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Lithium sulfur battery composite cathode material and preparation method thereof

A technology for composite positive electrode materials and lithium-sulfur batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited action sites, weak adsorption, and inability to effectively inhibit the dissolution of lithium polysulfide. The method is simple, The process is simple and the effect of mature technology

Active Publication Date: 2018-05-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the non-polar surface characteristics of carbon materials make the interaction sites between the surface of carbon materials and polar lithium polysulfides extremely limited, that is, the adsorption of carbon materials on lithium polysulfides is weak, and the adsorption of lithium polysulfides in the electrolyte cannot be effectively inhibited. to dissolve

Method used

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  • Lithium sulfur battery composite cathode material and preparation method thereof
  • Lithium sulfur battery composite cathode material and preparation method thereof
  • Lithium sulfur battery composite cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] A composite cathode material for a lithium-sulfur battery, specifically prepared according to the following steps:

[0025] Magnesium ferrite (MgFe 2 o 4 ) preparation:

[0026] Add 2.5 mmol of magnesium acetate tetrahydrate and 5 mmol of ferric nitrate nonahydrate to a mixed solvent consisting of 5 mL of deionized water and 5 mL of absolute ethanol, and stir until the added compound is completely dissolved; then weigh 5 g of poly(polyethylene oxide) with a molecular weight of 58,000. Vinylpyrrolidone was added to the above solution, stirred until completely dissolved to obtain a polymer viscous fluid; then heated and stirred at 80°C until the solvent evaporated completely, and ground to obtain a powder precursor; finally, the powder precursor was put into a porcelain ark, and the Calcined in a Furnace at 500°C for 5h with a heating rate of 2 o C / min, and finally cooled to room temperature to obtain magnesium ferrite;

[0027] The magnesium ferrite obtained above is...

Embodiment 2

[0032] A composite cathode material for a lithium-sulfur battery, specifically prepared according to the following steps:

[0033] Zinc ferrite (ZnFe 2 o 4 ) preparation:

[0034] Add 2.5 mmol of zinc acetate dihydrate and 5 mmol of ferric nitrate nonahydrate to a mixed solvent consisting of 5 mL of deionized water and 5 mL of absolute ethanol, and stir until the added compound is completely dissolved; then weigh 5 g of poly(polyethylene oxide) with a molecular weight of 58,000 Vinylpyrrolidone was added to the above solution, stirred until completely dissolved to obtain a polymer viscous fluid; then heated and stirred at 80°C until the solvent evaporated completely, and ground to obtain a powder precursor; finally, the powder precursor was put into a porcelain ark, and the Calcined at 600°C for 5 hours in a Furnace with a heating rate of 2 o C / min, and finally cooled to room temperature to obtain zinc ferrite;

[0035] Combination of zinc ferrite and sulfur element:

[0...

Embodiment 3

[0039] A composite cathode material for a lithium-sulfur battery, specifically prepared according to the following steps:

[0040] Copper ferrite (CuFe 2 o 4 ) preparation:

[0041] Add 2.5 mmol of copper acetate monohydrate and 5 mmol of ferric nitrate nonahydrate to a mixed solvent consisting of 5 mL of deionized water and 5 mL of absolute ethanol, and stir until the added compound is completely dissolved; then weigh 5 g of poly(polyethylene oxide) with a molecular weight of 58,000. Vinylpyrrolidone was added to the above solution, stirred until completely dissolved to obtain a polymer viscous fluid; then heated and stirred at 80°C until the solvent evaporated completely, and ground to obtain a powder precursor; finally, the powder precursor was put into a porcelain ark, and the Calcined in a Furnace at 500°C for 5h with a heating rate of 2 o C / min, and finally cooled to room temperature to obtain copper ferrite;

[0042] Composite the obtained copper ferrite with sulfur...

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Abstract

The invention relates to a lithium sulfur battery composite cathode material and a preparation method thereof. The composite cathode material is prepared by compounding ferrite with elemental sulfur.The ferrite is one of magnesium ferrite, zinc ferrite, copper ferrite or manganese ferrite. The preparation method includes: preparing a ferrite material by high temperature calcination method, and then conducting compounding with elemental sulfur by liquid phase method. The preparation method has a mature process and simple procedure, and is easy to acquire a high sulfur content composite cathodematerial. The lithium sulfur battery composite cathode material prepared by the invention utilizes the strong chemical adsorption effect of ferrite on polar lithium polysulfide, greatly inhibits thedissolution of lithium polysulfide in an ether electrolyte solution, accordingly slows down the shuttle effect, and then shows characteristics of high sulfur content, high sulfur utilization and highcycle stability.

Description

technical field [0001] The invention specifically relates to a lithium-sulfur battery composite cathode material and a preparation method thereof, belonging to the technical field of lithium-sulfur battery electrode materials. Background technique [0002] With the continuous development of new energy technology and the increasing demand for mobile power equipment and power vehicles, it is necessary to study lithium-ion batteries with high specific energy and long cycle characteristics. At present, the energy density of commercial lithium-ion batteries is low. This is because the electroactive material is generally a transition metal oxide, which has a large electrochemical formula, and the number of electrons transferred by the electrode reaction is small, so it is difficult to increase the energy density of the battery. For this reason, the use of multi-electron reactions and lightweight cathode materials is conducive to the construction of high-energy-density battery syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5815H01M4/628H01M10/0525Y02E60/10
Inventor 高学平李国然张泽刘胜
Owner NANKAI UNIV
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