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A preparation method of carbon nanosheet material and its application in sodium ion battery

A carbon nanosheet, carbon source technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor performance cycle stability, mismatched interlayer spacing, weak sodium storage ability, etc., to achieve good wettability and cheap raw materials. , the effect of moderate layer spacing

Active Publication Date: 2020-08-18
SHENZHEN RES INST CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, although graphite has a high lithium storage capacity, its ability to store sodium is very weak, which is generally believed to be caused by the mismatch between the radius of sodium ions and the spacing between graphite layers.
Amorphous carbon has a low degree of graphitization, and its structure is mainly composed of a large number of disordered carbon crystallites, with a large interlayer spacing and a large number of nanopores, which provide ideal active sites for the storage of sodium ions. , so amorphous carbon materials have high reversible sodium storage capacity, but such materials have poor conductivity, poor performance cycle stability, and fast capacity decay, which greatly limits their application in sodium-ion batteries.

Method used

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  • A preparation method of carbon nanosheet material and its application in sodium ion battery
  • A preparation method of carbon nanosheet material and its application in sodium ion battery
  • A preparation method of carbon nanosheet material and its application in sodium ion battery

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Embodiment 1

[0042] Dissolve 12.8g of phenolic resin in 50ml of absolute ethanol and stir until completely dissolved, add 2.23g of KCl and continue to stir until a suspension is formed, transfer the suspension to a polytetrafluoroethylene reactor for hydrothermal reaction, keep the temperature at 180°C, The holding time is 18h. After filtering, the product was washed three times with deionized water, and then dried in a vacuum oven at 60° C. for 10 h to obtain a two-dimensional carbon nanosheet precursor. Put 3.1 g of two-dimensional carbon nanosheet precursor in 50 mL of cobalt nitrate solution with a concentration of 2 mol / L, stir for 24 hours, and filter and dry to obtain a two-dimensional carbon nanosheet precursor that adsorbs transition metal ions. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 900 °C, the carbonization time was 2 h, and the heating rate was 2 °C / min. Subsequently, the high-temperature carbonized product was repeatedly wash...

Embodiment 2

[0045] Dissolve 13.1g of phenolic resin in 50ml of absolute ethanol and stir until it is completely dissolved, add 3.34g of KCl and continue to stir until a suspension is formed, transfer the suspension to a polytetrafluoroethylene reactor for hydrothermal reaction, keep the temperature at 180°C, The holding time is 16h. After filtration, wash with deionized water for 3 times, and then dry in a vacuum oven at 60° C. for 10 h to obtain a two-dimensional carbon nanosheet precursor. Put 3.1 g of the two-dimensional carbon nanosheet precursor in 50 mL of ferric chloride solution with a concentration of 1 mol / L, stir for 24 hours, and filter and dry to obtain the two-dimensional carbon nanosheet precursor adsorbing transition metal ions. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 1200°C, the carbonization time was 2h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washed three ti...

Embodiment 3

[0048] Dissolve 9.8g of phenolic resin in 50ml of absolute ethanol and stir until completely dissolved, add 3.3g of KCl and continue to stir until a suspension is formed, transfer the suspension to a polytetrafluoroethylene reactor for hydrothermal reaction, and keep the temperature at 180°C. The holding time is 16h. After filtration, wash with deionized water for 3 times, and then dry in a vacuum oven at 60° C. for 10 h to obtain a two-dimensional carbon nanosheet precursor. Put 3.1 g of two-dimensional carbon nanosheet precursor in 50 mL of cobalt nitrate solution with a concentration of 3 mol / L, stir for 24 hours, and filter and dry to obtain a two-dimensional carbon nanosheet precursor that adsorbs transition metal ions. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 900°C, the carbonization time was 2h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washed with a dilute nit...

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Abstract

The invention discloses a preparation method of a carbon nano-sheet material and an application of the carbon nano-sheet material in a sodium ion battery. The preparation method comprises mixing phenolic resin and KCl in anhydrous ethanol or dimethylformamide to obtain a suspension solution, carrying out hydrothermal treatment on the suspension solution, putting a product into an aqueous solutionof a transition metal salt, carrying out stirring to adsorb transition metal ions so that a precursor is obtained and carbonizing the precursor at 800-1200 DEG C. The preparation method utilizes easily available raw materials and has simple processes and good repeatability. The prepared material is unordered in a long range and ordered in a short range, has a large layer space, a rich channel structure, a large specific surface area and good electrical conductivity, can be used in a sodium ion battery, has high cycle efficiency, high specific capacity and rate performance and has a wide industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanosheet material and its application as a carbon negative electrode material of a sodium ion battery, belonging to the field of the sodium ion battery. Background technique [0002] With the gradual reduction of traditional energy sources such as coal, oil, and natural gas, and increasingly severe environmental problems, the demand for small separated mobile power supplies has shown an explosive growth trend, and various rechargeable chemical power supplies represented by lithium-ion batteries have received more and more attention. . Lithium consumption has also increased dramatically with the increase in demand for hybrid vehicles and electrical energy storage devices. However, due to the relatively small elemental content of lithium in the earth's crust, lithium extraction and recovery are difficult. Therefore, sodium-ion batteries with a similar deintercalation mechanism to lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/133
CPCH01M4/133H01M4/583Y02E60/10
Inventor 张治安尹盟陈玉祥赖延清张凯
Owner SHENZHEN RES INST CENT SOUTH UNIV
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