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Preparation method of battery diaphragm

A battery separator and electrospinning technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as temperature rise, peeling, and different physical properties between layers, and achieve the effect of avoiding delamination

Active Publication Date: 2015-03-25
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of the above-mentioned organic-inorganic battery separator is ABA type, and it is still possible to peel off due to the difference in physical properties between the layers, and even when the battery is used abnormally, the temperature rises sharply, causing danger.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh raw materials according to PMMA:DMAC=0.05:1 (mass ratio, the same below), press Al 2 o 3 :PMMA=(0~20):1Weigh Al with a particle size of 1nm 2 o 3 40 parts, and 40 parts nano Al 2 o 3 The amount is evenly distributed in this range.

[0027] PMMA was added to DMAC, followed by one part of nano-Al 2 o 3 Add it, then the above solution was vigorously stirred in a water bath at 40°C for 8 hours to obtain PMMA completely dissolved, nano-Al 2 o 3Uniformly dispersed spinning solution. Inject the spinning liquid into the syringe, the inner diameter of the spinning needle of the syringe is 0.5mm, the voltage of the electrospinning machine is set to 1kV, the distance between the needle and the receiving device is 1cm, the spinning temperature is 90°C, and the spinning flow rate is 0.02 ml / h, electrospinning to obtain a primary nanofiber membrane with a thickness of 1 μm, and dry the primary nanofiber membrane at 90° C. for 0.5 h to obtain an organic-inorganic compos...

Embodiment 2

[0030] Weigh the raw materials according to PAN:DMF=0.1:1 (mass ratio, the same below), and press SiO 2 :PAN=(0~30):1 Weigh SiO with a particle size of 10nm 2 15 parts, and 15 parts nano-SiO 2 The amount is evenly distributed in this range.

[0031] One of the nano-SiO 2 Added to DMF, then PAN was also added, and then the above solution was stirred in a water bath at 60°C for 6 hours to obtain complete dissolution of PAN and nano-SiO 2 Uniformly dispersed spinning solution. Inject the spinning liquid into the syringe, the inner diameter of the spinning needle of the syringe is 0.1mm, the voltage of the electrospinning machine is set to 10kV, the distance between the needle and the receiving device is 20cm, the spinning temperature is 60°C, and the spinning flow rate is 2ml / h, electrospinning to obtain a primary nanofiber membrane with a thickness of 2 μm, and dry the primary nanofiber membrane at 80° C. for 0.5 h to obtain an organic-inorganic composite nanofiber membran...

Embodiment 3

[0034] Weigh raw materials according to PVDF:DMF=0.4:1 (mass ratio, the same below), press ZrO 2 :PVDF=(0~3):1 Weigh ZrO with a particle size of 80nm 2 15 parts, and 15 parts nano ZrO 2 The amount is evenly distributed in this range.

[0035] Add PVDF to DMF while stirring in a water bath at 80°C, stir for 3 hours, and then add one part of nano-ZrO 2 Add it while stirring, and continue to stir for 2 hours to obtain PVDF completely dissolved, nano ZrO 2 Uniformly dispersed spinning solution. Inject the spinning liquid into the syringe, the inner diameter of the spinning needle of the syringe is 1.5mm, the voltage of the electrospinning machine is set to 40kV, the distance between the needle and the receiving device is 50cm, the spinning temperature is 30°C, and the spinning flow rate is 5ml / h, electrospinning to obtain a primary nanofiber membrane with a thickness of 4 μm, and dry the primary nanofiber membrane at 30° C. for 4 h to obtain an organic-inorganic composite nan...

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PUM

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Abstract

The invention discloses a preparation method of a battery diaphragm. The preparation method comprises the following steps: adding inorganic nano powder and macromolecular polymer into organic solvent, mechanically stirring the mixture to completely dissolve the macromolecular polymer, and uniformly dispersing the inorganic nano powder to obtain a spinning solution; injecting the spinning solution into an electrostatic spinning machine, carrying out the electronic spinning to obtain a primary nano fiber membrane, and drying the primary nano fiber membrane to obtain an inorganic composite nano fiber membrane; preparing the spinning solution by changing the mass ratio of the inorganic nano powder to the macromolecular polymer, carrying out the electrostatic spinning, and drying to prepare an organic-inorganic composite nano fiber membrane in different mass ratios, cutting the organic-inorganic composite nano fiber membrane, and the laminating the cut membranes in a sequence from a high mass ratio to a lower mass ratio of the inorganic nano powder to the macromolecular polymer to form a multilayer fiber membrane; placing the laminated fiber membrane into a mold with the diameter identical to the membrane, and pressing the fiber membrane by a pressure machine to obtain the battery diaphragm.

Description

technical field [0001] The invention relates to a method for preparing a diaphragm in the field of lithium ion batteries. Background technique [0002] With the development of the economy, people's demand for energy is gradually increasing. However, the use of coal, natural gas, oil and other resources has brought serious environmental problems to people. In recent years, people have focused their research on energy sources such as solar energy, wind energy, and geothermal energy. How to store these scattered energy sources is the key to their efficient use. Lithium-ion battery as a power storage device ensures the continuity of energy supply, and also has the advantages of light weight, long cycle life, and no memory effect. [0003] Separators are key components of lithium-ion batteries. Separators for lithium-ion batteries are mainly polyolefin materials, including polyethylene, polypropylene and their three-layer composites. Polyolefin membrane materials have the adv...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/406H01M50/443H01M50/446H01M50/449
CPCH01M10/0525H01M50/411H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 张亚彬肖长发曹旭苏梦玲徐佳伟
Owner TIANJIN POLYTECHNIC UNIV