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COF (covalent organic framework) coated separator as well as preparation method and application thereof

A covalent organic framework and coating technology, applied in the field of electrochemistry, can solve the problems of battery short circuit, low specific capacity, poor stability, etc., and achieve the effect of strong applicability, simple process and improved cycle stability.

Inactive Publication Date: 2018-08-21
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] As people's demand for energy is increasing, lithium-selenium disulfide batteries are expected to replace lithium-ion batteries as energy storage due to their simple and easy-to-obtain raw materials, high theoretical specific capacity and high energy density, which has greatly attracted scientists. Lithium-selenium disulfide battery has high theoretical specific capacity and high energy density due to its simple and easy-to-obtain raw materials, but the intermediate product generated during the cycle of lithium-selenium disulfide battery dissolves in the electrolyte and causes a shuttle effect
At the same time, the lithium negative electrode will form lithium dendrites, which will pierce the common diaphragm during the cycle, so that the positive and negative electrodes will contact each other and cause the internal short circuit of the battery. , poor stability and other issues

Method used

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  • COF (covalent organic framework) coated separator as well as preparation method and application thereof
  • COF (covalent organic framework) coated separator as well as preparation method and application thereof
  • COF (covalent organic framework) coated separator as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation of Covalent Organic Framework Coated Separator

[0042] A method for preparing a covalent organic framework coating separator, specifically, comprising the following steps:

[0043] S1. Synthesis of TPB-DMTP-COF

[0044] Take 1,3,5-(4-aminobenzene)benzene and 2,5-dimethoxyterephthalaldehyde with a molar ratio of 2:3, and add organic solvent 1,3,5- Mesitylene and 1,4-dioxane, then add 6mol / L acetic acid solution, the amount added is 1 / 10 of the total volume of the above two organic solvents; then pass through argon and seal it, put the above mixed solution React in an oven at 110°C for 72 hours, and then wash with 1,4-dioxane, tetrahydrofuran and acetone to obtain TPB-DMTP-COF yellow powder, as shown in the attached figure 1 and 2 shown.

[0045] S2. Preparation of Covalent Organic Framework TPB-DMTP-COF Coated Separator

[0046] The TPB-DMTP-COF synthesized in step (1), super-P and LA132 with a mass fraction of 5% are fully mixed in a mass rat...

Embodiment 2

[0047] Example 2 Preparation of Covalent Organic Framework Coated Separator

[0048] A method for preparing a covalent organic framework coating separator, specifically, comprising the following steps:

[0049] S1. Synthesis of TPB-DMTP-COF

[0050] Take 1,3,5-(4-aminobenzene)benzene and 2,5-dimethoxyterephthalaldehyde with a molar ratio of 2:3, and add organic solvent 1,3,5- Mesitylene and 1,4-dioxane, then add 6mol / L acetic acid solution, the amount added is 1 / 10 of the total volume of the above two organic solvents; then pass through argon and seal it, put the above mixed solution React in an oven at 80°C for 72 hours, and then wash with 1,4-dioxane, tetrahydrofuran and acetone respectively to obtain TPB-DMTP-COF yellow powder.

[0051] S2. Preparation of Covalent Organic Framework TPB-DMTP-COF Coated Separator

[0052] The TPB-DMTP-COF synthesized in step (1), super-P and LA132 with a mass fraction of 5% are fully mixed in a mass ratio of 6:2:2, and then 2-3ml of n-prop...

Embodiment 3

[0053] Example 3 Preparation of Covalent Organic Framework Coated Separator

[0054] A method for preparing a covalent organic framework coating separator, specifically, comprising the following steps:

[0055] S1. Synthesis of TPB-DMTP-COF

[0056] Take 1,3,5-(4-aminobenzene)benzene and 2,5-dimethoxyterephthalaldehyde with a molar ratio of 2:3, and add organic solvent 1,3,5- Mesitylene and 1,4-dioxane, then add 6mol / L acetic acid solution, the amount added is 1 / 10 of the total volume of the above two organic solvents; then pass through argon and seal it, put the above mixed solution React in an oven at a temperature of 150° C. for 72 hours, and then wash with 1,4-dioxane, tetrahydrofuran and acetone respectively to obtain TPB-DMTP-COF yellow powder.

[0057] S2. Preparation of Covalent Organic Framework TPB-DMTP-COF Coated Separator

[0058] The TPB-DMTP-COF synthesized in step (1), super-P and LA132 with a mass fraction of 5% are fully mixed in a mass ratio of 6:2:2, and ...

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Abstract

The invention discloses a COF (covalent organic framework) coated separator as well as a preparation method and an application thereof. The method comprises the following steps: firstly, synthesizingTPB-DMTP-COF, then sufficiently mixing the TPB-DMTP-COF, conductive carbon black and a water-based binder in the mass ratio being 6:2:2, dropwise adding 2-3 ml of an n-propyl alcohol aqueous solutioncontaining n-propyl alcohol and water in a volume ratio being 3:1, uniformly mixing the substances, applying the obtained mixture to a ceramic separator, and drying the separator in a vacuum drying oven at 55 DEG C to obtain the TPB-DMTP-COF coated separator by baking. The separator can effectively inhibit a shuttle effect and be prevented from being pierced by lithium dendrites when applied to alithium-selenium sulfide battery, cyclic stability and specific capacity of the battery are improved, the capacity can still be kept at 690 mAh / g after 100 cycles under the current density of 0.5C (1C=1124 mAh / g), electrochemical performance of the battery is improved greatly, and the preparation method adopts a simple process and is high in applicability.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a covalent organic frame coating diaphragm, a preparation method and application thereof, which are used for preparing a novel lithium-selenium disulfide battery. Background technique [0002] As people's demand for energy is increasing, lithium-selenium disulfide batteries are expected to replace lithium-ion batteries as energy storage due to their simple and easy-to-obtain raw materials, high theoretical specific capacity and high energy density, which has greatly attracted scientists. Lithium-selenium disulfide battery has high theoretical specific capacity and high energy density due to its simple and easy-to-obtain raw materials, but the intermediate products generated during the cycle of lithium-selenium disulfide battery dissolve in the electrolyte and cause a shuttle effect. At the same time, the lithium negative electrode will form lithium dendrites,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/052H01M50/403H01M50/406H01M50/411
CPCH01M10/052H01M50/403H01M50/409H01M50/463Y02E60/10
Inventor 蔡跃鹏杨焱王健宜
Owner SOUTH CHINA NORMAL UNIVERSITY
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