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Poly-sulfur-tin powder stable lithium-sulfur battery sulfur electrode material and preparation method

A lithium-sulfur battery, polymerized sulfur technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low electrical conductivity and electronic conductivity, and lithium polysulfide piercing the separator.

Inactive Publication Date: 2018-07-20
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects of low electrical conductivity and electronic conductivity of existing lithium-sulfur batteries, and sulfur easily forming lithium polysulfides to pierce the separator, the present invention proposes a polymeric sulfur-tin powder with excellent electrical conductivity, high discharge capacity, and good battery cycle stability Stable lithium-sulfur battery sulfur electrode material and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of polymer sulfur-tin powder stabilized lithium-sulfur battery sulfur electrode material, the steps are as follows:

[0029] a. Mix elemental sulfur and nano-polyaniline powder with a particle size of 50nm evenly, add an ionic liquid at a temperature of 50°C, and stir to obtain a mixed solution with a viscosity of 800CP, and condense and spray the mixed solution in a condensing spray tower Drying, the rotational speed of the centrifugal head of the condensation spray tower is 1000r / min, the aperture of the spray ring is 0.3mm, and the drying temperature is 50°C to obtain spherical composite sulfur powder; wherein, the solid-liquid mixture of elemental sulfur, nano polyaniline powder and ionic liquid The ratio is 3g:6g:30mL; the ionic liquid is 1-(4-sulfonic acid) butylpyridine;

[0030] B, get polysulfur and tin powder, mix according to mass ratio 4:7 in vertical grinder, grind and disperse, obtain the mixed powder that particle size is 600nm;

[0031] c....

Embodiment 2

[0035] The preparation of polymer sulfur-tin powder stabilized lithium-sulfur battery sulfur electrode material, the steps are as follows:

[0036] a. Mix elemental sulfur and nano-polyaniline powder with a particle size of 100nm evenly, add an ionic liquid at a temperature of 40°C, and stir to obtain a mixed solution with a viscosity of 1000CP, and condense and spray the mixed solution in a condensing spray tower Drying, the rotational speed of the centrifugal head of the condensation spray tower is 800r / min, the aperture of the spray ring is 0.5mm, and the drying temperature is 40°C to obtain spherical composite sulfur powder; wherein, the solid-liquid mixture of elemental sulfur, nano polyaniline powder and ionic liquid Ratio is 5g: 7g: 25mL; The ionic liquid is 1-butyl-3-methylimidazole tetrahydroboric acid;

[0037] B, get polymeric sulfur and tin powder, mix according to mass ratio 3:6 in disc grinder, grind and disperse, obtain the mixed powder that particle size is 100...

Embodiment 3

[0042] The preparation of polymer sulfur-tin powder stabilized lithium-sulfur battery sulfur electrode material, the steps are as follows:

[0043] a. Mix elemental sulfur and nano-polyaniline powder with a particle size of 60nm evenly, add an ionic liquid at a temperature of 60°C, and stir to obtain a mixed solution with a viscosity of 700CP, and condense and spray the mixed solution in a condensing spray tower Drying, the rotational speed of the centrifugal head of the condensing spray tower is 1200r / min, the aperture of the spray ring is 0.3mm, and the drying temperature is 45°C to obtain spherical composite sulfur powder; wherein, the solid-liquid mixture of elemental sulfur, nano polyaniline powder and ionic liquid The ratio is 2g: 10g: 28mL; the ionic liquid is 1-allyl-3-methylimidazolium chloride;

[0044] B, get polymerized sulfur and tin powder, mix according to mass ratio 3:5 in vertical grinder, grind and disperse, obtain the mixed powder that particle diameter is 7...

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Abstract

The invention belongs to the technical field of preparation of a battery electrode material, specifically relates to a poly-sulfur-tin powder stable lithium-sulfur battery sulfur electrode material and a preparation method thereof. According to the poly-sulfur-tin powder stable lithium-sulfur battery sulfur electrode material, elementary sulfur, an ionic liquid and polyaniline nanometer powder areprocessed and sprayed, dried and condensed to obtain spherical composite sulfur powder; and next, poly sulfur and tin powder are grinded and dispersed to be sprayed and coated on the surface of spherical composite sulfur powder to obtain the poly-sulfur-tin powder stable sulfur electrode material. Through thermal ionic liquid and polyaniline nanometer powder doping and fixing, the sulfur electrode material remains relatively excellent conductivity; through further coating of poly sulfur and tin powder, excellent conductivity is achieved, and sulfur volume expansion and crack can be preventedeffectively by virtue of elasticity of the poly sulfur, thereby preventing diffusion loss to a body electrolyte; and excellent affinity with elementary sulfur is achieved, so that more elementary sulfur can be accommodated and loaded, thereby ensuring high discharge capacity and improving battery cycle stability.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and in particular relates to a sulfur electrode material for a lithium-sulfur battery stabilized by polymerized sulfur-tin powder and a preparation method thereof. Background technique [0002] With the application of batteries in electric vehicles, product performance continues to improve, but the current large-scale commercialized batteries cannot meet the application requirements of high capacity and high energy density, especially the current power battery system hopes to further extend the battery life The goal of mileage puts forward higher requirements for new batteries. [0003] Sulfur cathode materials for lithium-sulfur batteries are one of the hotspots in the research of electrode materials for high-capacity batteries in recent years. Compared with traditional lithium-ion battery oxide electrode materials, sulfur cathode materials have unique advantages ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/36H01M4/366H01M4/387H01M10/0525Y02E60/10
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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