Preparation process of lithium battery diaphragm

A lithium battery diaphragm and a preparation process technology, applied in the field of lithium battery diaphragm preparation technology, can solve problems such as short circuit, non-permanent electronic conductivity of the diaphragm, large pore size, etc., achieve uniform pore size distribution, long-lasting ionic conductivity, and improve flexibility Effect

Inactive Publication Date: 2020-09-08
淮北市吉耐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

In this application, the polyolefin diaphragm formed by compounding PP and PE has a certain temperature resistance, but its pore size is large, and the particles in the positive and negative materials are easy to enter the interior of the diaphragm under the action of extrusion, resulting in micro-short circuit phenomenon. , and the electronic conductivity of the separator is not persistent

Method used

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  • Preparation process of lithium battery diaphragm

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preparation example Construction

[0023] A preparation process of a lithium battery diaphragm includes the following steps:

[0024] The first step is to dissolve the modified polyimide in N-methylpyrrolidone, fully stir to dissolve, and use a vacuum pump to vacuum and de-air bubbles to obtain a casting solution with a modified polyimide mass fraction of 20-25% ,Store the casting solution at 2-3℃;

[0025] In the second step, electrospinning the casting solution, spinning at a spinning voltage of -4~22kV, a solution advance rate of 10mL / h, room temperature and humidity below 50%, to obtain a prefabricated fiber membrane;

[0026] The third step is to place the nanofiber membrane in a high-temperature oven, and raise the temperature to 300°C at a rate of 3.5°C / min for 8-10 minutes. After the reaction, stop heating and take it out after the temperature drops to room temperature to obtain a fiber membrane;

[0027] The fourth step, put the fiber membrane on the coating machine, use a 4μm gravure roll to coat the boehmite...

Embodiment 1

[0037] A preparation process of a lithium battery diaphragm includes the following steps:

[0038] The first step is to dissolve the modified polyimide in N-methylpyrrolidone, fully stir to dissolve, and use a vacuum pump to vacuum and degas bubbles to obtain a casting solution with a modified polyimide mass fraction of 20%. The casting liquid should be stored at 2-3℃;

[0039] In the second step, electrospinning the casting solution, spinning at a spinning voltage of -4~22kV, a solution advance rate of 10mL / h, room temperature and humidity below 50%, to obtain a prefabricated fiber membrane;

[0040] The third step is to place the nanofiber membrane in a high-temperature oven, and raise the temperature to 300°C at a rate of 3.5°C / min for 8 minutes. After the reaction, stop heating and take it out after the temperature drops to room temperature to obtain a fiber membrane;

[0041] The fourth step is to put the fiber membrane on the coating machine, use a 4μm gravure roll to coat the b...

Embodiment 2

[0043] A preparation process of a lithium battery diaphragm includes the following steps:

[0044] The first step is to dissolve the modified polyimide in N-methylpyrrolidone, fully stir to dissolve, and use a vacuum pump to vacuum and degas bubbles to obtain a casting solution with a modified polyimide mass fraction of 25%. The casting liquid should be stored at 2-3℃;

[0045] In the second step, electrospinning the casting solution, spinning at a spinning voltage of -4~22kV, a solution advance rate of 10mL / h, room temperature and humidity below 50%, to obtain a prefabricated fiber membrane;

[0046] The third step is to place the nanofiber membrane in a high-temperature oven, and raise the temperature to 300°C at a rate of 3.5°C / min for 10 minutes. After the reaction, stop heating and take it out after the temperature drops to room temperature to obtain a fiber membrane;

[0047] The fourth step is to place the fiber membrane on the coating machine, use a 4μm gravure roll to coat th...

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Abstract

The invention discloses a preparation process of a lithium battery diaphragm. The preparation process comprises the following steps of: 1, preparing a membrane casting solution; 2, carrying out electrostatic spinning on the membrane casting solution to obtain a prefabricated fiber membrane; 3, performing baking at high temperature; and 4, coating the upper surface and the lower surface of the fiber membrane with a ceramic material. According to the invention, polyimide is modified, a soft chain segment can be introduced into a polyimide molecular chain, the flexibility of the polyimide molecular chain is improved, the flexibility of the fiber membrane is improved, also polyethylene glycol is combined with a membrane matrix in a chemical bonding mode, the binding force is high, the solventresistance and the high temperature resistance of polyethylene glycol are improved, and the diaphragm has efficient and lasting ionic conductivity; besides, the surface of the polyimide fiber membraneis coated with the ceramic material, so that the pore diameter of the diaphragm can be effectively reduced, the average pore diameter of the diaphragm is about 0.1microm, the pore diameter distribution is uniform, and the use performance of the lithium battery diaphragm is improved.

Description

Technical field [0001] The invention belongs to the field of lithium battery production, and specifically relates to a preparation process of a lithium battery diaphragm. Background technique [0002] Lithium batteries are mainly used for the consumption of lithium batteries, power batteries and industrial energy storage, and occupy an important part of the entire new energy industry. The technical application of lithium batteries in energy storage mainly revolves around grid energy storage, base station backup power, home optical storage systems, electric vehicle charging stations and other fields. It has high specific energy and energy density, low self-discharge rate, no memory effect, and The environment is pollution-free, and its performance is better than other energy storage battery types. As one of the key components of the inner layer of the lithium battery, the performance of the diaphragm determines the interface structure and internal resistance of the battery, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/423H01M50/434H01M50/44H01M50/449H01M50/489H01M50/497
CPCH01M10/052Y02E60/10
Inventor 王付重黄香钰王金阁陈海同
Owner 淮北市吉耐新材料科技有限公司
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