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Method for preparing multilayer composite membrane for secondary battery by using electrostatic spinning coating method

A secondary battery and multi-layer composite technology, which is applied to battery components, chemical instruments and methods, circuits, etc., can solve problems such as plugging holes, and achieve the effects of simple operation, improved market application prospects, and convenient industrialization

Active Publication Date: 2015-03-04
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the existing non-woven fabric, or glass fiber, or polyolefin separator, the organic-inorganic composite layer coated by electrospinning technology can improve the safety of the separator to the battery and increase the wetting of the electrolyte. Wetness; combined with a pore-forming technology can solve the problem of pore blocking caused by coating, and further improve the ability of the separator to transport lithium ions

Method used

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  • Method for preparing multilayer composite membrane for secondary battery by using electrostatic spinning coating method
  • Method for preparing multilayer composite membrane for secondary battery by using electrostatic spinning coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 PP / (PVDF-co-HFP / ZrO 2 ) composite diaphragm (with DBP)

[0040] 5.0g PVDF-co-HFP (Mw=6×10 5 ) was dissolved in 37 g of acetone and dissolved using a ball mill for 8 hours to form a solution. Add 1.0g of ZrO treated with 1% titanate coupling agent 2 (Particle size range 50-400nm) and 0.5g DBP in PVDF-co-HFP / acetone solution and mixed in a high-speed mixer at 1000rpm for 10 minutes, and then the mixed solution was coated on the PP separator by electrospinning technology ( 2400) surface, after drying the membrane and then extracting the DBP with isopropanol, the final drying forms PP / (PVDF-co-HFP / ZrO 2 ) Composite diaphragm.

[0041] Diaphragm wettability test: the dried 2400 diaphragm and PP / (PVDF-co-HFP / ZrO prepared by the present invention 2 ) The composite diaphragm is laid flat on a horizontal surface in the glove box, and conventional carbonate electrolyte (1MLiPF 6 , EC / EMC=3 / 7 (w / w)) on the two kinds of diaphragms, observing the state of the ...

Embodiment 2

[0042] Embodiment 2 (PP / PP) / (PVDF / SiO 2 ) composite diaphragm (with DBP)

[0043] Put 5.0g PVDF (Mw=2×10 6 ) was dissolved in 40 g NMP and dissolved using a ball mill for 10 hours to form a solution. Add 1.0g of SiO treated with 1% silane coupling agent 2 (Particle size range 50-300nm) and 0.5g DBP in PVDF / NMP solution and mixed in a high-speed mixer at 1000rpm for 10 minutes, then the mixed solution was coated on the surface of PP / PP separator by electrospinning technology, and dried The separator was then extracted with isopropanol after DBP and finally dried to form (PP / PP) / (PVDF / SiO 2 ) Composite diaphragm.

[0044] Diaphragm wettability test: the dried PP / PP diaphragm and (PP / PP) / (PVDF / SiO prepared by the present invention 2 ) The composite diaphragm is laid flat on a horizontal surface in the glove box, and conventional carbonate electrolyte (1MLiPF 6 , EC / EMC=3 / 7 (w / w)) on the two kinds of diaphragms, observing the state of the diaphragm absorbing the electrolyte,...

Embodiment 3

[0045] Embodiment 3 (PP / PE / PP) / (PVDF-co-HFP / Al 2 o 3 ) composite diaphragm (with DBP)

[0046] 5.0g PVDF-co-HFP (Mw=6×10 5 ) was dissolved in 37 g of acetone and dissolved using a ball mill for 8 hours to form a solution. Add 1.0g of Al treated with 1% silane coupling agent 2 o 3 (particle size range 70-300nm) and 0.5g DBP in PVDF-co-HFP / acetone solution and placed in a high-speed mixer and mixed at 1000rpm for 10 minutes, then the mixed solution was coated on PP / PE / PP diaphragm ( 2325) surface, after drying the membrane and then extracting the DBP with isopropanol, the final drying forms PP / PE / PP / (PVDF-co-HFP / Al 2 o 3 ) Composite diaphragm.

[0047] Diaphragm wettability test - the dried 2325 diaphragm and (PP / PE / PP) / (PVDF-co-HFP / Al prepared by the present invention 2 o 3 ) The composite diaphragm is laid flat on a horizontal surface in the glove box, and conventional carbonate electrolyte (1MLiPF 6 , EC / EMC=3 / 7 (w / w)) on the two kinds of diaphragms, observing ...

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Abstract

The invention discloses preparation of a multilayer composite membrane for a secondary battery by using an electrostatic spinning coating technology combined with a pore-forming technology, a manufacturing method of the multilayer composite membrane and the secondary battery prepared by using the membrane. The method is characterized by comprising the following steps of: (1) dissolving a high-molecular organic matter into a solvent to form a high-molecular solution; (2) adding a small-molecular organic matter and / or an inorganic nanometer material into the high-molecular solution to ensure that the small-molecular organic matter is dissolved into the high-molecular solution; dispersing an inorganic nanometer material into the high-molecular solution to form an organic / inorganic mixed solution; (3) uniformly coating the formed organic / inorganic mixed solution on at least one side of a film matrix by using the electrostatic spinning coating technology to form a composite film, and drying the composite film; and (4) extracting the small-molecular organic matter from the dried composite film to continuously dry and form the multilayer composite membrane for the secondary battery. By using the method, an inorganic complex of inorganic membranes is realized quickly and conveniently, the ionic conductivity of the lithium ion battery membrane can be improved, and the heat stability and the security of the battery are guaranteed; and the method has the advantages of being simple in operation and convenient for industrialization.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a composite diaphragm of a lithium ion battery, a preparation method thereof and a secondary battery using the same. Background technique [0002] Lithium-ion batteries have a history of more than 20 years since they were developed and commercialized by Sony Corporation of Japan in 1990. Due to its higher volume specific energy, weight specific energy and good environmental protection, it is gradually replacing traditional lead-acid batteries, nickel-cadmium and nickel-metal hydride batteries, and is widely used in portable 3C electronic devices such as mobile phones and notebook computers. It quickly occupied a large market and developed rapidly. In recent years, the demand for smaller volume and higher energy density of electronic products has become stronger and stronger. In addition, lithium-ion batteries are used in electric tools, electric bicycles and hybrid vehicles. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16B32B27/12
CPCY02E60/10
Inventor 黄碧英孙喜梅
Owner LONG POWER SYST SUZHOU
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