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Three-dimensional porous carbon composite material for lithium-sulfur battery and preparation method of three-dimensional porous carbon composite material

A carbon composite material, three-dimensional porous technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of complex experimental conditions, toxic raw materials, environmental pollution, etc., meet the experimental conditions and the preparation method is simple, good conductivity And chemical stability, the effect that is beneficial to transformation

Active Publication Date: 2022-07-08
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw material sulfur source in the synthesis process is toxic and pollutes the environment. At the same time, temperature control is required during the reaction process, and the reaction process is relatively complicated.
[0006] In summary, the existing problems in the prior art mainly include: some existing technologies have low sulfur loading and small specific surface area, which will cause the specific capacity of the electrode to be low; some existing technologies have complicated experimental conditions and toxic raw materials , pollutes the environment and is not conducive to commercial development

Method used

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  • Three-dimensional porous carbon composite material for lithium-sulfur battery and preparation method of three-dimensional porous carbon composite material
  • Three-dimensional porous carbon composite material for lithium-sulfur battery and preparation method of three-dimensional porous carbon composite material
  • Three-dimensional porous carbon composite material for lithium-sulfur battery and preparation method of three-dimensional porous carbon composite material

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preparation example Construction

[0041] In the preparation method of the three-dimensional porous carbon composite material of the present invention, firstly, the polyacrylamide is dissolved in ultrapure water and becomes a gel under the action of magnetic stirring, and then the solution containing iron nitrate and nickel nitrate is slowly added dropwise to a In the gel, phytic acid and melamine are added to the mixture as phosphorus and nitrogen sources, and then under the action of high temperature, polyacrylamide will melt into a fluid, and iron nitrate and nickel nitrate will decompose to produce a large amount of gas. A large number of porous structures were formed when escaping from the molten polyacrylamide, and finally N, P co-doped 3D porous carbon composites were obtained.

[0042] The model of the material involved in the present invention and the source of purchase are described as follows:

[0043] Material name model source of purchase Polyacrylamide (PAM) Molecular weight: ...

Embodiment 1

[0045] In this embodiment, the preparation method of the three-dimensional porous carbon composite material includes the following steps:

[0046] (1) Under magnetic stirring at 280r / min, dissolve 0.142g of polyacrylamide in 120mL of ultrapure water, and stir for 60min until the solution forms a gel;

[0047] (2) under 450r / min magnetic stirring, 2mmol of ferric nitrate and 2mmol of nickel nitrate were added into 40mL of ultrapure water to dissolve, to form a solution containing ferric nitrate and nickel nitrate simultaneously, and then the solution containing ferric nitrate and nickel nitrate was added dropwise In the gel of step (1);

[0048] (3) 0.2mmol phytic acid and 7.5mmol melamine are added in the product of step (2) as phosphorus source and nitrogen source, and magnetic stirring 30min at 450r / min;

[0049] (4) Take the product of step (3), pour out the supernatant, put it in an oven, and dry it at 90°C for 10h;

[0050] (5) The powder obtained in step (4) is ground ...

Embodiment 2

[0060] In Example 2, the preparation method of the three-dimensional porous carbon composite material is basically the same as the method in Example 1, and the difference lies in step (2). Step (2) is to add 3mmol ferric nitrate and 3mmol nickel nitrate to 40mL ultrapure water respectively under 450r / min magnetic stirring to dissolve, form the solution containing ferric nitrate and nickel nitrate simultaneously, then the solution containing ferric nitrate and nickel nitrate is formed. Drop into the gel of step (1).

[0061] The properties of the material prepared in Example 2 are basically the same as those in Example 1.

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Abstract

The invention provides a three-dimensional porous carbon composite material for a lithium-sulfur battery and a preparation method of the three-dimensional porous carbon composite material. The preparation method provided by the invention comprises the following steps: 1) dissolving polyacrylamide in ultrapure water, and forming a gel substance under the action of magnetic stirring; 2) adding ferric nitrate and nickel nitrate into ultrapure water for dissolving, then dropwise adding a solution simultaneously containing ferric nitrate and nickel nitrate into the gelatinous substance obtained in the step 1), and then adding phytic acid and melamine as a phosphorus source and a nitrogen source into the mixture; (3) pouring out supernate from the mixture obtained in the step (2), drying in a drying oven, and heating a product obtained by drying in a tubular furnace at high temperature; and 4) immersing the sample obtained in the step 3) in a sulfuric acid solution to remove inactive substances, and finally centrifugally drying the sample to obtain the final product. The prepared material has a high-conductivity three-dimensional porous carbon skeleton, can adsorb soluble polysulfide, and can promote electron transfer so as to improve reaction kinetics.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a three-dimensional porous carbon composite material for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the continuous improvement of living standards, people's interest in advanced energy storage devices with high energy density and portable electronic products has grown rapidly. Lithium-sulfur batteries are widely regarded as one of the most competitive energy storage systems due to their high energy density, low cost, and environmental friendliness. Then, the commercial application of lithium-sulfur batteries is also hindered by many disadvantages, among which, in terms of sulfur cathodes, firstly, sulfur and lithium sulfide have low electronic and ionic insulation and electrical conductivity, which can lead to poor utilization of active materials as well as discharge Capacity is limited. Then, the high-order lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62
CPCH01M4/625H01M4/602H01M4/364Y02E60/10
Inventor 冯晓苗方亚男封越
Owner NANJING UNIV OF POSTS & TELECOMM
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