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Preparation method of high-specific-energy organic electrolyte applied to lithium-sulfur hexafluoride battery and electrolyte

An organic electrolyte, sulfur hexafluoride technology, applied in fuel cell type half cells and primary cell type half cells, electrolytes, circuits, etc., can solve problems such as poor performance, reduce the degree of passivation, improve Discharge specific energy, the effect of improving solubility

Pending Publication Date: 2022-06-14
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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Problems solved by technology

[0005] The problem to be solved by the present invention is that the commonly used carbonate electrolytes in the prior art have poor performance in lithium-sulfur hexafluoride batteries. A method for preparing an organic electrolyte and an electrolyte, which can improve the solubility of the electrolyte for discharge products, reduce the degree of passivation of the discharge products to the active sites of the electrodes, and increase the actual discharge specific energy

Method used

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  • Preparation method of high-specific-energy organic electrolyte applied to lithium-sulfur hexafluoride battery and electrolyte
  • Preparation method of high-specific-energy organic electrolyte applied to lithium-sulfur hexafluoride battery and electrolyte
  • Preparation method of high-specific-energy organic electrolyte applied to lithium-sulfur hexafluoride battery and electrolyte

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[0025] Please see attached figure 1 -accompanying drawing 3, the embodiment of the present invention provides a kind of preparation method of the high specific energy organic electrolyte that is applied to lithium-sulfur hexafluoride battery, comprises steps:

[0026] S1: dissolving anhydrous lithium nitrate in dimethylacetamide (DMA), and stirring to obtain a first solution;

[0027] S2: adding an anion acceptor to the first solution and stirring to obtain a second solution;

[0028] S3: add ethylene glycol dimethyl ether (DME) to the second solution, and stir to obtain a third solution;

[0029] S4: adding hydrofluoroether (BTFE) to the third solution and stirring to obtain a finished electrolyte solution.

[0030] Specifically, dimethylacetamide (DMA) is selected as the solvent, which has a high DN value and can effectively combine with lithium ions, thereby effectively increasing the solubility of lithium fluoride and lithium sulfide, thereby reducing the activity of the...

Embodiment 1

[0034] S1: Dissolve anhydrous lithium nitrate in dimethylacetamide (DMA), stir to obtain a first solution; the first rotation speed is 200r / min, T1 is 1h, make it fully dissolved, and the solution is clear and transparent, The concentration of anhydrous lithium nitrate is 1M.

[0035] S2: Add boron-based anion acceptor tris(2,2,2-trifluoroethyl) borate to the first solution, and stir to obtain a second solution; the second rotation speed is 400r / min, and T2 is 1h, so that It is fully dissolved, the solution is clear and transparent, and the concentration of boron-based anion acceptor tris(2,2,2-trifluoroethyl) borate is 0.08M.

[0036] S3: Add ethylene glycol dimethyl ether (DME) to the second solution, stir well to obtain a third solution; the third rotation speed is 200r / min, T3 is 1h, until the solution is clear and transparent, ethylene glycol dimethyl ether The volume ratio of (DME) to dimethylacetamide (DMA) was 1:4.

[0037] S4: Add hydrofluoroether (BTFE) to the thir...

Embodiment 2

[0045] S1: Dissolve anhydrous lithium nitrate in dimethylacetamide (DMA), stir to obtain a first solution; the first rotation speed is 200r / min, T1 is 0.5h, make it fully dissolved, and the solution is clear and transparent , the concentration of anhydrous lithium nitrate is 1.5M.

[0046] S2: adding boron-based anion acceptor tris(2,2,2-trifluoroethyl) borate to the first solution, and stirring to obtain a second solution; the second rotating speed is 600r / min, T2 is 0.5h, Make it fully dissolved, the solution is clear and transparent, and the concentration of boron-based anion acceptor tris(2,2,2-trifluoroethyl) borate is 0.1M.

[0047] S3: Add ethylene glycol dimethyl ether (DME) to the second solution, stir well to obtain a third solution; the third rotation speed is 300r / min, T3 is 0.6h, until the solution is clear and transparent, and the The volume ratio of ether (DME) to dimethylacetamide (DMA) was 1:6.

[0048] S4: Add hydrofluoroether (BTFE) to the third solution, ...

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Abstract

The invention provides a preparation method of a high-specific-energy organic electrolyte applied to a lithium-sulfur hexafluoride battery, which comprises the following steps: S1, dissolving anhydrous lithium nitrate in dimethylacetamide (DMA), and stirring to obtain a first solution; s2, adding an anion acceptor into the first solution, and stirring to obtain a second solution; s3, adding ethylene glycol dimethyl ether (DME) into the second solution, and stirring to obtain a third solution; and S4, adding hydrofluoroether (BTFE) into the third solution, and stirring to obtain a finished product electrolyte. The high-specific-energy organic electrolyte can improve the solubility of the electrolyte to a discharge product, reduce the passivation degree of the discharge product to an electrode active site, and improve the actual discharge specific energy. The preparation method has the characteristics of simplicity in operation, convenience and rapidness, and the prepared electrolyte has excellent electrical performance in the aspect of lithium-sulfur hexafluoride batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur hexafluoride batteries, and in particular relates to a preparation method and an electrolyte of a high specific energy organic electrolyte used in lithium-sulfur hexafluoride batteries. Background technique [0002] At present, with the increasing demand for high energy density systems in production, conversion reaction batteries have attracted great attention, and among them, lithium-gas batteries have attracted much attention in the industry due to their much higher specific energy than lithium-ion batteries. Lithium-oxygen batteries have become a current research hotspot because of their extremely high theoretical specific energy of 3450Wh / kg (based on the mass of lithium and oxygen), but their poor rate performance, large overpotentials, and common side reactions make them difficult to obtain. It is severely restricted. [0003] The lithium-sulfur hexafluoride battery can realize the t...

Claims

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Application Information

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IPC IPC(8): H01M12/06
CPCH01M12/06H01M2300/0037
Inventor 陈昱霖杨芳凝苏哓倩米娟
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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