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A preparation method of nickel-cobalt-manganese hydroxide nanoneedle/nitrogen-doped carbon/nickel foam electrode material

A technology of hydroxide and nitrogen-doped carbon, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors. It can solve the problems of material agglomeration, unstable structure, high specific energy and high cost performance, and achieve safe operation. Reliable, does not involve hazardous chemicals, the effect of a wide range of raw material sources

Active Publication Date: 2021-12-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the same shape and size, the higher the loading amount, the higher the specific energy and cost performance; the increase of the single loading amount often causes changes in the shape and size of the material, resulting in material agglomeration, reduced activity, and volume changes that cannot be buffered. problems such as structural instability
Most of the active substance loads reported in current research are 0.5-5mg / cm 2 between, far from meeting the requirements of industrial production for high specific energy and low cost

Method used

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  • A preparation method of nickel-cobalt-manganese hydroxide nanoneedle/nitrogen-doped carbon/nickel foam electrode material
  • A preparation method of nickel-cobalt-manganese hydroxide nanoneedle/nitrogen-doped carbon/nickel foam electrode material
  • A preparation method of nickel-cobalt-manganese hydroxide nanoneedle/nitrogen-doped carbon/nickel foam electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) The nickel foam with a size of 2cm×4cm was ultrasonically cleaned with acetone, 3M HCl, deionized water, and absolute ethanol for 10 min, respectively, and dried at 45°C.

[0045] (2) Weigh nickel acetate (concentration 45mM), citric acid and urea are dissolved in 250ml ethanol and stir to make it dissolve completely, wherein the mass ratio of nickel acetate, citric acid and urea is 1:2:5;

[0046] (3) Place the nickel foam treated in step (1) in the mixed solution of 250mL step (2), and heat to 80°C until the crystals in the solution are completely precipitated;

[0047] (4) Calcining the nickel foam treated in step (3) in argon at 350° C. for 2 h, and then at 650° C. for 2 h, with a heating rate of 5° C. / min.

[0048] (5) Weigh 2mmol of nickel nitrate, 2mmol of cobalt nitrate, 2mmol of manganese nitrate and 2.5mmol of urea and dissolve them in 30mL of deionized water, stir evenly to dissolve them completely;

[0049](6) Place the nickel foam obtained in step (4) ...

Embodiment 2

[0053] (1) The nickel foam with a size of 2cm×4cm was ultrasonically cleaned with acetone, 2M HCl, deionized water, and absolute ethanol for 15 minutes, and dried at 60°C.

[0054] (2) Weigh nickel chloride (concentration 30mM), citric acid and urea and dissolve them in 100ml of ethylene glycol and stir to dissolve them completely, wherein the mass ratio of nickel chloride, citric acid and urea is 1:2:7;

[0055] (3) the nickel foam after step (1) treatment is placed in the mixed solution of 100ml step (2) and is heated to 60 ℃ until the crystal in the solution is completely separated out;

[0056] (4) Calcining the nickel foam treated in step (3) at 350° C. for 8 hours in argon with a heating rate of 8° C. / min.

[0057] (5) Take by weighing 1mmol nickel chloride, 1mmol cobalt chloride, 1mmol manganese chloride and 1.5mmol urea and dissolve them in 30ml deionized water, stir to make them completely dissolve;

[0058] (6) Place the nickel foam obtained in step (4) in the mixed...

Embodiment 3

[0062] (1) Nickel foam with a size of 2cm×4cm was ultrasonically cleaned with acetone, 1M HCl, deionized water, and absolute ethanol for 20 minutes, and dried at 70°C.

[0063] (2) Take nickel nitrate (concentration 40mM), citric acid and urea and dissolve it in 200ml glycerol and stir to make it dissolve completely, wherein the mass ratio of nickel nitrate, citric acid and urea is 1:2:10;

[0064] (3) 200ml of nickel foam treated in step (1) is placed in the mixed solution of step (2) and heated to 40°C until the crystals in the solution are completely separated out;

[0065] (4) Calcining the nickel foam treated in step (3) at 650° C. for 2 hours in argon with a heating rate of 20° C. / min.

[0066] (5) Take by weighing 0.1mmol nickel nitrate, 0.1mmol cobalt nitrate, 0.1mmol manganese nitrate and 0.5mmol urea and dissolve them in 30ml deionized water, stir evenly to make them dissolve completely;

[0067] (6) Place the nickel foam obtained in step (4) in the mixed solution o...

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Abstract

A preparation method of nickel-cobalt-manganese hydroxide nanoneedle / nitrogen-doped carbon / nickel foam electrode material is implemented as follows: (1) cleaning and drying the nickel foam substrate; (2) taking nickel metal salt, citric acid , urea dissolved in an alcohol solvent to obtain a mixed solution A; (3) place the processed nickel foam in the mixed solution A and heat it to 40-80°C in the air for processing until the crystals in the solution are completely separated out; (4) process the The final foamed nickel is roasted in argon; (5) get nickel metal salt, cobalt metal salt, manganese metal salt and urea and dissolve in deionized water to obtain mixed solution B; (6) place the foamed nickel obtained in mixed solution B (7) cooling, washing and drying to obtain the electrode material. The invention greatly improves the specific surface area of ​​the nickel foam, and ensures the shape and size of the active material while increasing the loading capacity, thereby realizing high area specific capacity and cycle stability.

Description

technical field [0001] The invention relates to a preparation method of a nickel-cobalt-manganese hydroxide nano-needle / nitrogen-doped carbon / foam nickel electrode material. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the characteristics of large discharge power, light and fast use, no pollution to the environment, long cycle life, high stability, wide operating temperature range, and high safety performance, and has attracted more and more attention. . Electrode materials have a great influence on the performance and development of supercapacitors, and the optimization and regulation of their morphology, composition, and size is the main research direction of current electrode materials. The area specific capacitance is an important evaluation parameter, and the morphology, size and loading of the active material directly affect the area specific capacity. Under the same shape and size, the higher the loading amount, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/46H01G11/86
CPCH01G11/46H01G11/30H01G11/24H01G11/32H01G11/86
Inventor 王连邦占静刘林辉苏利伟吴昊林威
Owner ZHEJIANG UNIV OF TECH
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