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Preparation method of vanadium nitride

A technology of vanadium nitride and vanadium oxide, which is applied in the field of preparation of supercapacitor electrode materials, can solve the problems of low specific capacitance of carbon materials, scarcity of resources, hidden safety hazards, etc., achieve high specific capacitance, avoid re-agglomeration, and use less materials Effect

Inactive Publication Date: 2011-05-25
庄晓曦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are certain safety hazards in the use of such supercapacitors, and the specific capacitance of carbon materials is relatively low
RuO 2 ﹒ nH 2 O has good electrical conductivity and high specific capacitance at the same time, and is an excellent supercapacitor material, but it is difficult to commercialize due to its scarcity and high price.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 1.3g of vanadium oxide and 50ml of ethylenediamine in the reaction kettle, heat to 150°C for 3h, cool to room temperature, filter after the chelate crystallizes, and load the obtained chelate crystals with a porcelain ark. The calcination is carried out in a tubular furnace with nitrogen protection and programmed temperature control, at a heating rate of 5°C / min to 600°C, holding for 2 hours, and cooling to room temperature to obtain the target product.

[0018] Most of the above-mentioned target products have a particle size of <50 nm and good conductivity. They are used as active materials for supercapacitor electrodes to make working electrodes, and simulated supercapacitor units are assembled for cyclic voltammetry and constant current charge and discharge tests. When charging and discharging at a high current density of g, its specific capacity is 88.4% of that when the current density is 1.5A / g. After 2000 cycles at a sweep rate of 35 mV / s, its capacity is only a...

Embodiment 2

[0020] Take 1.3g of vanadium oxide and 100ml of hydrazine in a reaction kettle, heat to 130°C for 2h, cool to room temperature, filter after the chelate crystallizes, and load the obtained chelate crystals with a porcelain ark. The calcination is carried out in a tube furnace with a gas protection and programmed temperature control device, the temperature rise rate is 5°C / min to 500°C, the temperature is kept for 2 hours, and the target product is obtained after cooling to room temperature.

[0021] Most of the above-mentioned target products have a particle size of <30 nm and good conductivity. They are used as active materials for supercapacitor electrodes to make working electrodes, and simulated supercapacitor units are assembled for cyclic voltammetry and constant current charge and discharge tests. When charging and discharging at a high current density of g, its specific capacity is 88.4% of that when the current density is 1.5A / g. After 2000 cycles at a sweep rate of 35 mV...

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Abstract

The invention provides a preparation method of vanadium nitride, which comprises the steps of: mixing vanadium oxide with an organic nitrogen compound, carrying out heat treatment with a solvent to obtain vanadium-nitrogen chelate, crystallizing, filtering and then calcining in a protective gas to obtain the vanadium nitride. The vanadium nitride prepared according to the method provided by the invention has small grain diameter, high specific capacitance and excellent cycle performance. The preparation method of vanadium nitride, provided by the invention, has mild reaction conditions and low reaction temperature as well as effectively prevents agglomeration of vanadium nitride nano particles; and after crystallization and filtration, the excessive oxygen-free organic nitrogen compounds can be recovered and used repeatedly, thereby saving energy and lowering production cost.

Description

technical field [0001] The invention relates to the field of preparation of supercapacitor electrode materials, in particular to a preparation method of vanadium nitride. Background technique [0002] As a new type of energy storage device, supercapacitors have broad application prospects in portable power-consuming electronic products and electric vehicles. At present, the supercapacitors that have been commercialized are usually non-aqueous electrolytes, and carbon materials are used as electrode materials. There are certain safety hazards in the use of such supercapacitors, and the specific capacitance of carbon materials is relatively low. RuO 2 ﹒ nH 2 O has good electrical conductivity and high specific capacitance at the same time, and is an excellent material for supercapacitors, but it is difficult to commercialize due to its scarcity and high price. [0003] Vanadium nitride (VN) has very high thermal and chemical stability and strong mechanical properties. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06
Inventor 庄晓曦
Owner 庄晓曦
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