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Grignard reagent derivative-added lithium-sulfur electrolyte, and preparation method and application thereof

A technology of Grignard reagents and derivatives, applied in the field of lithium-sulfur electrolytes with Grignard reagent derivatives, can solve the problems of preventing the dissolution of intermediate products, complicated processes, hindering the formation of lithium branch crystals, etc. Good application prospect and good protective effect

Active Publication Date: 2021-08-06
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional lithium-ion batteries, lithium-sulfur batteries are considered to be the next-generation energy storage devices with very promising prospects due to the high theoretical capacity, low cost, and environmental friendliness of sulfur cathode materials; however, the discharge product dissolves Poor performance and severe shuttle effect during cycling, and the formation of lithium dendrites makes the electrochemical performance of lithium-sulfur batteries poor, which is greatly limited in practical applications.
[0003] In order to prevent the dissolution of polysulfides, improve the utilization rate of sulfur, and at the same time inhibit the shuttle effect and hinder the formation of lithium dendrites, researchers have carried out a lot of work on positive electrode materials, electrolytes, separators, and lithium negative electrode materials. Although To some extent, it can improve the utilization rate of sulfur and suppress the shuttle effect, but the scheme adopted is complex and unfavorable for large-scale industrial production; although the common lithium-sulfur electrolyte greatly improves the electrochemical capacity of the battery, but It cannot prevent the dissolution of intermediate products well, inhibit the shuttle effect, and improve the stability of the battery. Therefore, it is necessary to develop a low-cost and high-efficiency lithium-sulfur electrolyte

Method used

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  • Grignard reagent derivative-added lithium-sulfur electrolyte, and preparation method and application thereof
  • Grignard reagent derivative-added lithium-sulfur electrolyte, and preparation method and application thereof
  • Grignard reagent derivative-added lithium-sulfur electrolyte, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A lithium-sulfur electrolyte solution added with Grignard reagent derivatives, the composition is as follows: the lithium-sulfur electrolyte solution is commercially available 1.0mol / L LiTFSI in DOL / DME (volume ratio 1:1) with 0.1M LiNO 3 , The amount of HMDSMgCl Grignard reagent derivative added is 0.25% of the volume of the lithium-sulfur electrolyte.

[0029] The above-mentioned preparation method of the lithium-sulfur electrolyte with the addition of Grignard reagent derivatives comprises the following steps:

[0030] Step 1: Prepare a THF solution of HMDSMgCl; for details, refer to Structure and compatibility of a magnesium electrolyte with a sulfur cathode (DOI: 10.1038 / ncomms1435).

[0031] Step 2: In a glove box filled with argon, make the glove box water content less than 1ppm, oxygen content less than 10ppm, take lithium sulfur electrolyte 1.0 mol / L LiTFSI in DOL:DME=1:1 Vol% with 0.1M LiNO 3 2mL;

[0032] Step 3: Seal the Grignard reagent derivative into a...

Embodiment 2

[0034] A method for preparing a lithium-sulfur electrolyte that adds Grignard reagent derivatives, comprising the steps of:

[0035] Step 1: In a glove box filled with argon, make the glove box water content less than 1ppm, oxygen content less than 10ppm, take lithium sulfur electrolyte 1.0 mol / L LiTFSI in DOL:DME=1:1 Vol% with 0.1M LiNO 3 2mL;

[0036] Step 2: Seal the Grignard reagent derivatives into a glove box, take 5 μL of purchased (HMDS) with a purity of 97% 2 Mg was added to the lithium-sulfur electrolyte and mixed evenly to prepare a lithium-sulfur electrolyte containing 0.25% Grignard reagent derivatives by volume.

experiment example

[0040]Mix 80 mg graphene (graphene powder YH-GP-03, D50=25±3μm, conductivity ≥ 15000S / m, carbon content ≥ 95wt%, purchased by Shandong Yuhuang New Energy Technology Co., Ltd.) and sulfur powder (A Latin, purity ≥ 99.99%) mixed and ground at a mass ratio of 4:6, oven 160 ° C, 720 min of sulfur filling, to obtain the positive electrode material, the obtained positive electrode material was mixed with acetylene black and PVDF at a mass ratio of 7:2:1 Evenly, add N-methylpyrrolidone and mix it into a slurry, and use a spreader to coat the positive electrode material slurry on the aluminum foil. The loading capacity of the highly conductive graphene after sulfur loading is 1.01 mg / cm 2 , in an oven at 50°C for 720 min to prepare a positive electrode sheet. With a lithium sheet with a diameter of 16 mm as the negative electrode, add 200 μL of the lithium-sulfur electrolyte solution in Example 1 with methylmagnesium chloride, assemble the battery in a glove box, and charge and discha...

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Abstract

The invention discloses a Grignard reagent derivative-added lithium-sulfur electrolyte, and a preparation method and application thereof, and belongs to the technical field of lithium batteries. The electrolyte is obtained by adding a Grignard reagent derivative into a lithium-sulfur electrolyte. The lithium-sulfur electrolyte is an organic solvent of a lithium salt, the concentration of the lithium salt in the organic solvent is 0.5-2 mol / L, and the addition amount of the Grignard reagent derivative is 0.2-0.3% of the volume of the lithium-sulfur electrolyte; and the lithium salt is one or more of lithium trifluoromethanesulfonate, bistrifluoromethanesulfonimide lithium salt, lithium tris(trifluoromethanesulfonyl) methide, lithium bis(oxalyl) borate and the like. A trace amount of the Grignard reagent derivative is added into the lithium-sulfur electrolyte, so that conversion and catalysis of an intermediate product polysulfide are promoted, and dissolution of the intermediate product is reduced; meanwhile, a small amount of the Grignard reagent derivative can have a certain protection effect on the lithium negative electrode, the shuttle effect is inhibited, and the capacity and the cycling stability of the battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and specifically designs a lithium-sulfur electrolyte solution added with Grignard reagent derivatives, a preparation method and application thereof. Background technique [0002] With the development of science and technology, people have higher and higher requirements for energy storage devices. Therefore, the development of secondary batteries with high energy density has become a major topic in today's society. Compared with traditional lithium-ion batteries, lithium-sulfur batteries are considered to be the next-generation energy storage devices with very promising prospects due to the high theoretical capacity, low cost, and environmental friendliness of sulfur cathode materials; however, the discharge product dissolves Poor performance and severe shuttle effect during cycling, and the formation of lithium dendrites make the electrochemical performance of lithium-sulfur batteries poor, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/052H01M10/42
CPCH01M10/0567H01M10/058H01M10/052H01M10/4235Y02P70/50Y02E60/10
Inventor 肖助兵陈淼周丹吴天利
Owner HENAN UNIVERSITY