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A heat-shrinkable, high-strength, high-permeability lithium battery separator and preparation method thereof

A high-strength, high-permeability technology, applied in the direction of lithium batteries, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of low mechanical strength, low heat resistance, poor electrolyte permeability, etc., and achieve safety High, improve heat resistance, improve the effect of charging and discharging speed

Active Publication Date: 2021-10-01
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium batteries have the characteristics of high specific energy, light weight, small size and long service life. They are used in consumer products such as mobile phones, laptop computers, digital cameras, etc.; in power fields such as electric vehicles and buses; It has been more and more widely used. The lithium battery separator is an important part of the lithium battery. Its main function is to isolate the positive and negative electrodes of the battery to prevent short circuit. At present, most lithium batteries use PE, PP or composite machine surface modified PE and PP films are used as separators. Traditional separators have problems such as low heat resistance, low mechanical strength and poor electrolyte permeability.

Method used

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  • A heat-shrinkable, high-strength, high-permeability lithium battery separator and preparation method thereof
  • A heat-shrinkable, high-strength, high-permeability lithium battery separator and preparation method thereof
  • A heat-shrinkable, high-strength, high-permeability lithium battery separator and preparation method thereof

Examples

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preparation example Construction

[0015] The invention provides a heat-shrinkable, high-strength, high-permeability lithium battery diaphragm and a preparation method thereof, using polyethylene terephthalate (PET) non-woven fabric with good electrolyte penetration effect and excellent heat resistance as the diaphragm for application In the lithium battery, at the same time, because the PET non-woven fabric also has the disadvantages of large pore size and low mechanical strength, the present invention uses meta-aramid fiber (PMIA) to polyethylene terephthalate (PET) without The spun fabric is modified to improve its mechanical strength and reduce the pore size to form a composite separator for lithium batteries.

[0016] A heat-shrinkable, high-strength, high-permeability lithium battery separator includes a PET nonwoven fabric and a PMIA coating coated on one or both sides of the PET nonwoven fabric, and the PMIA coating is obtained by coating an oily PMIA slurry, wherein , the thickness of the coating is 2-...

Embodiment 1

[0038] A heat-shrinkable, high-strength, high-permeability lithium battery separator, comprising a PET non-woven fabric and a PMIA coating coated on one or both sides of the PET non-woven fabric, the PMIA coating is obtained by coating an oily PMIA slurry . The coating thickness is 2 μm.

[0039]Wherein, the oily PMIA slurry contains 10-12% base material by weight percentage, and the balance is an oily solvent. The base material includes the following materials in parts by mass: 10 parts of PMIA, 3 parts of adhesive, and 0.2 parts of dispersant.

Embodiment 2

[0041] A heat-shrinkable, high-strength, high-permeability lithium battery separator, comprising a PET non-woven fabric and a PMIA coating coated on one or both sides of the PET non-woven fabric, the PMIA coating is obtained by coating an oily PMIA slurry , the coating thickness is 3 μm.

[0042] Wherein, the oily PMIA slurry contains 10-12% base material by weight percentage, and the balance is oily solvent, and the base material includes the following substances in parts by mass: 20 parts of PMIA, 4 parts of adhesive and 0.3 parts of dispersant.

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Abstract

The invention relates to a heat-shrinkable, high-strength, high-permeability lithium battery separator and a preparation method thereof. In the method, the prepared oily PMIA slurry is coated on one side or both sides of a PET non-woven fabric to form an oily coating, and then extracted Pore-forming and drying treatments are used to obtain a heat-shrinkable, high-strength, and high-permeability lithium battery separator. In the present invention, the polyethylene terephthalate (PET) non-woven fabric is modified by using meta-aramid fibers (PMIA) with high mechanical strength, so that the battery separator has high heat resistance and high mechanical strength. And the characteristics of high electrolyte permeability, thereby improving the service life, safety and charge and discharge speed of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium battery separators, in particular to a lithium battery separator with heat shrinkage resistance, high strength and high permeability and a preparation method thereof. Background technique [0002] Lithium batteries have the characteristics of high specific energy, light weight, small size and long service life. They are used in consumer products such as mobile phones, laptop computers, digital cameras, etc.; It has been more and more widely used. The lithium battery separator is an important part of the lithium battery. Its main function is to isolate the positive and negative electrodes of the battery to prevent short circuit. At present, most lithium batteries use PE, PP or composite machine after surface modification. PE and PP membranes are used as separators. Traditional separators have problems such as low heat resistance, low mechanical strength, and poor electrolyte permeability. Content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/403H01M10/052H01M50/414H01M50/44
CPCH01M10/052H01M50/409H01M50/403Y02E60/10
Inventor 徐锋田海龙袁海朝苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD