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Polymer-modified composite positive electrode for lithium-sulfur battery and preparation method of composite positive electrode

A technology for lithium-sulfur batteries and composite cathodes, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., to achieve improved cycle stability, excellent cycle performance, and good application prospects

Active Publication Date: 2021-04-02
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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  • Polymer-modified composite positive electrode for lithium-sulfur battery and preparation method of composite positive electrode
  • Polymer-modified composite positive electrode for lithium-sulfur battery and preparation method of composite positive electrode
  • Polymer-modified composite positive electrode for lithium-sulfur battery and preparation method of composite positive electrode

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 a carbon airgel. The obtained carbon airgel 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 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 airgel 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 particularly relates to a polymer-modified composite positive electrode for a lithium-sulfur battery and a preparation method thereof. The method comprises the following steps: taking fructose as a raw material, and preparing biomass carbon by ionothermal carbonization, wherein the biomass carbon has the advantages of low raw material cost, high carbonization rate, small carbonized particles, large specific surface area, heteroatom doping and the like; and loading the biomass carbon with elemental sulfur by using melt diffusion, coating an aluminum foil with a loaded product to prepare an electrode, and then sequentially spraying sulfonated polysulfone and quaternized polysulfone on the surface of the electrode to preparethe polymer-modified composite positive electrode for the lithium-sulfur battery. The average coulombic efficiency of the lithium-sulfur battery assembled by the prepared composite positive electrodecan reach 95% or above, the initial specific capacity is 1298 mAh.g<-1>, the residual specific capacity after 200 cycles is 896 mAh.g<-1>, the capacity retention rate reaches 69.02%, the single-circlecapacity attenuation is only 0.154%, and the composite positive electrode 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 Applications(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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