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A polymer modified composite positive electrode for lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and composite cathode technology, applied in battery electrodes, lithium storage batteries, electrode manufacturing, etc., to achieve the effects of easy transmission, large specific surface area, and inhibition of shuttle effect

Active Publication Date: 2022-04-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to completely inhibit the shuttle of lithium polysulfide by simple adsorption, so researchers often introduce other means of adsorbing or inhibiting the shuttle of lithium polysulfide.

Method used

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  • A polymer modified composite positive electrode for lithium-sulfur battery and preparation method thereof
  • A polymer modified composite positive electrode for lithium-sulfur battery and preparation method thereof
  • A polymer modified composite positive electrode for lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of Porous Carbon A Using Fructose as Carbon Source

[0034] Mix 6.11345g 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) with 5.577g ferric chloride (FeCl 3 ) mixed, fully stirred and mixed with a magnetic stirrer, and centrifuged in a high-speed centrifuge to remove insoluble matter to obtain an ionic liquid ([Bmim]FeCl 4 ), and the temperature was kept at 80 °C in an electric constant temperature blast drying oven for 12 hours.

[0035] Add 2 g of fructose to 5 mL of the above ionic liquid, stir for 2 h with a magnetic stirrer until the fructose is fully dissolved, transfer the mixture into a 25 mL high-temperature reaction kettle, and keep it in an oven at 180 ° C for 8 h to obtain carbon aerogels. The obtained carbon aerogel was washed five times with a mixed solvent of ethanol and acetone to wash away excess ionic liquid, and the sample was treated with 0.5M dilute hydrochloric acid to remove residual Fe and then fully dried to obtain a porou...

Embodiment 2

[0037] Example 2 Preparation of Porous Carbon B Using Fructose as Carbon Source

[0038] Mix 8.7335g 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) with 8.11g ferric chloride (FeCl 3) mixed, fully stirred and mixed with a magnetic stirrer, and centrifuged in a high-speed centrifuge to remove insoluble matter to obtain an ionic liquid ([Bmim]FeCl 4 ), and the temperature was kept at 80 °C in an electric constant temperature blast drying oven for 12 hours.

[0039] Add 3 g of fructose to 10 mL of the above ionic liquid, stir for 3 h with a magnetic stirrer until the fructose is fully dissolved, transfer the mixture into a 25 mL high-temperature reaction kettle, and keep it in an oven at 180 ° C for 10 h to obtain a carbon airgel. The obtained carbon aerogel was washed five times with a mixed solvent of ethanol and acetone to wash away excess ionic liquid, and the sample was treated with 0.5M dilute hydrochloric acid to remove residual Fe and then fully dried to obtain a porous...

Embodiment 3

[0041] The preparation of embodiment 3 sulfur-carbon composite material A

[0042] Take 100mg of porous carbon A prepared in Example 1 and mix evenly with 200mg of sublimated sulfur, heat the mixture to 155°C under vacuum and keep it for 10h to obtain sulfur-carbon composite material A.

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Abstract

The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a polymer-modified composite positive electrode for lithium-sulfur batteries and a preparation method thereof. The invention uses fructose as a raw material and prepares biomass carbon through an ionic heat carbonization method, which has the advantages of low raw material cost, high carbonization rate, small particles after carbonization, large specific surface, and heteroatom doping. The elemental sulfur is loaded by the melt diffusion method, coated on aluminum foil to make an electrode, and then sulfonated polysulfone and quaternized polysulfone are sequentially sprayed on the surface to prepare a polymer-modified composite positive electrode for lithium-sulfur batteries. The average coulombic efficiency of the lithium-sulfur battery assembled with the prepared composite cathode can reach more than 95%, and the initial specific capacity is 1298mAh g ‑1 , with a remaining specific capacity of 896 mAh g after 200 cycles ‑1 , the capacity retention rate reaches 69.02%, and the single-turn capacity attenuation is only 0.154%, which has a good application prospect.

Description

technical field [0001] The invention relates to a polymer-modified composite positive electrode for lithium-sulfur batteries and a preparation method thereof, belonging to the field of lithium-sulfur batteries. Background technique [0002] With the development of science and technology and social progress, the problems of environmental pollution and resource scarcity have become increasingly serious, seriously limiting the sustainable development of society. The development of new energy is one of the important ways for human beings to reduce carbon emissions and optimize the energy structure. The development of energy storage technology is particularly critical, among which electrochemical energy storage plays an irreplaceable role in today's society. Among many electrochemical secondary battery systems, lithium-ion batteries are increasingly favored by people because of their high energy density and cycle life. However, with the popularity of new energy vehicles and oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M4/139H01M4/04H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M4/13H01M4/139H01M4/0419H01M10/052Y02E60/10
Inventor 陈栋阳江鹏谢在来
Owner FUZHOU UNIV
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