Self-repairing hydrogel microcapsule composite material and preparation method thereof, self-repairing lithium-sulfur battery cathode and battery

A composite material and lithium-sulfur battery technology, which is applied in non-aqueous electrolyte battery electrodes, battery electrodes, lithium batteries, etc., can solve problems affecting battery performance, low sulfur utilization rate, and poor cycle performance

Active Publication Date: 2020-05-22
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lithium-sulfur batteries will experience a certain degree of volume expansion during charging and discharging, and the volume expansion will lead to cracks in the electrode sheets of lithium-sulfur batteries. The current collector falls off and affects the performance of the battery, resulting in low utilization of sulfur in the battery, poor cycle performance, fast capacity decay, and poor rate performance

Method used

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  • Self-repairing hydrogel microcapsule composite material and preparation method thereof, self-repairing lithium-sulfur battery cathode and battery
  • Self-repairing hydrogel microcapsule composite material and preparation method thereof, self-repairing lithium-sulfur battery cathode and battery
  • Self-repairing hydrogel microcapsule composite material and preparation method thereof, self-repairing lithium-sulfur battery cathode and battery

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Embodiment 1

[0036] A preparation method of self-repairing hydrogel microcapsule composite material, comprising the following steps:

[0037] 1) Disperse 184 μL of phytic acid and 84 μL of pyrrole in 1 mL of isopropanol, and obtain mixed solution A after ultrasonication; take another beaker and dissolve 0.184 g of ammonium sulfate in 2 mL of deionized water to obtain an aqueous solution of ammonium sulfate; A. Ammonium sulfate aqueous solution and deionized water are mixed according to the volume ratio of (1~1.2):(0.8~1):(1~2) to obtain a viscous colorless precursor solution B;

[0038] 2) Disperse 0.2mL of 2-hydroxy-2-methylpropiophenone and 20mL of trimethylol propane ethoxylate triacrylate in 20mL of absolute ethanol, after mixing evenly, place the resulting solution in an oven at 60-80°C for 12h Evaporate absolute ethanol completely to obtain mixed solution C;

[0039] 3) Disperse 20 g of polyvinyl alcohol in 1000 mL of deionized water, place in a water bath and stir at a constant tem...

Embodiment 2

[0042] A preparation method of self-repairing hydrogel microcapsule composite material, comprising the following steps:

[0043] 1) Disperse 184 μL of phytic acid and 84 μL of pyrrole in 1 mL of isopropanol, and obtain mixed solution A after ultrasonication; take another beaker and dissolve 0.184 g of ammonium sulfate in 2 mL of deionized water to obtain an aqueous solution of ammonium sulfate; A. Ammonium sulfate aqueous solution and deionized water are mixed according to the volume ratio of (1~1.2):(0.8~1):(1~2) to obtain a viscous colorless precursor solution B;

[0044] 2) Disperse 0.2mL of 2-hydroxy-2-methylpropiophenone and 20mL of trimethylol propane ethoxylate triacrylate in 20mL of absolute ethanol, after mixing evenly, place the resulting solution in an oven at 60-80°C for 12h , to completely evaporate the absolute ethanol to obtain a mixed solution C;

[0045] 3) Disperse 20 g of polyvinyl alcohol in 1000 mL of deionized water, place in a water bath and stir at a c...

Embodiment 3

[0048] A preparation method of self-repairing hydrogel microcapsule composite material, comprising the following steps:

[0049] 1) Disperse 184 μL of phytic acid and 84 μL of pyrrole in 1 mL of isopropanol, and obtain mixed solution A after ultrasonication; take another beaker and dissolve 0.184 g of ammonium sulfate in 2 mL of deionized water to obtain an aqueous solution of ammonium sulfate; A. Ammonium sulfate aqueous solution and deionized water are mixed according to the volume ratio of (1~1.2):(0.8~1):(1~2) to obtain a viscous colorless precursor solution B;

[0050] 2) Disperse 0.4mL of 2-hydroxy-2-methylpropiophenone and 20mL of trimethylol propane ethoxylate triacrylate in 20mL of absolute ethanol, after mixing evenly, place the resulting solution in an oven at 60-80°C for 12h , baked until the complete evaporation of absolute ethanol to obtain a mixed solution C;

[0051] 3) Disperse 20 g of polyvinyl alcohol in 1000 mL of deionized water, place in a water bath and...

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Abstract

The invention discloses a self-repairing hydrogel microcapsule composite material, a preparation method thereof, a self-repairing lithium-sulfur battery cathode and a battery. The method comprises thesteps of: dissolving pyrrole and phytic acid in isopropanol to obtain a mixed solution A, and mixing the mixed solution A with an ammonium sulfate aqueous solution and deionized water to obtain a precursor solution B; dispersing 2-hydroxy-2-methyl propiophenone and trimethylolpropane ethoxylate triacrylate into absolute ethyl alcohol, and then heating and volatilizing to remove the absolute ethylalcohol, so as to obtain a mixed solution C; taking the precursor solution B, the mixed solution C and the polyvinyl alcohol aqueous solution as an inner phase, an outer phase and a driving phase; preparing a microcapsule by using a liquid drive coaxial flow focusing technology; and doping the self-repairing hydrogel microcapsule composite material into sulfur powder to be used as an active substance for preparing the cathode of a lithium-sulfur battery, and when an electrode plate cracks, releasing hydrogel in a microcapsule to precisely repair cracks of the cathode plate of the lithium-sulfur battery, so that good performance of the lithium-sulfur battery can be maintained.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a self-repairing hydrogel microcapsule composite material and a preparation method thereof, as well as a self-repairing lithium-sulfur battery positive electrode and a battery. Background technique [0002] Due to environmental pollution and the depletion of fossil fuels, the storage of non-renewable energy is decreasing, the climate environment is getting worse, and the ecosystem is becoming more and more fragile. The demand for clean and renewable energy such as solar energy and wind energy is becoming more and more urgent. Therefore, the development of Secondary batteries with high energy density, long cycle life, high safety, environmental protection and low cost are of great significance in the field of new energy. [0003] Lithium-sulfur battery is a kind of lithium battery with sulfur as the positive electrode and metallic lithium as the negative e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M10/052
CPCH01M4/362H01M4/38H01M4/628H01M4/13H01M10/052H01M2004/028Y02E60/10
Inventor 刘金云钟艳韩阗俐朱梦菲乔雪周婷李金金
Owner ANHUI NORMAL UNIV
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