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Polyoxygroup-containing boron trifluoride salt electrolyte and preparation method and application thereof

A technology of oxyboron trifluoride and electrolyte, which is applied in the field of batteries, can solve the problems of high time cost and economic cost, unpredictable results, and many uncontrollable factors, and achieve excellent electrochemical performance, improved electrochemical performance, The effect of widening the electrochemical window

Inactive Publication Date: 2022-07-01
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is also because of -OBF 3 The presence of M is strong, if -OBF is added to the molecule 3 The number of M may have unpredictable changes to the overall properties of the entire molecular structure. Therefore, if the research team conducts a multi-OBF 3 In the research of M, there are many uncontrollable factors, and the effect cannot be preset, and the resistance will be greatly increased. It may consume a lot of time and economic cost, and the results are not easy to predict. Therefore, the research team has only studied the 3 M conduct research

Method used

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  • Polyoxygroup-containing boron trifluoride salt electrolyte and preparation method and application thereof
  • Polyoxygroup-containing boron trifluoride salt electrolyte and preparation method and application thereof
  • Polyoxygroup-containing boron trifluoride salt electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Example 1: Raw materials M1

[0108] Preparation method: under nitrogen atmosphere, mix 0.01 mol of raw material and 0.04 mol of boron trifluoride tetrahydrofuran complex in 20 ml of ethylene glycol dimethyl ether, and react at room temperature for 12 hours. The obtained mixed solution was dried under reduced pressure under the conditions of 40° C. and a vacuum degree of about -0.1 MPa to remove the solvent to obtain an intermediate. Dissolve 0.04mol of lithium ethoxide in 10ml of ethanol and slowly add it to the intermediate, stir and react at 45°C for 8 hours, and dry the resulting mixed solution under reduced pressure at 45°C and a vacuum degree of about -0.1MPa, and the obtained solid is N-butyl ether was washed three times, filtered and dried to obtain product M1, wherein Q is OBF 3 Li. The yield was 85%, NMR as figure 1 shown.

Embodiment 2

[0109] Example 2: Raw materials M2

[0110] Preparation method: under argon atmosphere, slowly add 0.04mol metal lithium sheet to 0.01mol raw material, react at room temperature for 1 hour, then heat up to 50°C until the lithium sheet reacts completely to obtain an intermediate. 0.04mol of boron trifluoride butyl ether complex was added to the intermediate, and the reaction was stirred at 50°C for 7 hours, and the obtained mixed solution was dried under reduced pressure at 50°C and a vacuum degree of about -0.1MPa, and the obtained solid was Isopropyl ether was washed three times, filtered and dried to obtain product M2, wherein Q is OBF 3 Li. The yield was 89%, NMR as figure 2 shown.

Embodiment 3

[0111] Example 3: Raw materials M3

[0112] Preparation method: under a nitrogen atmosphere, 0.01 mol of raw materials and 0.05 mol of lithium hydroxide are mixed uniformly with 10 ml of methanol solution, and the reaction is carried out at room temperature for 8 hours. The obtained mixed solution was dried under reduced pressure under the conditions of 40° C. and a vacuum degree of about -0.1 MPa to remove the solvent to obtain an intermediate. 0.05mol of boron trifluoride phosphoric acid complex and 15ml of THF were added to the intermediate, and the reaction was stirred at 45°C for 12 hours, and the obtained mixed solution was dried under reduced pressure at 60°C and a vacuum degree of about -0.1MPa to obtain the obtained The crude product is filtered and dried with dichloromethane to obtain product M3, wherein Q is OBF 3 Li. The yield was 82%, NMR as image 3 shown.

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Abstract

The invention relates to a polybasic oxygen group-containing boron trifluoride salt electrolyte and a preparation method and application thereof, the electrolyte comprises a boron trifluoride salt represented by the following general formula I: wherein Q1 represents-OBF3M, M is a metal cation; r, R1, R2, R3, R4 and R5 are independently null, a first ring or a first chain containing at least one atom, and R and R1-R5 cannot be H or null at the same time; and any one, two or more atoms of R, R1, R2, R3, R4 and R5 are connected with 3-8-OBF3M. The boron trifluoride salt provided by the invention can be applied as an additive in a battery. The boron trifluoride salt can be applied to a liquid electrolyte, a gel electrolyte, a mixed solid-liquid electrolyte, a quasi-solid electrolyte and an all-solid electrolyte, and is beneficial to improving the energy density and the cycle stability of a battery and prolonging the service life of the battery. The raw materials are low in price, the synthesis process is simple, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a polyoxygenated boron trifluoride salt electrolyte and a preparation method and application thereof. Background technique [0002] Electrolyte is an important and necessary component of batteries. Batteries have the advantages of high energy density, high voltage, many cycles, and long storage time. Since commercialization, they have been widely used in electric vehicles, energy storage power stations, drones, and portable devices. Regardless of the application direction, it is urgent to improve the energy density and cycle performance of the battery under the premise of ensuring the safety of the battery. [0003] The current development of liquid batteries mainly includes positive electrodes, negative electrodes, electrolytes and separators. To improve the energy density of the batteries is to increase the working voltage and discharge capacity of the batteries, that is, to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/02C07F7/04C07F7/08C07F9/6593C07H1/00C07H11/00C07H13/08C07H15/203C07H19/048H01M10/0525H01M10/0568
CPCC07F5/022C07F7/081C07F7/083C07F7/04C07H19/048C07H15/203C07H13/08C07H11/00C07H1/00C07F9/65815H01M10/0525H01M10/0568
Inventor 杨萌程勇斌俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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