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Hard carbon negative electrode material and preparation method and application thereof

A negative electrode material, hard carbon technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of irreversible deintercalation, no sodium storage capacity, etc., to achieve excellent cycle stability and enhance the effect of sodium storage capacity

Pending Publication Date: 2022-05-13
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic radius of sodium ions (r=0.113nm) is at least 35% larger than that of lithium ions (r=0.076), which makes sodium ions relatively stable in the rigid lattice and difficult to reversibly deintercalate in the regular graphite structure, almost no sodium storage capacity

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A method for preparing the above-mentioned hard carbon negative electrode material, comprising the following steps:

[0057] (1) 50g of PEG-4000 (polyethylene glycol 4000) was dissolved in 1000ml of deionized water to prepare a 5% PEG-4000 polymer organic pore-forming solution;

[0058] (2) Under the protection of nitrogen, put cornstarch in a sintering furnace, raise the temperature to 220°C at a heating rate of 1°C / min for 30 hours of cross-linking treatment, and cool to 50°C to obtain a sintered product;

[0059] (3) Take 100ml of the 5% PEG-4000 polymer organic pore-forming solution in step (1) and 100g of the monocalcined product in step (2), and mix them uniformly to obtain the precursor;

[0060] (4) Place the precursor obtained in step (3) in a sintering furnace, raise the temperature to 400° C. at a heating rate of 3° C. / min under a nitrogen atmosphere, and perform aromatic cyclization treatment for 3 hours;

[0061] (5) Place the sample after step (4) aromati...

Embodiment 2

[0063] A method for preparing the above-mentioned hard carbon negative electrode material, comprising the following steps:

[0064] (1) 50g of PEG-4000 was dissolved in 1000ml of deionized water to prepare a 5% PEG-4000 polymer organic pore-forming solution;

[0065] (2) Under the protection of nitrogen, put cornstarch in a sintering furnace, raise the temperature to 220°C at a heating rate of 1°C / min for 30 hours of cross-linking treatment, and cool to 50°C to obtain a sintered product;

[0066] (3) Take 100ml of the 5% PEG-4000 polymer organic pore-forming solution in step (1) and 100g of the monocalcined product in step (2), and mix them uniformly to obtain the precursor;

[0067] (4) Place the precursor obtained in step (3) in a sintering furnace, raise the temperature to 300° C. at a heating rate of 3° C. / min under a nitrogen atmosphere, and perform aromatic annulation treatment for 3 hours;

[0068] (5) Place the sample after step (4) aromatic cyclization pore-forming i...

Embodiment 3

[0070] A method for preparing the above-mentioned hard carbon negative electrode material, comprising the following steps:

[0071] (1) 50g of PEG-4000 was dissolved in 1000ml of deionized water to prepare a 5% PEG-4000 polymer organic pore-forming solution;

[0072] (2) Under the protection of nitrogen, put cornstarch in a sintering furnace, raise the temperature to 220°C at a heating rate of 1°C / min for 30 hours of cross-linking treatment, and cool to 50°C to obtain a sintered product;

[0073] (3) Take 100ml of the 5% PEG-4000 polymer organic pore-forming solution in step (1) and 100g of the monocalcined product in step (2), and mix them uniformly to obtain the precursor;

[0074] (4) Place the precursor obtained in step (3) in a sintering furnace, raise the temperature to 500° C. at a heating rate of 3° C. / min under a nitrogen atmosphere, and perform aromatic annulation treatment for 3 hours;

[0075] (5) Place the sample after step (4) aromatic cyclization pore-forming i...

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Abstract

The invention discloses a hard carbon negative electrode material and a preparation method and application thereof. The substrate of the hard carbon negative electrode material is prepared by taking starch as a raw material; the diameter of an internal pore of the hard carbon negative electrode material is greater than that of a surface pore. The reasonable pore diameter and the large interlayer spacing of the hard carbon negative electrode material are beneficial to intercalation / deintercalation of sodium ions.

Description

technical field [0001] The invention belongs to the technical field of battery negative electrode materials, and in particular relates to a hard carbon negative electrode material and a preparation method and application thereof. Background technique [0002] With the decrease of traditional fossil energy and the increase of environmental pollution, the development and utilization of energy is particularly important. Lithium-ion batteries have become the main energy storage devices in the field of consumer electronics due to their advantages such as high energy density, high voltage, low self-discharge and excellent cycle performance. However, the lack of lithium resources on the earth, coupled with the wide application of lithium-ion batteries, makes lithium resources more scarce and the price remains high, which is not suitable for large-scale energy storage applications. Therefore, it is urgent to develop the next generation of energy storage with excellent comprehensive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/054
CPCH01M4/587H01M10/054Y02E60/10C01B32/05C01P2004/61C01P2006/16H01M2004/027H01M2004/021H01M4/133H01M10/54
Inventor 郑爽李长东阮丁山蔡勇毛林林张振华
Owner GUANGDONG BRUNP RECYCLING TECH
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