A sulfur/porous carbon-coated carbon nanotube composite positive electrode material for lithium-sulfur batteries and its preparation method

A composite positive electrode material and nanotube composite technology, which is applied in nanotechnology for materials and surface science, battery electrodes, lithium batteries, etc., can solve problems such as low energy density, low sulfur loading, and small specific capacity of sulfur electrodes , to achieve the effect of large sulfur load, high utilization rate and inhibition of dissolution

Active Publication Date: 2016-04-06
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problems that the carbon nanotube / sulfur composite positive electrode material in the prior art generally has low sulfur loading, which results in small sulfur electrode specific capacity and low energy density, and aims to provide a high positive electrode active material. Sulfur utilization rate, sulfur / porous carbon-coated carbon nanotube composite cathode material that can improve the cycle performance of lithium-sulfur batteries

Method used

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  • A sulfur/porous carbon-coated carbon nanotube composite positive electrode material for lithium-sulfur batteries and its preparation method
  • A sulfur/porous carbon-coated carbon nanotube composite positive electrode material for lithium-sulfur batteries and its preparation method
  • A sulfur/porous carbon-coated carbon nanotube composite positive electrode material for lithium-sulfur batteries and its preparation method

Examples

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Effect test

Embodiment 1

[0025] Add 1.0 g of single-walled carbon nanotubes (20 nm in diameter and 1 μm in length) to 200 mL of dopamine aqueous solution with a concentration of 5 mg / mL, and ultrasonicate for 2 h at room temperature to obtain a uniformly dispersed carbon nanotube suspension, and then continue to Under magnetic stirring, NaOH solution with pH=9 was slowly dropped into the suspension, and after mechanically stirring for 10 hours at room temperature, the product was washed three times with deionized water and ethanol to remove impurities and dopamine monolayers on the surface of the product. body, and polydopamine-coated carbon nanotube composites were obtained. A certain amount of polydopamine-coated carbon nanotube composite material was transferred to a tube furnace, and under the protection of inert gas nitrogen, the temperature was raised from room temperature to 800 °C at a heating rate of 10 °C / min, and kept for 10 h. After carbonization, a porous carbon-coated carbon nanotube com...

Embodiment 2

[0029] Add 0.8 g of multi-walled carbon nanotubes (100 nm in diameter and 5 μm in length) to 200 mL of dopamine aqueous solution with a concentration of 0.5 mg / mL, and ultrasonicate for 1 h at room temperature to obtain a uniformly dispersed carbon nanotube suspension, and then Under continuous magnetic stirring, slowly drop NaOH solution with pH=8 into the suspension, and after mechanically stirring for 8 hours at room temperature, wash the product three times with deionized water and ethanol to remove impurities and dopamine on the surface of the product. Monomer to obtain polydopamine-coated carbon nanotube composite material. A certain amount of polydopamine-coated carbon nanotube composite material was transferred to a tube furnace, and under the protection of inert gas nitrogen, the temperature was raised from room temperature to 1000 ° C at a heating rate of 5 ° C / min, and kept for 5 h. After carbonization, a porous carbon-coated carbon nanotube composite carbon mater...

Embodiment 3

[0031] Add 1.5g of single-walled carbon nanotubes (10nm in diameter and 500nm in length) into 100mL of dopamine aqueous solution with a concentration of 10mg / mL, and ultrasonicate for 3 hours at room temperature to obtain a uniformly dispersed carbon nanotube suspension, and then continue to Under magnetic stirring, the KOH solution with pH=8 was slowly dropped into the suspension, and after mechanically stirring for 5 hours at room temperature, the product was washed three times with deionized water and ethanol to remove impurities and dopamine monolayers on the surface of the product. body, and polydopamine-coated carbon nanotube composites were obtained. A certain amount of polydopamine-coated carbon nanotube composite material was transferred to a tube furnace, and under the protection of inert gas nitrogen, the temperature was raised from room temperature to 1200 °C at a heating rate of 15 °C / min, and kept for 8 hours. After carbonization, a porous carbon-coated carbon na...

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Abstract

The invention discloses a sulfur / porous carbon-coated carbon nano tube compound positive material for a lithium-sulfur battery and a preparation method thereof. The lithium-sulfur battery compound positive material is formed by compounding a carbon nano tube compound carbon material coated with porous carbon with a micro-nano structure and elemental sulfur. The preparation method comprises the following steps of: firstly coating poly-dopamine on the surface of a carbon nano tube; then carrying out high temperature carbonization, and compounding with the elemental sulfur to obtain the compound positive material. The preparation method disclosed by the invention has the advantages of easiness for operation and low cost. The prepared lithium-sulfur battery compound positive material is high in sulfur utilization ratio and greatly enhances the cycle property of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to a sulfur / porous carbon-coated carbon nanotube composite cathode material for lithium-sulfur batteries and a preparation method thereof, belonging to the field of new energy. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronics, electric vehicles, and plug-in hybrid electric vehicles, there is an urgent need to develop batteries with higher energy density. As the specific capacity of lithium-ion battery cathode materials is limited, it is difficult to further increase the energy density of lithium-ion batteries. At the same time, increasing the energy density by increasing the voltage platform of the cathode material will bring safety problems. Changing the cathode material from the "deintercalation mechanism" to the "conversion reaction chemical mechanism" is expected to obtain materials with high specific capacity and specific energy. Elemental sulfur is one of the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62B82Y30/00
CPCB82Y30/00H01M4/364H01M4/625H01M10/052Y02E60/10
Inventor 张治安李强包维斋周成坤赖延清张凯
Owner CENT SOUTH UNIV
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