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Polyacrylonitrile/polyacrylic acid nanofiber lithium sulfur battery diaphragm with controllable pore structure

A technology of polyacrylonitrile and polyacrylic acid, applied in the direction of nanotechnology, fiber type, structural parts, etc., can solve the problems of polysulfides not having a good inhibitory effect, capacity decay and poor cycle stability, etc., to achieve fast and effective The preparation method, the pore size distribution can be adjusted, and the effect of small density

Inactive Publication Date: 2018-09-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-sulfur battery separators currently on the market are mainly polyolefin separators based on polyethylene and polypropylene. The chemical properties of these separators are relatively stable, but they do not have a good inhibitory effect on the shuttle of polysulfides. Therefore, Will inevitably produce the defects of capacity fading and poor cycle stability

Method used

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  • Polyacrylonitrile/polyacrylic acid nanofiber lithium sulfur battery diaphragm with controllable pore structure
  • Polyacrylonitrile/polyacrylic acid nanofiber lithium sulfur battery diaphragm with controllable pore structure
  • Polyacrylonitrile/polyacrylic acid nanofiber lithium sulfur battery diaphragm with controllable pore structure

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A polyacrylonitrile / polyacrylic acid nanofiber lithium-sulfur battery separator with controllable pore structure, the preparation method of which is as follows:

[0038]Step 1: Prepare an electrospun polyacrylonitrile / polyacrylic acid composite nanofiber membrane by electrospinning: use N,N-dimethylformamide (Shanghai Lingfeng Chemical Reagent Co., Ltd., ≥99.5%) as a solvent, Weigh polyacrylonitrile (sigma-aldrich, 181315-100G), polyacrylic acid (sigma-aldrich, 181285-100G) and N,N-dimethylformamide in a mass ratio of 6:4:90, and polyacrylonitrile 1. Add polyacrylic acid to N, N-dimethylformamide, place it on a stirring table and stir and dissolve at room temperature (25° C.) at a speed of 700 rpm for 12 hours to obtain a mixed spinning solution; at an ambient temperature of 25 ± 2 degrees Celsius, under the condition of 35 ± 3% air humidity, take 5 milliliters of mixed spinning solution and pour it into a 5 milliliter syringe to control the amount of spun fibers; the s...

Embodiment 2

[0045] Similar to the polyacrylonitrile / polyacrylic acid composite nanofiber with controllable pore structure of Example 1, the difference is: the ratio of polyacrylonitrile, polyacrylic acid and N, N-dimethylformamide in Example 1 is changed to 8:2:90, the obtained product is labeled as polyacrylonitrile / polyacrylic acid composite nanofiber with controllable pore structure-1.

[0046] The fiber diameter of the electrospun polyacrylonitrile / polyacrylic acid composite nanofiber membrane is 0.4-0.5 microns, the porosity is 90.5%, and the pore size distribution of the fiber membrane is 0.4-2.0 microns. The polyacrylonitrile / polyacrylic acid nanofiber lithium-sulfur battery diaphragm with controllable pore structure has a fiber diameter of 0.3-0.8 microns, a porosity of 37.1%, and a fiber membrane pore size distribution of 0.4-1.3 microns.

Embodiment 3

[0048] Similar to the polyacrylonitrile / polyacrylic acid nanofiber with controllable pore structure of Example 1, the difference is: the ratio of polyacrylonitrile, polyacrylic acid and N,N-dimethylformamide in Example 1 is changed to 4 :6:90, the obtained product is labeled as polyacrylonitrile / polyacrylic acid nanofiber-3 with controllable pore structure.

[0049] The fiber diameter of the electrospun polyacrylonitrile / polyacrylic acid composite nanofiber membrane is 0.8-0.9 microns, the porosity is 83.9%, and the pore size distribution of the fiber membrane is 0.3-1.3 microns. The polyacrylonitrile / polyacrylic acid nanofiber lithium-sulfur battery diaphragm with controllable pore structure has a fiber diameter of 0.7-1.2 microns, a porosity of 19.6%, and a fiber membrane pore size distribution of 0.2-0.8 microns.

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Abstract

The invention provides a polyacrylonitrile / polyacrylic acid nanofiber lithium sulfur battery diaphragm with a controllable pore structure. A preparation method of the polyacrylonitrile / polyacrylic acid nanofiber lithium sulfur battery diaphragm with the controllable pore structure is characterized by comprising the following steps: preparing polyacrylonitrile / polyacrylic acid composite nanofibersby electrospinning; performing ethanol vapor treatment to obtain the polyacrylonitrile / polyacrylic acid composite nanofibers with the controllable pore structure. The prepared composite material has the characteristics of complete fiber morphology, uniform pore size distribution and the like. Polyacrylonitrile can act as a composite nanofiber framework while polyacrylic acid is used as a structurecontrol material of the composite nanofibers. The composite nanofiber diaphragm has the advantages of environmental friendliness, high efficiency, precise regulation of pore size and porosity, stablephysical and chemical properties and the like.

Description

technical field [0001] The invention belongs to the technical field of composite nanofibers, and in particular relates to the preparation and application of a polyacrylonitrile / polyacrylic acid nanofiber lithium-sulfur battery diaphragm with controllable pore structure. Background technique [0002] Lithium-sulfur (Li-S) batteries have an ultra-high theoretical specific capacity (1672mAh g -1 ) and energy density (2600W h kg -1 ), and sulfur has become one of the most attractive new battery systems due to its abundant reserves, low price, and environmental friendliness. In lithium-sulfur batteries, the intrinsic characteristics of sulfur's multi-electron reaction bring about the high capacity characteristics of electrode materials, but at the same time lead to more complexity in the lithium-sulfur battery system. The sulfur electrode produces soluble polysulfides during the charge and discharge process. On the one hand, it leads to the diffusion of high-order polysulfides ...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/728D01D5/00H01M2/16B82Y40/00D06B3/10D06M13/144D01F8/08D01F8/10D06M101/26D06M101/28H01M50/44
CPCD01D5/003D01D5/0092D01F8/08D01F8/10D04H1/4382D04H1/728D06B3/10D06M13/144B82Y40/00D06M2101/26D06M2101/28H01M50/411H01M50/44Y02E60/10
Inventor 缪月娥朱晓波刘天西欧阳玥宗伟
Owner DONGHUA UNIV
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