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Sulfur-containing porous Yolk-shell structure particle as well as preparation method and application thereof

A particle and elemental sulfur technology, applied to structural parts, electrical components, battery electrodes, etc., can solve the problems of shell structure damage and reduce the restrictive effect of shell structure

Pending Publication Date: 2022-04-12
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lithium-sulfur battery prepared with this structure cycles 1000 cycles at 0.5C, and the attenuation rate is 0.033% per cycle, but the Yolk-shell structure is prepared

Method used

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  • Sulfur-containing porous Yolk-shell structure particle as well as preparation method and application thereof
  • Sulfur-containing porous Yolk-shell structure particle as well as preparation method and application thereof
  • Sulfur-containing porous Yolk-shell structure particle as well as preparation method and application thereof

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preparation example Construction

[0037] The invention provides a method for preparing sulfur-containing porous Yolk-shell particles, comprising the following steps:

[0038] (1) mixing elemental sulfur with an oil phase solvent to obtain an oil phase;

[0039] (2) mixing the emulsifier with water to obtain an aqueous phase;

[0040] (3) mixing the oil phase obtained in the step (1) with the water phase obtained in the step (2), and emulsifying to obtain a mixed solution;

[0041] (4) Evaporating the oil phase solvent in the mixed solution obtained in the step (3) to obtain sulfur-containing porous Yolk-shell particles;

[0042] The steps (1) and (2) are in no sequence.

[0043] The present invention mixes elemental sulfur with an oil phase solvent to obtain an oil phase.

[0044] In the present invention, the source of the elemental sulfur is not particularly limited, and commercially available products well known to those skilled in the art can be used. In the present invention, there is no special limit...

Embodiment 1

[0079] The preparation method of sulfur-containing porous Yolk-shell structure particles is as follows:

[0080] (1) 0.5g of elemental sulfur is dropped into 10mL of carbon disulfide, and mixed to obtain an oil phase;

[0081] (2) Dissolve 2.5g of PVA in 100mL of pure water at 95°C to obtain the water phase;

[0082] (3) Mix the oil phase obtained in the step (1) with the water phase obtained in the step (2), emulsify in an emulsifier at 5000r / min for 5min, and then let stand for 2h to obtain an emulsion;

[0083] (4) Add 5g of glutaraldehyde aqueous solution (concentration is 50wt%) in the emulsion that described step (3) obtains, slowly stir at 25 ℃ and carry out cross-linking reaction 12h, carry out centrifugal separation, washing successively again, obtain glue Beam particles; wherein, the centrifugal separation speed is 8000rpm, and the time is 10min; the washing operation is pure water washing twice;

[0084] (5) stirring and dispersing the micelle particles obtained i...

Embodiment 2

[0096] On the basis of embodiment 1, the number of porous aluminum foil holes in step (6) is changed to 10, and the evaporation rate is 0.25mg / min; other conditions are constant, and obtain sulfur-containing porous Yolk-shell structure particles, which are denoted as S@ PVA2 particles.

[0097] Figure 8 Scanning electron micrograph of the sulfur-containing porous Yolk-shell particles prepared in Example 2. from Figure 8 It can be seen that the number of surface pores of the Yolk-shell particles is reduced, and the surface porosity is 0.35%, which is about 81% lower than that of the particles prepared in Example 1.

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Abstract

The invention provides a preparation method of sulfur-containing porous Yolk-shell structure particles, which comprises the following steps: mixing elemental sulfur with an oil phase solvent to obtain an oil phase; mixing an emulsifier with water to obtain a water phase; mixing the oil phase and the water phase, and emulsifying to obtain a mixed solution; the oil phase solvent in the mixed solution is evaporated, and the sulfur-containing porous Yolk-shell structure particles are obtained. A self-emulsifying method is adopted, the elemental sulfur and the oil-phase solvent are used as an oil phase, the emulsifier and water are used as a water phase, emulsification is performed to form core-shell structure particles with the oil phase coated with the emulsifier, then the oil-phase solvent is evaporated, the sulfur-containing Yolk-shell structure particles with pore structures on the surfaces can be obtained without etching, the porosity is low, and the preparation method is simple and easy to implement. And the shuttle effect of polysulfide can be obviously inhibited while the lithium ion transmission is not influenced.

Description

technical field [0001] The invention belongs to the technical field of preparation of cathode materials for lithium-sulfur batteries, and in particular relates to a sulfur-containing porous Yolk-shell structure particle and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become an indispensable and important energy storage device in people's lives. However, batteries using lithium iron phosphate as the positive electrode material are currently limited by low energy density, making it difficult to obtain further development. Lithium-sulfur batteries are gradually being valued. It is a lithium battery that uses sulfur as the positive electrode material of the battery and lithium metal as the negative electrode material. Elemental sulfur is abundant in the earth and has the characteristics of low price and environmental friendliness. The lithium-sulfur battery using sulfur as the positive electrode material has a high mate...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M10/052
Inventor 施德安周尤爽
Owner HUBEI UNIV
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