid fiber solution, emulsifier solution, and polymer adhesive, and then the obtained polymer glue Coating the body fluid on the su

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  • Polyimide coating modified polyolefin composite diaphragm and preparation method thereof
  • Polyimide coating modified polyolefin composite diaphragm and preparation method thereof
  • Polyimide coating modified polyolefin composite diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Preparation of PMDA / ODA system polyimide with fiber / microsphere composite morphology: monomer pyromellitic dianhydride (PMDA) and monomer 4,4'-diaminodiphenyl ether (ODA) in a molar ratio of 1 : 1 weighed, reacted in the solvent N, N-dimethylformamide (DMF) for 10 h under ice-water bath conditions at 0°C to obtain a clear and transparent polyamic acid solution with a mass concentration of 12%, and the electric field strength was 1kV / cm Electrospinning in an electric field, and the polyamic acid film is collected by a stainless steel drum, and then the polyamic acid film is peeled off from the roller, and placed in a high-temperature furnace for imidization treatment. The heating program is: 5°C / min The heating rate is raised from room temperature to 300°C, stay at 300°C for 1 hour, turn on the furnace, and cool down to room temperature naturally

[0035]Prepare the coating slurry: configure the coating slurry with the polymer binder, water and ethanol mixed solvent, and...

Embodiment 2

[0041] Preparation of PMDA / MDA system polyimide with fiber / microsphere composite morphology: Weigh monomer pyromellitic dianhydride (PMDA) and monomer diaminodiphenylmethane (MDA) in a molar ratio of 1:1, Reaction in the solvent N,N-dimethylformamide (DMF) for 10 hours under ice-water bath conditions at 0°C to obtain a clear and transparent polyamic acid solution with a mass concentration of 12%, and electrospinning in an electric field with an electric field strength of 1kV / cm The polyamic acid film is collected by a stainless steel drum, and then the polyamic acid film is peeled off from the roller and placed in a high-temperature furnace for imidization treatment. The heating program is: from room temperature to 5°C / min. Raise to 300°C, stay at 300°C for 1 hour, turn on the furnace, and cool down to room temperature naturally

[0042] Prepare the coating slurry: configure the coating slurry with the polymer binder, water and ethanol mixed solvent, and polyimide film accordi...

Embodiment 3

[0048] Preparation of polyimide with fiber / microsphere composite morphology PMDA / PDA system: Weigh monomer pyromellitic dianhydride (PMDA) and monomer p-phenylenediamine (PDA) in a molar ratio of 1:1, The solvent N,N-dimethylformamide (DMF) was reacted in an ice-water bath at 0°C for 10 hours to obtain a clear and transparent polyamic acid solution with a mass concentration of 12%, which was electrospun in an electric field with an electric field strength of 1kV / cm , collect the polyamic acid film through a stainless steel drum, then peel the polyamic acid film from the roller, and place it in a high-temperature furnace for imidization treatment. to 300°C, stay at 300°C for 1 hour, turn on the furnace, and cool down to room temperature naturally

[0049] Prepare the coating slurry: configure the coating slurry with the polymer binder, water and ethanol mixed solvent, and polyimide film according to the weight ratio of 1:79:20. Firstly, 0.8 g of polyimide film was weighed and ...

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Abstract

The invention discloses a polyimide coating modified polyolefin composite diaphragm and a preparation method thereof. The preparation method comprises the following steps: synthesizing a PAA solution with certain intrinsic viscosity through a two-step method, preparing a polyimide film with fiber/microsphere composite morphology by using an electrostatic spinning technology, preparing a polyimide dispersion liquid, adding a polymer adhesive into the polyimide dispersion liquid, stirring at a high speed by using a homogenizer to obtain a polyimide coating slurry, uniformly coating the surface of a polyolefin diaphragm with the polyimide coating slurry, and drying to obtain the polyimide coating modified polyolefin diaphragm with the fiber/microsphere composite morphology. According to the invention, the process is simple and easy to implement, the bonding strength between the polyimide coating and the polyolefin diaphragm layer is high, the thermal dimensional stability and electrolytic solution wettability of the diaphragm can be obviously improved, and the polyolefin diaphragm can play a role in hole closing at a high temperature besides the diaphragm function at a normal temperature, so that short circuit in the battery is prevented, and the safety of the battery is further improved.

Description

technical field [0001] The invention belongs to the technical field of polyolefin diaphragm coating modification, in particular to a polyimide-coated polyolefin diaphragm with fiber / microsphere composite morphology. Background technique [0002] Lithium-ion battery is a new type of green secondary battery, which was successfully developed in 1990. It has the advantages of high energy density, long cycle life, no memory effect, fast charging and discharging, and environmental protection, and has been widely used in 3C products. Lithium-ion batteries are mainly composed of positive / negative electrode materials, electrolytes and separators. Separators are an important part of lithium-ion batteries. Separate the positive and negative electrodes to prevent the battery from short-circuiting and allow the electrolyte ions to pass through freely. The separator plays an important role in improving the overall performance of the battery, and is called the "third electrode" of the b...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08J7/04C09D179/08H01M10/0525H01M50/403H01M50/417H01M50/423H01M50/449
CPCC08J7/0427H01M50/417H01M50/423H01M50/449H01M50/403H01M10/0525C08J2323/06C08J2479/08Y02E60/10
Inventor 贾南方王杰
Owner 北京宇程科技有限公司
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