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Preparation method of sulfonyldiimidazole-based ionic liquid

A technology of sulfuryl diimidazolium and sulfuryl diimidazole, which is applied in the field of preparation of sulfuryl diimidazolium-based ionic liquids, can solve problems affecting battery cycle performance, structure collapse, and transition metal ion dissolution, etc., and achieve novel structure and improved High voltage resistance and high reaction yield

Inactive Publication Date: 2019-10-08
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(3) After the positive electrode material catalyzes and oxidizes the electrolyte reaction, low-valent state transition metal ions are generated at the interface, the interface structure changes from a layered structure to a spinel structure, the crystal structure shrinks, and the structure collapses, resulting in transition The dissolution of metal ions affects the cycle performance of the battery

Method used

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  • Preparation method of sulfonyldiimidazole-based ionic liquid
  • Preparation method of sulfonyldiimidazole-based ionic liquid

Examples

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Embodiment 1

[0025] Add 400g of dichloromethane into a 1000mL two-necked flask, then put 200g of imidazole into it, stir to make it fully dissolve, and place the reaction bottle in a low-temperature reactor at 0°C, then gradually add 86.2g of it dropwise to the reaction bottle Sulfonyl chloride (obtained according to the method of non-patent literature: J. Power Sources, 2016, 329, 586-593), gas is released during the reaction, and the hydrogen chloride gas generated is absorbed by aqueous sodium hydroxide solution. After the dropwise addition was completed, the reaction temperature was adjusted to room temperature and the reaction was stopped after stirring for 15 h. After filtering and washing twice with dichloromethane, the dichloromethane was spin-dried to obtain a light yellow solid, which was crystallized with boiling isopropanol to obtain 113.9 g of white crystals, namely sulfuryl diimidazole, with a yield of 90%.

[0026] Continue to dissolve the sulfuryl diimidazole obtained above...

Embodiment 2

[0029] Add 400g of dichloromethane into a 1000mL two-necked flask, then put 200g of imidazole into it, stir to make it fully dissolve, and place the reaction bottle in a low-temperature reactor at 0°C, then gradually add 86.2g of it dropwise to the reaction bottle Sulfonyl chloride (obtained according to the method of non-patent literature: J. Power Sources, 2016, 329, 586-593), gas is released during the reaction, and the hydrogen chloride gas generated is absorbed by aqueous sodium hydroxide solution. After the tape addition was completed, the reaction temperature was adjusted to room temperature and the reaction was stopped after stirring for 15 h. After filtering and washing twice with dichloromethane, the dichloromethane was spin-dried to obtain a light yellow solid, which was crystallized with boiling isopropanol to obtain 113.9 g of white crystals, namely sulfuryl diimidazole, with a yield of 90%.

[0030] Continue to dissolve the sulfuryl diimidazole obtained above int...

Embodiment 3

[0033] Add 400g of dichloromethane into a 1000mL two-necked flask, then put 200g of imidazole into it, stir to make it fully dissolve, and place the reaction bottle in a low-temperature reactor at 0°C, then gradually add 86.2g of it dropwise to the reaction bottle Sulfonyl chloride (obtained according to the method of non-patent literature: J. Power Sources, 2016, 329, 586-593), gas is released during the reaction, and the hydrogen chloride gas generated is absorbed by aqueous sodium hydroxide solution. After the dropwise addition was completed, the reaction temperature was adjusted to room temperature and the reaction was stopped after stirring for 15 h. After filtering and washing twice with dichloromethane, the dichloromethane was spin-dried to obtain a light yellow solid, which was crystallized with boiling isopropanol to obtain 113.9 g of white crystals, namely sulfuryl diimidazole, with a yield of 90%.

[0034] Continue to dissolve the sulfuryl diimidazole obtained above...

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Abstract

The invention discloses a preparation method of a sulfonyldiimidazole-based ionic liquid. The preparation method comprises the steps of adding a certain quantity of imidazole into a nonaqueous solvent, stirring to allow full dissolution, reducing the reaction temperature, dropwise adding sulfonyl chloride, removing the nonaqueous solvent after reaction, crystallizing to obtain sulfonyldiimidazoleintermediate, continuing to dissolve the intermediate in another nonaqueous solvent, dropwise adding a halogenated alkane, and allowing to react to obtain alkyl-substituted sulfonyldiimidazole bromide; dissolving the alkyl-substituted sulfonyldiimidazole bromide in water, adding a lithium salt, carrying out ion exchanging, and separating and extracting to obtain the sulfonyldiimidazole-based ionicliquid. The sulfonyldiimidazole-based ionic liquid provided herein has novel structure and high reaction yield; when applied as a lithium-ion battery electrolyte additive, the sulfonyldiimidazole-based ionic liquid can improve evidently the high voltage resistance of batteries.

Description

[technical field] [0001] The invention belongs to the technical field of electrolyte additives for lithium ion batteries, and in particular relates to a preparation method of a sulfuryl diimidazolium-based ionic liquid. [Background technique] [0002] Lithium-ion batteries are gradually replacing lead-acid batteries and nickel-metal hydride batteries, and are widely used in digital, energy storage, and power fields. With the advent of the era of artificial intelligence and unmanned driving, lithium-ion batteries have shown performance that other batteries cannot replace, and are far superior to fuel cells in terms of manufacturing cost, ease of use, and degree of automation. In order to further increase the energy density of lithium-ion batteries, there are currently two options: 1. Choose positive and negative electrode materials with higher gram capacity density to reduce the amount of materials used; 2. Improve the voltage resistance of positive electrode materials and im...

Claims

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Application Information

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IPC IPC(8): C07D233/84C07C303/02C07C309/06C07C303/40C07C311/48C07C51/41C07C55/07C07F5/02H01M10/0525H01M10/0567
CPCC07D233/84C07C303/02C07C303/40C07C51/412C07F5/02H01M10/0567H01M10/0525C07C309/06C07C311/48C07C55/07Y02E60/10
Inventor 毛冲徐辑亮戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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