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Preparation method and application of modified lignin-based hard carbon microspheres

A lignin-based, lignin-based technology, applied in the field of modified lignin-based hard carbon microspheres and its preparation, can solve the problems of high cost of hard carbon preparation and difficulty in commercial application

Inactive Publication Date: 2021-04-09
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high production cost of hard carbon in the prior art, difficulty in commercial application, and further improvement of its performance as an alkali metal ion battery negative electrode material, and to provide a modified lignin-based hard carbon microsphere. Preparation

Method used

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  • Preparation method and application of modified lignin-based hard carbon microspheres
  • Preparation method and application of modified lignin-based hard carbon microspheres
  • Preparation method and application of modified lignin-based hard carbon microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of lignin solution: Weigh sodium lignosulfonate and phenol into a beaker equipped with a magnet and 40 mL of distilled water, then place it on a magnetic stirrer and stir thoroughly at room temperature for 1 hour to obtain lignin with a solid content of 2%. prime solution.

[0040] Wherein, the mass of phenol in the lignin solution accounts for 30% of the total mass of sodium lignosulfonate and phenol.

[0041] 2. The lignin solution is transferred to a polytetrafluoroethylene reactor with a volume of 70mL, then the polytetrafluoroethylene reactor is put into a stainless steel hydrothermal kettle and sealed, and then the stainless steel hydrothermal kettle is placed in an oven Raise the temperature to 200°C and keep it warm for 14h. Turn off the power and cool down naturally.

[0042] 3. The solution obtained by the hydrothermal reaction was centrifuged and washed several times until the supernatant was colorless, and the black precipitate was taken and...

Embodiment 2

[0045]1. Preparation of lignin solution: Weigh sodium lignosulfonate and 3-aminophenol into a beaker with a magnet and 40mL of distilled water, then place it on a magnetic stirrer and stir at room temperature for 1 hour to obtain a solid content of 5 % lignin solution.

[0046] Wherein, the mass of 3-aminophenol in the lignin solution accounts for 10% of the total mass of sodium lignosulfonate and 3-aminophenol.

[0047] 2. The lignin solution is transferred to a polytetrafluoroethylene reactor with a volume of 70mL, then the polytetrafluoroethylene reactor is put into a stainless steel hydrothermal kettle and sealed, and then the stainless steel hydrothermal kettle is placed in an oven Raise the temperature to 250°C and keep it warm for 12h. Turn off the power and cool down naturally.

[0048] 3. The solution obtained by the hydrothermal reaction was centrifuged and washed several times until the supernatant was colorless, and the black precipitate was taken and dried in a ...

Embodiment 3

[0051] 1. Preparation of lignin solution: Weigh sodium lignosulfonate and resorcinol into a beaker equipped with magnets and 40mL distilled water, then place it on a magnetic stirrer and stir thoroughly at room temperature for 1 hour to obtain a solid content of 20%. lignin solution.

[0052] Wherein, the mass of 3-aminophenol in the lignin solution accounts for 70% of the total mass of sodium lignosulfonate and 3-aminophenol.

[0053] 2. The lignin solution is transferred to a polytetrafluoroethylene reactor with a volume of 70mL, then the polytetrafluoroethylene reactor is put into a stainless steel hydrothermal kettle and sealed, and then the stainless steel hydrothermal kettle is placed in an oven Raise the temperature to 120°C and keep it warm for 60h. Turn off the power and cool down naturally.

[0054] 3. The solution obtained by the hydrothermal reaction was centrifuged and washed several times until the supernatant was colorless, and the black precipitate was taken ...

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Abstract

The invention relates to preparation of a modified lignin-based hard carbon microsphere material, and belongs to the technical field of alkali metal ion battery negative electrode materials. The problems that in the prior art, the preparation cost of biomass hard carbon is high, and the performance of the biomass hard carbon serving as an alkali metal ion battery negative electrode material needs to be continuously improved are solved. The method comprises the following steps: carrying out hydrothermal reaction on a mixed solution of lignin and an organic matter monomer to obtain a hydrothermal carbon microsphere precursor, and carrying out high-temperature carbonization to obtain the modified lignin-based hard carbon microsphere. The modified lignin-based hard carbon microspheres are spherical, the particle size is 1-20 microns, the graphite interlayer spacing is 0.37-0.40nm, and the specific surface area is 1-300m<2> / g. The modified lignin-based hard carbon microspheres have large interlayer spacing, rich microporous structures and good conductivity, so that the alkali metal ion battery has high specific capacity and stable cycle performance. According to the method, the structure of the modified lignin-based hard carbon microspheres can be regulated and controlled by changing the amount and variety of the organic matter monomer.

Description

technical field [0001] The invention belongs to the technical field of alkali metal (Li / Na / K) ion batteries, and specifically relates to a modified lignin-based hard carbon microsphere, a preparation method thereof and an application in alkali metal ion batteries. Background technique [0002] In order to increase the effective utilization of intermittent renewable energy such as wind energy and solar energy to alleviate the consumption of fossil energy, the current society needs more efficient and cheaper energy storage technology, so energy storage based on rechargeable alkali metal ion batteries Technology shows considerable advantages. For example, lithium-ion batteries, which have been widely used in portable electronic devices, electric vehicles, and large-scale smart grids, have the advantages of high energy density and good cycle stability. However, the low reserves and uneven distribution of lithium on the earth lead to rising energy storage costs, making the devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525H01M10/054
CPCC01B32/05H01M4/587H01M10/0525H01M10/054H01M2004/021H01M2004/027C01P2004/32C01P2004/61C01P2004/03C01P2006/40Y02E60/10
Inventor 时志强范林林王静张桂芳
Owner TIANJIN POLYTECHNIC UNIV
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