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

A composite material, sulfur-doped technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as unsatisfactory performance, achieve good cycle performance and rate performance, stable cycle performance, embedded / Moderate effect on depotassium potential

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

AI Technical Summary

Problems solved by technology

However, pure MXene materials are used as anode materials for potassium-ion batteries, and their performance is still not satisfactory.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of sulfur-doped MXene composite material, comprising the following steps:

[0029] (1) Weigh 0.1g of Ti 3 C 2 T x Add 0.1 g of phenylene sulfide into deionized water, heat to 50° C. and magnetically stir for 1 hour to obtain a mixed solution.

[0030] (2) Move the mixed solution to the reactor to seal it, and then place it in an oven, adjust the reaction temperature to 80° C., and the reaction time to 4 hours.

[0031] (3) The obtained product was alternately washed 3 times with deionized water and ethanol, centrifuged at a centrifugal speed of 3000r / min for 2min, and finally put into a vacuum drying oven and dried at 60°C for 8h.

[0032] (4) Potassium ion battery negative electrode preparation: mix the obtained sulfur-doped MXene with polyvinylidene fluoride binder and carbon black in a ratio of 8:1:1 by mass, and add an appropriate amount of N-methylpyrrolidone, After stirring evenly, a slurry is formed and coated on the current collector, an...

Embodiment 2

[0035] A preparation method of sulfur-doped MXene composite material, comprising the following steps:

[0036] (1) Weigh 0.2g of Ti 3 C 2 T x Add 2 g of phenylene sulfide into deionized water, heat to 60° C., and magnetically stir for 3 hours to obtain a mixed solution.

[0037] (2) Move the mixed liquid to the reactor to seal it, and then place it in an oven, adjust the reaction temperature to 160° C., and the reaction time to 18 hours.

[0038] (3) The obtained product was alternately washed 3 times with deionized water and ethanol, centrifuged at a centrifugal speed of 3250r / min for 3min, and finally put into a vacuum drying oven and dried at 60°C for 16h.

[0039] (4) Potassium ion battery negative electrode preparation: mix the obtained sulfur-doped MXene with polyvinylidene fluoride binder and carbon black in a ratio of 8:1:1 by mass, and add an appropriate amount of N-methylpyrrolidone, After stirring evenly, a slurry is formed and coated on the current collector, a...

Embodiment 3

[0042] A preparation method of sulfur-doped MXene composite material, comprising the following steps:

[0043] (1) Weigh 0.5g of Ti 3 C 2 T xAdd 10 g of phenylene sulfide into deionized water, heat to 70° C., and magnetically stir for 5 hours to obtain a mixed solution.

[0044] (2) Move the mixed solution to the reaction kettle to seal it, and then place it in an oven, adjust the reaction temperature to 200° C., and the reaction time to 36 hours.

[0045] (3) The obtained product was alternately washed 3 times with deionized water and ethanol, centrifuged at a centrifugal speed of 3500r / min for 4min, and finally put into a vacuum drying oven and dried at 60°C for 24h.

[0046] (4) Potassium ion battery negative electrode preparation: mix the obtained sulfur-doped MXene with polyvinylidene fluoride binder and carbon black in a ratio of 8:1:1 by mass, and add an appropriate amount of N-methylpyrrolidone, After stirring evenly, a slurry is formed and coated on the current co...

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Abstract

The invention discloses a sulfur-doped MXene composite material and a preparation method thereof, and the preparation method comprises the following steps: (1) adding MXene and a sulfur source into deionized water according to a mass ratio of 1: 1-20, stirring and heating to prepare a mixed solution with the concentration of 5-80 mg / ml; (2) transferring the mixed solution into a reaction kettle, and heating to 80-200 DEG C; reacting for 4-36h, and then cooling to room temperature; and (3) washing the product obtained in the step (2) with a detergent, centrifuging, and carrying out vacuum drying to obtain the sulfur-doped MXene composite material. The prepared sulfur-doped MXene composite material has the advantages of high structural stability, stable cycle performance, high charge-discharge coulombic efficiency and the like, and the prepared negative electrode material is moderate in potassium intercalation / deintercalation potential and good in cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of a sulfur-doped MXene composite material and its application in potassium ion batteries. Background technique [0002] With the rapid development of modern society and the depletion of traditional energy sources, it is more urgent to find new clean energy sources. Due to its good chemical stability and electrochemical performance, lithium-ion batteries have been the core direction of the field of rechargeable batteries since their birth. However, lithium storage is limited, mining is difficult, and it is difficult to be widely used. In order to find a substitute for lithium-ion batteries, potassium, which has similar chemical properties and a larger storage capacity, has begun to attract the interest of researchers. It is of great scientific significance to study the anode of high-performance potassium-ion batteries. [0003] The radius of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/054
CPCY02E60/10
Inventor 张业龙余金龙徐晓丹孙宏阳汤伟健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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