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A kind of ammonia-modified carbon quantum dots and its preparation method and application in lithium-sulfur battery electrolyte

A technology of carbon quantum dots and lithium-sulfur batteries, applied in the application field of ammonia-modified polymer carbon quantum dots and its preparation, ammonia-modified carbon quantum dots, and ammonia-modified polymer carbon quantum dots as electrolyte additives for lithium-sulfur batteries , can solve the problems of inconspicuous effect, high application cost, and large amount of addition, and achieve the effect of improving cycle performance, low raw material cost, and less addition amount

Active Publication Date: 2021-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of heteroatom doping of carbon quantum dots in the prior art is relatively complicated, and its addition amount in the lithium-sulfur battery electrolyte is large, and the effect is not obvious, resulting in high application cost of heteroatom-doped carbon quantum dots, and limitations its application

Method used

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  • A kind of ammonia-modified carbon quantum dots and its preparation method and application in lithium-sulfur battery electrolyte
  • A kind of ammonia-modified carbon quantum dots and its preparation method and application in lithium-sulfur battery electrolyte
  • A kind of ammonia-modified carbon quantum dots and its preparation method and application in lithium-sulfur battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of ammonia-modified polymer carbon quantum dots:

[0041] (1) Mix 40mL of acetaldehyde with sodium hydroxide to prepare a 1.5mol / L sodium hydroxide / acetaldehyde mixture, let it stand for 2 hours, add an appropriate amount of concentrated hydrochloric acid, adjust its pH to neutral, and set the temperature at 10000r / min Centrifuge for 10 min, wash with deionized water for 5 times, and vacuum dry at 80° C. for 24 h to obtain carbon quantum dots.

[0042] (2) Dissolve the 200 mg of carbon quantum dots in 30 ml of water, add 30 ml of ammonia water, reflux for 12 hours, and centrifugally dry to obtain ammonia-modified carbon quantum dots with a nitrogen content of 5%.

[0043] This example is basically the same as the comparative example, the only difference is that 0.01wt% ammonia-modified polymer carbon quantum dots are added to the electrolyte.

[0044] figure 1 It is the comparison of infrared images of polymer carbon quantum dots modified with ammonia and ...

Embodiment 2

[0047] This embodiment is basically the same as Embodiment 1, the only difference is that 0.05 wt% ammonia-modified polymer carbon quantum dots are added to the electrolyte.

[0048] from image 3 It can be seen that at a current density of 837.5mA g -1 The capacity remains at 887.0mAh g for 50 laps of the next cycle -1 . Compared with Comparative Example 1, it exhibits high capacity and cycle stability.

Embodiment 3

[0050] This embodiment is basically the same as Embodiment 1, the only difference is that 0.1 wt% ammonia-modified polymer carbon quantum dots are added to the electrolyte.

[0051] from image 3 It can be seen that at a current density of 837.5mA g -1 The capacity remains at 773.7mAh g for 50 laps under the next cycle -1 . Compared with Comparative Example 1, it exhibits high capacity and cycle stability.

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Abstract

The invention provides an ammonia-modified carbon quantum dot and its preparation method and its application in the electrolyte of lithium-sulfur batteries. The aldehyde compound is placed in an alkaline solution to react to obtain carbon quantum dots, and the obtained carbon quantum dots and ammonia water Reflux reaction to obtain ammonia-modified carbon quantum dots. Applying ammonia-modified carbon quantum dots as an additive to the electrolyte of lithium-sulfur batteries can effectively inhibit the dissolution of polysulfide compounds, reduce the "shuttle effect", and greatly improve the cycle performance of lithium-sulfur batteries.

Description

technical field [0001] The invention discloses an ammonia-modified carbon quantum dot, particularly relates to an ammonia-modified polymer carbon quantum dot and a preparation method thereof, and also relates to the application of the ammonia-modified polymer carbon quantum dot as an electrolyte additive for a lithium-sulfur battery. The invention is aimed at effectively reducing the loss of active material sulfur and reducing the negative impact brought by the "shuttle effect", and belongs to the technical field of lithium-sulfur batteries. Background technique [0002] Lithium-ion batteries have been widely used in our daily life. However, the energy density of current lithium-ion batteries is still insufficient to meet the needs of many applications. For emerging markets such as electric flight and long-haul freight, accelerating the development of alternative next-generation batteries that deliver high specific energy and power density is critical. Lithium-sulfur batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/42
CPCH01M10/052H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 纪效波徐来强侯红帅邹国强李佳阳
Owner CENT SOUTH UNIV
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