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Sulfur-oxygen doped MXene-carbon nanotube composite material and application thereof in lithium-sulfur battery

A carbon nanotube and composite material technology, applied in lithium batteries, battery electrodes, nanotechnology and other directions, can solve the problems of lithium-sulfur battery discharge specific capacity decrease, battery cycle stability deterioration, and restricting lithium-sulfur battery performance, etc. Excellent rate performance, improved stability, and the effect of electrical conductivity

Active Publication Date: 2019-03-08
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generation of the "shuttle" effect directly leads to the loss of active materials and the corrosion of the lithium negative electrode, which makes the battery cycle stability worse.
In addition, the insulation of elemental sulfur and its final discharge products, and the large volume change of the positive electrode during charging and discharging will lead to a decrease in the discharge specific capacity of lithium-sulfur batteries, which restricts the improvement of lithium-sulfur battery performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of MXene:

[0029] Immerse the ground MAX phase ceramic powder in HF solution with a mass fraction of 40%, the mass ratio of ceramic powder to HF solution is 1:20, heat up to 60°C, stir magnetically for 18 hours, then centrifuge to obtain the product, and use deionized water Wash until neutral, and dry in an oven at 70°C for 18 hours to obtain MXene. The MAX phase ceramic is Ti 3 AlC 2 . Get MXene material as Ti 3 C 2 T x (T x are -OH, -F and other functional groups).

[0030] (2) Preparation of MXene-carbon nanotube composites:

[0031] First prepare the catalyst, add 1.5g of cobalt acetate to 15mL of toluene solution, and ultrasonically mix for 20 minutes to make it uniform and ready for use. Spread the MXene powder prepared in step (1) evenly in a porcelain boat, place it in a tube furnace, and raise the temperature to 700°C in a nitrogen atmosphere (flow rate of 200mL / min), and use a peristaltic pump after heating to the set temperature Pas...

Embodiment 2

[0039] (1) Preparation of MXene:

[0040] Immerse the ground MAX phase ceramic powder in HF solution with a mass fraction of 30%, the mass ratio of ceramic powder to HF solution is 1:30, heat up to 50°C, stir magnetically for 12 hours, then centrifuge to obtain the product, and use deionized water Wash until neutral, and dry in an oven at 60°C for 12 hours to obtain MXene. The MAX phase ceramic is Ti 3 AlC 2 . Get MXene material as Ti 3 C 2 T x (T x are -OH, -F and other functional groups).

[0041] (2) Preparation of MXene-carbon nanotube composites:

[0042] First prepare the catalyst, add 1g of cobalt acetate to 10mL of toluene solution, and mix it uniformly by ultrasonication for 10 minutes. Spread the MXene powder prepared in step (1) evenly in a porcelain boat, place it in a tube furnace, and raise the temperature to 600°C in a nitrogen atmosphere (flow rate 100mL / min), and use a peristaltic pump after heating to the set temperature Pass the catalyst into it, t...

Embodiment 3

[0048] (1) Preparation of MXene:

[0049] Immerse the ground MAX phase ceramic powder in HF solution with a mass fraction of 50%, the mass ratio of ceramic powder to HF solution is 1:10, heat up to 90°C, stir magnetically for 24 hours, then centrifuge to obtain the product, and use deionized water Wash until neutral, and dry in an oven at 80°C for 24 hours to obtain MXene. The MAX phase ceramic is Ti 3 AlC 2 . Get MXene material as Ti 3 C 2 T x (T x are -OH, -F and other functional groups).

[0050] (2) Preparation of MXene-carbon nanotube composites:

[0051] First prepare the catalyst, add 2g of cobalt acetate into 20mL of toluene solution, and mix it uniformly by ultrasonication for 30 minutes. Spread the MXene powder prepared in step (1) evenly in a porcelain boat, place it in a tube furnace, and raise the temperature to 800°C in a nitrogen atmosphere (flow rate 300mL / min), and use a peristaltic pump after heating to the set temperature Pass the catalyst into it,...

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Abstract

The invention relates to a high-specific capacity lithium-sulfur battery positive electrode material and preparation method thereof. The lithium-sulfur battery positive electrode material is a sulfur-oxygen doped MXene-carbon nanotube composite material. The composite material is prepared according to the steps of taking MAX-phase ceramic powder as a raw material, preparing an MXene-carbon nanotube composite material by a vapor deposition method, obtaining an oxygen-doped MXene-carbon nanotube by hydrogen peroxide immersion, and performing sulfur doping by a ball-milling and hot melting method. When the sulfur-oxygen doped MXene-carbon nanotube composite material is used as a positive electrode material applied to the lithium-sulfur battery, the sulfur-oxygen doped MXene-carbon nanotube composite material has the characteristics of extremely high conductivity and large surface area, a discharging intermediate product lithium polysulfide can be effectively absorbed, and a shuttle effectis reduced.

Description

technical field [0001] The invention relates to a high specific capacity lithium-sulfur battery cathode material and a preparation method thereof, in particular to an MXene-doped carbon nanotube prepared by a vapor phase deposition method, and then soaked in hydrogen peroxide to obtain an oxygen-doped MXene-carbon The nanotubes are prepared by doping sulfur with ball milling and hot melting methods to obtain sulfur-oxygen doped MXene-carbon nanotube composite lithium-sulfur battery cathode materials, belonging to the field of material chemistry. Background technique [0002] Lithium-ion secondary batteries have become the preferred power source for various electronic products due to their advantages such as high operating voltage, high energy density, long life and no memory effect. With the further miniaturization of electronic equipment and the rapid development of electric vehicles and large-scale energy storage power stations, people have put forward higher requirements ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/587H01M4/625H01M10/052Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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