A double-template multi-level porous carbon-based material and its preparation method and application

A porous carbon and dual-template technology, applied in the fields of nanomaterials and electrochemistry, can solve the problems of difficult to control the growth of the surface morphology of materials, and achieve the effects of good energy storage and easy preparation.

Active Publication Date: 2021-10-08
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This preparation method solves the problem that it is difficult to control the growth of material surface morphology in the existing process

Method used

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  • A double-template multi-level porous carbon-based material and its preparation method and application
  • A double-template multi-level porous carbon-based material and its preparation method and application
  • A double-template multi-level porous carbon-based material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1. Preparation of dual-template hierarchical porous carbon-based materials

[0037] Take 30mL of 100OD solidified Escherichia coli bacteria liquid and add it to 80mL of deionized water, stir to form a uniform bacterial suspension, then add 0.5g of cetyltrimethylammonium bromide and 0.8mL of saturated ammonia water, stir at 170rpm at 30°C 10min. Then add n-hexane, continue to stir for 10min, then add 2.5mL tetraethyl orthosilicate, stir for 12 hours.

[0038] After centrifugation, wash the mesoporous channels with ethanol for 3 hours, then collect by centrifugation, take 0.5g of the cleaned sample and spread it on the bottom of a 25mL beaker, add 1mL of ethanol dropwise and stir evenly, then add 1mL of aniline, sonicate for 5min, and add ammonium persulfate dropwise 9mL of sulfuric acid solution, while stirring continuously to make the reaction occur evenly, and then under the protection of argon, the heating rate was raised to 700°C at a rate of 5°C / min for carbonizati...

Embodiment 2

[0045] The only difference between Example 2 and Example 1 is that the amount of aniline added is 0.5 mL.

[0046] According to the method in Example 1, the multi-level porous carbon-based material prepared in this example was further prepared into an electrode, and assembled into a lithium-sulfur battery. The cycle test is carried out on the test instrument, and the obtained results are as follows: Figure 7-8 shown.

[0047] From Figure 7-8 It can be seen from the figure that the lithium-sulfur battery of this example has a capacity of up to 1000mAh / g in the first cycle at 0.2C, and after 100 stable cycles, it still maintains a capacity of 700mAh / g, showing excellent electrochemical performance.

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Abstract

The invention discloses a preparation method of a dual-template multi-level porous carbon-based material, comprising: using bacteria as a template, generating a mesoporous silica layer on the surface of the bacteria to obtain a mesoporous silica layer / bacteria composite template; and synthesizing a carbon source in the channels of the mesoporous silica layer, then carbonizing in a protective atmosphere, and then removing the mesoporous silica layer to obtain the dual-template hierarchical porous carbon-based material; The carbon source is selected from one of polyaniline, polypyrrole, dopamine, phenolic resin, and sucrose. The present invention also provides the dual-template hierarchical porous carbon-based material prepared by the method and its application. The template of the multi-level porous carbon-based material of the present invention is derived from bacteria that widely exist in life, is easy to prepare in large quantities, and is easy to implement in industrial production; and the selected material is non-toxic and harmless to the environment, and has almost no pollution; the preparation method solves the problem of The problem that it is difficult to control the growth of the surface morphology of the material in the existing process is solved.

Description

technical field [0001] The invention relates to the technical fields of nanometer materials and electrochemistry, in particular to a double-template multi-level porous carbon-based material and its preparation method and application. Background technique [0002] Sulfur is a non-metallic element widely present in nature, and elemental sulfur and sulfur compounds are widely present in various minerals and the atmosphere. Elemental sulfur has the characteristics of small relative molecular weight and large number of electrons transferred by reacting with lithium. The theoretical specific capacity of sulfur-lithium batteries using sulfur as the positive electrode material is as high as 1675mAh / g, and the theoretical energy density is as high as 2600Wh / kg, which is significantly higher than the current Commercial lithium-ion batteries. In addition, sulfur is cheap, environmentally friendly and readily available, and has broad application prospects in chemical power storage and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/62H01M10/052
CPCC01B32/05H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 赵晓辉李自惟王崇龙邓昭
Owner SUZHOU UNIV
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