Ternary metal oxide composite MXene material and application thereof to lithium-sulfur batteries

A ternary metal and composite material technology, applied in the field of material chemistry, can solve the problems of specific capacitance and capacitance to be improved, and achieve the effect of large volume expansion buffer space, multiple buffer spaces, and increased stability

Inactive Publication Date: 2019-02-01
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

However, the current pure MXene material is used as an electrode material, and the specific capacitance and capacitance still need to be improved.

Method used

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  • Ternary metal oxide composite MXene material and application thereof to lithium-sulfur batteries
  • Ternary metal oxide composite MXene material and application thereof to lithium-sulfur batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of MXene:

[0027] 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 80°C, stir magnetically for 18 hours, then centrifuge to obtain the product, and use deionized Wash with water 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 For -OH, -F and other functional groups.

[0028] (2) Preparation of NiCo 2 o 4 -MXene composites:

[0029] Take 1.5g of MXene prepared in step (1), 0.8g of nickel acetate, and 0.8g of cobalt acetate, put them in 120mL of deionized water, stir well, then transfer the mixed solution to a 200mL reaction kettle, raise the temperature to 160°C, and keep it warm for 8 Hour. After cooling in the oven, the product was obtained by centrifugation, washed repeatedly with deionized water, and dried in an oven at 60°C for 12 h...

Embodiment 2

[0035] (1) Preparation of MXene:

[0036] 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 Wash with water 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 For -OH, -F and other functional groups.

[0037] (2) Preparation of NiCo 2 o 4 -MXene composites:

[0038] Take 1 g of MXene prepared in step (1), 0.5 g of nickel acetate, and 0.5 g of cobalt acetate, put them in 100 mL of deionized water, stir well, then transfer the mixed solution to a 200 mL reaction kettle, raise the temperature to 150 ° C, and keep it warm for 6 hours. After cooling in the oven, the product was obtained by centrifugation, washed repeatedly with deionized water, and dried in an oven at 60°C for...

Embodiment 3

[0042] (1) Preparation of MXene:

[0043] 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 Wash with water 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 . The obtained MXene material can be Ti 3 C 2 T x ,T x For -OH, -F and other functional groups.

[0044] (2) Preparation of NiCo 2 o 4 -MXene composites:

[0045] Take 2g of MXene prepared in step (1), 1g of nickel acetate, and 1g of cobalt acetate, put them in 150mL of deionized water, stir well, then transfer the mixed solution to a 200mL reaction kettle, raise the temperature to 180°C, and keep it warm for 12 hours. After cooling in the oven, the product was obtained by centrifugation, washed repeatedly with deionized water, and dried in an oven at 60°C ...

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Abstract

The invention relates to a ternary metal oxide composite MXene material for positive electrode materials of lithium-sulfur batteries and a preparation method of the ternary metal oxide composite MXenematerial. The method includes: etching in hydrofluoric acid solution to obtain MXene, preparing a NiCo2O4 composite MXene material through hydrothermal reaction, and preparing a sulfur-NiCo2O4-MXenecomposite material by sulfur doping through ball milling and hot melting, namely the ternary metal oxide composite MXene material is obtained. A two-dimensional lamellar structure of MXene is beneficial to quick interlamination diffusion of electrolyte ions to achieve an excellent rate performance, and more spaces are provided for storage of active substances, so that electrode stability is improved. By introduction of a ternary metal oxide NiCo2O4, lithium polysulfide adsorption of surface polar active sites is promoted, active substance sulfur utilization rate is increased, MXene expansion can be realized, and a large volume expansion buffer space and excellent electrochemical performances are achieved.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery cathode material with high specific capacity, in particular to a method for preparing a ternary metal oxide composite MXene composite material through a hydrothermal reaction, and belongs to the field of material chemistry. Background technique [0002] With the continuous development of science and technology and the improvement of people's living standards, people have put forward higher requirements for the development of secondary lithium batteries, especially in high-performance electric vehicles, which urgently need extremely high energy storage and energy transmission systems. Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh g －1 ) and energy density (2600Wh·kg －1 ), which has been widely concerned by scholars at home and abroad. The special structure and electrochemical properties of sulfur make it widely used as anode material for batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/624H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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