Preparation method of diaphragm modification material for lithium-sulfur battery

A technology for lithium-sulfur batteries and diaphragm materials, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of slowing lithium ion conduction, decreasing reaction kinetics, and difficult to adsorb polysulfides, etc. Improved cycle stability, simple implementation process, and the effect of suppressing the shuttle effect

Active Publication Date: 2021-06-01
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited polysulfide adsorption sites in these materials, it is difficult to adsorb a large amount of polysulfides generated by charging and discharging.
At the same time, the coating of these separators will inevitably slow down the conduction of lithium ions, resulting in a decrease in the reaction kinetics.

Method used

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  • Preparation method of diaphragm modification material for lithium-sulfur battery
  • Preparation method of diaphragm modification material for lithium-sulfur battery
  • Preparation method of diaphragm modification material for lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take Ti 3 C 2 Colloidal dispersion (5mg / mL, 25mL), add 85 ml of 1,4-dioxane, add 5.4 mg of triaminoguanidine hydrochloride to the above dispersion, ultrasonically disperse for 30 minutes, add 8.1 mg of 1,3,5-triformylphloroglucinol, so that the total mass of triaminoguanidine hydrochloride and 1,3,5-triformylphloroglucinol and Ti 3 C 2 The mass ratio of the template is 3:40. The resulting mixture was processed 3 times continuously through the freeze-vacuum-thaw process, and then the sealed Pyrex bottle was placed at 120 °C for 3 days, and the resulting solid powder was washed sequentially with N,N-dimethylacetamide, water and acetone , and the ionomer-coated two-dimensional material was obtained after vacuum drying. Subsequently, 12.56 mg of the above-mentioned material and polyvinylidene fluoride were uniformly mixed at a mass ratio of 9:1, and suction filtered onto a Celgard 2400 polypropylene diaphragm substrate to obtain the lithium-sulfur battery diaphragm of t...

Embodiment 2

[0044] Take Nb 2 C colloidal dispersion (8 mg / mL, 25 mL), add 85 ml of 1,4-dioxane, add 8.9 mg of triaminoguanidine hydrochloride to the above dispersion, ultrasonically disperse for 40 minutes, add 13.4 mg 1,3,5-triformylphloroglucinol, so that the total mass of triaminoguanidinium hydrochloride and 1,3,5-triformylphloroglucinol and Ti 3 C 2 The mass ratio of the template is 6:40. The resulting mixture was processed 3 times continuously through the process of freezing-vacuumizing-thawing, and then the sealed Pyrex bottle was placed at 120 °C for 3 days, and the resulting solid powder was washed sequentially with N,N-dimethylacetamide, water and acetone , and the ionomer-coated two-dimensional material was obtained after vacuum drying. Subsequently, 10.50 mg of the above-mentioned material and polyvinylidene fluoride were uniformly mixed in a mass ratio of 9:1, and suction filtered onto a Celgard 2400 polypropylene separator substrate to obtain the lithium-sulfur battery se...

Embodiment 3

[0046] Take Ti 3 C 2 Colloidal dispersion (6mg / mL, 25mL), add 85ml of N-methylpyrrolidone, add 1.8mg of triaminoguanidine hydrochloride to the above dispersion, ultrasonically disperse for 30 minutes, add 2.7mg of 1,3, 5-triformylphloroglucinol, so that the total mass of triaminoguanidine hydrochloride and 1,3,5-triformylphloroglucinol and Ti 3 C 2 The mass ratio of the template is 1:40. The resulting mixture was processed 3 times continuously through the process of freezing-vacuumizing-thawing, and then the sealed Pyrex bottle was placed at 120 °C for 3 days, and the resulting solid powder was washed sequentially with N,N-dimethylacetamide, water and acetone , and the ionomer-coated two-dimensional material was obtained after vacuum drying. Subsequently, 12.00 mg of the above-mentioned material and polyvinylidene fluoride were uniformly mixed at a mass ratio of 9:1, and suction filtered onto a Celgard 2400 polypropylene diaphragm substrate to obtain the lithium-sulfur bat...

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Abstract

The invention relates to a preparation method of a diaphragm modification material for a lithium-sulfur battery. The method comprises the following steps: selecting a two-dimensional sheet material with high conductivity and high catalytic activity as a template, coating the surface of the template with a layer of an ionic polymer through a Schiff base reaction of triaminoguanidino hydrochloride and 1,3,5-triformyl phloroglucinol, then mixing the treated template with polyvinylidene fluoride to obtain a dispersion liquid, coating diaphragm substrate with the dispersion liquid, and conducting drying to obtain a modified diaphragm for the lithium-sulfur battery. According to the invention, the ionic polymer coated sheet material coating the diaphragm can accelerate the reaction kinetics of polysulfide intercepted by the diaphragm in an electrostatic adsorption-rapid diffusion-catalytic conversion mode, so the deposition of a solid product on the diaphragm is avoided, and high electrochemical performance under the conditions of high sulfur content and high sulfur loading is realized.

Description

technical field [0001] The invention belongs to the field of battery material preparation and application, and in particular relates to the preparation of a diaphragm modification material for a lithium-sulfur battery. Background technique [0002] With the increasing demand for energy and the increasingly serious environmental pollution, it is particularly important to develop alternative green and clean energy and reduce the massive consumption of fossil fuels, which promotes the rapid development of energy storage technology and equipment. Lithium-sulfur battery due to its high 1675mAh g -1 Theoretical capacity and 2600Wh kg -1 It is considered as an ideal next-generation energy storage material due to its high energy density. However, the poor conductivity of the active material sulfur and its solid-state discharge products, the shuttle effect of polysulfides, and the volume change during charging and discharging hinder the large-scale commercial application of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/417H01M50/451H01M10/052
CPCH01M10/052Y02E60/10
Inventor 李小菊李鹏月律浩伟
Owner FUJIAN NORMAL UNIV
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