Ammonia-modified carbon quantum dot and preparation method thereof, and application of ammonia-modified carbon quantum dot in lithium-sulfur battery electrolyte

A technology of carbon quantum dots and lithium-sulfur batteries, applied in the application of ammonia-modified polymer carbon quantum dots as an electrolyte additive for lithium-sulfur batteries, ammonia-modified polymer carbon quantum dots and their preparation, and the field of ammonia-modified carbon quantum dots , which can solve the problems of high application cost, insignificant effect, and large amount of addition, and achieve the effect of low cost of raw materials, improved cycle performance, and small amount of addition.

Active Publication Date: 2019-11-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Ammonia-modified carbon quantum dot and preparation method thereof, and application of ammonia-modified carbon quantum dot in lithium-sulfur battery electrolyte
  • Ammonia-modified carbon quantum dot and preparation method thereof, and application of ammonia-modified carbon quantum dot in lithium-sulfur battery electrolyte
  • Ammonia-modified carbon quantum dot and preparation method thereof, and application of ammonia-modified carbon quantum dot in lithium-sulfur battery electrolyte

Examples

Experimental program
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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 837.5mAg -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 837.5mAg -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, a preparation method thereof and an application of the ammonia-modified carbon quantum dot in a lithium-sulfur battery electrolyte. An aldehyde compound is placed in an alkaline solution for reaction to obtain a carbon quantum dot, and the obtained carbon quantum dot and ammonia water are subjected to a reflux reaction to obtain an ammonia-modified carbon quantum dot. The ammonia-modified carbon quantum dot is used as an additive to be applied to a lithium-sulfur battery electrolyte, dissolution of polysulfide can be effectively inhibited, a shuttle effect is reduced, and the cycle performance of the lithium-sulfur battery is greatly improved.

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 Applications(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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