Additive for reducing viscosity of lithium-sulfur battery electrolyte and synthesis method of additive

A lithium-sulfur battery and synthesis method technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high rate performance, poor thermal stability, easy flatulence, etc., to reduce conductivity, improve electrical performance, and improve rate performance effect

Inactive Publication Date: 2019-01-29
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the above, the electrolytes used in lithium-sulfur batteries in the existing schemes, especially the TFSI-based electrolytes, have disadvantages such as high price, high viscosity, and poor battery rate characteristics, and the use of soluble liquids such as fluorinated ethers and TFSI The method of lowering the viscosity through the joint action of the method has poor thermal stability and is easy to flatulence, which cannot effectively solve the problem of high viscosity of the electrolyte and poor rate performance

Method used

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  • Additive for reducing viscosity of lithium-sulfur battery electrolyte and synthesis method of additive

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Slowly add N,N'-carbonyldiimidazole into the ethyl chloride solution while stirring, and then heat the reaction in a closed environment. After the reaction is complete, carry out distillation and crystallization, so that the ethyl group is grafted on the nitrogen atom of imidazole On the above, form ethyl grafted N'N-carbonyldiimidazole chloride salt crystal particles with chlorine atoms; the stirring speed is 130r / min, and the time is 28min; the reaction temperature is 76°C, and the time is 17h;

[0030] Among them: 29 parts by weight of N,N'-carbonyldiimidazole, 71 parts by weight of ethyl chloride solution;

[0031] (2) Wash the chlorine salt crystal particles prepared in step (1) with ethyl acetate to remove residual solvent, then mix them with sodium dicyanamide powder in acetone solution, and carry out magnetic stirring under sealed conditions, and then place in Evaporation and crystallization were carried out in an unsealed environment to remove crystal parti...

Embodiment 2

[0038] (1) Slowly add N,N'-carbonyldiimidazole into the ethyl chloride solution while stirring, and then heat the reaction in a closed environment. After the reaction is complete, carry out distillation and crystallization, so that the ethyl group is grafted on the nitrogen atom of imidazole On the above, form ethyl-grafted N'N-carbonyldiimidazole chloride salt crystal particles with chlorine atoms; the stirring speed is 110r / min, and the time is 35min; the reaction temperature is 72°C, and the time is 19h;

[0039] Wherein: 25 parts by weight of N,N'-carbonyldiimidazole, 75 parts by weight of ethyl chloride solution;

[0040] (2) Wash the chlorine salt crystal particles prepared in step (1) with ethyl acetate to remove residual solvent, then mix them with sodium dicyanamide powder in acetone solution, and carry out magnetic stirring under sealed conditions, and then place in Evaporation and crystallization were carried out in an unsealed environment to remove crystal particle...

Embodiment 3

[0047] (1) Slowly add N,N'-carbonyldiimidazole into the ethyl chloride solution while stirring, and then heat the reaction in a closed environment. After the reaction is complete, carry out distillation and crystallization, so that the ethyl group is grafted on the nitrogen atom of imidazole On, form ethyl grafted N'N-carbonyldiimidazole chloride salt crystal particles with chlorine atoms; the stirring speed is 150r / min, and the time is 20min; the reaction temperature is 70°C, and the time is 20h;

[0048] Among them: 20 parts by weight of N,N'-carbonyldiimidazole, 80 parts by weight of ethyl chloride solution;

[0049] (2) Wash the chlorine salt crystal particles prepared in step (1) with ethyl acetate to remove residual solvent, then mix them with sodium dicyanamide powder in acetone solution, and carry out magnetic stirring under sealed conditions, and then place in Evaporation and crystallization were carried out in an unsealed environment to remove crystal particles, and ...

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Abstract

The invention relates to the field of lithium-sulfur batteries, and discloses an additive for reducing viscosity of a lithium-sulfur battery electrolyte and a synthesis method of the additive. The preparation method comprises the following steps: (1) adding N, N'-carbonyldiimidazole into a chloroethane solution, carrying out stirring, carrying out heating for a reaction, carrying out distilling and crystallizing to obtain chlorine salt crystal particles of ethyl grafted N,N'-carbonyldiimidazole; (2) carrying out washing with ethyl acetate, carrying out blending with sodium dicyanamide powder in an acetone solution, carrying out magnetic stirring, and then carrying out evaporating and crystallizing to prepare an ionic liquid containing a small amount of acetone; and (3) adding ethanolamineinto the ionic liquid, and carrying out a reaction to obtain an amino-grafted ionic liquid, which is the additive capable of reducing viscosity of a lithium-sulfur battery electrolyte. The additive prepared by the preparation method disclosed by the invention has extremely low viscosity, and after the additive is added into a bis(trifluoromethanesulphonyl)imide (TFSI) ionic liquid electrolyte, viscosity of the electrolyte is reduced, and conduction capability for lithium ions is reduced. Moreover, amino in the additive can effectively adsorb polysulfides in a product, and the rate performanceof the electrolyte is improved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, and discloses an additive for reducing the viscosity of electrolyte solution of lithium-sulfur batteries and a synthesis method. Background technique [0002] Facing the rapid development of new energy technology, especially with the potential market demand in the field of intelligent communication and electric vehicles, the task of developing a secondary battery system with higher energy density is very urgent. From an electrochemical point of view, multi-electron reactive material systems are the basis for constructing high specific energy secondary batteries, among which lithium-sulfur batteries are a good example. Lithium-sulfur battery has a very high theoretical capacity, and its cost is relatively low, which has become the mainstream orientation of the next generation of new energy batteries. [0003] The safety performance of lithium-sulfur batteries is poor, mainly because the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/60H01M10/0567
CPCC07D233/60H01M10/0567Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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