Manganese dioxide nanosheet coated carbon/sulphur compound, preparation method and application thereof

A manganese dioxide and composite technology, which is applied in electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of sulfur extraction, poor electrical performance, battery performance degradation, etc., achieve good in-situ composite, improve electronic The effect of transfer speed, simple preparation method

Inactive Publication Date: 2016-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems that the existing lithium-sulfur battery anode material sulfur is easily detached from the carbon material, resulting in battery performance degradation and poor electrical performance, the invention provides a carbon / sulfur (MnO2) coated with manganese dioxide nanosheets. 2 @C / S) composite approach aimed at improving the electrochemical performance of materials

Method used

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  • Manganese dioxide nanosheet coated carbon/sulphur compound, preparation method and application thereof
  • Manganese dioxide nanosheet coated carbon/sulphur compound, preparation method and application thereof
  • Manganese dioxide nanosheet coated carbon/sulphur compound, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Step (1): Preparation of carbon / sulfur complex (C / S complex)

[0080] Mix 0.7 g of acetylene black and 3.1 g of sublimed sulfur and mill for 15 minutes. Then the mixed powder was sealed in a vacuum quartz tube and heated at 150°C for 6 hours under nitrogen protection. During the melting process, the S powder will melt into a liquid state and be embedded in a specific cavity of acetylene black. After cooling to normal temperature, an acetylene black / sulfur composite is obtained.

[0081] Step (2): Preparation of acetylene black / sulfur composite coated with manganese dioxide nanosheets

[0082] Disperse 0.805g of acetylene black / sulfur complex in 170ml of distilled water and stir slowly for 1h to make it fully dispersed. Dissolve 0.3 g of potassium permanganate in 60 ml of water and stir well. Pour the potassium permanganate solution into the above mixed solution, and heat to 60°C, and continue to stir at a rotation speed of 300 r / min until the color of the solution changes ...

Embodiment 2

[0090] Step (1): Preparation of Acetylene Black / Sulfur Complex

[0091] Mix 2.0 g of acetylene black and 10.5 g of sulfur and mill for 20 minutes. Then the mixed powder was sealed in a vacuum quartz tube and heated at 200°C for 6 hours under nitrogen protection. During the melting process, sulfur will melt into a liquid state and become embedded in the acetylene black. After cooling to normal temperature, an acetylene black / sulfur composite is obtained.

[0092] Step (2): Preparation of acetylene black / sulfur composite coated with manganese dioxide nanosheets

[0093] Disperse 2.5g of acetylene black / sulfur complex in 500ml of distilled water and stir slowly for 0.5h to make it fully dispersed. Dissolve 1.0 g of lithium permanganate in 200 ml of water and stir evenly. Drop the lithium permanganate solution into the above mixed solution, and heat to 80° C., and continue stirring at a rotation speed of 200 r / min until the color of the solution changes from purple to black brown. T...

Embodiment 3

[0097] Step (1): Preparation of conductive carbon black / sulfur composite

[0098] 3.0 g of acetylene black and 17.2 g of sulfur were mixed and milled for 20 minutes. Then the mixed powder was sealed in a vacuum quartz tube and heated at 180°C for 10 hours under nitrogen protection. During the melting process, sulfur will melt into a liquid state and be embedded in the conductive carbon black. After cooling to room temperature, a conductive carbon black / sulfur composite is obtained.

[0099] Step (2): Preparation of conductive carbon black / sulfur composite coated with manganese dioxide nanosheets

[0100] Disperse 2.5g of conductive carbon black / sulfur composite and 0.6g of manganese sulfate monohydrate in 500ml of distilled water, and stir slowly for 1.0h to make them fully dispersed. Dissolve 0.5 g of potassium permanganate in 100 ml of water and stir well. Drop the potassium permanganate solution into the above mixed solution, and heat to 60°C, and continue to stir at a rotatio...

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Abstract

The invention discloses a method for preparing a manganese dioxide nanosheet coated carbon/sulphur (MnO2@C/S) compound. The method comprises the following steps: firstly heating and melting a carbon material and sulphur simple substance to obtain a carbon/sulphur compound, then adding permanganate solution into aqueous phase dispersion liquid of the carbon/sulphur compound, heating, stirring, reacting, then carrying out solid-liquid separation, washing, and drying, so that the manganese dioxide nanosheet coated carbon/sulphur compound is obtained. Besides, the invention also discloses the manganese dioxide nanosheet coated carbon/sulphur compound obtained by adopting the method and application thereof. When the manganese dioxide nanosheet coated carbon/sulphur compound is applied to a lithium sulphur battery cathode material, and initial discharge capacity, cycle performance and rate capability of the obtained battery are respectively greatly improved.

Description

Technical field [0001] The invention belongs to the field of energy storage material preparation; specifically relates to a carbon / sulfur (MnO 2 @C / S) new lithium-sulfur battery cathode material, preparation and application. Background technique [0002] With the development and breakthrough of technology in the field of transistor materials, the electronics industry has increasingly higher requirements for the discharge performance and sustainability of power supplies. As a secondary battery, lithium-sulfur battery has a theoretical energy density of up to 2600mA·h·g -1 , Much higher than the traditional lithium-ion battery, it is extremely promising to become the main part of the next-generation energy storage system. In addition, the sulfur used in lithium-sulfur batteries has many advantages, such as abundant reserves in nature, non-toxic and harmless, low cost, and environmentally friendly. [0003] Despite the numerous advantages, the widespread commercialization of lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021Y02E60/10
Inventor 刘又年马路侯佳楠张枝枫李亚娟
Owner CENT SOUTH UNIV
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