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Application of alkyl chain modified covalent organic framework membrane in lithium battery

A covalent organic framework, alkyl chain technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as prolonging the service life of lithium batteries, and achieve the effect of improving uniformity and stability and inhibiting growth.

Pending Publication Date: 2021-11-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods all inhibit the growth of lithium dendrites to a certain extent, thereby prolonging the service life of lithium batteries and maintaining a high capacity retention rate for a period of time, they only maintain about 85% of the capacity within 50 cycles. capacity

Method used

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  • Application of alkyl chain modified covalent organic framework membrane in lithium battery
  • Application of alkyl chain modified covalent organic framework membrane in lithium battery
  • Application of alkyl chain modified covalent organic framework membrane in lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]1. Synthesis of COF-C-2

[0046] (1) Synthesis by in-situ polymerization on the surface of copper foil, the specific steps are as follows:

[0047] Weigh 4.3mg amino compound (C-2,2-NHNH 2 ), into a 5mL glass tube, and 5mL of a mixed solution of 1,3-dioxane and ethylene glycol dimethyl ether (volume ratio 1:1). Weigh 2.8 mg of 1,3,5-triformylbenzene, a monomer containing aldehyde groups, into a 5 mL glass tube, and add 5 mL of triethylene glycol dimethyl ether. The two monomers were respectively dissolved in the solvent by ultrasonication, mixed, and then 0.1 mL of 3 mol / L acetic acid aqueous solution was added to the mixed solution. Finally, drop the mixed solution on the copper foil and let it stand for 24 hours to form a powdered COF-C-2 material. The synthesis route is as follows:

[0048]

[0049] (2) Synthesis by interfacial polymerization, the specific steps are as follows:

[0050] Weigh 0.1mmol of 1,3,5-triformylbenzene and dissolve in dichloromethane to ...

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Abstract

The invention provides application of an alkyl chain modified covalent organic framework membrane in a lithium battery. The alkyl chain modified covalent organic framework film has a structural formula shown in the description, and generation of lithium dendrites can be effectively inhibited by applying the alkyl chain modified covalent organic framework film to a lithium battery as a positive electrode material.

Description

technical field [0001] The invention belongs to the field of covalent organic framework compounds, and in particular relates to the application of an alkyl chain-modified covalent organic framework film in lithium batteries. Background technique [0002] Due to the use of a large amount of dangerous and toxic organic solvents such as flammable and explosive, commercial lithium-ion batteries have potential safety hazards such as short circuits and electrolyte leakage. One of the biggest factors leading to the explosion and leakage of lithium batteries is the growth of lithium dendrites. In the use of lithium batteries, due to the aging of the diaphragm and positive electrode materials, lithium dendrites grow slowly and gradually pierce the diaphragm, resulting in uneven distribution of the electrolyte, a sharp decline in thermal stability, and loss of effective components, resulting in battery failure and electrolyte leakage. , battery explosion, etc. Therefore, how to reas...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/62H01M10/0525C08G12/06
CPCH01M4/606H01M4/628H01M10/0525C08G12/06H01M2004/028Y02E60/10
Inventor 张根轩宇峰许冰清刘姿铔潘遥遥
Owner NANJING UNIV OF SCI & TECH
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