Preparation method of carbon nanotube-lithium sulfide-carbon composite material

A carbon composite material, carbon nanotube technology, applied in lithium batteries, electrochemical generators, electrical components, etc., can solve the problems of low electron/ion conductivity, easy to cause shuttle effect, limit practical application, etc., to achieve electrical conductivity Good, inhibiting dissolution and diffusion, and the effect of tight coating

Active Publication Date: 2017-05-31
CENT SOUTH UNIV
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Problems solved by technology

However, the material has low electronic / ionic conductivity, and the dissolution of reaction intermediate polysulfides in the electrolyte can easily trigger the shuttle effect, resulting in a sharp decline in capacity, which limits its practical application in lithium-sulfur batteries.
Most of the current modifications focus on carbon-coating the material, improving the conductivity of the material, inhibiting the shuttle effect of polysulfides and alleviating the volume effect of the material, but the effect is not ideal.

Method used

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  • Preparation method of carbon nanotube-lithium sulfide-carbon composite material
  • Preparation method of carbon nanotube-lithium sulfide-carbon composite material
  • Preparation method of carbon nanotube-lithium sulfide-carbon composite material

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Embodiment 1

[0023] This embodiment includes the following steps:

[0024] (1) Dissolve 0.002mol of sublimated sulfur powder in 200ml of toluene at a temperature of 60°C to form a uniform and transparent solution A;

[0025] (2) Disperse 3 mg of carbon nanotubes in 4 ml of tetrahydrofuran solution of lithium triethylborohydride with a concentration of 1 mol / L, and ultrasonically disperse for 10 min to make them uniformly dispersed in the solution to form suspension B;

[0026] (3) Add solution A to suspension B, stir for 1 min, stir, heat and evaporate to dryness to form carbon nanotube-Li 2 S powder; heating temperature is 100°C;

[0027] (4) The carbon nanotube-Li obtained in step (3) 2 Under the protection of argon, the temperature of S powder was raised to 450°C for 0.5h, and then acetylene gas was introduced to conduct vapor phase deposition of carbon. The deposition time was 0.5h, and then cooled to room temperature to obtain carbon nanotube-Li 2 S-C composites; controlling the qu...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] (1) Dissolve 0.002mol of sublimated sulfur in 2ml of toluene at a temperature of 110°C to form a uniform and transparent solution A;

[0036] (2) Disperse 4.6 mg of carbon nanotubes in 200 ml of tetrahydrofuran solution of lithium triethylborohydride with a concentration of 0.1 mol / L, ultrasonically disperse for 4 hours to form suspension B;

[0037] (3) Add solution A to suspension B, stir for 2 hours, stir, heat and evaporate to dryness to form carbon nanotube-Li 2 S powder; heating temperature is 150°C;

[0038] (4) Heat the product obtained in step (3) under the protection of argon to 600°C for 10 hours, then pass in acetylene gas for vapor deposition of carbon, the deposition time is 24 hours, and the quality of vapor deposition carbon is controlled to be carbon nanotube- Li 2 20wt% of the total mass of S-C, and then cooled to room temperature to obtain carbon nanotube-Li 2 S-C composites.

[0039] Embodimen...

Embodiment 3

[0041] This embodiment includes the following steps:

[0042] (1) Dissolve 0.002mol of sublimated sulfur in 15ml of toluene at a temperature of 90°C to form a uniform and transparent solution A;

[0043] (2) Disperse 9.2 mg of carbon nanotubes in 10 ml of a tetrahydrofuran solution of lithium triethylborohydride at a concentration of 1 mol / L, and disperse it ultrasonically for 4 hours to form a suspension B;

[0044] (3) Add solution A to suspension B, stir for 1 hour, stir, heat and evaporate to dryness to form carbon nanotube-Li 2 S powder; heating temperature is 120°C;

[0045] (4) Heat the product obtained in step (3) under the protection of argon to 550°C for 1 hour, then pass in acetylene gas for vapor deposition of carbon, the deposition time is 3 hours, and the content of vapor deposition carbon is controlled to be carbon nanotube- Li 2 2wt% of the total S-C content, then cooled to room temperature, CNT-Li 2 S-C composites.

[0046] Embodiment 3 gained carbon nano...

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Abstract

The invention relates to a preparation method of a carbon nanotube-lithium sulfide-carbon composite material. The preparation method comprises the following steps: dissolving sublimed sulfur powder in anhydrous methylbenzene to form a transparent solution A; performing ultrasonic dispersion on carbon nanotubes in a lithium triethylborohydride tetrahydrofuran solution to form a suspension B; adding the solution A into the suspension B to obtain a carbon nanotube-Li2S composite material suspension, and heating to evaporate the solvent so as to obtain carbon nanotube-Li2S composite material powder; and finally, putting the carbon nanotube-Li2S material in an inert atmosphere, and performing chemical vapor deposition to form the carbon nanotube-Li2S-C composite material. The carbon nanotube-lithium sulfide-carbon composite material prepared by the invention has favorable electric conductivity and high coating tightness, can improve the electric conductivity of a Li2S electrode, effectively inhibits dissolution and dispersion of polysulfide in an electrolyte, and increases the sulfur utilization ratio; and meanwhile, the porous structure of the carbon nanotubes has a cushioning effect on volume expansion and shrinkage of an sulfur electrode in the charge/discharge process.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a carbon nanotube-Li 2 Preparation method of S-carbon composite material. Background technique [0002] With the advancement of my country's new energy vehicle strategy, there is an urgent need for batteries with higher capacity and higher energy density. However, the current research and development of lithium-ion battery cathode materials is progressing slowly. A lithium-sulfur battery is a secondary battery that uses metallic lithium as the negative electrode and elemental sulfur or sulfur-based composite materials as the positive electrode. In theory, lithium reacts completely with sulfur to form Li 2 S, can realize 2-electron reaction, its theoretical specific capacity is as high as 1675mAh / g, the theoretical energy density of the secondary battery system constructed of sulfur and metal lithium reaches 2600Wh / kg, the actual energy density can reach 300Wh / kg at present, and the mass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/052H01M2220/20Y02E60/10
Inventor 郑俊超汤林波张宝肖彬孙楠童汇喻万景张佳峰
Owner CENT SOUTH UNIV
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