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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 electron and ion transport electrochemical reactions, etc., to achieve excellent electrochemical performance, Improved thermal stability, high electrolyte liquid absorption and liquid retention effects

Inactive Publication Date: 2018-11-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Functional lithium-sulfur battery diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0027] A functional lithium-sulfur battery diaphragm is a nanofiber membrane with carboxyl groups, and the nanofiber membrane is obtained by electrospinning a polyamic acid solution formed by polymerizing commercial diamine and dianhydride monomers.

[0028] The preparation method of the above-mentioned functional lithium-sulfur battery diaphragm is as follows:

[0029] Step 1: Prepare polyamic acid resin material: Add 0.96g p-phenylenediamine and 0.69g dianhydride monomer ODPA, 14.5mL reaction solvent NMP into a 50mL three-necked flask equipped with mechanical stirring, reflux condenser and nitrogen inlet and outlet and an appropriate amount of catalyst isoquinoline 0.5ml, stirred at 0°C under the protection of nitrogen until the monomers were completely dissolved, and kept for 3 hours to obtain a polyamic acid solution.

[0030] The second step: slowly add the obtained polymer solution into the syringe, the diameter of the needle (ie spinneret) closely connected with the syr...

Embodiment 2

[0033] A functional lithium-sulfur battery diaphragm is a nanofiber membrane with carboxyl groups, and the nanofiber membrane is obtained by electrospinning a polyamic acid solution formed by polymerizing commercial diamine and dianhydride monomers.

[0034] The preparation method of the above-mentioned functional lithium-sulfur battery diaphragm is as follows:

[0035] Step 1: Prepare polyamic acid resin material: Add 0.85g of biphenyldiamine and 0.71g of dianhydride monomer PMDA to a 50mL three-necked flask equipped with mechanical stirring, reflux condenser and nitrogen inlet and outlet, and 15.5mL of reaction solvent NMP and an appropriate amount of catalyst triethylamine 0.5ml, stirred at 0°C under the protection of nitrogen until the monomers were completely dissolved, and kept for 5 hours to obtain a polyamic acid solution.

[0036] Step 2: Slowly add the obtained polymer solution into the syringe, the diameter of the needle (ie spinneret) closely connected with the syr...

Embodiment 3

[0039] A functional lithium-sulfur battery diaphragm is a nanofiber membrane with carboxyl groups, and the nanofiber membrane is obtained by electrospinning a polyamic acid solution formed by polymerizing commercial diamine and dianhydride monomers.

[0040] The preparation method of the above-mentioned functional lithium-sulfur battery diaphragm is as follows:

[0041]The first step: prepare polyamic acid resin material: add 0.73g dicyandiamide and 0.52g dianhydride monomer BPDA, 17mL reaction solvent NMP and An appropriate amount of catalyst isoquinoline 0.2ml was stirred under nitrogen protection at 0°C until the monomers were completely dissolved, and kept for 5 hours to obtain a polyamic acid solution.

[0042] Step 2: Slowly add the obtained polymer solution into the syringe, the diameter of the needle (ie spinneret) closely connected with the syringe is 0.45mm, and the solution supply rate of the needle is 0.2ml / h. A rotating disk covered with aluminum foil was used as...

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Abstract

The invention provides a functional lithium-sulfur battery diaphragm and a preparation method thereof. The functional lithium-sulfur battery diaphragm is characterized in that the functional lithium-sulfur battery diaphragm is a nano-fiber membrane with carboxyl; the nano-fiber membrane is obtained by carrying out electrostatic spinning and film formation on a polyamide acid solution formed by diamine and dianhydride monomers. A lithium-sulfur battery, which takes the prepared nano-fiber membrane as the diaphragm, can be directly used in hybrid cars, and the method provides a novel way of a polymer diaphragm for preparation and application of the lithium-sulfur battery. The novel functional lithium-sulfur battery diaphragm prepared by the method has important meaning in the aspect of electrochemical performance of the lithium-sulfur battery.

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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 刘天西雒香卢先博缪月娥
Owner DONGHUA UNIV
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