Metal-doped hierarchical porous biochar with three-dimensional frame structure and preparation method of metal-doped hierarchical porous biochar

A technology of metal doping and hierarchical porosity, which is applied in the preparation/purification of carbon, structural parts, non-metallic elements, etc., can solve the problems of lack of macropores and ultra-large pores, and the inability to fully utilize the electrochemical performance of sulfur materials to achieve enhanced Effects of conductivity, improvement of electrochemical performance, and improvement of rate capability

Active Publication Date: 2021-01-29
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The macropore distribution of most biochars is mainly at the nanometer level, and the ultra-large pores are derived from the morphology characteristics of the biomass raw materials. Al

Method used

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  • Metal-doped hierarchical porous biochar with three-dimensional frame structure and preparation method of metal-doped hierarchical porous biochar
  • Metal-doped hierarchical porous biochar with three-dimensional frame structure and preparation method of metal-doped hierarchical porous biochar
  • Metal-doped hierarchical porous biochar with three-dimensional frame structure and preparation method of metal-doped hierarchical porous biochar

Examples

Experimental program
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Example Embodiment

[0032]Example 1

[0033](1) Using Tremella fungus as raw material, soaking and draining it, drying it, and crushing it into fine powder with a crusher to obtain freeze-dried Tremella powder. Then add 1g white fungus powder, 0.2g potassium hydroxide and 0.2g FeCl3(5:1:1), mix in 60mL deionized water, stir and ultrasonic until uniform and get a viscous mixture;

[0034](2) Use a high-shear emulsifier to shear emulsify the viscous mixture in (1) at a speed of 8000r / min and an emulsification time of 10min. Then place the emulsified mixture in a freeze dryer at minus 60°C for 4 hours, then seal the drying chamber and vacuum to make the pressure in the chamber 1Pa, dry for 48 hours, and dry thoroughly;

[0035](3) Put the dry powder in (2) into a porcelain boat, and use a tube furnace for high-temperature carbonization. The specific process steps of the heat treatment are as follows: at a heating rate of 5°C / min, heating to 100°C and holding for 1 hour, and then at a heating rate of 4°C / min, heati...

Example Embodiment

[0038]Example 2

[0039](1) Using sweet potatoes as raw materials, soaking them, draining them, drying them, and crushing them into fine powder with a crusher to obtain freeze-dried sweet potato powder. Then add 1g sweet potato flour, 0.2g potassium hydroxide and 0.2g FeCl3(5:1:1), mix in 60mL deionized water, stir and ultrasonic until uniform and obtain a viscous mixture;

[0040](2) Use a high-shear emulsifier to shear emulsify the viscous mixture in (1) at a speed of 8000r / min and an emulsification time of 10min. Then place the emulsified mixture in a freeze dryer at minus 60°C for 4 hours, then seal the drying chamber and vacuum to make the pressure in the chamber 1Pa, dry for 48 hours, and dry thoroughly;

[0041](3) Put the dry powder in (2) into a porcelain boat, and use a tube furnace for high-temperature carbonization. The specific process steps of the heat treatment are as follows: at a heating rate of 5°C / min, heating to 100°C and holding for 1 hour, and then at a heating rate of ...

Example Embodiment

[0044]Example 3

[0045](1) Using Tremella fungus as raw material, soaking and draining it, drying it, and crushing it into fine powder with a crusher to obtain freeze-dried Tremella powder. Then add 1g white fungus powder, 0.2g potassium hydroxide and 0.2g CoCl2·6H2O(5:1:1), mix in 60mL deionized water, stir and ultrasonic until uniform and obtain a viscous mixture;

[0046](2) Use a high-shear emulsifier to shear emulsify the viscous mixture in (1) at a speed of 8000r / min and an emulsification time of 10min. Then place the emulsified mixture in a freeze dryer at minus 60°C for 4 hours, then seal the drying chamber and vacuum to make the pressure in the chamber 1Pa, dry for 48 hours, and dry thoroughly;

[0047](3) Put the dry powder in (2) into a porcelain boat, and use a tube furnace for high-temperature carbonization. The specific process steps of the heat treatment are as follows: at a heating rate of 5°C / min, heating to 100°C and holding for 1 hour, and then at a heating rate of 4°C / mi...

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Abstract

The invention discloses metal-doped hierarchical porous biochar with a three-dimensional frame structure and a preparation method of the metal-doped hierarchical porous biochar. The preparation methodcomprises the steps of (1) soaking and draining a biomass raw material, drying, and grinding into powder for later use; (2) adding the biomass raw material powder, soluble metal salt and potassium hydroxide into deionized water, and performing stirring and ultrasonic treatment until the materials are uniformly mixed to obtain a mixed solution; (3) carrying out high-shear emulsification on the mixed solution to obtain an emulsion; and (4) carrying out freeze drying on the emulsion, carbonizing, pickling, filtering and drying to obtain the metal-doped hierarchical porous biochar with the three-dimensional frame structure. The metal-doped hierarchical porous biochar with the three-dimensional frame structure is rich in pore channel structure and can store a large amount of sulfur elements and effectively constrain the sulfur elements, part of amorphous carbon can be converted into graphitic carbon due to the existence of metal particles, the conductivity of a carbon material is enhanced,the synergistic effect of physicochemical adsorption of polysulfide can be achieved, the shuttle effect is effectively inhibited, and the electrochemical performance of the electrode material is improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a metal-doped three-dimensional frame structure hierarchical porous biochar and a preparation method thereof. Background technique [0002] Lithium-ion batteries are an excellent energy storage system, but currently commercialized lithium-ion batteries generally have the defect of low energy density. In the high-energy density lithium-ion battery system, the lithium-sulfur battery is one of the most promising next-generation power devices. It uses cheap, earth-abundant, and environmentally friendly sulfur as the cathode and has a high theoretical specific capacity (~1675mAh g -1 ) and energy density (~2600Wh kg -1 ), its specific capacity is about 5 times that of the current lithium-ion battery cathode material. However, so far, the commercial application of lithium-sulfur batteries is still challenging, because sulfur has poor electrical conductivity and ionic conductivity, so...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B32/914H01M4/62H01M10/052
CPCC01B32/05C01B32/914H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 雷维新王旭日马增胜许旭鹏汪啸吴雅琴付国立潘勇
Owner XIANGTAN UNIV
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