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Preparation method and application for pitch-based hard carbon nanosheet

A nanosheet, asphalt-based technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex preparation process, restricting wide-scale application, easy to pollute the environment, etc., and achieve rich sources. , excellent cycle performance, low price effect

Active Publication Date: 2016-11-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional carbon nanosheets use metal oxides as templates. After carbonization, pickling is required to remove the templates. The preparation process is complicated and easy to pollute the environment, which restricts its wide-scale application.

Method used

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  • Preparation method and application for pitch-based hard carbon nanosheet
  • Preparation method and application for pitch-based hard carbon nanosheet
  • Preparation method and application for pitch-based hard carbon nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1. Add 100g of medium-temperature coal tar pitch into a round-bottomed flask, heat it in an oil bath until it melts, add 30g of p-toluenedimethanol, mix well, add 5g of p-toluenesulfonic acid, continue heating to 160°C for 3 hours, and the system is Viscous liquid, take out after cooling to room temperature.

[0020] Step 2. Put 20g of sodium chloride into a ball mill jar, add an appropriate amount of zirconia balls to it, add 12g of ethanol, and mill at a speed of 400rpm for 4 hours. After taking out the mixture, evaporate the ethanol to dryness, and separate the sample from the zirconia balls to obtain micron grade sodium chloride template.

[0021] Step 3. Dissolve 2 g of the modified asphalt powder prepared in step 1 in 30 g of NMP, add 20 g of the sodium chloride template prepared in step 2, heat and evaporate the NMP in an oil bath at 200° C. to dryness. Carbonize the obtained mixture, raise the temperature to 650°C at 5°C / min under the protection of nitroge...

Embodiment 2

[0024] Step 1. Add 100g of medium-temperature coal tar pitch into a round-bottomed flask, heat it in an oil bath until it melts, add 30g of p-toluenedimethanol, mix well, add 7g of p-toluenesulfonic acid, continue heating to 160°C for 3 hours, and the system is Viscous liquid, take out after cooling to room temperature.

[0025] Step 2. Put 20g of sodium chloride into a ball mill jar, add an appropriate amount of zirconia balls to it, add 10g of ethanol, and mill at a speed of 400rpm for 4 hours. After taking out the mixture, evaporate the ethanol to dryness, and separate the sample from the zirconia balls to obtain micron grade sodium chloride template.

[0026] Step 3. Dissolve 2 g of the modified asphalt powder prepared in step 1 in 40 g of NMP, add 20 g of the sodium chloride template prepared in step 2, and evaporate the NMP to dryness in an oil bath at 200° C. Carbonize the obtained mixture, raise the temperature to 750°C at 5°C / min under the protection of nitrogen in a...

Embodiment 3

[0029] Step 1. Add 100g of medium-temperature coal tar pitch into a round-bottomed flask, heat it in an oil bath until it melts, add 30g of p-toluenedimethanol, mix well, add 7g of p-toluenesulfonic acid, continue heating to 170°C for 2 hours, and the system is Viscous liquid, take out after cooling to room temperature.

[0030] Step 2. Put 20g of sodium chloride into a ball mill jar, add an appropriate amount of zirconia balls to it, add 8g of ethanol, and ball mill for 5 hours at a speed of 300rpm. After taking out the mixture, evaporate the ethanol to dryness, and separate the sample from the zirconia balls to obtain micron grade sodium chloride template.

[0031] Step 3. Dissolve 2 g of the modified asphalt powder prepared in step 1 in 35 g of NMP, add 40 g of the sodium chloride template prepared in step 2, and evaporate the NMP to dryness in an oil bath at 200° C. Carbonize the obtained mixture, raise the temperature to 850°C at 5°C / min under the protection of nitrogen ...

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Abstract

The invention relates to the preparation technical field of a carbon material, and discloses a preparation method and an application for a pitch-based hard carbon nanosheet. The preparation method comprises the following processes of performing a cross-linking reaction by taking medium temperature coal pitch as the raw material, taking terephthalyl alcohol as the cross-linking agent, and taking para-toluenesulfonic acid as the catalyst at a temperature of 100-170 DEG C to prepare hard carbon precursor modified pitch; then carrying out mixing, ball milling and drying on sodium chloride and ethyl alcohol to obtain a micron-level sodium chloride template; and finally dissolving the modified pitch into n-methyl-pyrrolidone, and mixing with the sodium chloride template according to certain proportion, and performing carbonization at a temperature of 650-850 DEG C, and water washing to obtain the pitch-based hard carbon nanosheet which is applied to the negative electrode of a sodium ion battery. The preparation method provided by the invention is simple and feasible; a step of acid washing to remove the template is not required in the preparation process of the carbon nanosheet, so that an effect of green and environment protection is achieved; the sodium chloride template and the n-methyl-pyrrolidone solvent can be recycled, so that the production cost is relatively low; and when the pitch-based hard carbon nanosheet prepared by the invention is used as the negative electrode material of the sodium ion battery, relatively high reversible sodium storage capacity, relatively high rate capability and excellent cycling stability are represented.

Description

technical field [0001] The invention relates to a preparation method and application of pitch-based hard carbon nanosheets, belonging to the technical field of carbon material preparation. Background technique [0002] Lithium-ion batteries have become the first choice for small-scale energy storage systems such as portable electronic devices and electric vehicles due to their high operating voltage, large capacity, and long cycle life. However, lithium reserves in the earth's crust are small and unevenly distributed, which cannot meet the huge demand of future energy storage systems. Sodium and lithium belong to the same main group, with similar chemical properties and abundant reserves. The production cost of sodium-ion batteries will be much lower than that of lithium-ion batteries. It is reasonable to develop sodium-ion batteries as a substitute for lithium-ion batteries for large-scale energy storage systems. feasible. [0003] Due to the large radius of sodium ions, ...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/054C01B31/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/587H01M10/054Y02E60/10
Inventor 邱介山王玉伟肖南郝明远
Owner DALIAN UNIV OF TECH
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