Hard carbon material and preparation method and application thereof

A hard carbon and pre-oxidation technology, which is applied in the preparation/purification of carbon, structural parts, electrical components, etc., can solve the problems of reduced material cycle stability, reduced sodium storage capacity of soft carbon, and high average potential of sodium storage. Large graphite crystallite interlayer spacing, reduced exfoliation, and good batch stability

Active Publication Date: 2022-05-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite anode materials widely used in lithium batteries require solvation and co-intercalation for sodium storage, resulting in reduced cycle stability of the material
Non-graphitized soft carbon exhibits certain sodium storage properties, but the first Coulombic efficiency is not high; graphitized soft carbon has a reduced sodium storage capacity and a higher average sodium storage potential

Method used

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  • Hard carbon material and preparation method and application thereof
  • Hard carbon material and preparation method and application thereof
  • Hard carbon material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for preparing a hard carbon material, comprising the steps of:

[0045] S100. Weigh 3.00g of phenolic resin and put it in a mortar, grind it for 5min-10min until it is ground into a fine powder, then put the ground phenolic resin fine powder into the crucible without covering the lid, and heat up at a rate of 3°C / min rate, heat up to 300°C, keep it warm for 2 hours, and take it out after natural cooling;

[0046] S200, grinding the pre-oxidized phenolic resin into powder in S100;

[0047] S300, microwave the powder in S200 for 20 minutes;

[0048] S400, put the powder obtained in S300 into a high-temperature tube furnace, pass a protective gas, such as argon, and use a heating rate of 5°C / min to raise the temperature to 1300°C, keep it for 2 hours, and cool naturally with the furnace to obtain a hard carbon material.

[0049] Such as figure 1 As shown, the hard carbon material obtained in this embodiment is a regular and uniform spherical shape, compared to ...

Embodiment 2

[0053] A method for preparing a hard carbon material, comprising the steps of:

[0054] S100. Weigh 3.00g of the commercial precursor and place it in a mortar, grind it for 5-10 minutes until it is ground into a fine powder state. The commercial precursor uses the precursor purchased by Shandong Zibo Yide Company as the carbon source, and then the ground Put the fine powder of the commercial precursor into the crucible without a lid, raise the temperature to 200°C at a heating rate of 3°C / min, keep it warm for 2 hours, and take it out after natural cooling;

[0055] S200, grinding the pre-oxidized commercial precursor in S100 into powder;

[0056] S300, microwave the powder in S200 for 60 minutes;

[0057]S400, put the powder obtained in S300 into a high-temperature tube furnace, pass a protective gas, such as argon, and use a heating rate of 5°C / min to raise the temperature to 1300°C, keep it for 2 hours, and cool naturally with the furnace to obtain a hard carbon material. ...

Embodiment 3

[0062] A method for preparing a hard carbon material, comprising the steps of:

[0063] S100. Weigh 3.00g of starch and place it in a mortar, grind it for 5min-10min until it is ground into a fine powder state, then put the ground starch fine powder into the crucible without covering the lid, at a heating rate of 3°C / min, Raise the temperature to 200°C, keep it warm for 4 hours, and take it out after natural cooling, wherein the starch can be corn starch;

[0064] S200, grinding the pre-oxidized starch in S100 into powder;

[0065] S300, microwave the powder in S200 for 10 minutes;

[0066] S400, put the powder obtained in S300 into a high-temperature tube furnace, pass a protective gas, such as argon, and use a heating rate of 2°C / min to raise the temperature to 1300°C, keep it for 2 hours, and cool naturally with the furnace to obtain a hard carbon material.

[0067] After testing, the hard carbon material obtained in the embodiment of the present invention retains the ori...

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Abstract

The invention relates to a preparation method of a hard carbon material. The preparation method comprises the following steps: S100, pre-oxidizing a hard carbon precursor; s200, grinding the pre-oxidized hard carbon precursor into powder; s300, the powder is subjected to microwave treatment; and S400, calcining the powder obtained in S300 to obtain the hard carbon material. The hard carbon material is prepared by the preparation method. The hard carbon material prepared by the preparation method is applied to the negative electrode of the sodium-ion battery. The method has the advantages that the prepared hard carbon material serves as a sodium ion battery negative electrode material to be assembled into a sodium half-battery pair, within the voltage range of 0-2 V, the cycling stability is good, the initial reversible capacity reaches up to 370 mAh/g, the capacity retention rate reaches 95.9% after 50 cycles under the current density of 20 mA/g, compared with a traditional preparation method, the hard carbon specific capacity is obviously improved, and the method is simple and easy to implement. The method is low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for sodium ion batteries, in particular to a hard carbon material and a preparation method and application thereof. Background technique [0002] The development of sodium-ion battery technology is a national strategic demand, but also a market demand: [0003] On the one hand, lithium-ion battery technology continues to make breakthroughs. The proportion of lithium batteries in global electrochemical energy storage is as high as 86%. 22.9% of the world's total, and the annual consumption of lithium resources accounts for 40% of the world, so it has to be imported in large quantities from abroad; [0004] On the other hand, in the application field of large-scale energy storage, everyone is most concerned about the cost. The most prominent advantage of sodium-ion batteries compared with lithium-ion batteries is that they are cheap. [0005] In the field of sodium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M10/054
Inventor 韩建涛黄必成方淳
Owner HUAZHONG UNIV OF SCI & TECH
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