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A composite non-woven battery separator and its preparation method

A battery separator, non-woven technology, applied in the field of composite non-woven battery separator and its preparation, can solve the problems of insufficient liquid absorption rate, large resistance, poor strength of battery separator, etc.

Active Publication Date: 2021-06-15
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems generally exist in the existing diaphragm manufacturing process: (1) Insufficient safety, plastic film products are easily torn under force, and then short-circuited; (2) Insufficient liquid absorption rate: the pores in the existing diaphragm manufacturing process The rate is difficult to control, and the control of the pore size cannot be realized according to the actual situation. The resistance is large, and it cannot effectively block the passage of the positive and negative electrolytes and allow the corresponding ions to pass through; (3) The strength of the battery separator is poor
However, it is difficult to achieve multifunctional composites with a single-structure nonwoven material, so a new composite nonwoven battery separator that can solve the above problems is now needed

Method used

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  • A composite non-woven battery separator and its preparation method
  • A composite non-woven battery separator and its preparation method
  • A composite non-woven battery separator and its preparation method

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Embodiment 1

[0038] A composite nonwoven battery separator, the battery separator is based on a composite nonwoven material composed of a short fiber wet layer, a coarse denier filament layer, an ultrafine fiber layer and a fine denier filament layer. A composite diaphragm formed by branched carboxyl and / or sulfonic acid functional groups, wherein the short fiber wet-laid layer is made of PE / PP sheath-core bicomponent fiber with a fiber fineness of 0.5-0.8 denier (purchased from Jiangnan Gao Fiber Co., Ltd.) and polypropylene fibers with a fiber fineness of 1.6 to 2 deniers, the mass fraction of PE / PP sheath-core bicomponent fibers in the short fiber wet layer is 60 to 75%, and the length 6~16mm, the mass fraction of polypropylene fiber is 25~40%, and the length is 6~16mm, and the thickness of the short fiber wet layer is 0.05~0.06mm; 6~8 denier polypropylene filament, the weight of the coarse denier filament layer is 20~50g / m 2 , with a thickness of 0.04~0.06mm, the superfine fiber layer...

Embodiment 2

[0053] Such as Figure 1-5 As shown, a composite nonwoven battery separator, the battery separator is based on a composite nonwoven material composed of short fiber wet layer, coarse denier filament layer, ultrafine fiber layer and fine denier filament layer, A composite diaphragm formed by radiation grafting of carboxyl and / or sulfonic acid functional groups, wherein the short fiber wet-laid layer is made of PE / PP sheath-core bicomponent fibers with a fiber fineness of 0.6 denier and fiber fineness It is composed of polypropylene fibers with a denier of 1.8, the mass fraction of PE / PP sheath-core bicomponent fibers in the short fiber wet-laid layer is 68%, the length is 11mm, and the mass fraction of polypropylene fibers is 32%, The length is 11mm, and the thickness of the short fiber wet layer is 0.055mm; the coarse denier filament layer is made of polypropylene filament with a fiber fineness of 7 deniers, and the grammage of the coarse denier filament layer is 35g / m 2 , w...

Embodiment 3

[0065] A composite nonwoven battery separator, the battery separator is based on a composite nonwoven material composed of a short fiber wet layer, a coarse denier filament layer, an ultrafine fiber layer and a fine denier filament layer. A composite diaphragm formed by branched carboxyl and / or sulfonic acid functional groups, wherein the short fiber wet-laid layer is made of PE / PP sheath-core bicomponent fibers with a fiber fineness of 0.8 denier and a fiber fineness of 1.7 denier Neil's polypropylene fiber composition, the mass fraction of PE / PP sheath-core bicomponent fiber in the short fiber wet-laid layer is 70%, the length is 8mm, the mass fraction of polypropylene fiber is 30%, and the length is 8mm , the thickness of the short fiber wet layer is 0.053mm; the coarse denier filament layer is made of polypropylene filament with a fiber fineness of 6 deniers, and the grammage of the coarse denier filament layer is 25g / m 2 , with a thickness of 0.046mm, the ultrafine fibe...

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Abstract

The invention provides a composite nonwoven battery separator and a preparation method thereof. The material is a substrate, a composite diaphragm formed by grafting carboxyl and / or sulfonic acid functional groups through radiation, and the short fiber wet layer is made of PE / PP sheath-core bicomponent fiber with a fiber fineness of 0.5~0.8D and The fiber fineness is composed of polypropylene fibers with a fiber fineness of 1.6~2D, the coarse denier filament layer is composed of polypropylene filaments with a fiber fineness of 6~8D, and the ultrafine fiber layer is made of polypropylene fibers with a fineness of 200~6000nm Composed of polypropylene fibers, the fine denier filament layer is composed of polypropylene filaments with a fiber fineness of 1.2-2.0D. The composite nonwoven battery separator provided by the invention has controllable aperture, large porosity, and low thickness, which can effectively isolate the positive and negative electrolytes while allowing corresponding ions to pass through, and can avoid pressure point plastic The problem of forming a film.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a composite nonwoven battery separator and a preparation method thereof. Background technique [0002] As the global energy crisis intensifies and environmental issues become more prominent, it is gradually becoming a trend for renewable energy to replace fossil fuels. The storage and use of renewable energy is inseparable from the development of chemical power sources. Among various types of chemical power systems, lithium-ion batteries have become the most popular secondary batteries because of their high voltage, high specific energy, and long life. secondary battery. At present, my country is committed to strengthening the application of lithium-ion batteries in the field of energy storage systems and new energy vehicles and other large-scale power batteries. The ultimate strategic goal of the transition from traditional power vehicles to electric drive vehicles, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/44H01M50/417H01M50/403
CPCH01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 张恒甄琪张一风刘让同章伟刘雍
Owner ZHONGYUAN ENGINEERING COLLEGE
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