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High-swelling-degree AFL, preparation method and high-swelling-degree AFL ceramic diaphragm

A technology of ceramic diaphragm and swelling degree, which is applied in the direction of electrical components, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of poor contact, affecting the service life of batteries, and small particle size, so as to reduce the change of size and avoid poor interface contact Effect

Active Publication Date: 2021-06-11
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium batteries need to be charged and discharged continuously during use, but with the increase in the number of charge and discharge of lithium batteries, especially soft packs and square lithium batteries, lithium batteries are constantly expanding and shrinking, resulting in lithium batteries There are gaps in the pole piece interface, making it poor contact and affecting the service life of the battery
[0003] The conventional solution is to apply a layer of adhesive on the separator to form a glue layer on the surface of the separator to bond the positive and negative electrodes, but the swelling degree of the traditional adhesive is generally low and the particle size is small , after entering the interior of the battery, the low-swellability adhesive continues to swell after contact with the electrolyte, causing the volume to increase, causing the pores of the porous separator to be blocked, affecting battery performance

Method used

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  • High-swelling-degree AFL, preparation method and high-swelling-degree AFL ceramic diaphragm
  • High-swelling-degree AFL, preparation method and high-swelling-degree AFL ceramic diaphragm
  • High-swelling-degree AFL, preparation method and high-swelling-degree AFL ceramic diaphragm

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preparation example Construction

[0025] Further, the present invention also provides a method for preparing AFL with high swelling degree, comprising the following steps: putting PMMA into electrolyte solution for soaking to obtain swollen PMMA; putting swollen PMMA into PAN solution for stirring to obtain PAN-coated PMMA; After drying the PAN-coated PMMA, AFL with high swelling degree was obtained.

[0026] Wherein, optionally, the PMMA may be, but not limited to, spherical PMMA with a molecular weight of 50,000-200,000.

[0027] Optionally, the temperature for soaking the PMMA in the electrolyte solution may be, but not limited to, 40-50° C., and the time may be, but not limited to, 24-72 hours, so as to fully swell the PMMA.

[0028] Optionally, the electrolyte solution may be but not limited to propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC) or dimethyl carbonate (DMC).

[0029] Optionally, the drying temperature of the PAN-coated PMMA may be, but not limited to, 40-50° C., so ...

Embodiment 1

[0043] Put 20kg of spherical PMMA with a molecular weight of 100,000 into diethyl carbonate and soak for 48h at 50°C to obtain swollen PMMA; put the swollen PMMA into 10kg of PAN solution with a solid content of 40% and stir to obtain a PAN package. Coated PMMA; After drying the PAN-coated PMMA at 45 °C, AFL with high swelling degree was obtained.

Embodiment 2

[0045]20kg of spherical PMMA with a molecular weight of 50,000 is put into diethyl carbonate and soaked for 72h at 45°C to obtain swollen PMMA; the swelled PMMA is put into 5kg of PAN solution with a solid content of 40% and stirred to obtain a PAN package. Coated PMMA; After drying the PAN-coated PMMA at 40 °C, AFL with high swelling degree was obtained.

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Abstract

The invention belongs to the technical field of diaphragms, and particularly relates to a high-swelling-degree AFL, a preparation method of the high-swelling-degree AFL and a high-swelling-degree AFL ceramic diaphragm. The high-swelling-degree AFL comprises PMMA and PAN, wherein the outer layer of the PMMA is coated with the PAN, and the swelling degree of the PMMA is not lower than 90%. According to the high-swelling-degree AFL, the outer layer of PMMA with the swelling degree not lower than 90% is wrapped with PAN, so that the inner layer PMMA keeps higher swelling degree, and the situation that when the high-swelling-degree AFL is used for a lithium battery, PMMA continues to swell, so that the size is increased, and the performance of the lithium battery is affected, is avoided.

Description

technical field [0001] The invention belongs to the technical field of diaphragms, and in particular relates to a high-swellability AFL, a preparation method, and a high-swellability AFL ceramic diaphragm. Background technique [0002] Lithium batteries need to be charged and discharged continuously during use, but with the increase in the number of charge and discharge of lithium batteries, especially soft packs and square lithium batteries, lithium batteries are constantly expanding and shrinking, resulting in lithium batteries There are gaps in the pole piece interface, making it poor contact and affecting the service life of the battery. [0003] The conventional solution is to apply a layer of adhesive on the separator to form a glue layer on the surface of the separator to bond the positive and negative electrodes, but the swelling degree of the traditional adhesive is generally low and the particle size is small , After entering the interior of the battery, the low-s...

Claims

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Application Information

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IPC IPC(8): H01M50/411H01M50/403H01M10/052
CPCH01M10/052Y02E60/10
Inventor 王成豪李正林翁星星陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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