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Separator of organic/inorganic composite porous coating and preparation method thereof

A porous coating and inorganic composite technology, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problem of uneven dispersion of inorganic particles, easy falling off, and weak combination of inorganic particles and organic polymers and other issues to achieve the effect of enhancing security, improving security, and improving security

Active Publication Date: 2015-12-02
扬州市永佳车辆配件有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention overcomes the disadvantages of the prior art that the inorganic particles in the surface coating of the diaphragm are not uniformly dispersed, and the combination of the inorganic particles and the organic polymer is not firm and easy to fall off, and provides a diaphragm of an organic / inorganic composite porous coating and its preparation The method improves the performance of the separator by introducing a porous coating with inorganic particles and improves the safety of the separator by solving the problem of deintercalation of inorganic particles in the porous coating formed on the porous substrate, thereby enhancing the safety of lithium-ion batteries in use

Method used

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  • Separator of organic/inorganic composite porous coating and preparation method thereof

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Experimental program
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Embodiment 1

[0043] (1) According to the existing industrial technology, a polypropylene microporous film was prepared by uniaxial stretching process, with a film thickness of 28.8 μm, an air permeability of 360 (Gurley value; unit: s), a porosity of 60%, and an average pore diameter range of 100nm. Inorganic nano-SiO 2 It is a commercially available inorganic nanoparticle with a diameter ranging from 45 to 55 nm.

[0044] Synthesis of binder polymer: Take 50mL acetone, 0.5gBPO and 10.33gMMA respectively into a 100mL three-neck flask, react at 65°C for 4 hours, then precipitate the polymer with methanol, and put it in a fume hood for about 2 hours, and then put it into a vacuum oven at 70°C to dry for 8-10 hours to obtain the organic polymer PMMA. Seal the 100mL reaction bottle with a branch pipe equipped with a stirring bar with a rubber stopper, pump air from the branch pipe to the baking bottle, and fill the reaction bottle with nitrogen after cooling to room temperature. Repeat the ...

Embodiment 2

[0048] Only change the binder polymer molecular weight of preparation, other conditions are with embodiment 1, and coating solution is coated on another surface of embodiment 1 gained composite coating diaphragm, and coating thickness is the same as the porous coating that another surface is coated with The thickness is the same, and vacuum drying is carried out to obtain a polypropylene separator with a double-sided composite coating. The performance test results are shown in Table 1.

Embodiment 3

[0050] According to the existing industrial technology, a high-density polyethylene microporous membrane is prepared by a uniaxial stretching process. The film thickness is 28.8 μm, and the air permeability is 360 (Gurley). The porosity of the polyethylene microporous membrane is 48%, and the average The pore size is 55nm. Inorganic nano-MgO is a commercially available inorganic nano-particle with a diameter of about 50 nm.

[0051] Synthesis of organic polymers: Take 50mL acetone, 0.5gBPO and 10.33gMMA respectively into a 100mL three-neck flask, react at 65°C for 4 hours, then precipitate the polymer with methanol, and put it in a fume hood for about 2 hours. Then put it into a vacuum oven at 70°C and dry for 8-10 hours to obtain the organic polymer PMMA.

[0052] The organic polymer PMMA was dissolved in dimethyl sulfoxide to prepare a binder polymer solution with a solid content of 35%. Inorganic nanometer MgO is vigorously stirred and dispersed therein to form a coating ...

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Abstract

The invention aims to overcome the defects of unstable combining between an inorganic particle and an organic polymer, and easiness in falling in the prior art, and provides a diaphragm of an organic / inorganic composite porous coating, and a preparation method of the diaphragm. The diaphragm comprises a polyolefin microporous membrane and a microporous coating formed on at least one surface of the polyolefin microporous membrane. The preparation method of the diaphragm comprises the following steps: (1) polymerizing binder polymers with different molecular weights by adopting a solution polymerization method; (2) dissolving the binder polymers prepared in the step (1) into an organic solvent to prepare a polymer solution, and uniformly dispersing inorganic nano-particles in the polymer solution, so as to prepare a coating solution; (3) coating the coating solution prepared in the step (2) on the at least one surface of the polyolefin microporous membrane prepared through a one-way stretching process, rapidly performing vacuum drying, forming a coating with a porous structure on the surface of the polyolefin microporous membrane, so as to prepare the diaphragm of the organic / inorganic composite porous coating. According to the diaphragm and the preparation method, the embedding failing problem of the inorganic nano-particles is solved, and thus the use safety of a lithium ion battery is enhanced.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, in particular to the diaphragm of the lithium-ion secondary battery. Background technique [0002] Lithium-ion battery is a new chemical power system developed rapidly in recent years. Compared with traditional nickel-cadmium or nickel-hydrogen batteries, it has high specific energy, long cycle life, no memory effect, safety and pollution-free, and fast charging and discharging. It is one of the hot spots in the research and development of new power supply technology. It can be widely used in portable electronic products such as rechargeable batteries required for mobile phones, notebook computers, video recorders, etc., and can also be used as a power source for electric vehicles and hybrid vehicles. A common lithium-ion secondary battery consists of positive / negative electrode materials, electrolyte, separator, and battery casing packaging materials. The separator is an importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16B32B27/32B32B27/06H01M50/403H01M50/446H01M50/449H01M50/489
CPCY02E60/10
Inventor 蒋姗邓秀玲李夏倩俞强丁永红张洪文
Owner 扬州市永佳车辆配件有限公司
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