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Preparation method of composite material used as lithium-sulfur battery cathode material

A technology for positive electrode materials and lithium-sulfur batteries, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low utilization rate of positive electrode active materials and poor cycle stability of lithium-sulfur batteries, and achieve low price and easy operation. The effect of convenience and simple synthesis method

Active Publication Date: 2017-02-01
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low utilization rate of positive electrode active materials and poor cycle stability of lithium-sulfur batteries, the present invention provides a preparation method of a layered inorganic compound / conductive polymer / sulfur composite material as the positive electrode material of lithium-sulfur batteries

Method used

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  • Preparation method of composite material used as lithium-sulfur battery cathode material
  • Preparation method of composite material used as lithium-sulfur battery cathode material
  • Preparation method of composite material used as lithium-sulfur battery cathode material

Examples

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Effect test

Embodiment 1

[0027] (1) Stripping of montmorillonite: Prepare 1mM montmorillonite solution, add 15mM sulfuric acid, and stir for 5h.

[0028] (2) Polymer monomer intercalation and sulfur dispersion: Add 20mM acrylonitrile monomer to the acidified montmorillonite solution, and disperse for 5 hours at a speed of 100r / min. According to the total mass of montmorillonite and polyacrylonitrile: Add elemental sulfur at a ratio of 1:1, ultrasonically disperse for 30 minutes, and then use a high-speed mixer to stir for 1 hour, so that the purity of 99% sulfur element with a particle size of 5 μm is uniformly dispersed in the mixed solution.

[0029] (3) Polymerization coating: slowly drop 30mM sodium persulfate into the mixed solution, and the dropping time is controlled at 10min. The molar ratio of sodium persulfate to acrylonitrile monomer is 1:1.

[0030] (4) Re-aggregation of layered inorganic compounds: Add potassium hydroxide with a concentration of 0.5M to the mixed solution, and the droppi...

Embodiment 2

[0032] (1) Exfoliation of layered inorganic compounds: Prepare 15 mM zirconium phosphate aqueous solution, add intercalation agent 20 mM tetrabutylammonium hydroxide, stir for 6 hours, and form a transparent colloidal solution after the exfoliation is completed.

[0033] (2) Polymer monomer intercalation and sulfur dispersion: Add 20mM pyrrole monomer to the solution after peeling, and disperse for 4 hours at a speed of 800r / min. According to the total mass of zirconium phosphate and polypyrrole: sulfur element = 4: Add elemental sulfur at a ratio of 6, ultrasonically disperse for 40 minutes, and then use a high-speed mixer to stir for 4 hours, so that the purity of 99% sulfur element with a particle size of 3 μm is evenly dispersed in the mixed solution.

[0034] (3) Polymerization coating: slowly drop 30mM ferric chloride into the mixed solution, and the dropping time is controlled at 120 min. The molar ratio of ferric chloride to pyrrole monomer is 2:1.

[0035] (4) Re-agg...

Embodiment 3

[0040] (1) Stripping of layered inorganic compounds: Prepare 5mM tin phosphate aqueous solution, add intercalation agent 10mM tetrabutylammonium hydroxide, stir for 12h, and form a transparent colloidal solution after stripping.

[0041] (2) Polymer monomer intercalation and sulfur dispersion: Add 10mM pyrrole monomer to the solution after peeling, and disperse for 1 hour at a speed of 2000r / min. According to the total mass of tin phosphate and polypyrrole: sulfur element = 3: Add elemental sulfur at a ratio of 7, ultrasonically disperse for 60 minutes, and then use a high-speed mixer to stir for 4 hours, so that the purity of 99% sulfur element with a particle size of 3 μm is evenly dispersed in the mixed solution.

[0042] (3) Polymerization coating: slowly drop 15mM ferric chloride into the mixed solution, and the dropping time is controlled at 80 min. The molar ratio of ferric chloride to pyrrole monomer is 1.5:1.

[0043] (4) Re-agglomeration of layered inorganic compoun...

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Abstract

The invention belongs to the field of preparation of a lithium-sulfur battery cathode material, and particularly relates to a preparation method of a layered inorganic compound / conducting polymer / sulfur composite material used as the lithium-sulfur battery cathode material. According to the preparation method disclosed by the invention, a polymer and an inorganic layered compound are compounded in nanoscale, sulfur is coated and clamped between slice layers, so that a shuttling effect of sulfur is prevented; a layered material, e.g., a spring, can buffer a stress of volume expansion, keeps an inherent structure of the material, reduces active substance loss caused by volume expansion, and improves material cycle performance; the organic and inorganic composite layered material has a potential response cation exchange attribute, has a synergistic effect in the charging and discharging process when being compounded with sulfur, and improves rate capability of a battery; and a layer spacing of the layered compound can be regulated, and the suitable layer spacing is beneficial to transmission of Li+. The preparation method disclosed by the invention is simple in process step and convenient to operate; and the layered inorganic compound / conducting polymer / sulfur composite material has a wide application prospect in the lithium-sulfur battery cathode material.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-sulfur battery anode materials, in particular to a method for preparing a layered inorganic compound / conductive polymer / sulfur composite material used as a lithium-sulfur battery anode material. Background technique [0002] With the rapid development of mobile electronic devices and new energy vehicles, human beings have higher and higher requirements on the specific energy and specific power of secondary energy storage batteries. Lithium-ion battery is one of the widely used secondary batteries at present. The theoretical capacity of commercialized positive electrode materials is low. Due to the limitation of theoretical specific capacity, it is very difficult to further increase the energy density, which cannot meet the requirements of future development for high energy density. Due to the high theoretical specific capacity of lithium storage of 1675mAh / g, and the elemental sulfur as the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/50H01M4/58H01M4/60H01M10/052
CPCH01M4/366H01M4/38H01M4/483H01M4/502H01M4/5825H01M4/602H01M10/052Y02E60/10
Inventor 王忠德刘晔岳喜岩郭守敬李青宋为涛郝晓刚
Owner TAIYUAN UNIV OF TECH
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