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Ether electrolyte as well as preparation method and application thereof

A technology of electrolyte and ether, which is applied in the field of preparation of lithium-sulfur-like electrolyte, can solve the problems of low utilization rate of sulfur positive electrode, high specificity of electrolyte, and high solubility of polysulfides, and achieve polysulfide shuttling effect suppression, The effect of increasing utilization rate and easy operation

Inactive Publication Date: 2020-06-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the technical problems of low utilization rate of sulfur positive electrode in lithium-sulfur batteries, large proportion of electrolyte in lithium-sulfur batteries, and high solubility of polysulfides in DOL-DME electrolyte

Method used

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  • Ether electrolyte as well as preparation method and application thereof
  • Ether electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) Dry the LiTFSI powder and place it in an oven for 24 hours.

[0057] 2) Weigh 1.47g LiTFSI and 2.005g G2, mix them in a small sample bottle, and stir at room temperature for half an hour.

[0058] 3) Add 1.16mL HFE to the mixture and continue stirring for 20h. All the above operations were performed in a glove box.

[0059] 4) Assemble the battery with the sulfur-carbon composite positive electrode, the newly configured electrolyte solution (three drops), and the lithium sheet negative electrode, and compact them. Battery performance tests were performed at room temperature.

Embodiment 2

[0061] 1) Dry the LiFSI powder and place it in an oven for 24 hours.

[0062] 2) Weigh 1.31g LiFSI and 2.005g G2 and mix them in a small sample bottle, and stir at room temperature for half an hour.

[0063] 3) Add 1.16mL HFE to the mixture and continue stirring for 20h. All the above operations were performed in a glove box.

[0064] 4) Assemble the battery with the sulfur-carbon composite positive electrode, the newly configured electrolyte solution (three drops), and the lithium sheet negative electrode, and compact them. Battery performance tests were performed at room temperature.

Embodiment 3

[0065] Embodiment 3 performance test

[0066]The electrolyte solutions prepared in Example 1 and Example 2 were assembled into a battery, and the electrical performance test was carried out.

[0067] The preparation method of the positive electrode: mix the sulfur-carbon composite material, acetylene black, and PVDF at a mass ratio of 8:1:1 to obtain a slurry, and coat the slurry on the substrate with a thickness of 200-250 μm, and the substrate is carbon-coated aluminum foil to get the positive electrode. Battery assembly: add 3 drops (0.12mL) of the electrolyte on the positive electrode, the mass ratio of the positive electrode to the electrolyte is 0.12:0.2; then combine the negative lithium sheet with the positive electrode to obtain a test battery.

[0068] Charge and discharge performance test:

[0069] The test parameters are: constant current charge and discharge at a rate of 0.5C, and the voltage range is 1.7V to 2.8V. Test results such as figure 1 Shown, wherein ...

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Abstract

The invention discloses an ether electrolyte. The ether electrolyte comprises a solute and a solvent; the solute contains lithium salt; the solvent is a mixed solution of diethylene glycol dimethyl ether and 1, 1, 2, 2-tetrafluoroethyl-2, 2, 3, 3-tetrafluoropropyl ether. According to the electrolyte, LiTFSI and LiFSI are mainly used as electrolytes, and G2 and HFE are used as solvents to prepare the novel lithium-sulfur electrolyte. A charge-discharge curve of the lithium-sulfur battery is reduced from two traditional voltage platforms to one, which shows that the electrolyte has low polysulfide dissolving capacity, the shuttle effect of polysulfide can be effectively inhibited, and the lithium-sulfur battery shows excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and in particular relates to a preparation method and application of an ether lithium-sulfur electrolyte. Background technique [0002] As the new darling of the next generation of energy storage batteries, lithium-sulfur batteries have received extensive attention from scientific researchers in the past decade. Due to the abundant reserves of sulfur in the earth's crust and high theoretical specific capacity (1675mAh / g), lithium-sulfur batteries Sulfur batteries show great application potential. However, the high solubility of polysulfides in DOL-DME solvents leads to their severe shuttle effect, which restricts the wide application of lithium-sulfur batteries. At present, people mainly start with the positive electrode material, and use carbon materials with good conductivity to combine with sulfur to improve the conductivity of the sulfur positive electrode. At the same time, the physi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/052
CPCH01M10/052H01M10/0569H01M2300/0037Y02E60/10
Inventor 吴忠帅路鹏飞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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