Electrolyte containing monooxy boron trifluoride salt and preparation method and application thereof

A boron trifluoride and electrolyte technology, applied in the field of batteries, can solve the problems of strong presence, no industrial application results, and little results, and achieve the effects of inhibiting decomposition, excellent electrochemical performance, and easy dissociation

Inactive Publication Date: 2022-06-21
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are only very few researchers who are concerned about the 3 sporadic studies on compounds with a BF 3 Group research, at present, there is not much achievement, let alone the achievement of industrial application; there is little in the prior art for -O-BF 3 R group research, this is because -OBF 3 The existence of R is strong, and the functional group in the molecule changes, which may cause unpredictable changes in the impact of the synthesized substance on the battery cycle performance. Therefore, the research team has only studied the 3 R for research

Method used

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  • Electrolyte containing monooxy boron trifluoride salt and preparation method and application thereof
  • Electrolyte containing monooxy boron trifluoride salt and preparation method and application thereof
  • Electrolyte containing monooxy boron trifluoride salt and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0108] raw material

[0109] Preparation method: Under nitrogen atmosphere, mix the raw material (0.58g, 0.01mol) and boron trifluoride tetrahydrofuran complex (1.4g, 0.01mol) in 15ml of ethylene glycol dimethyl ether, and react at room temperature for 12 hours. The obtained mixed solution was dried under reduced pressure at 40° C. and a vacuum degree of about -0.1 MPa to remove the solvent to obtain an intermediate. Dissolve lithium ethoxide (0.52g, 0.01mol) in 10ml of ethanol and slowly add it to the intermediate, stir and react at 45°C for 8 hours, and dry the resulting mixture under reduced pressure at 45°C and vacuum degree of about -0.1MPa , The obtained solid was washed three times with n-butyl ether, filtered and dried to obtain the product M1. The yield was 87%.

Embodiment 2

[0111] raw material

[0112] Preparation method: Under argon atmosphere, mix the raw material (1.02g, 0.01mol) and boron trifluoride etherate complex (1.42g, 0.01mol) in 15ml THF (tetrahydrofuran), and react at room temperature for 12 hours. The resulting mixed solution was dried under reduced pressure at 30° C. and a vacuum of about −0.1 MPa to remove the solvent to obtain an intermediate. Add 6.30ml of butyllithium hexane solution (c=1.6mol / L) to the intermediate, stir and react at room temperature for 6 hours, and dry the resulting mixture under reduced pressure at 40°C and vacuum degree of about -0.1MPa , the obtained crude product was washed 3 times with cyclohexane, filtered and dried to obtain the product M2. The yield was 90%.

Embodiment 3

[0114] raw material

[0115] Preparation method: Under a nitrogen atmosphere, take a certain amount of raw materials (1.02g, 0.01mol) and lithium methoxide (0.38g, 0.01mol), mix them with 20ml of methanol, and react at room temperature for 8 hours. The obtained mixed solution was dried under reduced pressure at 40° C. and a vacuum degree of about -0.1 MPa to remove the solvent to obtain an intermediate. Boron trifluoride tetrahydrofuran complex (1.47g, 0.0105mol) and 15ml THF (tetrahydrofuran) were added to the intermediate, and the reaction was stirred at room temperature for 6 hours. Drying under reduced pressure, the obtained solid was washed three times with isopropyl ether, filtered and dried to obtain the product M3. Yield 89%.

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Abstract

The invention provides an electrolyte containing monooxy boron trifluoride salt as well as a preparation method and application thereof, and the electrolyte comprises boron trifluoride salt with a structure as shown in a general formula I. The electrolyte provided by the invention can be used as a functional additive to form a passive film on the surface of an electrode to prevent the electrode from decomposing all components of the electrolyte; the salt can be used as a main salt, is mainly used for providing transmittable ions for a battery, and is secondarily used for forming a passivation film on the surface of an electrode; the polymer electrolyte can be subjected to in-situ / ex-situ polymerization to form a single-ion conductor polymer electrolyte and a polymer skeleton for application, and provides high ionic conductivity, high electrochemical stability and excellent mechanical properties for batteries. Therefore, the battery prepared from the electrolyte has excellent long cycle stability, long battery life, low raw material price and good economic benefit.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to an electrolyte containing monooxy boron trifluoride salt and its preparation method and application. Background technique [0002] Electrolyte is an important and necessary component of secondary batteries. Batteries have the advantages of high energy density, high voltage, many cycles, and long storage time. Since their commercialization, they have been widely used in electric vehicles, energy storage power stations, drones, In various aspects such as portable devices, regardless of the application direction, there is an urgent need to improve the energy density and cycle performance of batteries on the premise of ensuring battery safety. [0003] The battery mainly includes positive electrode, negative electrode, electrolyte and separator. To increase the energy density of the battery is to increase the working voltage and discharge capacity of the battery, that is, ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/42H01M10/0567H01M10/0568H01M10/0569
CPCH01M10/0565H01M10/4235H01M10/0567H01M10/0568H01M10/0569H01M2300/0025
Inventor 俞会根杨萌程勇斌
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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