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Preparation method of nano-fiber membrane with three-dimensional porous structure for lithium ion battery diaphragm

A technology of nanofiber membrane and lithium-ion battery, which is applied in the direction of nanotechnology, nanotechnology, and nanotechnology for materials and surface science, and can solve problems such as high cost, low diaphragm strength, and difficulty in industrial production

Inactive Publication Date: 2014-03-05
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages lie in the low production efficiency of electrospinning technology, the difficulty of industrial production, the high cost and the low strength of the diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] a Preparation of nano-aluminum oxide / ethylene-vinyl alcohol copolymer nanofibers

[0038] After uniformly mixing 2g of nano-alumina and 198g of ethylene-vinyl alcohol copolymer, it is melted and extruded by a twin-screw extruder at 150-230°C, drawn and pelletized according to an appropriate draw ratio to obtain nano-alumina Aluminum oxide / ethylene-vinyl alcohol copolymer masterbatch.

[0039]Mix 40g of nano-aluminum oxide / ethylene-vinyl alcohol copolymer masterbatch with 160g of cellulose acetate butyrate evenly, melt and extrude it through a twin-screw extruder, and draw it according to a certain draw ratio to obtain inorganic nanoparticles / ethylene-vinyl alcohol copolymer. Vinyl alcohol copolymer / cellulose acetate butyrate blend fiber.

[0040] The nano aluminum oxide / ethylene-vinyl alcohol copolymer / cellulose acetate butyrate blend fiber is wound on a stainless steel ring and placed in a Soxhlet extraction device, extracted with acetone, and the matrix cellulose ace...

Embodiment 2

[0048] a Preparation of nano-silica / ethylene-vinyl alcohol copolymer nanofibers

[0049] Take 20g of nano-silica and 180g of ethylene-vinyl alcohol copolymer and mix them uniformly, melt and extrude them through a twin-screw extruder at 150-230°C, draw and pelletize according to an appropriate draw ratio to obtain inorganic Nanoparticles / ethylene-vinyl alcohol copolymer masterbatch.

[0050] Get the nano silica / ethylene-vinyl alcohol copolymer masterbatch of 40g and the cellulose acetate butyrate of 160g and evenly mix and extrude through twin-screw extruder, draw out according to certain drawing ratio to obtain nano silica / Ethylene-vinyl alcohol copolymer / cellulose acetate butyrate blend fiber.

[0051] The obtained nano silica / ethylene-vinyl alcohol copolymer / cellulose acetate butyrate blend fiber is wound on a stainless steel ring and placed in a Soxhlet extraction device, extracted with acetone, and the matrix cellulose acetate butyrate is removed to obtain nano Silica / ...

Embodiment 3

[0059] a Preparation of nano-titanium dioxide / ethylene-vinyl alcohol copolymer nanofibers

[0060] After mixing 4g of nano-titanium dioxide with 196g of ethylene-vinyl alcohol copolymer, it is melt-extruded through a twin-screw extruder at 150-230°C, drawn and pelletized according to an appropriate draw ratio to obtain nano-titanium dioxide / ethylene-vinyl alcohol copolymer. Vinyl alcohol copolymer masterbatch.

[0061] Take 40g of nano-titanium dioxide / ethylene-vinyl alcohol copolymer masterbatch and 160g of cellulose acetate butyrate and mix it uniformly, then melt and extrude it through a twin-screw extruder, and draw it according to an appropriate draw ratio to obtain nano-titanium dioxide / ethylene-vinyl alcohol Copolymer / cellulose acetate butyrate blend fiber.

[0062] The obtained nano-titanium dioxide / ethylene-vinyl alcohol copolymer / cellulose acetate butyrate blend fiber is wound on a stainless steel ring and placed in a Soxhlet extraction device, extracted with aceton...

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Abstract

The invention relates to a preparation method of a nano-fiber membrane with a three-dimensional porous structure for a lithium ion battery diaphragm. The preparation method comprises the steps of blending and extruding inorganic nanoparticles, ethylene-vinyl alcohol copolymer and cellulose acetate butyrate; extracting by using acetone to obtain inorganic nanoparticle / ethylene-vinyl alcohol copolymer nano-fibers; then, preparing the nano-fibers into a suspension; uniformly spraying the suspension on two surfaces of a non-woven fabric; drying to obtain an inorganic nanoparticle / ethylene-vinyl alcohol copolymer nano-fiber membrane; then, uniformly spraying the suspension prepared from the inorganic nanoparticles on a membranous layer of the nano-fiber membrane; drying to obtain the nano-fiber membrane with a three-dimensional porous structure for the lithium ion battery diaphragm. The nano-fiber membrane has the advantages of high porosity, high liquid absorption rate, good heat resistance and the like, can effectively absorb an electrolyte solution required by an electrochemical reaction, is favorable for transmission of lithium ions in the diaphragm, and improves the specific capacity, coulomb efficiency and safety performance of a lithium ion battery. The preparation method disclosed by the invention is simple in process, low in production cost, high in efficiency and capable of meeting requirements for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a three-dimensional porous structure nanofiber membrane for a lithium-ion battery diaphragm, and belongs to the field of lithium-ion battery diaphragm materials. Background technique [0002] Lithium-ion battery is a rechargeable secondary battery, which is widely used in portable electronic devices (smartphones, laptops, etc.) ), electric vehicles and hybrid vehicles, while lithium-ion batteries have the advantages of no pollution, etc., and have become the first choice for the development of green energy in the world today. [0003] Lithium-ion batteries are generally composed of positive electrodes, negative electrodes, electrolyte solutions, diaphragms, current collectors, and battery cases. Diaphragms are one of the important components of lithium-ion batteries. Diaphragms have two main functions in lithium batteries: 1. It is to isolate the positive and negative electrodes to avoid short circuit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16D06M15/333D06M15/256D06M11/45D06M11/79D06M11/46D06M11/76D06M11/56B82Y30/00H01M50/403H01M50/411H01M50/417H01M50/431H01M50/44H01M50/443H01M50/446H01M50/489H01M50/491H01M50/497
CPCD06M11/45D06M11/46D06M11/56D06M11/76D06M11/79D06M15/256D06M15/333H01M50/403Y02E60/10
Inventor 王栋夏明周舟刘琼珍陶义飞李沐芳
Owner WUHAN TEXTILE UNIV
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