A kind of functional lithium-sulfur battery diaphragm and preparation method thereof

A lithium-sulfur battery, functional technology, applied in the field of lithium-sulfur battery diaphragm and its preparation, can solve the problems of lithium-sulfur battery actual capacity reduction, attenuation, hindering electrons, ion transport electrochemical reactions, etc., to achieve high-efficiency chemical adsorption and physical Barrier, high dielectric constant, effects of suppressing shuttle effect

Active Publication Date: 2020-10-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially in lithium-sulfur batteries, since the positive electrode sulfur is gradually reduced to soluble polysulfides during charging and discharging, polysulfides inevitably dissolve and diffuse through the separator, and the further reduced low-level polysulfides are released in the separator, etc. Irreversible deposition in the dead volume greatly hinders electron and ion transport and further electrochemical reactions, resulting in reduced practical capacity and rapid decay of lithium-sulfur batteries

Method used

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  • A kind of functional lithium-sulfur battery diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0029] A functional lithium-sulfur battery separator is a nanofiber membrane formed by electrospinning a fluorine-containing polyimide resin material polymerized from a fluorine-containing diamine monomer and a dianhydride monomer.

[0030] The preparation method of the above-mentioned functional lithium-sulfur battery diaphragm is as follows:

[0031] Step 1: Prepare highly soluble fluorine-containing polyimide resin material: Add 0.96g of fluorine-containing diamine monomer 6FDA and 0.69g of dianhydride mono ODPA, 14.5mL reaction solvent NMP and 0.5ml catalyst isoquinoline, stirred at room temperature under the protection of nitrogen until the monomer was completely dissolved, using the stepwise heating method, slowly raised the temperature to 80°C for 2h, 120°C for 4h, 200°C Maintained for 10h to obtain a polymer solution.

[0032] The second step: slowly add the obtained polymer solution into the syringe, the diameter of the needle (ie spinneret) closely connected with th...

Embodiment 2

[0035] A functional lithium-sulfur battery separator is a nanofiber membrane formed by electrospinning a fluorine-containing polyimide resin material polymerized from a fluorine-containing diamine monomer and a dianhydride monomer.

[0036] The preparation method of the above-mentioned functional lithium-sulfur battery diaphragm is as follows:

[0037] Step 1: Prepare highly soluble fluorine-containing polyimide resin material: Add 0.85 g of fluorine-containing diamine monomer 2,2-bis[4 -(4-Aminophenylthio)phenyl]hexafluoropropane and 0.71g dianhydride monomer PMDA, 15.5mL reaction solvent NMP and 0.5ml catalyst triethylamine, stir at room temperature under nitrogen protection until the monomer is completely dissolved , using a stepwise heating method, the temperature was gradually raised to 80°C for 2h, 120°C for 4h, and 200°C for 10h to obtain a polymer solution.

[0038] Step 2: Slowly add the obtained polymer solution into the syringe, the diameter of the needle (ie spinn...

Embodiment 3

[0041] A functional lithium-sulfur battery separator is a nanofiber membrane formed by electrospinning a fluorine-containing polyimide resin material polymerized from a fluorine-containing diamine monomer and a dianhydride monomer.

[0042] The preparation method of the above-mentioned functional lithium-sulfur battery diaphragm is as follows:

[0043] Step 1: Prepare highly soluble fluorine-containing polyimide resin material: Add 0.73g of fluorine-containing diamine monomer 2,2-dihydroxybenzene into a 50mL three-necked flask equipped with mechanical stirring, reflux condenser and nitrogen inlet and outlet Base hexafluoropropane and 0.52g dianhydride monomer BPDA, 17mL reaction solvent NMP and appropriate amount of catalyst isoquinoline 0.2ml, stir at room temperature under nitrogen protection until the monomer is completely dissolved, adopt stepwise heating method, slowly raise the temperature to 80°C and maintain 2h, maintained at 120°C for 4h, and maintained at 200°C for 1...

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Abstract

The invention provides a functional lithium-sulfur battery diaphragm and a preparation method thereof. The functional lithium-sulfur battery separator is characterized in that it is a nanofiber membrane formed by electrospinning a fluorine-containing polyimide resin material polymerized from a fluorine-containing diamine monomer and a dianhydride monomer. The lithium-sulfur battery in which the nanofibrous membrane is a diaphragm prepared by the present invention can be directly used in a hybrid vehicle, and this method provides a new way for the preparation and application of polymer diaphragm gelation in lithium-sulfur batteries. The new functional lithium-sulfur battery separator prepared by this method is of great significance in the electrochemical performance of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to a lithium-sulfur battery diaphragm and a preparation method thereof, belonging to the technical field of lithium-sulfur battery diaphragms. Background technique [0002] With the increasingly serious global energy and environmental problems, the task of developing efficient, clean and renewable new energy has become very urgent. When elemental sulfur undergoes oxidation-reduction reactions, it gains and loses double electrons, and its theoretical specific capacity reaches 1672mAh g when it is used as a positive electrode material. -1 , the theoretical specific energy of the lithium-sulfur battery composed of metal lithium is as high as 2500Wh kg -1 . In addition, elemental sulfur is abundant in nature, cheap, and environmentally friendly, so it is one of the most potential new energy storage materials at present. The lithium-sulfur battery system is also regarded as a new generation of high energy density electrode material s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14C08G73/10H01M50/403H01M50/423H01M50/44
CPCC08G73/1042C08G73/1057C08G73/1064H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 刘天西雒香缪月娥
Owner DONGHUA UNIV
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