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Alpha-Ni (OH) 2 (at) S (at) PANI sulfur positive electrode composite material and preparation method thereof

A composite material and sulfur cathode technology, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor cycle performance of sulfur cathode materials, and achieve industrialized large-scale production, simple process methods, and environmental friendliness.

Pending Publication Date: 2022-05-27
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome above-mentioned technical deficiency, proposes a kind of α-Ni(OH) 2 @S@PANI sulfur cathode composite material and its preparation method solve the technical problem of poor cycle performance of sulfur cathode materials in the prior art

Method used

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  • Alpha-Ni (OH) 2 (at) S (at) PANI sulfur positive electrode composite material and preparation method thereof
  • Alpha-Ni (OH) 2 (at) S (at) PANI sulfur positive electrode composite material and preparation method thereof
  • Alpha-Ni (OH) 2 (at) S (at) PANI sulfur positive electrode composite material and preparation method thereof

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preparation example Construction

[0021] A second aspect of the present invention provides an α-Ni(OH) 2 The preparation method of @S@PANI sulfur cathode composite includes the following steps:

[0022] S1, obtaining polyaniline hollow nanoparticles;

[0023] S2, coating sulfur on the surface of polyaniline hollow nanoparticles to obtain sulfur-coated polyaniline hollow nanoparticles S@PANI;

[0024] S3. α-Ni(OH) was obtained by modifying α-nickel hydroxide on the surface of sulfur-coated polyaniline hollow nanoparticles S@PANI 2 @S@PANI sulfur cathode composite.

[0025] In the present invention, the above-mentioned steps of obtaining polyaniline hollow nanoparticles include: dispersing phosphoric acid, aniline, hydrogen peroxide, and ferric trichloride hexahydrate into deionized water, stirring uniformly, and performing a first hydrothermal reaction, and then filtering, Wash and dry to obtain polyaniline hollow nanoparticles. Among them, the mass fraction of phosphoric acid is 95%-99%, the volume ratio o...

Embodiment 1

[0029] An α-Ni(OH) 2 The preparation method of @S@PANI sulfur cathode composite includes the following steps:

[0030] (1) Add 5.5 mL of phosphoric acid (mass fraction of 98%) to 100 mL of deionized water, stir and mix for 10 min with an electromagnetic stirrer, then add 0.465 g of aniline, stir until aniline is dissolved, add 1.135 g of hydrogen peroxide (mass fraction of 25 %), 0.016g of ferric trichloride hexahydrate, stirred for 10min, then put the mixed solution into the hydrothermal reaction kettle, set the reaction conditions of the drying box to be 140°C, and the heating time to be 6h to carry out the reaction; after the reaction, the The product was repeatedly suction filtered and washed with deionized water and anhydrous ethanol, and the obtained precipitate was placed in a drying oven and dried at 70° C. for more than 12 hours to obtain polyaniline hollow nanoparticles, which were collected for later use.

[0031] (2) Add 1.6g of polyvinylpyrrolidone to 160mL of de...

Embodiment 2

[0035] Other conditions are the same as in Example 1, except that the amount of hydrogen peroxide in step (1) is 1.085 g.

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Abstract

The invention discloses an alpha-Ni (OH) 2 (at) S (at) PANI sulfur positive electrode composite material and a preparation method thereof. The alpha-Ni (OH) 2 (at) S (at) PANI sulfur positive electrode composite material sequentially comprises a core layer, an inner shell layer and an outer shell layer from inside to outside, wherein a core layer is made of polyaniline hollow nanoparticles, an inner shell layer is made of sulfur, and an outer shell layer is made of alpha-nickel hydroxide. The high-performance sulfur composite positive electrode material is prepared by taking polyaniline hollow nanoparticles as a core layer, sulfur as an inner shell layer and alpha-nickel hydroxide as an outer shell layer, and the electrode material combines the advantages of simple preparation, catalytic conversion, physical / chemical confinement and a hollow structure to effectively design a sulfur positive electrode; the obtained lithium-sulfur battery has the advantages of high specific capacity, good cycle performance, excellent rate capability and the like, and has a wide application prospect in the related fields of mobile communication, portable digital products, electric automobiles, energy storage equipment and the like; the whole process method is simple, mild in reaction condition, environment-friendly and easy for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of electrode material synthesis, in particular to an α-Ni(OH) 2 @S@PANI sulfur cathode composite and its preparation method. Background technique [0002] With the development of science and technology, people have more and more requirements for energy. But the Earth's fossil fuels are dwindling. Therefore, people want to seek new and clean energy that can replace fossil fuels. Lithium-sulfur batteries because of their material theoretical specific capacity and battery theoretical specific energy are as high as 1675mAh / g and 2600Wh / kg, which are much higher than the widely used lithium cobalt oxide batteries (150mAh / g) in commercial use. The application of scale has gradually attracted people's attention. However, the lithium-sulfur battery using elemental sulfur as the cathode material also has some shortcomings that hinder its commercialization, which is reflected in the following aspects: [0003] (1...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/60
CPCH01M4/366H01M4/38H01M4/62H01M4/624H01M4/68H01M2004/028Y02E60/10
Inventor 严敏黄睿张彩芸常晓宁刘治田
Owner WUHAN INSTITUTE OF TECHNOLOGY