A kind of battery composite separator and its preparation method and application

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, good dispersion, and strong flame retardancy

Active Publication Date: 2022-07-12
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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  • A kind of battery composite separator and its preparation method and application
  • A kind of battery composite separator and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The present embodiment provides a battery composite separator, and its preparation method is as follows:

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

[0067] (2) At a rotational speed of 800 rpm, Al with an average particle size D50 of 0.75 μm 2 O 3 The particles are added to the glue solution obtained in step (1), and after the addition is completed, stirring is carried out at a speed of 1800 rpm for 4 hours 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 allowed to stand for 8 hours, after cooling and defoaming, the slurry was coated on a glass plate with a thickness of 250 μm with a blade coater, placed in an oven...

Embodiment 2

[0070] The present embodiment provides a battery composite separator, and its preparation method is as follows:

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

[0072] (2) Under the rotation speed of 900 rpm, the average particle size D50 of Al with an average particle size of 0.2 μm was 2 O 3 The particles are added to the glue solution obtained in step (1), and after the addition is completed, the mixture is stirred for 4 hours at a rotational speed of 2500 rpm 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 speed of the particles is 3g / min;

[0073] (3) After the slurry obtained in step (2) was allowed to stand for 12 hours, after cooling and defoaming, the slurry was coated on the PET film with a thickness of 150 μm with ...

Embodiment 3

[0075] The present embodiment provides a battery composite separator, and its preparation method is as follows:

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

[0077] (2) At a rotational speed of 1000 rpm, Al with an average particle size D50 of 3 μm was 2 O 3 The particles are added to the glue solution obtained in step (1), and after the addition is completed, stirring is carried out at a rotating speed of 1500 rpm for 6 hours 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 allowed to stand for 10 hours, after cooling and defoaming, the slurry was coated on a glass plate with a thickness of 200 μm with a blade coater, placed in an oven ...

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Abstract

The invention provides a battery composite separator and a preparation method and application thereof. The composite separator has a three-dimensional porous structure, and includes 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 includes the following steps: (1) mixing a polymer and a solvent to obtain a polymer glue; (2) mixing the glue, inorganic ceramic particles and optionally β-cyclopaste obtained in step (1) Fine mixing to obtain a slurry; (3) coating the slurry obtained in step (2) on a substrate, drying and demolding, to obtain the composite diaphragm. The composite diaphragm provided by the invention not only has good thermal stability and flame retardancy, but also has good liquid absorption and liquid retention capacity.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a battery composite separator and a preparation method and application thereof. Background technique [0002] In the battery structure, the separator is one of the key inner layer components. The separator is located between the positive and negative electrodes of the battery, and has electronic insulation, which can separate the positive and negative electrodes of the battery to prevent the problem of short circuit due to contact between the two electrodes, and the separator has a certain pore size and porosity, so that the battery has a lower resistance and High ionic conductivity, and the separator should have good wettability to the electrolyte and excellent liquid absorption and moisturizing capabilities. The performance of the battery separator determines the key characteristics of the lithium-ion battery, such as capacity, cycle performance, and charge-discha...

Claims

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Application Information

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Patent Type & Authority Patents(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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