Preparation method of modified sodium alginate-derived carbon negative electrode material with high sodium storage property

A carbon negative electrode material, sodium alginate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of low sodium storage capacity and achieve high sodium storage capacity

Inactive Publication Date: 2018-01-09
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for preparing a modified sodium alginate-derived carbon negative electrode material with excellent sodium storage performance, so as to overcome the above-mentioned existing sodium alginate-derived carbon needs After experiencing the high energy-consuming production process of freeze-drying and the problem of low sodium storage capacity, it is expected to have a good application prospect

Method used

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  • Preparation method of modified sodium alginate-derived carbon negative electrode material with high sodium storage property
  • Preparation method of modified sodium alginate-derived carbon negative electrode material with high sodium storage property

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Embodiment 1

[0025] Put the commercial sodium alginate solid powder into the tube furnace, pass N 2 Protection, and then starting from room temperature, the temperature was raised at a rate of 5°C / min, the temperature was raised to 700°C, and the temperature was kept constant for 2h. Cool to room temperature after carbonization. The above-mentioned intermediate product was soaked in nitric acid with a concentration of 2 mol / L for 12 hours to remove small inorganic molecular compounds produced during the carbon removal process. Then, the above mixed solution was poured into a hydrothermal reaction kettle, and the temperature was raised from room temperature at a rate of 2°C / min to 90°C for hydrothermal oxidation for 3 hours. After filtering, washing with water until neutral, washing with alcohol, and vacuum drying at 50°C for 24 hours, the final product—modified sodium alginate-derived carbon can be obtained.

Embodiment 2

[0027] Put the commercial sodium alginate solid powder into the tube furnace, pass N 2 Protection, and then start from room temperature, raise the temperature at a rate of 5°C / min, raise the temperature to 600°C, and keep the temperature constant for 2h. Cool to room temperature after carbonization. The above-mentioned intermediate product was soaked in nitric acid with a concentration of 2 mol / L for 12 hours to remove small inorganic molecular compounds produced during the carbon removal process. Then, the above mixed solution was poured into a hydrothermal reaction kettle, and the temperature was raised from room temperature at a rate of 2°C / min to 90°C for hydrothermal oxidation for 3 hours. After filtering, washing with water until neutral, washing with alcohol, and vacuum drying at 50°C for 24 hours, the final product—modified sodium alginate-derived carbon can be obtained.

Embodiment 3

[0029] Put the commercial sodium alginate solid powder into the tube furnace, pass N 2 protection, and then start from room temperature, raise the temperature at a rate of 5°C / min, raise the temperature to 800°C, and keep the temperature constant for 2h. Cool to room temperature after carbonization. The above-mentioned intermediate product was soaked in nitric acid with a concentration of 2 mol / L for 12 hours to remove small inorganic molecular compounds produced during the carbon removal process. Then, the above mixed solution was poured into a hydrothermal reaction kettle, and the temperature was raised from room temperature at a rate of 2°C / min to 90°C for hydrothermal oxidation for 3 hours. After filtering, washing with water until neutral, washing with alcohol, and vacuum drying at 50°C for 24 hours, the final product—modified sodium alginate-derived carbon can be obtained.

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Abstract

The invention discloses a preparation method of a modified sodium alginate-derived carbon negative electrode material with high sodium storage property. The method comprises the steps of firstly, directly putting sodium alginate into an inert atmosphere for high-temperature carbonization to obtain sodium alginate-derived carbon, soaking the sodium alginate-derived carbon component into strong oxidizing acids (such as a nitric acid, a sulfuric acid or a mixed acid of the nitric acid and the sulfuric acid) for a certain period of time to remove an inorganic small molecule compound; secondly, pouring the mixed solution into a hydrothermal reactor for hydrothermal oxidation to prepare modified sodium alginate-derived carbon; and finally filtering, washing the modified sodium alginate-derived carbon to neutral, carrying out alcohol-washing and drying in sequence to obtain a final product. The prepared oxidatively modified sodium alginate-derived carbon material is taken as the negative electrode material of a sodium-ion battery, and is simple in preparation process and low in cost; a pseudocapacitance sodium storage active site can be introduced; and the sodium storage capacity of the electrode material is improved, so that the problem of relatively low sodium storage capacity of an existing carbon-based negative electrode material is overcome and the preparation method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a preparation method of a modified sodium alginate-derived carbon negative electrode material with high sodium storage performance. Background technique [0002] The energy crisis and environmental problems caused by over-exploitation and utilization of petrochemical energy are one of the most severe challenges facing mankind in the future. Therefore, the task of developing more efficient energy storage and conversion equipment and reducing the use of petrochemical energy to a greater extent is imminent. Lithium-ion batteries are the most widely used electrochemical energy storage devices due to their high energy density, environmental friendliness and long cycle life, and have occupied the power supply market for portable electronic devices. However, the relatively scarce content of lithium resources in the earth's crust and its high cost urgently require us to find alternat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCY02E60/10
Inventor 黄华波夏志钰熊凯李亮姚军龙陈静程航张伟
Owner WUHAN INSTITUTE OF TECHNOLOGY
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