Coal-based graphite microcrystal conductive compound and preparation method and application thereof

A technology of graphite microcrystals and composites, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems that restrict the wide application of coal-based carbon materials, the conductivity of coal-based carbon materials is not high, and the unfavorable full infiltration of electrolyte, etc. Achieve excellent rate and cycle performance, low price, and improve conductivity

Inactive Publication Date: 2019-06-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this carbon electrode precursor requires high carbon content in coal, which may not be suitable for some low-rank coals; and the prepared carbon material has a large particle size, which is not conducive to sufficient infiltration of the electrolyte and affects electrochemical performance; in addition The conductivity of coal-based carbon materials is not high and needs to be improved
These problems restrict the wide application of coal-based carbon materials as conductive materials.

Method used

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  • Coal-based graphite microcrystal conductive compound and preparation method and application thereof
  • Coal-based graphite microcrystal conductive compound and preparation method and application thereof
  • Coal-based graphite microcrystal conductive compound and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The bituminous coal was pulverized to obtain precursor particles with a particle size of 200 mesh. Under an ice-water bath, 5 g of bituminous coal particles were slowly stirred and added to 100 mL of mixed acid (VHNO 3 :VH 2 SO 4 =1:4) in the beaker. Raise the temperature to 80 °C and stir the reaction for 8 h, then cool to room temperature and dilute with water. The mixture was centrifuged at 3000 rpm for 3 min to collect oxidized coal samples. Then place it in a dialysis bag for dialysis treatment and wash until neutral. Then the sample was centrifuged at 10,000 rpm for 5 min, the suspension was selected, and dried at 60 °C for 48 h to obtain a graphite oxide microcrystalline sample. According to the mass ratio of 1:2, the graphene oxide and the prepared graphite oxide microcrystal samples were ultrasonically mixed at room temperature for 60 min to prepare a uniform mixed solution. The mixed solution was vacuum freeze-dried for 36 h to obtain a composite gel of g...

Embodiment 2

[0033] The anthracite was pulverized to obtain 100-mesh precursor particles. Under an ice-water bath, 5 g of anthracite particles were slowly stirred and added to 100 mL of mixed acid (VHNO 3 :VH 2 SO 4=1: 5) in the beaker. Raise the temperature to 70 °C and stir the reaction for 10 h, then cool to room temperature and dilute with water. The mixture was centrifuged at 4000 rpm for 5 min to collect oxidized coal samples. Then place it in a dialysis bag for dialysis treatment and wash until neutral. Then the sample was centrifuged at 11000 rpm for 5 min, the suspension was selected, and dried at 80 °C for 36 h to obtain a graphite oxide microcrystalline sample. According to the mass ratio of 1:2, the carboxylated carbon nanotubes and the prepared graphite oxide microcrystal samples were ultrasonically mixed at room temperature for 120 min to prepare a mixed solution. The mixed solution was vacuum freeze-dried for 36 h to obtain a composite gel of graphite oxide microcrystal...

Embodiment 3

[0037] The coking coal was pulverized to obtain precursor particles with a mesh size of 400 mesh. Under an ice-water bath, 7 g of coking coal particles were slowly stirred and added to 100 mL of mixed acid (VHNO 3 :VH 2 SO 4 =1:3) in the beaker. Raise the temperature to 80 °C and stir the reaction for 10 h, then cool to room temperature and dilute with water. The mixture was centrifuged at 3000 rpm for 5 min to collect oxidized coal samples. Then place it in a dialysis bag for dialysis treatment and wash until neutral. Then the sample was centrifuged at 10,000 rpm for 9 min, the suspension was selected, and dried at 80 °C for 24 h to obtain a graphite oxide microcrystalline sample. According to the mass ratio of 1:2, the water-soluble carbon black and the prepared graphite oxide crystallites were ultrasonically mixed at room temperature for 30 min to prepare a mixed solution. The mixed solution was vacuum freeze-dried for 24 h to obtain a composite gel of graphite oxide m...

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Abstract

The invention relates to a preparation method and application of a sodium-ion battery cathode material, namely a coal-based graphite microcrystal conductive compound. According to the preparation method, first, graphite oxide microcrystals are prepared from a coal-based material; second, the prepared graphite oxide microcrystals and a conductive carbon material are made into a uniformly-mixed mixed solution; third, the mixed solution is made into graphite oxide microcrystal / conductive carbon material composite gel; and last, the graphite oxide microcrystal / conductive carbon material compositegel is calcined in an inert atmosphere, so that the coal-based graphite microcrystal conductive compound is obtained. The graphite microcrystal compound prepared through the method has excellent conductivity; and when the compound is used as the sodium-ion battery cathode material, the compound shows excellent rate capability and circulation performance through electrochemical performance assessment.

Description

technical field [0001] The invention belongs to the technical field of nano-carbon material preparation, in particular, it relates to a coal-based graphite microcrystalline conductive composite which can be used as a negative electrode material of a sodium ion battery, and a preparation method and application thereof. Background technique [0002] In recent years, with the explosive development of the new energy automobile industry, the production capacity of lithium-ion batteries has increased sharply, and the demand for lithium sources is increasing. However, the crustal abundance of lithium is only 0.0065%, and the global distribution is uneven, 75% is mainly in the Americas, which is expensive. Then, in order to meet the supply of lithium-ion battery production capacity in the future, there will be a large gap in lithium sources. Therefore, it is urgent to develop a next-generation energy storage battery system with excellent comprehensive performance. Compared with li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/054
CPCY02E60/10
Inventor 赵翰庆康孟孟李忠申汉庭
Owner TAIYUAN UNIV OF TECH
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