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Preparation method of monofluoroethyl ethyl carbonate and application thereof

A technology of monofluoroethyl ethyl carbonate and monochloroethyl ethyl carbonate, applied in the field of preparation of monofluoroethyl ethyl carbonate, can solve the problems of blocked pipes, inconvenient use and the like

Pending Publication Date: 2022-02-25
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fluoroethylene carbonate has a five-membered ring structure with a melting point of 18°C, which will increase the freezing point of the electrolyte, which is quite inconvenient to use in winter, and accidents such as blocked pipes often occur

Method used

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  • Preparation method of monofluoroethyl ethyl carbonate and application thereof
  • Preparation method of monofluoroethyl ethyl carbonate and application thereof
  • Preparation method of monofluoroethyl ethyl carbonate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of monofluoroethyl ethyl carbonate comprises the following steps:

[0039] In a flask with stirring, mix 400g of monochloroethyl ethyl carbonate with 700g of the first organic solvent, the first organic solvent is diethyl carbonate, gradually add methyl as a phase transfer catalyst under slow stirring Cucurbituril [6] 4g, mix evenly, heat up to 65°C, and then add 240g of potassium fluoride powder in batches while maintaining the temperature (240g of potassium fluoride powder is added in three batches, each interval is 30 minutes , each time 80g), reflux reaction for 5h, let stand and cool to room temperature 20-25°C, collect the filtrate by filtration, wash the filter cake with the first organic solvent, rectify to remove the first organic solvent, mix with the filtrate, and distill under reduced pressure to obtain Monofluoroethyl ethyl carbonate, wherein, methyl cucurbituril [6] is 1wt% of monochloroethyl ethyl carbonate, in parts by mass, potass...

Embodiment 2

[0043] The preparation method of monofluoroethyl ethyl carbonate comprises the following steps:

[0044] In a flask with stirring, mix 400g of monochloroethyl ethyl carbonate with 700g of the first organic solvent, the first organic solvent is dimethyl carbonate, gradually add methyl as a phase transfer catalyst under slow stirring Cucurbituril [6] 12g, mix evenly, heat up to 90°C, and then add 240g of potassium fluoride powder in batches while maintaining the temperature (240g of potassium fluoride powder is added in three batches, each interval is 30 minutes , each time 80g), reflux reaction for 3h, let stand and cool to room temperature 20-25°C, collect the filtrate by filtration, wash the filter cake with the first organic solvent, rectify to remove the first organic solvent, mix with the filtrate, and distill under reduced pressure to obtain Monofluoroethyl ethyl carbonate, wherein, methyl cucurbituril [6] is 3wt% of monochloroethyl ethyl carbonate, in parts by mass, pota...

Embodiment 3

[0047] The battery is a nickel-cobalt-manganese ternary system battery, including: positive electrode, negative electrode, diaphragm and electrolyte. The positive electrode material is OK nickel-cobalt-manganese NCM523 ternary material, and the negative electrode is a circular metal lithium sheet. Among them, N-methylpyrrolidone (NMP) is used as a solvent, polyvinylidene fluoride PVDF is used as a binder, and carbon black conductive agent Super P is used as a conductive agent. The positive electrode slurry was prepared according to the mass ratio of positive electrode material: conductive agent: binder: NMP = 8:1:1:40. A doctor blade was used to evenly coat the positive electrode slurry on a flat aluminum foil with a thickness of 10 mm to obtain a pole piece. Put the coated pole pieces into a drying oven at 45°C for 12 hours. After being compressed by a tablet press, a pole piece with a smooth and even surface is obtained as the positive electrode.

[0048] The electrolyte i...

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Abstract

The invention discloses a preparation method of monofluoroethyl ethyl carbonate and an application thereof. The preparation method comprises the following steps that monochloroethyl ethyl carbonate and a first organic solvent are mixed, methyl cucurbituril [6] serving as a phase transfer catalyst is added and mixed to be uniform, the temperature is increased to 50-120 DEG C, potassium fluoride powder is added on the premise that the temperature is kept, a reaction is carried out for 3 to 6 hours, and standing and cooling are carried out to room temperature of 20 to 25 DEG C, a filtrate is collected by filtration, and the monofluoroethyl ethyl carbonate is obtained by distillation under reduced pressure. The monofluoroethyl ethyl carbonate is a chain-shaped fluorine-containing carbonate compound and is applied to an electrolyte additive, a compact SEI film can be formed on the surface of an electrode, and the cycle performance and the low-temperature performance of a battery are improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of monofluoroethyl ethyl carbonate, and in particular relates to a preparation method and application of monofluoroethyl ethyl carbonate. Background technique [0002] Lithium-ion batteries are currently the most popular power source due to their advantages of large specific capacity, long cycle life and no pollution, and are widely used in many fields. Applications in many fields and scenarios are limited. The use of additives is a common technical means to improve the performance of lithium-ion batteries. Additives play a vital role in solving the low-temperature performance of lithium batteries. For example, scholars from China University of Mining and Technology have studied the effect of N-N-dimethyltrifluoroacetamide on low-temperature performance, showing that DTA additives can improve the performance of graphite at room temperature and low temperature. Charge specific capacity, initi...

Claims

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Application Information

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IPC IPC(8): C07C68/06C07C68/08C07C69/96H01M10/0525H01M10/0567
CPCC07C68/06C07C68/08H01M10/0567H01M10/0525C07C69/96Y02E60/10
Inventor 张洪源王丽秀徐振堂秦雪杨金萍杨广亮徐颖李学楠
Owner TIANJIN VOCATIONAL INST