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Preparation method of a lithium-ion battery blended microporous diaphragm

A technology for lithium-ion batteries and microporous diaphragms, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., and can solve the problem of low electrochemical and safety performance of batteries and uneven pore size distribution of battery diaphragms and other issues, to achieve the effect of reducing polarization, low production cost, and short production process

Active Publication Date: 2020-10-30
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a preparation method of a lithium-ion battery blended microporous diaphragm, which solves the problems of uneven pore size distribution of the battery diaphragm and low battery electrochemical and safety performance in the prior art

Method used

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  • Preparation method of a lithium-ion battery blended microporous diaphragm
  • Preparation method of a lithium-ion battery blended microporous diaphragm
  • Preparation method of a lithium-ion battery blended microporous diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Step 1. Weigh 12% of the membrane material, 4% of glacial acetic acid, 6% of polyvinylpyrrolidone, and 78% of N-methylpyrrolidone according to the mass percentage, and add them to the solvent tank to prepare a mixed solution; wherein, the membrane material The mass ratio of polyvinylidene fluoride to polyethylene is 15:85;

[0035] Step 2. Stir the mixed solution prepared in step 1 under the conditions of 150°C and 300r / min to make it a homogeneous solution, and place it in an electric heating mold at a constant temperature for 12 hours until the membrane material is completely dissolved and there are no bubbles. Prepare casting solution;

[0036] Step 3. Place the cleaned glass plate in an environment of 150°C, and put the casting solution prepared in step 2 close to the glass plate until the casting solution slowly flows to one end of the glass plate, making it lined up , and then use a glass scraper to slowly push the discharged casting solution to the other end of ...

Embodiment 2

[0041]Step 1. Weigh 12% of the membrane material, 4% of glacial acetic acid, 6% of polyvinylpyrrolidone, and 78% of N-methylpyrrolidone according to the mass percentage, and add them to the solvent tank to prepare a mixed solution; wherein, the membrane material The mass ratio of polyvinylidene fluoride to polyethylene is 25:75;

[0042] Step 2. Stir the mixed solution obtained in Step 1 under the conditions of 150°C and 300r / min to make it a homogeneous solution, and place it in an electric heating mold for 12 hours at a constant temperature until the membrane material is completely dissolved and there are no bubbles. to obtain the casting solution;

[0043] Step 3. Place the cleaned glass plate in an environment of 150°C, and place the casting solution prepared in step 2 close to the glass plate until the casting solution slowly flows to one end of the glass plate, making it lined up , and then use a glass scraper to slowly push the discharged casting solution to the other ...

Embodiment 3

[0048] Step 1. Weigh 12% of the membrane material, 4% of glacial acetic acid, 6% of polyvinylpyrrolidone, and 78% of N-methylpyrrolidone according to the mass percentage, and add them to the solvent tank to prepare a mixed solution; wherein, the membrane material The mass ratio of polyvinylidene fluoride to polyethylene is 30:70;

[0049] Step 2. Stir the mixed solution prepared in step 1 under the conditions of 150°C and 300r / min to make it a homogeneous solution, and place it in an electric heating mold at a constant temperature for defoaming for 12 hours until the membrane material is completely dissolved and there are no bubbles , to prepare the casting solution;

[0050] Step 3. Place the cleaned glass plate in an environment of 150°C, and put the casting solution close to the glass plate until the casting solution slowly spreads to one end of the glass plate so that it is lined up, and then use a glass scraper Slowly push the drained casting solution to the other end of...

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Abstract

The invention discloses a preparation method of a lithium-ion battery blended microporous membrane. The method is realized through the following steps: step 1, weighing the membrane material, glacial acetic acid, polyvinylpyrrolidone, and a diluent and adding it to a material melting tank to prepare Obtain a mixed solution; Step 2, stir the above-mentioned mixed solution to make it a homogeneous solution, leave it to stand for degassing, and obtain a casting solution; Step 3, scrape and coat the above-mentioned casting solution to form a film, and obtain a polymer film intermediate; Step 4, putting the above-mentioned polymer film intermediate into a sodium carbonate solution for quenching, soaking to obtain a quenched film; step 5, extracting the above-mentioned quenched film by ethanol to obtain a wet film; step 6, placing The wet film is dried and heat-set by clamping mold to obtain the target object. The diaphragm obtained in the present invention has the following characteristics: 1) the pore size distribution is more uniform; 2) the electrical conductivity is improved; 4) the internal resistance of the battery is reduced and the polarization is reduced; 5) the preparation process is simple, the production process is short, and the production cost is lower.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a preparation method of a lithium-ion battery blended microporous diaphragm. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, and no memory effect. They are also safe, environmentally friendly, reliable, and capable of fast charging and discharging. Therefore, they have become a hot spot in technical research in recent years. The separator is a key component of lithium-ion batteries, which prevents short-circuiting of the positive and negative electrodes and provides ion transport channels. The current commercial separators have many shortcomings, such as low porosity, poor mechanical strength, and low electrolyte absorption rate, which affect the safety of lithium batteries. In addition, the structure and performance of the membrane also have a great impact on the performance of the battery. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/491
CPCH01M50/409H01M50/403Y02E60/10
Inventor 刘利萍詹世英马美品李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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