A kind of functional diaphragm and its preparation method and application

A membrane and functional technology, applied in the field of functional membrane and its preparation, to achieve the effects of improving safety and stability, easy to scale, and prolonging the nucleation time

Active Publication Date: 2022-08-02
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anionic covalent organic framework (COF) in the functional separator provided by the present invention inhibits the transmission of lithium salt anions through electrostatic interaction, while the open one-dimensional nanopores of COF ensure the rapid transmission of lithium ions in the battery. Lithium dendrite problem solved

Method used

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  • A kind of functional diaphragm and its preparation method and application
  • A kind of functional diaphragm and its preparation method and application
  • A kind of functional diaphragm and its preparation method and application

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preparation example Construction

[0069] The present invention also provides the preparation method of the functional diaphragm described in the above technical solution, comprising the following steps:

[0070] Mixing the anionic covalent organic framework, polyvinylidene fluoride (PVDF) and N-methylpyrrolidone (NMP) to obtain a slurry;

[0071] The slurry is coated on the surface of the separator to obtain the functional separator.

[0072] In the present invention, the anionic covalent organic framework, polyvinylidene fluoride and N-methylpyrrolidone are mixed to obtain slurry.

[0073] In the present invention, the mixing is preferably performed under the condition of magnetic stirring, the time of the magnetic stirring is preferably 6-12 h, and the rotation speed is preferably 200-300 rpm.

[0074] After the slurry is obtained, the present invention coats the slurry on the surface of the separator to obtain the functional separator.

[0075] In the present invention, the coating is preferably performed...

Embodiment 1

[0081] An anionic covalent organic framework modified functional separator (COF-COOH@PP), which specifically includes the following steps:

[0082] Step 1: The monomers 2,4,6-trihydroxy-1,3,5-benzenetricarbaldehyde (63.0 mg) and 4,4'-diamino-1,1'-biphenyl-3,3'- Dicarboxylic acid (122.5mg) was mixed into a rigid ampoule, and 1,4-dioxane (1mL) and 1,3,5-trimethylbenzene (3mL) were added to the ampoule in a volume ratio of 1:3. ), ultrasonicating the ampoule containing the mixed solution for 10 minutes to make the above solution evenly mixed; after adding 0.6 mL of 6M acetic acid aqueous solution dropwise to the solution, the ampoule containing the mixed solution was placed in liquid nitrogen for freezing. To remove excess air and moisture in the ampoules that could affect the reaction, the ampoules were vacuum-thawed-frozen three times. After the impurities are exhausted, use the oil pump to vacuum again, and vacuum seal under the condition that the inside of the ampoule is vac...

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Abstract

The invention provides a functional separator and a preparation method and application thereof, belonging to the technical field of lithium metal battery separators. The invention provides a functional separator, comprising a separator and a dense modified layer arranged in layers, wherein the dense modified layer contains an anionic covalent organic framework and polyvinylidene fluoride. The invention proposes an anionic covalent organic framework modified functional separator. The COF in the anionic COF dense modified layer can hinder the shuttle of lithium salt anions through electrostatic interaction, prolong the nucleation time of lithium dendrites, and improve the The safety and stability of the battery; the use of one-dimensional nano-open pores of COF can significantly improve the transport of lithium ions in the dense modified layer, and improve the lithium ion migration number and cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium metal battery separators, in particular to a functional separator and a preparation method and application thereof. Background technique [0002] Due to the high activity and poor chemical / electrochemical stability of lithium metal electrodes in lithium metal batteries, lithium dendrites are easily formed during the continuous lithium deposition / stripping process, which destroys the solid electrolyte interface (SEI) film and aggravates side reactions. , which continuously consumes the lithium metal negative electrode, and even generates "dead lithium", which eventually leads to the reduction of Coulombic efficiency, resulting in irreversible capacity loss and deterioration of battery cycle performance. In more serious cases, the dendrites can also pierce the separator to make the positive and negative electrodes contact, causing a short circuit in the battery, resulting in thermal runaway, causing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/426H01M50/403H01M10/052
CPCH01M50/449H01M50/426H01M50/403H01M10/052Y02E60/10
Inventor 郭洪安琪孙勇疆赵根福
Owner YUNNAN UNIV
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