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Preparation method of nitrogen-doped antimony-carbon composite material and its application in sodium-ion battery electrodes

A sodium-ion battery and composite material technology, applied in the field of electrode material preparation, can solve the problems of battery capacity attenuation, electrode damage, uneven metal antimony particle size, etc., achieve high energy density, reduce energy consumption and process costs, and good rate The effect of the characteristic

Active Publication Date: 2022-05-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above reports, the solution of antimony chloride is generally used as the precursor, and antimony chloride is easy to agglomerate into larger particles during the spray drying process, resulting in uneven particle size of metal antimony in the prepared antimony-carbon composite material. Electrode damage and battery capacity attenuation are prone to occur during discharge

Method used

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  • Preparation method of nitrogen-doped antimony-carbon composite material and its application in sodium-ion battery electrodes
  • Preparation method of nitrogen-doped antimony-carbon composite material and its application in sodium-ion battery electrodes
  • Preparation method of nitrogen-doped antimony-carbon composite material and its application in sodium-ion battery electrodes

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Effect test

Embodiment 1

[0027] A preparation method of nitrogen-doped antimony-carbon composite material, comprising the following steps:

[0028] (1) Prepare an aqueous solution of potassium antimony tartrate with a concentration of 0.02mol / L;

[0029] (2) Weigh an appropriate amount of dopamine hydrochloride and dissolve it in the potassium antimony tartrate solution, stir to dissolve it fully, in which the concentration of dopamine hydrochloride is 0.01mol / L; the mass ratio of potassium antimony tartrate to dopamine hydrochloride is 2:1, drop Enter ammonia water to adjust the pH of the solution to be 8, and stir for 12 hours;

[0030] (3) Centrifuge the sediment in the lower layer, wash it with deionized water and absolute ethanol for 2 to 3 times, and then dry it in a blast drying oven at a temperature of 70°C;

[0031] (4) The product obtained in step (3) was carbonized using a tube furnace, the carbonization temperature was 500°C, the heating time was 2° / min, the holding time was 2 hours, and ...

Embodiment 2

[0034] A preparation method of nitrogen-doped antimony-carbon composite material, comprising the following steps:

[0035] (1) Prepare a mixed solution of sodium antimony tartrate water and ethanol, in which the volume ratio of water and ethanol is 8:2, and the concentration of sodium antimony tartrate is 0.02mol / L;

[0036] (2) Weigh an appropriate amount of dopamine hydrochloride and dissolve it in sodium antimony tartrate solution, stir to dissolve it fully, wherein the concentration of dopamine hydrochloride is 0.01mol / L; wherein the mass ratio of sodium antimony tartrate to dopamine hydrochloride is 2:1, Add sodium hydroxide solution dropwise to adjust the pH of the solution to 8, and stir at 40°C for 10 hours;

[0037] (3) Centrifuge the solution obtained in step (2), wash it with deionized water and absolute ethanol for 2 to 3 times, and then dry it in a blast drying oven at a temperature of 70°C;

[0038] (4) The product obtained in step (3) was carbonized using a tub...

Embodiment 3

[0041] A preparation method of nitrogen-doped antimony-carbon composite material, comprising the following steps:

[0042] (1) Prepare an aqueous solution of antimony potassium tartrate with a concentration of 0.2mol / L;

[0043] (2) Weigh an appropriate amount of dopamine hydrochloride and dissolve it in the potassium antimony tartrate solution, stir to dissolve it fully, wherein the concentration of dopamine hydrochloride is 0.1mol / L; the mass ratio of potassium antimony tartrate to dopamine hydrochloride is 2:1, Potassium hydroxide was added dropwise to adjust the pH of the solution to be 8, and stirred for 12 hours;

[0044] (3) Centrifuge the solution obtained in step (2), wash with deionized water and absolute ethanol for 2 to 3 times, and then freeze-dry at -55°C for 24 hours;

[0045] (4) The product obtained in step (3) was carbonized using a tube furnace, the carbonization temperature was 500°C, the heating time was 2° / min, the holding time was 2 hours, and the prote...

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Abstract

The invention belongs to the technical field of electrode material preparation, and in particular relates to a preparation method of a nitrogen-doped antimony-carbon composite material and its application to sodium ion battery electrodes. The present invention uses antimony potassium tartrate as an antimony source, dopamine hydrochloride as a nitrogen source and a carbon source, obtains a precursor through a liquid phase reaction at room temperature, and then undergoes centrifugation, washing, drying, and carbonization to obtain a nitrogen-doped antimony-carbon composite material . During the reaction process, the hydrolysis rate of antimony in the solution can be effectively controlled by controlling the pH value of the reaction solution. At the same time, dopamine undergoes a slow polymerization reaction to form polydopamine, which is coated on the surface of the hydrolyzed product. After the precursor obtained by this method is carbonized, a doped antimony-carbon composite material uniformly distributed inside can be formed, which can effectively alleviate the increase in the volume of the electrode material during the charging and discharging process of the battery, so that the sodium-ion battery can maintain a high specificity. capacity. The method is simple and fast, does not require complex equipment, and is low in cost, suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a preparation method of a nitrogen-doped antimony-carbon composite material and its application to sodium-ion battery electrodes. Background technique [0002] With the rapid development of 3C electronic products, electric vehicles and large-scale energy storage power stations, lithium-ion batteries, especially power batteries, as the main energy storage products are also developing rapidly. Among them, power batteries will soon become the largest driving engine in the next few years. However, currently commercial lithium-ion batteries generally use graphite or hard carbon as the anode. Due to the limited theoretical specific capacity (372 mAh / g) and flammable characteristics of carbon materials, the further improvement of the energy density and safety of lithium-ion batteries is limited, and it is difficult to meet the requirements of current a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/054C01B32/15
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M4/134H01M10/054C01B32/15H01M2004/021H01M2004/027Y02E60/10
Inventor 孙连山王春丽程勇梁飞王立民邱静霞杨石榴徐丽李华明
Owner JIANGSU UNIV