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Sulfur-doped MXene negative electrode material as well as preparation method and application thereof

A negative electrode material, sulfur doping technology, used in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as unsatisfactory performance, achieve improved rate performance and cycle stability, good electrical conductivity, improved The effect of specific capacity

Inactive Publication Date: 2019-05-28
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MXene materials have been reported to be used in supercapacitors and lithium-ion batteries, but the performance of MXene bulk as anode materials for potassium-ion batteries is still unsatisfactory

Method used

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  • Sulfur-doped MXene negative electrode material as well as preparation method and application thereof
  • Sulfur-doped MXene negative electrode material as well as preparation method and application thereof
  • Sulfur-doped MXene negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of sulfur-doped MXene negative electrode material includes the following steps:

[0033] (1) Weigh 0.2g of V 2 CT x Place 4g of 2-phenylethanethiol on both ends of the quartz boat, and place the end with 2-phenylethylthiol on the upstream of the tube furnace;

[0034] (2) Under the protective atmosphere of high-purity argon (purity ≥99.8%) with a gas flow rate of 160ml / min, the temperature is increased from room temperature 20°C at 1.5°C / min to 170°C, kept for 2h, and then cooled at 0.5°C / min To 100°C, keep it at 100°C for 2h, then lower to room temperature, wash the sample with deionized water after cooling, and vacuum dry to obtain the final sample.

[0035] (3) Preparation of the negative electrode of potassium ion battery: mix the sulfur-doped MXene obtained in step (2) with polyvinylidene fluoride binder and carbon black in a mass ratio of 8:1:1, and add an appropriate amount of N- Methylpyrrolidone is uniformly stirred to form a slurry and coated on...

Embodiment 2

[0038] A preparation method of sulfur-doped MXene negative electrode material includes the following steps:

[0039] (1) Weigh 0.4g of V 2 CT x Place 8g of 2-phenylethanethiol on both ends of the quartz boat, and place the end with 2-phenylethylthiol on the upstream of the tube furnace.

[0040] (2) Under a high-purity argon atmosphere with a gas flow rate of 160ml / min, the temperature is increased from room temperature 20°C at 2.5°C / min to 320°C, kept for 2h, and then cooled to 100°C at 2.5°C / min. Keep it at ℃ for 2h, then lower to room temperature, wash the sample with deionized water after cooling, and vacuum dry to obtain the final sample.

[0041] (3) Preparation of the negative electrode of potassium ion battery: mix the sulfur-doped MXene obtained in step (2) with polyvinylidene fluoride binder and carbon black in a mass ratio of 8:1:1, and add an appropriate amount of N- Methylpyrrolidone is uniformly stirred to form a slurry and coated on the current collector, and after va...

Embodiment 3

[0044] A preparation method of sulfur-doped MXene negative electrode material includes the following steps:

[0045] (1) Weigh 0.5g of V 2 CT x Place 10g of 2-phenylethanethiol on both ends of the quartz boat, and place the end with 2-phenylethylthiol on the upstream of the tube furnace.

[0046] (2) Under a high-purity argon atmosphere with a gas flow rate of 160ml / min, the temperature is increased from 20°C at room temperature to 600°C at 5°C / min and kept for 2h, and then cooled to 100°C at 4°C / min. Keep it at ℃ for 2h, then lower to room temperature, wash the sample with deionized water after cooling, and vacuum dry to obtain the final sample.

[0047] (3) Preparation of the negative electrode of potassium ion battery: mix the sulfur-doped MXene obtained in step (2) with polyvinylidene fluoride binder and carbon black in a mass ratio of 8:1:1, and add an appropriate amount of N- Methylpyrrolidone is uniformly stirred to form a slurry and coated on the current collector, and after...

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Abstract

The invention discloses a sulfur-doped MXene negative electrode material, and a preparation method thereof. The preparation method comprises the following steps: (1) respectively placing a sulfur precursor material and MXene at two sides in a quartz boat, and then transferring the quartz boat into a tube furnace, with the mass ratio of the sulfur precursor material to the MXene being (15-25):1, wherein one side, in which the sulfur precursor material is placed, of the quartz boat is positioned at the upstream of the tube furnace; and (2) introducing a protective gas, carrying out a heat treatment reaction, and conducting cooling to room temperature, washing, and out vacuum drying to obtain the sulfur-doped MXene negative electrode material, wherein the heat treatment reaction is as below:increasing the temperature from room temperature to 170-600 DEG C, conducting insulation for 1.5 h-2.5 h, reducing the temperature to 80-120 DEG C, and conducting insulation for 1.5-2.5h. The preparedsulfur-doped MXene negative electrode material is large in specific surface area, shows good electrical conductivity, improves the specific capacity and cyclic stability of a potassium ion battery, and has controllable sulfur element doping amount, and is suitable for large-scale application.

Description

Technical field [0001] The invention belongs to the field of new energy materials, and specifically relates to a preparation method of sulfur-doped MXene negative electrode material and its application in a potassium ion battery. Background technique [0002] With the rapid development of modern society, traditional energy sources are increasingly depleted, and the search for new clean energy has become more urgent. Lithium-ion batteries have the characteristics of high voltage, large specific energy, long cycle life, and small self-discharge, and become one of the most widely studied batteries at present. However, the massive consumption of metallic lithium has also begun to cause people's concerns. Therefore, looking for a replacement for lithium-ion batteries has become the current research focus. [0003] Due to the rich resources of potassium, uniform distribution, and low cost, potassium ion batteries may become a battery system widely used in the field of large-scale elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054
CPCY02E60/10
Inventor 张业龙余金龙孙宏阳徐晓丹凡雨渲汪达张弛宋伟东陈梅温锦秀郭月曾庆光彭章泉
Owner WUYI UNIV
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