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 rela

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

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Example Embodiment

[0036] Example 1

[0037] A polyacrylonitrile / polyacrylic acid nanofiber lithium-sulfur battery separator with controllable pore structure, and a preparation method thereof:

[0038]Step 1: Electrospinning polyacrylonitrile / polyacrylic acid composite nanofiber membrane is prepared by electrospinning: using N,N-dimethylformamide (Shanghai Lingfeng Chemical Reagent Co., Ltd., ≥99.5%) as solvent, Polyacrylonitrile (sigma-aldrich, 181315-100G), polyacrylic acid (sigma-aldrich, 181285-100G) and N,N-dimethylformamide were weighed in a mass ratio of 6:4:90, and polyacrylonitrile was , polyacrylic acid was added to N, N-dimethylformamide, placed on a stirring table and stirred and dissolved at room temperature (25° C.) at a speed of 700 rpm for 12 hours to obtain a mixed spinning solution; the ambient temperature was 25± Under the conditions of 2 degrees Celsius and an air humidity of 35±3%, take 5 ml of mixed spinning solution and pour it into a 5 ml syringe to control the amount of...

Example Embodiment

[0044] Example 2

[0045] Similar to the polyacrylonitrile / polyacrylic acid composite nanofibers with controllable pore structure in 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 nanofibers-1 with controllable pore structure.

[0046] In the electrospun polyacrylonitrile / polyacrylic acid composite nanofiber membrane, the fiber diameter 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 separator 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.

Example Embodiment

[0047] Example 3

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

[0049] In the electrospun polyacrylonitrile / polyacrylic acid composite nanofiber membrane, the fiber diameter 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 separator 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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