Battery composite diaphragm, preparation method and application thereof

A composite diaphragm and battery technology, which is applied in the field of new energy batteries, can solve the problems of liquid absorption, poor liquid retention capacity, and low mechanical properties of the composite diaphragm, and achieve the effects of good liquid absorption, strong flame retardancy, and good thermal stability

Active Publication Date: 2021-01-22
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology coats the polytetrafluoroethylene coating on the surface of the polyolefin substrate diaphragm. Although the heat resistance and flame retardancy of the diaphragm are improved, the mechanical properties of the composite diaphragm are low, and the liquid absorption and liquid retention capabilities are poor.

Method used

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  • Battery composite diaphragm, preparation method and application thereof
  • Battery composite diaphragm, preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0065] This embodiment provides a battery composite diaphragm, the preparation method of which is as follows:

[0066] (1) Mix PVDF Solef5130 and PVDF HSV900 with a mass ratio of 1:5 and N-methylpyrrolidone, heat in an oven at 55°C for 0.5h, and stir at 600rpm for 1h to obtain a solid content of 6%. PVDF glue;

[0067] (2) Under the rotating speed of 800rpm, Al with an average particle diameter D50 of 0.75 μm 2 o 3 Particles are added to the glue solution obtained in step (1), and after the addition is completed, stir for 4 hours at a speed of 1800rpm to obtain a slurry with a solid content of 24%, wherein Al 2 o 3 The mass ratio of particles to PVDF is 5:1, Al 2 o 3 The feeding rate of particles is 2g / min;

[0068] (3) After the slurry obtained in step (2) was left to stand for 8 hours, after cooling and defoaming, the slurry was coated on a glass plate with a thickness of 250 μm by a scraper, and placed in an oven at 50 ° C. After drying, it was soaked with ethanol an...

Embodiment 2

[0070] This embodiment provides a battery composite diaphragm, the preparation method of which is as follows:

[0071] (1) Mix PVDF Solef5130 and PVDF HSV900 with a mass ratio of 4:1 and N-methylpyrrolidone, heat in an oven at 60°C for 0.5h, and stir at 750rpm for 1h to obtain a solid content of 9%. PVDF glue;

[0072] (2) Under the rotating speed of 900rpm, Al with an average particle size D50 of 0.2 μm 2 o 3 Particles are added to the glue solution obtained in step (1). After the addition is completed, stir at a speed of 2500rpm for 4h to obtain a slurry with a solid content of 36%, wherein Al 2 o 3 The mass ratio of particles to PVDF is 3:1, Al 2 o 3 The feeding rate of particles is 3g / min;

[0073] (3) After the slurry obtained in step (2) was left to stand for 12 hours, after cooling and defoaming, the slurry was coated on a PET film with a thickness of 150 μm by a scraper, and placed in an oven at 70°C. After drying, tear off the mold directly to obtain a composit...

Embodiment 3

[0075] This embodiment provides a battery composite diaphragm, the preparation method of which is as follows:

[0076] (1) Mix PVDF Solef5130 and PVDF HSV900 with a mass ratio of 1:1 and N-methylpyrrolidone, heat in an oven at 60°C for 0.7h, and stir at 700rpm for 1h to obtain a solid content of 8%. PVDF glue;

[0077] (2) Under the rotating speed of 1000rpm, the average particle diameter D50 is 3μm Al 2 o 3 Particles are added to the glue solution obtained in step (1). After the addition is completed, stir at a speed of 1500rpm for 6h to obtain a slurry with a solid content of 31%, wherein Al 2 o 3 The mass ratio of particles to PVDF is 5:1, Al 2 o 3 The feeding rate of particles is 2.5g / min;

[0078] (3) After the slurry obtained in step (2) was left to stand for 10 hours, after cooling and defoaming, the slurry was coated on a glass plate with a thickness of 200 μm by a scraper, placed in an oven at 60 ° C, After drying, it was soaked with ethanol and released from t...

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Abstract

The invention provides a battery composite diaphragm, a preparation method and application thereof. The composite diaphragm has a three-dimensional porous structure and comprises a polymer and inorganic ceramic particles dispersed in the polymer, wherein the mass ratio of the polymer to the inorganic ceramic particles is 1:2-1:6. The preparation method of the composite diaphragm comprises the following steps: (1) mixing a polymer with a solvent to obtain a polymer glue solution; (2) mixing the glue solution obtained in the step (1), inorganic ceramic particles and optionally beta-cyclodextrinto obtain slurry; and (3) coating a base material with the slurry obtained in the step (2), drying, and demolding to obtain the composite diaphragm. The composite diaphragm provided by the invention not only has good thermal stability and flame retardance, but also has good liquid absorption and liquid retention capabilities.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a battery composite diaphragm and its preparation method and application. Background technique [0002] In the battery structure, the separator is one of the key inner components. The separator is located between the positive and negative electrodes of the battery and has electronic insulation. It can separate the positive and negative electrodes of the battery and prevent the short circuit caused by the contact between the two electrodes. The separator has a certain pore size and porosity, so that the battery has low resistance and Higher ionic conductivity, and the separator should have good wettability to the electrolyte and excellent liquid absorption and moisture retention capabilities. The performance of the battery separator determines the key characteristics such as the capacity, cycle performance, and charge-discharge current density of the lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/451H01M50/417H01M50/426H01M50/403H01M10/0525H01M10/056H01M10/42
CPCH01M10/056H01M10/0525H01M10/4235Y02E60/10
Inventor 石程王国光王占洲蒋易晟
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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