Iron sulfide@sulfur hybrid porous carbon positive electrode precursor material and preparation and application of sulfur-loaded positive electrode active material thereof

An iron sulfide, active material technology, applied in the preparation/purification of carbon, nanotechnology for materials and surface science, positive electrodes, etc. low, insufficient reaction interface, etc., to achieve the effect of inhibiting the shuttle effect, excellent capacity, and improving low capacity

Active Publication Date: 2020-06-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insufficient reaction interface during the charging and discharging process leads to low sulfur loading in the battery pole piece. At the same time, the

Method used

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  • Iron sulfide@sulfur hybrid porous carbon positive electrode precursor material and preparation and application of sulfur-loaded positive electrode active material thereof
  • Iron sulfide@sulfur hybrid porous carbon positive electrode precursor material and preparation and application of sulfur-loaded positive electrode active material thereof
  • Iron sulfide@sulfur hybrid porous carbon positive electrode precursor material and preparation and application of sulfur-loaded positive electrode active material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] 5 kg of starch, 5 kg of 50nm SiO 2 Add the template dispersion, 30 grams of iron acetate and 50 grams of sodium dodecylsulfonate into 10L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, and pulverize the dried slurry Afterwards, carbonize in a carbonization furnace at 1200°C for three hours under an argon atmosphere; the carbonized product is washed with 10M sodium hydroxide solution at a temperature of 100°C to remove SiO 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then the carbon material was dried, mixed with 1 kg of sublimated sulfur powder and ball-milled evenly, and then heat treated in an argon atmosphere; the heat treatment temperature was 650°C, the time was 3 hours, and the heating rate was 5°C / min. A locally graphitized thiabridized porous carbon material with rich pore structure and in-situ growth of iron sulfide particles on the surface of the carbon material is obtained. from f...

Embodiment 2

[0082] Compared with Example 1, the only difference is that the particle size of the template is changed, specifically:

[0083] 5 kg of starch, 5 kg of 500nm SiO 2 Add the template dispersion, 30 grams of iron acetate and 50 grams of sodium dodecylsulfonate into 10L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, and pulverize the dried slurry Afterwards, carbonize in a carbonization furnace at 1200°C for three hours under an argon atmosphere; the carbonized product is washed with 10M sodium hydroxide solution at a temperature of 100°C to remove SiO 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then the carbon material was dried, mixed with 1 kg of sublimated sulfur powder and ball-milled evenly, and then heat treated in an argon atmosphere; the heat treatment temperature was 650°C, the time was 3 hours, and the heating rate was 5°C / min. A locally graphitized thiabridized porous carbon material with ...

Embodiment 3

[0086] Compared with Example 1, change the particle size of the template and the temperature of carbonization, specifically:

[0087] 5 kg of starch, 5 kg of 150nm SiO 2 Add the template dispersion, 30 grams of iron acetate and 50 grams of sodium dodecylsulfonate into 10L of deionized water, stir at 80°C for 5 hours, dry the slurry at 120°C, and pulverize the dried slurry Finally, carbonize in a carbonization furnace at 800°C for three hours under an argon atmosphere; the carbonized product is washed to remove SiO with 10M sodium hydroxide solution at a temperature of 100°C. 2 Template; wash repeatedly with deionized water until the pH of the washing solution is neutral. Then the carbon material was dried, mixed with 1 kg of sublimated sulfur powder and ball-milled evenly, and then heat treated in an argon atmosphere; the heat treatment temperature was 650°C, the time was 3 hours, and the heating rate was 5°C / min. A locally graphitized thiabridized porous carbon material wit...

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Abstract

The invention relates to the field of lithium-sulfur battery materials, and particularly provides an iron sulfide@sulfur hybrid porous carbon positive electrode precursor material which is porous carbon with a through hole structure and composed of a plurality of template etching holes. A carbon skeleton of the porous carbon is sulfur-hybridized disordered carbon; and active particles are distributed in the carbon skeleton in an in-situ dispersion manner, wherein the active particles comprise graphitized carbon and iron sulfide embedded in the graphitized carbon in situ. The invention also provides preparation of the provided material and application of the material in a lithium-sulfur battery. The material provided by the invention has good specific capacity, rate and cycle performance inthe lithium-sulfur battery.

Description

technical field [0001] The invention relates to the field of battery electrode material preparation, in particular to a lithium-sulfur battery cathode material. Background technique [0002] Among the state-of-the-art energy storage devices, lithium-sulfur batteries are promising candidates for next-generation batteries due to their high theoretical energy density (2600 Wh / kg), low-cost and environmentally friendly cathode material active materials. Despite these advantages, lithium-sulfur batteries still face many challenges in the commercialization process, such as the poor conductivity of sulfur, large volume change (80%) of positive active material during charge and discharge, and slow reaction kinetics. The polysulfides produced during the charging and discharging process are dissolved in the electrolyte, and will shuttle from the positive electrode to the negative electrode in large quantities in an unconstrained, non-adsorbed, and non-catalytic conversion environment,...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B32/205C01G49/12H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00H01M4/02
CPCB82Y30/00B82Y40/00C01G49/12C01B32/05C01B32/205H01M4/38H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张治安郑景强赖延清王涛胜覃富荣洪波张凯李劼
Owner CENT SOUTH UNIV
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