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

A carbon composite material, nitrogen doping technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of battery capacity decay, electrode damage, uneven size of metal antimony particles, etc., to achieve high energy density, reduce Energy consumption and process cost, effect of good rate characteristics

Active Publication Date: 2020-04-10
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 application of nitrogen-doped antimony-carbon composite material in sodium-ion battery electrodes
  • Preparation method of nitrogen-doped antimony-carbon composite material and application of nitrogen-doped antimony-carbon composite material in sodium-ion battery electrodes
  • Preparation method of nitrogen-doped antimony-carbon composite material and application of nitrogen-doped antimony-carbon composite material in sodium-ion battery electrodes

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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 particularly relates to a preparation method of a nitrogen-doped antimony-carbon composite material and applicationof the nitrogen-doped antimony-carbon composite material in a sodium-ion battery electrode. Potassium antimony tartrate is used as an antimony source, dopamine hydrochloride is used as a nitrogen source and a carbon source, a precursor is obtained through a liquid-phase reaction at room temperature, and then the nitrogen-doped antimony-carbon composite material is obtained through centrifugation,washing, drying and carbonization treatment. In the reaction process, the hydrolysis speed of antimony in a solution can be effectively controlled by controlling the pH value of the reaction solution,and meanwhile dopamine is subjected to a slow polymerization reaction to form polydopamine which coats the surface of a hydrolysate. After the precursor obtained by adopting the method is subjected to carbonization treatment, the antimony-doped carbon composite material uniformly distributed inside can be formed, and the volume increase of the electrode material can be effectively relieved in thecharging and discharging process of the battery, so that the sodium ion battery keeps relatively high specific capacity. The method is simple and rapid, does not need complex equipment, is low in cost and is 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 Applications(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
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