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Lithium sulfur battery positive electrode material and preparation method thereof

A lithium-sulfur battery and cathode material technology, which is applied in battery electrodes, lithium storage batteries, positive electrodes, etc., can solve the problems of unsatisfactory electrical properties of cathode materials, reduce shuttle effect, high Coulomb efficiency, and ensure electrical conductivity and mechanical strength. Effect

Inactive Publication Date: 2018-06-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of unsatisfactory electrical properties of the existing lithium-sulfur battery cathode materials, the present invention provides a lithium-sulfur battery cathode material, which aims to improve the electrical properties of the cathode material

Method used

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  • Lithium sulfur battery positive electrode material and preparation method thereof
  • Lithium sulfur battery positive electrode material and preparation method thereof
  • Lithium sulfur battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] MoS 2 Preparation of @CNTs-S and Performance Test of Li-S Batteries Assembled

[0056] Step (1): Spongy molybdenum disulfide-modified carbon nanotubes (MoS 2 Preparation of @CNTs)

[0057] S1, 12mg (NH 4 ) 6 Mo 7 o 24 4H 2 O (0.068mmoL; 1eqv.) and 12.9mg of thiourea (2.5eqv.) were dissolved in 25ml of pure water, and the two were mixed while stirring;

[0058] S2. Add 100 mg of carbon nanotubes to the mixed solution obtained in step S1, and stir for 12 hours;

[0059] S3. Transfer the solution obtained in step S2 to a 100ml stainless steel reaction kettle, place the stainless steel reaction kettle in an oven, and keep it at 180°C for 12h;

[0060] S4, filter the solution obtained in step S3, wash, and dry to obtain spongy molybdenum disulfide-modified carbon nanotubes (MoS 2 @CNTs);

[0061] Step (2): Sponge-like molybdenum disulfide-modified carbon nanotubes loaded with sulfur (MoS 2 @CNTs-S)

[0062] Sulfur powder and MoS 2 @CNTs were mixed and ground at ...

Embodiment 2

[0066] WS 2 Preparation of @CNTs-S and Performance Test of Li-S Batteries Assembled

[0067] Step (1): Tungsten disulfide modified carbon nanotubes (WS 2 Preparation of @CNTs)

[0068] S1, 21mg (NH 4 ) 10 W 12 o 41 ·xH 2 O (0.083mmoL; 1eqv.) and 15.7mg of thiourea (2.5eqv.) were dissolved in 50ml of pure water, and the two were mixed while stirring;

[0069] S2. Add 150 mg of carbon nanotubes to the mixed solution obtained in step S1, and stir for 8 hours;

[0070] S3. Transfer the solution obtained in step S2 to a 150ml stainless steel reaction kettle, place the stainless steel reaction kettle in an oven, and keep it at 160°C for 10h;

[0071] S4, the solution obtained in step S3 is filtered, washed, and dried to obtain tungsten disulfide-modified carbon nanotubes (WS 2 @CNTs);

[0072] Step (2): the molybdenum disulfide-modified carbon nanotubes loaded with sulfur (WS 2 @CNTs-S)

[0073] Combine sulfur powder with WS 2 @CNTs were mixed and ground at a mass ratio...

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Abstract

The invention belongs to the field of lithium sulfur battery material, and in particular, relates to a lithium sulfur battery positive electrode material including a host material and elemental sulfurloaded on the host material; the host material includes carbon nanotubes and a transition metal sulfide compounded on the carbon nanotubes. The invention also discloses a preparation method and an application of the positive electrode material. According to the lithium sulfur battery positive electrode material, a strategy of adding the transition metal sulfide is adopted for reducing a back-and-forth shuttling effect; secondly, the carbon nanotubes are added to prevent the collapse of an electrode structure; the positive electrode material has excellent electrochemical performance, and is applied to a lithium sulfur battery to show high initial discharge capacity, high coulombic efficiency and high rate performance.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material and a preparation method thereof, belonging to the technical field of preparation of lithium-sulfur battery materials. Background technique [0002] Compared with the existing lithium-ion batteries, lithium-sulfur batteries have higher energy density (2600W h kg -1 ) and specific capacity (1675mA h g -1 ), and sulfur reserves are abundant, cheap and easy to obtain, and environmentally friendly. Therefore, lithium-sulfur batteries have the greatest potential to become a new generation of energy storage devices. Despite the many advantages of lithium-sulfur batteries, there are some challenges to commercialize them. First, the poor conductivity of sulfur and the discharge product lithium sulfide lead to low cathode utilization. Second, highly soluble intermediates (lithium polysulfides), which cause rapid loss of active species and unfavorable shuttling effects. Third, the large volum...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 刘又年刘颖马路李亚娟
Owner CENT SOUTH UNIV
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