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A method for preparing spherical zinc cobaltate/carbon composite material using metal alkoxide as precursor

A carbon composite material, zinc cobalt oxide technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problem that the improvement of cycle and rate is not obvious enough, the composite of zinc cobalt oxide and carbon material is not enough, can not achieve Applicability and other issues, to achieve the effect of being suitable for large-scale industrial production, uniform appearance, and reducing difficulty

Active Publication Date: 2019-07-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the combination of zinc cobaltate and carbon materials obtained by this method is not sufficient enough, resulting in the improvement of cycle and rate in the application of lithium-ion batteries is not obvious enough, and still cannot reach the applicable level

Method used

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  • A method for preparing spherical zinc cobaltate/carbon composite material using metal alkoxide as precursor
  • A method for preparing spherical zinc cobaltate/carbon composite material using metal alkoxide as precursor
  • A method for preparing spherical zinc cobaltate/carbon composite material using metal alkoxide as precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Weigh 0.52 g (40 mmol / L) of cobalt nitrate and 0.26 g (20 mmol / L) of zinc nitrate and dissolve in 40 mL of isopropanol solvent, stir at room temperature to fully dissolve, and obtain a pink dispersion liquid;

[0033] Step 2: Add 5 mL of glycerol to the pink dispersion obtained in Step 1, stir and disperse evenly at room temperature to obtain a liquid to be reacted;

[0034] Step 3: Transfer the reaction solution obtained in Step 2 to a closed hydrothermal reaction kettle, put it in an oven, react at 180 °C for 8 hours, take it out and cool it to room temperature naturally, open the reaction kettle, collect it by centrifugation and wash it to obtain the precursor substance ;

[0035] Step 4: Dry the product obtained in Step 3 in an oven at 60 °C, and then pre-oxidize it at a set temperature of 250 °C and a heating rate of 2 °C / min for 4 h to obtain a pre-oxidized product;

[0036] Step 5: Carbonize the pre-oxidized product obtained in Step 4 at high temperatur...

Embodiment 2

[0039] Step 1: Weigh 0.26 g (20 mmol / L) cobalt nitrate and 0.13 g (10 mmol / L) zinc nitrate and dissolve them in 40 mL of isopropanol solvent, stir at room temperature to fully dissolve, and obtain a pink dispersion ;

[0040] Step 2: Add 5 mL of glycerol to the pink dispersion obtained in Step 1, stir and disperse evenly at room temperature to obtain a liquid to be reacted;

[0041] Step 3: Transfer the reaction solution obtained in Step 2 to a closed hydrothermal reaction kettle, put it in an oven, react at 180 °C for 8 hours, take it out and cool it to room temperature naturally, open the reaction kettle, collect it by centrifugation and wash it to obtain the precursor substance ;

[0042] Step 4: Dry the product obtained in Step 3 in an oven at 60 °C, and then pre-oxidize it at a set temperature of 250 °C and a heating rate of 2 °C / min for 4 h to obtain a pre-oxidized product;

[0043] Step 5: Carbonize the pre-oxidized product obtained in Step 4 at high temperature under t...

Embodiment 3

[0045] Step 1: Weigh 52 mg (2 mmol / L) of cobalt nitrate and 0.26 mg (1 mmol / L) of zinc nitrate and dissolve in 80 mL of isopropanol solvent, stir at room temperature to fully dissolve to obtain a pink dispersion ;

[0046] Step 2: Add 10 mL of glycerol to the pink dispersion liquid obtained in Step 1, stir and disperse evenly at room temperature to obtain the liquid to be reacted;

[0047] Step 3: Transfer the reaction solution obtained in Step 2 to a closed hydrothermal reaction kettle, put it in an oven, react at 180 °C for 8 hours, take it out and cool it to room temperature naturally, open the reaction kettle, collect it by centrifugation and wash it to obtain the precursor substance ;

[0048] Step 4: Put the product obtained in Step 3 into a 60°C oven for drying, and then pre-oxidize for 4 h at a set temperature of 250°C and a heating rate of 2°C / min to obtain a pre-oxidized product;

[0049] Step five: carbonize the pre-oxidized product obtained in step four under the...

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Abstract

The invention discloses a preparation method of a spherical zinc cobaltate / carbon composite material. The method comprises the following steps: dissolving cobalt nitrate and zinc nitrate in an isopropanol solvent, and stirring uniformly; adding glycerol, and uniformly stirring and mixing to obtain a reactant solution; transferring the reactant solution into a closed reaction kettle, carrying out thermostatic reaction, and carrying out centrifugation and washing to obtain the product the precursor metal alkoxide; drying the precursor, and carrying out preoxidation at a certain temperature; and carrying out high-temperature carbonization in an inert gas protective atmosphere, carrying out low-temperature oxidation at a certain temperature, and drying to obtain the spherical zinc cobaltate / carbon composite material. By using the metal alkoxide as the precursor, the obtained composite material can have uniform and controllable pattern. The oxide prepared by the method has excellent properties, and can be widely used in the fields of gas-sensitive detection, lithium ion batteries and the like.

Description

technical field [0001] The invention relates to a preparation method of a spherical metal oxide / carbon composite material, in particular to a preparation method of a spherical zinc cobaltate / carbon composite material with controllable particle size. Background technique [0002] Spinel-type cobalt tetroxide is a widely studied transition metal oxide. When a divalent cobalt is replaced by zinc, manganese, nickel, iron plasma, spinel cobaltate oxide is formed. This type of spinel-type transition metal oxide has the advantages of abundant resources, environmental friendliness, simple synthesis process, and low preparation cost. At the same time, its excellent performance in electrochemical capacitors, lithium-ion battery anode materials, semiconductor materials, catalysis, etc. makes it have great application prospects in key fields such as environmental pollution control and detection, and energy storage in the future. [0003] At present, the difficulty in the application of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/48H01M10/0525
CPCH01M4/362H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 朱俊武杨阳温丰孟晓茜钱惺悦胡入丹张健力宋凯
Owner NANJING UNIV OF SCI & TECH
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