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A kind of sulfide-carbon in situ composite material, electrode and its preparation method and battery

An in-situ composite material and in-situ composite technology, which is applied in the field of sulfide-carbon in-situ composite materials, electrodes and their preparation, can solve the problem of mechanical ball milling that is difficult to combine sulfide and carbon support at the microscopic scale, and achieve improvement Charge-discharge cycle performance, the effect of overcoming the low conductivity of the product, and wide application prospects

Active Publication Date: 2022-03-15
杭州怡莱珂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mechanical ball milling is difficult to ensure that sulfide and carbon support can form a microscopic combination. These technical defects make carbon-based magnesium sulfide and carbon-based lithium sulfide have not been commercially applied in the field of electrode materials.

Method used

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  • A kind of sulfide-carbon in situ composite material, electrode and its preparation method and battery
  • A kind of sulfide-carbon in situ composite material, electrode and its preparation method and battery

Examples

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preparation example Construction

[0033] The present invention provides above-mentioned sulfide-carbon in situ composite material preparation method, it comprises the following steps:

[0034] 1) Dissolving the sulfide precursor in an alcoholic solvent to obtain a solution with a concentration of 10% to 20%.

[0035] The sulfide is one of magnesium sulfide and lithium sulfide.

[0036] The sulfide precursor is one of magnesium thiocyanate and lithium thiocyanate. They are easily soluble in alcohol. Because ethanol has low toxicity and suitable boiling point, ethanol is preferably recommended.

[0037] Magnesium thiocyanate and lithium thiocyanate usually contain water of crystallization, and alcoholic solvents also often contain a small amount of water. It is recommended to add granular calcium oxide to the solvent to remove water, and then filter to remove the solid phase to obtain the sulfide precursor Anhydrous solution. The purpose of removing moisture is to prevent magnesium thiocyanate and lithium thi...

Embodiment 1

[0089] 1) Weigh 10 grams of magnesium thiocyanate and 90 grams of anhydrous methanol, stir until completely dissolved, and obtain a solution with a concentration of 10%.

[0090] 2) Weigh 15 grams of polystyrene powder and 85 grams of xylene, and stir until completely dissolved to obtain a solution with a concentration of 10%.

[0091] 3) The two solutions are mixed and stirred to obtain a mixed solution.

[0092] 4) Heat the mixed solution while stirring to evaporate the solvent to nearly dryness, then move the material into a crucible and put it into a vacuum oven, and heat it to 120°C after vacuuming until the solvent is completely evaporated to obtain a solid phase mixture.

[0093]5) Put the obtained solid-phase mixture and the crucible into a muffle furnace, heat to 600°C under the protection of high-purity nitrogen or argon, keep the temperature at a constant temperature for 4 hours, and after cooling to room temperature, take out the crucible, and grind the product to ...

Embodiment 2

[0095] 1) Weigh 20 grams of lithium thiocyanate and 80 grams of absolute ethanol, and stir until completely dissolved to obtain a solution with a concentration of 20%.

[0096] 2) Weigh 20 grams of polystyrene powder and 80 grams of toluene, stir until completely dissolved, and obtain a solution with a concentration of 20%.

[0097] 3) The two solutions are mixed and stirred to obtain a mixed solution.

[0098] 4) Heat the mixed solution while stirring to evaporate the solvent to nearly dryness, then move the material into a crucible and put it into a vacuum oven, and heat it to 100°C after vacuuming until the solvent is completely evaporated to obtain a solid phase mixture.

[0099] 5) Put the obtained solid-phase mixture and the crucible into a muffle furnace, heat to 450°C under the protection of high-purity nitrogen or argon, keep the temperature at a constant temperature for 6 hours, and after cooling to room temperature, take out the crucible, and grind the product to ob...

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Abstract

The invention discloses a sulfide-carbon in-situ composite material, an electrode, a preparation method thereof, and a battery. The composite material is a uniform mixture composed of microcrystalline sulfide and carbon particles embedded. In the preparation method, the sulfide precursor and the carbon precursor are prepared into a completely miscible solution, and the precursors are sequentially precipitated by heating and distillation, and the crystalline structure is maintained under the dispersion of the residual solution to form a mosaic structure. After the solvent is evaporated to dryness, a solid-phase mixture of the two precursors is obtained, and after pyrolysis, a sulfide-carbon in-situ composite material is obtained. The composite material powder can be prepared into an electrode based on sulfide-carbon in-situ composite material after bonding, secondary molding and carbonization. This electrode has the advantages of large specific surface area, high electrochemical activity and high conductivity. Using this electrode as an anode, paired with a metal cathode, and using the corresponding electrolyte solution together, can obtain sulfur-magnesium and sulfur-lithium batteries, which have broad application prospects in the field of high-capacity batteries.

Description

technical field [0001] The invention belongs to the field of energy, and in particular relates to a sulfide-carbon in-situ composite material, an electrode, a preparation method thereof, and a battery. Background technique [0002] Magnesium sulfide and lithium sulfide are anode materials with great application potential. They have the advantages of high energy density and low overall cost. However, the sulfide anode material and the polysulfides formed after charging have poor conductivity, and there are problems such as volume expansion, resulting in a short charge-discharge cycle life, making it difficult for the battery performance to reach the theoretical value. These shortcomings have prevented it from being widely used so far. [0003] Combining sulfide with carbon through doping, coating and other methods can improve the conductivity of sulfide and polysulfide to electrons and ions. The previous preparation method is to mix sulfide (or precursor) and carbon black (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/136H01M4/1397H01M10/052
CPCH01M4/5815H01M4/625H01M4/628H01M4/136H01M4/1397H01M10/052H01M2004/027Y02E60/10
Inventor 叶瑛夏天张楚青张平萍
Owner 杭州怡莱珂科技有限公司
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