Vulcanized modification method for Ni-Fe LDH electrode material

An electrode material and modification technology, applied in the field of vulcanization modification of Ni-FeLDH electrode materials, can solve the problem of low capacity

Inactive Publication Date: 2017-04-26
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In our previous research work, we found that Ni-Fe LDH has a negative potential window in 1 M KOH solutio

Method used

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  • Vulcanized modification method for Ni-Fe LDH electrode material
  • Vulcanized modification method for Ni-Fe LDH electrode material
  • Vulcanized modification method for Ni-Fe LDH electrode material

Examples

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preparation example Construction

[0018] The concrete preparation method step of the present invention to Ni-Fe LDH vulcanization modification:

[0019] (1) Weigh ferrous chloride and nickel nitrate respectively according to the molar ratio of 1:1, and dissolve them in a mixed solvent of deionized water and ethylene glycol with a volume ratio of 2:3. A clear solution was obtained. Under magnetic stirring, add 10 times the urea of ​​nickel nitrate molar weight, under magnetic stirring, it is dissolved in ethylene glycol, in the mixed solution of ferrous chloride and nickel nitrate;

[0020] (2) Put the solution obtained in step (1) into a 50ml polytetrafluoroethylene lining, then put the nickel mesh into the polytetrafluoroethylene lining, then put the lining into a stainless steel hydrothermal kettle, seal it and put it Put it into a constant temperature drying oven at 85°C, and heat it at a constant temperature for 6h;

[0021] (3) Take out the nickel mesh, rinse the surface of the nickel mesh repeatedly wi...

Embodiment 1

[0028] Step 1: Dissolve 1mmol of ferric chloride and 1mmol of nickel nitrate into a mixed solvent of 20mL of deionized water and ethylene glycol (V / V=2 / 3) at the same time, and obtain a transparent solution under the action of ultrasound. Then, under magnetic stirring, add 10mmoL of urea into the solution, and after it is completely dissolved, pour the solution into a 50mL polytetrafluoroethylene liner, put the nickel mesh into the polytetrafluoroethylene liner containing the solution, Seal it with a stainless steel jacket, put it in a constant temperature drying oven at 85°C, and keep it warm for 6 hours. After the reaction kettle drops to room temperature, take out the nickel mesh, rinse the surface of the nickel mesh repeatedly with deionized water, and dry it under natural conditions.

[0029] Step 2: Add 0.5mmol thiourea to 50mL ethylene glycol, stir until fully dissolved, then pour the prepared solution into the reactor, put the sample from the previous step into the reac...

Embodiment 2

[0032] Compared with Example 1, except that the temperature (160° C.) in the second step is different, the others are the same as Example 1.

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Abstract

The invention discloses a vulcanized modification method for a Ni-Fe LDH electrode material. Urea is used as a precipitant and ferrous chloride is used as an iron source. Ni-Fe LDH grows on a nickel net substrate; and with a solvothermal method, vulcanization is carried out on the Ni-Fe LDH by using thiourea, sodium sulphide, or thioacetamide as a vulcanizing agent to obtain Ni-Fe LDH-S growing uniformly on the surface of the nickel net based on a cellular structure. Electrochemical performance evaluation is carried out on the Ni-Fe LDH-S in a 1M KOH electrolyte; and a potential window range is stabilized to be -1.1 to 0V. When constant-current charging and discharging are carried out in the potential window, the specific capacitance of the Ni-Fe LDH-S can reach 340 F/g, wherein the specific capacitance of the sample being Ni-Fe LDH without second-step vulcanization is only 45F/g. The result demonstrates that the specific capacity of the Ni-Fe LDH can be improved substantially.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a method for vulcanization modification of Ni-Fe LDH electrode materials. Background technique [0002] Supercapacitor, also known as electrochemical power supply, is a new type of energy storage device between conventional capacitors and secondary batteries, and has the advantages of high power density of conventional capacitors and high energy density of secondary batteries. In addition, supercapacitors also have the characteristics of no pollution to the environment, high efficiency, long cycle life, wide operating temperature range, and high safety. Supercapacitors have broad application prospects in new energy power generation, electric vehicles, information technology, aerospace, defense technology and other fields. [0003] According to the different energy storage mechanisms, supercapacitors can be divided into two types: one is the electric do...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30
CPCY02E60/13H01G11/86H01G11/24H01G11/30
Inventor 肖婷王书琳谭新玉向鹏姜礼华
Owner CHINA THREE GORGES UNIV
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