Preparation method of sulfur-doped ReSe2/MXene composite material

A composite material and sulfur-doped technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of limited development, easy agglomeration, poor conductivity, etc., to improve potassium storage performance, increase specific surface area, The effect of increasing the layer spacing

Inactive Publication Date: 2020-12-25
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a negative electrode material, it has excellent electrochemical performance, but its development is severely limited by defects such as poor conductivity and easy agglomeration.

Method used

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  • Preparation method of sulfur-doped ReSe2/MXene composite material
  • Preparation method of sulfur-doped ReSe2/MXene composite material
  • Preparation method of sulfur-doped ReSe2/MXene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A sulfur-doped ReSe 2 The preparation method of / MXene composite material, comprises the following steps:

[0041] (1) Add 0.1mmol of ReSe 2 Nanoparticles, 10ml of N,N-dimethylformamide (DMF) and 5ml of ultrapure water were fully stirred and mixed to obtain a suspension;

[0042] (2) 0.1mmol of MXene (Ti 3 C 2 T x ) nanosheets, suspension, 0.06 mmol of sulfur powder and 15 ml of ultrapure water were mixed, treated in an ultrasonic cleaner with an ultrasonic frequency of 50 W for 0.5 h at 25 ° C, and then magnetically stirred for 4 h to obtain a mixed solution;

[0043] (3) Transfer the stirred mixed solution into a reaction kettle with a capacity of 60ml, and heat it to 150°C in a microwave heating box, react for 10h, and naturally cool to room temperature; Centrifuge for 5 minutes under the same conditions, remove the filter residue of the supernatant, wash with deionized water and absolute ethanol three times respectively, and then dry in a vacuum drying oven to o...

Embodiment 2

[0048] A sulfur-doped ReSe 2 The preparation method of / MXene composite material, comprises the following steps:

[0049] (1) Add 0.1mmol of ReSe 2 Nanoparticles, 15ml of N,N-dimethylformamide (DMF) and 10ml of ultrapure water were fully stirred and mixed to obtain a suspension;

[0050] (2) 0.1mmol of MXene (Ti 3 C 2 T x ) nanosheets, suspension, 0.07 mmol of sulfur powder and 20 ml of ultrapure water were mixed, treated in an ultrasonic cleaner with an ultrasonic frequency of 50W for 0.5 h at 27°C, and then magnetically stirred for 5 h to obtain a mixed solution;

[0051] (3) Transfer the mixed solution into a reaction kettle with a capacity of 60ml, heat it to 180°C in a microwave oven, react for 12h, and cool it to room temperature naturally, then transfer the product to a centrifuge tube and centrifuge at 7500r / min for 5 min, the filter residue was washed three times with deionized water and absolute ethanol, and then dried in a vacuum oven to obtain a crude product, ...

Embodiment 3

[0056] A sulfur-doped ReSe 2 The preparation method of / MXene composite material, comprises the following steps:

[0057] (1) Add 0.2mmol of ReSe 2 Nanoparticles, 15ml of N,N-dimethylformamide (DMF) and 10ml of ultrapure water were fully stirred and mixed to obtain a suspension;

[0058] (2) 0.2mmol of MXene (Ti 3 C 2 T x ) nanosheets, suspension, 0.13 mmol of thiourea and 20 ml of ultrapure water were mixed, treated in an ultrasonic cleaner at 27° C. with an ultrasonic frequency of 50 W for 0.5 h, and then magnetically stirred for 4 h to obtain a mixed solution;

[0059] (3) Transfer the mixed solution into a reaction kettle with a capacity of 60ml, heat it to 180°C in a microwave oven, react for 12h, and cool it to room temperature naturally, then transfer the product to a centrifuge tube and centrifuge at 7500r / min for 5 min, the filter residue was washed three times with deionized water and absolute ethanol, and then dried in a vacuum oven to obtain a crude product, wh...

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Abstract

The invention discloses a preparation method of a sulfur-doped ReSe2 / MXene composite material, which comprises the following steps: by using MXene as a main substrate, loading synthesized ReSe2 on MXene, doping a sulfur element into the ReSe2 / MXene composite material, and carrying out heat treatment reaction to obtain the sulfur-doped ReSe2 / MXene composite material. The sulfur-doped ReSe2 / MXene composite material is good in conductivity, the interlayer spacing is increased, and the specific surface area is large. The special layered structure of the MXene effectively alleviates the problems ofelectrical performance reduction, structural collapse and the like caused by agglomeration or volume expansion of the negative electrode material in the cyclic charging and discharging process; the loading of ReSe2 effectively improves the interlayer spacing and increases the specific surface area; furthermore, the doping of the sulfur element enables the ReSe2 / MXene composite material to exposemore active sites and vacancies, so that the potassium storage performance of the material is improved. MXene, ReSe2 and sulfur atoms make up for respective defects and deficiencies and have a synergistic effect, so that the potassium storage performance, the specific capacity, the charging and discharging stability, the electron transfer rate and the like of the composite material are improved tothe greatest extent. Meanwhile, the preparation process is simple, and the performance is controllable.

Description

technical field [0001] The invention belongs to the technical field of new energy, in particular to a sulfur-doped ReSe 2 / MXene composites preparation method. Background technique [0002] Lithium-ion batteries have been developed rapidly in the fields of portable electronic communication equipment and electric vehicles. However, the current reserves of lithium resources in the earth are small, and with the increase in battery demand, lithium resources are decreasing, which greatly limits battery technology. continuous development. Therefore, a new type of battery needs to be developed to reduce the use of lithium ions. Potassium and lithium are both the first main group elements. They have similar reserves and potentials, and potassium ions have a high potential platform, energy density and abundant storage capacity, so they have great development potential. However, in practical applications, potassium-ion batteries still face great challenges. [0003] MXene is a com...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/136H01M10/054B82Y40/00
CPCH01M4/362H01M4/58H01M4/581H01M4/136H01M10/054B82Y40/00Y02E60/10
Inventor 张业龙周健文徐晓丹孙宏阳李振瀚宋伟东郭月温锦秀
Owner WUYI UNIV
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