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Preparation method of nickel molybdate/carbon electrode material and prepared supercapacitor

A technology for supercapacitors and carbon electrodes, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor separators, hybrid capacitor electrodes, etc., can solve the problem of conductivity limiting ion shuttle and electron migration, limiting electrochemical performance development and application prospects and other problems, to achieve excellent rate performance and cycle stability, high specific capacitance, and simple and easy preparation method

Inactive Publication Date: 2020-04-10
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low conductivity of metal molybdates limits ion shuttling and electron migration during electrochemical reactions.
Greatly limit the electrochemical performance development and application prospect of this kind of material

Method used

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  • Preparation method of nickel molybdate/carbon electrode material and prepared supercapacitor
  • Preparation method of nickel molybdate/carbon electrode material and prepared supercapacitor
  • Preparation method of nickel molybdate/carbon electrode material and prepared supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a preparation method of nickel molybdate / carbon electrode material, the preparation steps are as follows:

[0032] Dissolve 0.1209 g of sodium molybdate dihydrate and 0.1184 g of nickel chloride hexahydrate in 5 mL of water and 3 mL of cyclohexane, respectively. Add nickel chloride Rongfeng dropwise into the sodium molybdate solution, stir the mixed solution for 30 minutes, transfer it to a polytetrafluoroethylene-lined stainless steel autoclave with a capacity of 30ml, and react in a constant temperature blast drying oven at 100°C for 24 hours. Wash with ethanol and distilled water and centrifuge 3 to 5 times, and dry overnight in a constant temperature blast drying oven at 60°C to obtain the precursor electrode material.

[0033] The precursor electrode material was heated to 600 °C for 2 hours in an inert gas atmosphere, and the heating rate was 5 °C min -1 ,get figure 1 The nickel molybdate / carbon composite electrode material shown.

[00...

Embodiment 2

[0036] This embodiment provides a preparation method of nickel molybdate / carbon electrode material, the preparation steps are as follows:

[0037] Dissolve 0.1209 g of sodium molybdate dihydrate and 0.1184 g of nickel chloride hexahydrate in 5 mL of water and 3 mL of cyclohexane, respectively. Drop the nickel chloride solution into the sodium molybdate solution, stir the mixed solution for 30 minutes, transfer it to a polytetrafluoroethylene-lined stainless steel autoclave with a capacity of 30ml, and react it in a constant temperature blast drying oven at 120°C for 18 hours. Wash with ethanol and distilled water, centrifuge for 3-5 times, and dry overnight in a constant temperature blast drying oven at 60°C to obtain the precursor electrode material.

[0038] The precursor electrode material was heated to 600 °C for 2 hours in an inert gas atmosphere, and the heating rate was 5 °C min -1 ,get figure 1 The nickel molybdate / carbon composite electrode material shown.

Embodiment 3

[0040] This embodiment provides a kind of supercapacitor, and its preparation steps are as follows:

[0041] Preparation of the positive electrode: the nickel molybdate / carbon electrode material, carbon nanotubes, acetylene black and polyvinylidene fluoride prepared in Example 1 were weighed at a mass ratio of 6:2:1:1, and then 5 mL of ethanol was added Disperse and mix to make a slurry, coat it on the nickel foam, then dry, press and other steps to make a positive electrode, the loading capacity of the positive electrode nickel / carbon electrode material is 4 mg / cm 2 ;

[0042] Preparation of negative electrode: Weigh commercial activated carbon and polyvinylidene fluoride at a mass ratio of 8:1, put them into a 10 mL beaker, disperse and mix them to make slurry, coat them on foamed nickel, dry them, and press them into tablets. Negative electrode, the activated carbon loading of the negative electrode is 13mg / cm 2 .

[0043] Assembly of the supercapacitor: Stack the prepar...

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Abstract

The invention provides a preparation method of a nickel molybdate / carbon electrode material and a prepared supercapacitor. The nickel molybdate / carbon electrode material is a porous one-dimensional electrode material prepared by taking sodium molybdate dehydrate, nickel chloride hexahydrate, deionized water and cyclohexane as raw materials through a solvothermal method and an annealing step, and the preparation method is simple and easy to implement, high in yield and easy to industrially amplify, and has a good application prospect. A supercapacitor prepared from the nickel molybdate / carbon composite electrode material has relatively high specific capacitance, excellent rate capability and cycling stability. And rapid charging and discharging under high current density can be effectivelyrealized. Under the current density of 0.5 Ag<-1>, the capacity of a single electrode is as high as 325.1 F g<-1>. When the current density is increased to 8 A g <-1>, the capacity is still kept at 182.1 F g<-1>, and after 10000 circles of circulation under the current density of 5 A g<-1>, the capacity still reaches 105.8 F g<-1>.

Description

technical field [0001] The invention relates to the technical field of synthesis of supercapacitor electrode materials, in particular to a method for preparing a nickel molybdate / carbon electrode material and a prepared supercapacitor. Background technique [0002] Energy is an important material basis for human survival and social development, and plays a decisive role in the development of the national economy and the progress of human civilization. At present, the severe consumption of non-renewable fossil energy such as oil and coal has brought about increasingly serious environmental problems and non-renewable energy crisis. In order to cope with this worldwide problem and crisis, scientists from all over the world are committed to research and utilization of new renewable energy, including solar energy, wind energy, geothermal energy, biomass energy, etc. Energy storage devices play a vital role in the efficient use of new energy. [0003] As a typical energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/52H01G11/58H01G11/84H01G11/86
CPCH01G11/24H01G11/32H01G11/52H01G11/58H01G11/84H01G11/86Y02E60/13
Inventor 米立伟童勃荔卫武涛王静叶婉玉崔世忠陈卫华
Owner ZHONGYUAN ENGINEERING COLLEGE
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