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Preparation method of secondary functionalized double-coating modified polyether sulfone lithium-sulfur battery diaphragm

A lithium-sulfur battery and sulfonated polyethersulfone technology, which is applied in secondary batteries, secondary battery repair/maintenance, lithium batteries, etc., can solve problems such as low melting point, inability to effectively suppress the shuttle effect, low discharge capacity and Coulombic efficiency, etc. Problems, to achieve good adsorption, excellent rate performance, improve the effect of puncture strength and liquid absorption rate

Pending Publication Date: 2022-03-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inability to effectively suppress the shuttle effect during the charging and discharging process of lithium-sulfur batteries, lithium-sulfur batteries using traditional polyolefin separators often have low discharge capacity and coulombic efficiency. Urgent improvement

Method used

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  • Preparation method of secondary functionalized double-coating modified polyether sulfone lithium-sulfur battery diaphragm

Examples

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Effect test

Embodiment 1

[0028] Example 1: at N 2 Atmosphere, under the conditions of 25°C and 2000rpm stirring, dissolve 5g of polyethersulfone PES in 110g of dichloromethane to obtain the first solution, then slowly add 50g of chlorosulfonic acid to the first solution at 25°C to react for 3h to form Mix the solution, then immerse the mixed solution in cold water for 3 hours to produce a precipitate, filter the mixed solution to obtain the precipitate, and wash the precipitate with deionized water several times until the pH becomes 5, then dry the precipitate at 120°C under vacuum for 48 hours to obtain a dry sulfonated Polyethersulfone SPES;

[0029] Take 4g of sulfonated polyethersulfone and 2g of polyacrylonitrile, dissolve them in 50g of dimethylformamide, and prepare a precursor solution with a certain concentration. The precursor solution is aged at 60°C for 12h, stirred for 24h, and left to stand for 24h; then Electrospinning was performed with the precursor solution, the spinning voltage was...

Embodiment 2

[0035] Example 2: at N 2 Atmosphere, under the conditions of 25°C and 2000rpm stirring, dissolve 7g of polyethersulfone PES in 150g of dichloromethane to obtain the first solution, and then slowly add 60g of concentrated sulfuric acid to the first solution at 25°C to react for 4h to form a mixture solution, then the mixed solution was immersed in cold water for 4 hours to produce a precipitate, the mixed solution was filtered to obtain the precipitate, and the precipitate was washed with deionized water for several times until the pH became 5, and then the precipitate was dried at 120°C under vacuum for 48 hours to obtain a dry sulfonated poly Ethersulfone SPES;

[0036] Take 5g of sulfonated polyethersulfone, 1g of polyacrylonitrile and 1.5g of polyether ether ketone, dissolve them in 55g of dimethylacetamide, and prepare a certain concentration of precursor solution. The precursor solution is aged at 65°C for 18h, stirred 28h, stand still for 24h; then use the precursor sol...

Embodiment 3

[0042] Example 3: at N 2 Atmosphere, under the conditions of 25°C and 2000rpm stirring, dissolve 10g polyethersulfone PES in 200g methylene chloride to obtain the first solution, then slowly add 100g chlorosulfonic acid to the first solution at 25°C to react for 5h to form Mix the solution, then immerse the mixed solution in cold water for 5 hours to produce a precipitate, filter the mixed solution to obtain the precipitate, and wash the precipitate with deionized water several times until the pH becomes 5, then dry the precipitate at 120°C for 54 hours under vacuum to obtain a dry sulfonated Polyethersulfone SPES;

[0043] Take 4g of sulfonated polyethersulfone and 1.8g of polyimide, dissolve them in 45g of dimethyl sulfoxide, and prepare a certain concentration of precursor solution. The precursor solution is aged at 70°C for 20h, stirred for 30h, and left standing for 30h ; Then use the precursor solution to carry out electrospinning, set the spinning voltage to 20KV, the ...

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Abstract

The invention relates to a preparation method of a secondary functionalized double-coating modified polyether sulfone lithium-sulfur battery diaphragm. Comprising the following steps: firstly, preparing sulfonated polyethersulfone, mixing the sulfonated polyethersulfone and a high-molecular polymer in proportion, curing, stirring and defoaming to obtain a spinning precursor solution, and then spinning to obtain a fiber membrane; and grafting a secondary monomer on the surface of the dried fiber membrane, and immersing the fiber membrane into modified dopamine to obtain the secondary functionalized double-coating modified polyether sulfone lithium-sulfur battery diaphragm. According to the prepared secondary functionalized double-coating modified polyether sulfone lithium-sulfur battery diaphragm, the capacity retention ratio and the rate capability of a battery can be remarkably improved; the liquid absorption rate and the safety performance are high; the diaphragm is simple in preparation condition and low in process cost.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery materials, and particularly designs a method for preparing a secondary functional double-coated modified polyethersulfone lithium-sulfur battery diaphragm. Background technique [0002] At present, lithium-ion batteries are widely used in various portable electronic devices and electric vehicles. However, with the continuous development of society, the limitation of theoretical specific capacity of lithium-ion batteries makes it unable to meet the needs of technological development. In order to further expand the application prospects of lithium-ion batteries, batteries of various systems have attracted the attention of researchers. Lithium-sulfur batteries have high theoretical specific capacity and energy density, and the active material elemental sulfur is rich in resources, low in cost, and environmentally friendly, and has great potential to become the next generation of new energy stora...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/457H01M50/414H01M50/446H01M10/052H01M10/42
CPCH01M10/052H01M10/4235Y02E60/10
Inventor 刘久清刘萌
Owner CENT SOUTH UNIV
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