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Polymerizable electrolyte and preparation method and application thereof

A polymer electrolyte and electrolyte technology, applied in the field of polymerizable electrolyte and its preparation, can solve the problems of high energy density, long cycle intrinsic safety, etc., achieve excellent electrochemical performance, increase discharge specific capacity, and widen the electrochemical window Effect

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

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Problems solved by technology

Worldwide, all-solid-state batteries are still in their infancy, and they still cannot take into account high energy density, long cycle, and intrinsic safety.
At present, hybrid solid-liquid and gel batteries are more developed, which can take into account the advantages of liquid batteries and all-solid batteries, but the shortcomings of liquid electrolytes still determine the performance of batteries.

Method used

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  • Polymerizable electrolyte and preparation method and application thereof
  • Polymerizable electrolyte and preparation method and application thereof
  • Polymerizable electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] raw material

[0091] Preparation method: Under a nitrogen atmosphere, mix the raw material (0.88g, 0.01mol) and lithium hydroxide (0.24g, 0.01mol) with 10ml of methanol solution, and react at 15°C for 8 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 boron trifluoride diethyl ether complex (1.45g, 0.01mol) and 15ml THF (tetrahydrofuran) to the intermediate, stir and react at 40°C for 6 hours, and place the resulting mixture at 30°C and a vacuum of about -0.1MPa Drying under reduced pressure, the obtained crude product was filtered and dried with dichloromethane to obtain the product A1. The yield was 86%, NMR such as figure 1 shown.

Embodiment 2

[0093] raw material

[0094] Preparation method: Under nitrogen atmosphere, mix the raw material (0.90g, 0.01mol) and boron trifluoride tetrahydrofuran complex (1.40g, 0.01mol) in 15ml of ethylene glycol dimethyl ether, and react at room temperature for 10 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 A2. The yield was 80%, NMR such as figure 2 shown.

Embodiment 3

[0096] raw material

[0097] Preparation method: Under argon atmosphere, mix the raw material (1.15g, 0.01mol) and boron trifluoride etherate complex (1.49g, 0.0105mol) in 15mlTHF (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 6.25ml of butyllithium hexane solution (c=1.6mol / L) to the intermediate, stir and react at room temperature for 7 hours, and dry the resulting mixture under reduced pressure at 30°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 A3. The yield was 89%, NMR such as image 3 shown.

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Abstract

The invention provides a polymerizable electrolyte and a preparation method and application thereof. Wherein the electrolyte comprises boron trifluoride salt, and the structure of the boron trifluoride salt is as shown in a general formula I in the specification. The electrolyte provided by the invention has polymerizable groups and functional groups, so that the electrolyte has multiple applications in a battery, and can be used as a functional additive to form a passive film on the surface of an electrode to prevent the electrode from decomposing each component 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 a polymerizable electrolyte and its preparation method and application. Background technique [0002] Due to the advantages of high energy density, long life, and no memory effect, secondary batteries have developed rapidly and their application range has become wider and wider. At present, secondary batteries are mainly liquid batteries, but liquid batteries have low energy density and poor safety. The main reason is that the liquid electrolyte currently used has a narrow electrochemical window and cannot be used with high-voltage positive electrode materials (such as high-voltage lithium cobalt oxide, lithium nickel manganese oxide, etc.); organic solvents have low boiling points, and are prone to leakage, fire and explosion, etc. Dangerous; conventional salt is easy to decompose at high temperature (such as lithium hexafluorophosphate), easy to corrode aluminum foi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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