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Carbon aerogel-loaded selenium composite material and preparation method thereof, and lithium/sodium selenium cell

A technology of carbon airgel and composite materials, applied in the field of materials, can solve the problems of less reports, and achieve the effects of easy implementation, comprehensive performance and easy operation

Inactive Publication Date: 2019-05-14
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have explored many carbon materials, such as carbon nanotubes, carbon nanofibers, etc., but there are few reports on carbon aerogels as substrates for loading selenium.

Method used

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  • Carbon aerogel-loaded selenium composite material and preparation method thereof, and lithium/sodium selenium cell
  • Carbon aerogel-loaded selenium composite material and preparation method thereof, and lithium/sodium selenium cell
  • Carbon aerogel-loaded selenium composite material and preparation method thereof, and lithium/sodium selenium cell

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preparation example Construction

[0040] The present invention also provides a preparation method of the above-mentioned carbon airgel-loaded selenium composite material, comprising the following steps:

[0041] After the ground carbon airgel is mixed with the active material powder, heat treatment is carried out under vacuum condition to obtain the carbon airgel loaded selenium composite material.

[0042] For details, see figure 1 , figure 1 It is a schematic flow chart of the preparation process of the carbon airgel-loaded selenium composite material provided by the present invention.

[0043] The carbon aerogel prepared above is ground, and the present invention has no special limitation on the grinding method, and the grinding method known to those skilled in the art will suffice. Preferably, a grinder can be used for grinding.

[0044] Then, the ground carbon airgel is mixed with the active material powder for grinding to obtain a mixed powder;

[0045] The mixed powder is heat-treated under a vacuum...

Embodiment 1

[0054] This embodiment includes the following steps:

[0055] 1) In this embodiment, phenolic resin-based carbon airgel is selected. The preparation of carbon airgel is the same as that of patent CN108609607A, and it is recorded as NCA. The specific preparation method is: select resorcinol and furfural as carbon source, hexamethylenetetramine as organic basic catalyst, the volume ratio of resorcinol and furfural is 1:1.5, the mass of resorcinol and catalyst The ratio is 1:0.001. After fully stirring and mixing, react at 75° C. for 7 days to obtain a phenolic resin gel. Then take it out and raise the temperature to 900°C at a rate of 5°C / min in a tube furnace with argon gas and keep it for 3h. After the carbonized carbon aerogel is taken out after cooling down, it is activated by potassium hydroxide. The mass ratio of potassium hydroxide and carbon aerogel used is 5:1. Mix potassium hydroxide and carbon aerogel, add appropriate amount of water, and let stand overnight. Aft...

Embodiment 2

[0067] This embodiment includes the following steps:

[0068] 1) In this embodiment, phenolic resin-based carbon airgel is selected. The preparation of carbon airgel is the same as that of patent CN108609607A, and it is recorded as NCA. The specific preparation method is: select resorcinol and furfural as carbon source, hexamethylenetetramine as organic basic catalyst, the volume ratio of resorcinol and furfural is 1:1.5, the mass of resorcinol and catalyst The ratio is 1:0.001. After fully stirring and mixing, react at 75° C. for 7 days to obtain a phenolic resin gel. Then take it out and raise the temperature to 900°C at a rate of 5°C / min in a tube furnace with argon gas and keep it for 3h. After the carbonized carbon aerogel is taken out after cooling down, it is activated by potassium hydroxide. The mass ratio of potassium hydroxide and carbon aerogel used is 5:1. Mix potassium hydroxide and carbon aerogel, add appropriate amount of water, and let stand overnight. Aft...

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Abstract

The invention provides a carbon aerogel-loaded selenium composite material, which comprises carbon aerogel and active substances loaded in micropores of the carbon aerogel, wherein the active substances are selected from one or more of sulfur, selenium particles and selenium sulfide particles. According to the carbon aerogel-loaded selenium composite material, the adsorption property of the porousstructure of the carbon aerogel to limit the active substance particles in the porous structure of the carbon aerogel, thereby significantly reducing the shuttle effect of a polyselenide. Meanwhile,the method is easy and convenient to implement, easy to implement and has the feasibility of industrial production; and no impurities are generated in the composite material synthesis process, thus ensuring the comprehensive performance of the composite material.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a carbon airgel-loaded selenium composite material, a preparation method thereof, and a lithium / sodium-selenium battery. Background technique [0002] At present, lithium-ion batteries have been widely used in electric vehicles, portable electronic devices, and large-scale energy storage devices, but their energy density is not high enough, which limits their further development. Lithium-sulfur batteries have a high theoretical specific capacity (1672mAhg -1 ) and high energy density (2600W h kg -1 ) has attracted much attention and is considered to be one of the most promising next-generation high-energy energy storage systems. At the same time, Na-ion batteries and room-temperature Na-S batteries have also been extensively studied due to the abundance and relatively low price of Na. However, lithium-sulfur batteries and sodium-sulfur batteries are accompanied b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052H01M10/05
CPCY02E60/10
Inventor 张和平邓玉睿程旭东龚伦伦
Owner UNIV OF SCI & TECH OF CHINA
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