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Preparation method and use method of amorphous vanadium oxide/carbon fiber material for lithium-sulfur battery

A carbon fiber material, lithium-sulfur battery technology, applied in the direction of secondary battery repair/maintenance, secondary battery, electrochemical generator, etc., can solve the problem of reducing the energy density of the electrode, and achieve the effect of performance improvement and good conductivity

Active Publication Date: 2020-01-17
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding these carbon or metal compounds will reduce the energy density of the electrode, so more and more people have paid attention to the bare sulfur cathode in recent years

Method used

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  • Preparation method and use method of amorphous vanadium oxide/carbon fiber material for lithium-sulfur battery
  • Preparation method and use method of amorphous vanadium oxide/carbon fiber material for lithium-sulfur battery
  • Preparation method and use method of amorphous vanadium oxide/carbon fiber material for lithium-sulfur battery

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specific Embodiment approach 1

[0039] A method for preparing an amorphous vanadium oxide / carbon fiber material for lithium-sulfur batteries, comprising the steps of:

[0040] Step 1. Weigh vanadyl acetylacetonate, dimethylformamide, 4-4 diaminodiphenyl ether and pyromellitic anhydride of a certain quality respectively according to a certain solid-liquid ratio, and set aside;

[0041] Step 2. Add the dimethylformamide to the vanadyl acetylacetonate weighed in step 1, stir magnetically for a certain period of time, and after fully dissolving, add the 4-4 diaminodiphenyl ether , after ultrasonication for a certain period of time, adding the pyromellitic anhydride in stages under the condition of mechanical stirring, and stirring for a certain period of time to obtain a precursor solution for use;

[0042] Step 3. Electrospinning the precursor solution prepared in step 2 to obtain polymer fibers for use;

[0043] Step 4, place the polymer fiber prepared in step 3 in a tube furnace for heat treatment at 5°C min...

specific Embodiment approach 2

[0054] According to the method for preparing an amorphous vanadium oxide / carbon fiber material for lithium-sulfur batteries described in Embodiment 1, the method for using the amorphous vanadium oxide / carbon fiber material for lithium-sulfur batteries is prepared, The described amorphous vanadium oxide / carbon fiber material for lithium-sulfur batteries is made into a circular interlayer, which is placed between the diaphragm and the positive electrode of the lithium-sulfur battery.

[0055] A method for preparing an amorphous vanadium oxide / carbon fiber material for lithium-sulfur batteries described in this embodiment, and a method for using an amorphous vanadium oxide / carbon fiber material for lithium-sulfur batteries, said The preparation method of the positive electrode is to use sublimed sulfur powder as the positive electrode active material, Super-P as the conductive agent, and PVDF as the binder. After manual grinding in a mortar for 20 minutes, add 5% NMP solution, and...

specific Embodiment approach 3

[0065] A method for preparing an amorphous vanadium oxide / carbon fiber material for lithium-sulfur batteries, comprising the steps of:

[0066] Step 1. Weigh vanadyl acetylacetonate, dimethylformamide, 4-4 diaminodiphenyl ether and pyromellitic anhydride of a certain quality respectively according to a certain solid-liquid ratio, and set aside;

[0067] Step 2. Add the dimethylformamide to the vanadyl acetylacetonate weighed in step 1, stir magnetically for a certain period of time, and after fully dissolving, add the 4-4 diaminodiphenyl ether , after ultrasonication for a certain period of time, adding the pyromellitic anhydride in stages under the condition of mechanical stirring, and stirring for a certain period of time to obtain a precursor solution for use;

[0068] Step 3. Electrospinning the precursor solution prepared in step 2 to obtain polymer fibers for use;

[0069] Step 4, place the polymer fiber prepared in step 3 in a tube furnace for heat treatment at 5°C min...

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Abstract

The invention discloses a preparation method and a use method of an amorphous vanadium oxide / carbon fiber material for a lithium-sulfur battery, and belongs to the field of lithium-sulfur batteries. The preparation method comprises the following steps of adding the dimethyl formamide into the weighed vanadyl acetylacetonate; stirring with a magnetic force for a certain period of time, dissolving sufficiently, and adding the 4-4 diaminodiphenyl ether, adding the pyromellitic dianhydride in batches under a mechanical stirring condition after carrying out ultrasonic treatment for a certain periodof time, stirring for a certain period of time to obtain a precursor solution, carrying out high-temperature treatment after electrostatic spinning, converting the precursor solution into a nanofibernet containing amorphous vanadium oxide through the steps of high-temperature carbonization and the like, and using the nanofiber net as an additive layer of the lithium-sulfur battery. The fiber interlayer plays a good role in limiting an intermediate product of the lithium-sulfur battery and provides the good electrical conductivity, a binder and a conductive agent do not need to be added whenthe interlayer is prepared, and the subsequent battery performance tests also prove that the interlayer greatly improves the performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries; in particular, it relates to a method for preparing an amorphous vanadium oxide / carbon fiber material used for lithium-sulfur batteries and a method for using the same. Background technique [0002] In recent years, the excessive exploitation and use of non-renewable energy sources such as fossil fuels has caused serious environmental pollution and global warming. Therefore, the development of renewable and clean energy technologies is a major problem facing scientists in the 21st century. Lithium-ion batteries with high energy density and long cycle life have been widely used in mobile phones, computers and new energy vehicles in the past 20 years. However, with the increase in cost caused by the shortage of lithium resources and the higher demand for technical parameters such as specific capacity and cycle performance of lithium-ion batteries, scientists have been working on developing m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 陈明华李天禹梁心琪陈庆国
Owner HARBIN UNIV OF SCI & TECH
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