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Hard carbon material, preparation method thereof, and sodium ion battery

A hard carbon, hard sheet technology, applied in battery electrodes, secondary batteries, circuits, etc.

Active Publication Date: 2021-02-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon material prepared by using coal as raw material in the above scheme has the highest sodium storage specific capacity of only 271.4mAh g -1

Method used

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  • Hard carbon material, preparation method thereof, and sodium ion battery
  • Hard carbon material, preparation method thereof, and sodium ion battery
  • Hard carbon material, preparation method thereof, and sodium ion battery

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preparation example Construction

[0034] The invention provides a kind of preparation method of hard carbon material, comprises the following steps:

[0035] (1) After mixing the coal-based material and the hard carbon precursor, press it to obtain a hard sheet;

[0036] The hard carbon precursor is carbohydrate and / or gelatin;

[0037] (2) Carrying out high-temperature carbonization of the hard sheet obtained in the step (1) to obtain a hard carbon material.

[0038] In the invention, the coal-based material and the hard carbon precursor are mixed and pressed to obtain a hard sheet.

[0039] In the present invention, the coal-based material preferably includes at least one of anthracite, bituminous coal and lignite, more preferably bituminous coal and / or lignite. In the present invention, the bituminous coal and / or lignite are cheaper among coal-based materials, and are used as raw materials for preparing hard carbon materials.

[0040] In the present invention, the hard carbon precursor is carbohydrate an...

Embodiment 1

[0064] After mixing 14g lignite with 6g sucrose (the mass ratio of coal-based material and hard carbon precursor is 7:3), put it into a ball mill and mill it with the number of revolutions of 400r / min, and ball mill for 4h (at this time, the particle size of lignite and sucrose is equal to in the range of 1 to 10 μm); take out the powder, pour it into the mold of the tablet press, and keep it under a pressure of 15MPa for 5 minutes to obtain a hard tablet, which is taken out. The digital photo of the hard tablet is as follows: figure 1 As shown in Figure 1, it can be seen that the hard tablet obtained after being pressed by the step-down tablet machine is round, with a relatively smooth surface and no defects.

[0065] The hard sheet is placed in a tube furnace for high-temperature carbonization in a nitrogen atmosphere, first raised to 400°C at a rate of 2°C / min, and kept for 2 hours; then raised to 1200°C at a rate of 5°C / min, Insulate for 2 hours, and finally cool down to r...

Embodiment 2

[0088] After mixing 5g of bituminous coal and 5g of glucose, put it into a ball mill and mill at a speed of 400r / min for 3 hours (at this time, the particle sizes of bituminous coal and glucose are both in the range of 1-10μm); take out the powder and pour it into the mold of the tablet press In 20MPa pressure for 10min, a hard sheet was obtained, and the hard sheet was placed in a tube furnace for high-temperature carbonization in a nitrogen atmosphere, first raised to 500°C at a rate of 3°C / min, and kept for 0.5h. Then, the temperature was raised to 800°C at a heating rate of 4°C / min, kept for 2 hours, and finally cooled down to room temperature naturally. After the product was boiled in 3M hydrochloric acid for 4 hours, it was washed with deionized water for 4 hours until the pH was 7, and the final hard carbon material was obtained. (The mass ratio of coal-based material to hard carbon precursor is 1:1)

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Abstract

The invention relates to the technical field of sodium ion batteries, and provides a preparation method of a hard carbon material. The preparation method comprises the following steps: mixing a coal-based material and a hard carbon precursor, and pressing to obtain a hard sheet, wherein the hard carbon precursor is carbohydrate and / or gelatin; and carrying out high-temperature carbonization on theobtained hard sheet to obtain the hard carbon material. According to the invention, the hard carbon precursor and the coal-based material are in close contact through a tabletting means, so that thereaction activity of the hard carbon precursor and the coal-based material is greatly improved, the hard carbon precursor and the coal-based material are fully subjected to a cross-linking reaction ina high-temperature carbonization treatment process, the carbonization yield is effectively improved, meanwhile, defects formed in the carbonization process are reduced, the specific surface area is reduced, and the disorder of the carbon layers and the spacing between the carbon layers in the carbonization process are increased. A sodium ion battery obtained by taking the hard carbon material obtained by the preparation method as a negative electrode material of the sodium ion battery has high sodium storage capacity and first coulombic efficiency.

Description

technical field [0001] The invention relates to the technical field of sodium ion battery materials, in particular to a hard carbon material, a preparation method thereof and a sodium ion battery. Background technique [0002] Na-ion batteries are expected to be used in the next generation of large-scale energy storage devices due to their abundant resources, high energy conversion efficiency, and good safety. Anode materials are one of the main issues restricting the development of sodium-ion batteries. Due to its low degree of graphitization, high degree of disorder, large carbon interlayer spacing, and high specific capacity when applied to the anode of sodium-ion batteries, amorphous carbon materials have attracted extensive attention from researchers. [0003] Amorphous carbon materials can be divided into hard carbon materials and soft carbon materials. Among them, hard carbon materials have a small degree of graphitization and poor rate performance, while soft carbon...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/054
CPCH01M4/587H01M10/054H01M2004/027Y02E60/10
Inventor 徐斌陈赫孙宁
Owner BEIJING UNIV OF CHEM TECH
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