Supercapacitor electrode material and preparation method thereof

A technology for supercapacitors and electrode materials, applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of small effective specific surface area, poor conductivity, insufficient energy density, etc., and achieve excellent cycle performance and good conductivity , the effect of large specific surface area

Inactive Publication Date: 2019-03-01
JIANGSU JINYI NEW ENERGY TECH CO LTD
3 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

MnO 2 It is a very potential electrode material, which shows a wide potential window and good capacitance performance in neutral electrolyte, and is rich in sources, non-toxic and harmless, and widely praised; but MnO 2 The poor conductivity and small effective specific surface area are unfavorable factors restricting its promotion as a supercapacitor electrode material, and ...
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Abstract

The invention relates to a supercapacitor electrode material. The supercapacitor electrode material is a graphene gel/MnO2 composite material, graphite oxide is taken as a precursor, single-layer oxidized graphene is obtained by using an ultrasonic method and is dispersed into deionized water, MnCl2 is added for ultrasonic stirring and uniform dispersion, then hydrazine hydrate is added for uniform stirring to obtain a mixed solution, the mixed solution is poured into a hydrothermal reactor for a hydrothermal reaction, and suction filtration, washing and drying are carried out on a reaction product to obtain the graphene gel/MnO2 composite material. The composite material has the characteristics of great specific surface area, high electroconductibility, high capacitance and excellent cycle performance.

Application Domain

Hybrid capacitor electrodesHybrid/EDL manufacture

Technology Topic

IonCapacitance +10

Image

  • Supercapacitor electrode material and preparation method thereof
  • Supercapacitor electrode material and preparation method thereof
  • Supercapacitor electrode material and preparation method thereof

Examples

  • Experimental program(3)

Example Embodiment

[0017] Example 1
[0018] 1) Using graphite oxide as the precursor, the single-layer graphene oxide is obtained by ultrasonic method and dispersed in deionized water, and MnCl is added 2 Disperse uniformly by ultrasonic stirring. The graphene oxide concentration is 2g/L; MnCl 2 The concentration is 3g/L.
[0019] 2) Add hydrazine hydrate with a volume ratio of 1/3 to the solution in step 1), and the hydrazine hydrate concentration is 26%.
[0020] 3) Pour the mixed solution in step 2) into a hydrothermal reaction kettle for hydrothermal reaction, the hydrothermal reaction temperature is 95°C, and the hydrothermal time is 20h. ;
[0021] 4) The reaction product in step 3) is filtered, washed, and dried to obtain graphene gel/MnO 2 For composite materials, the drying temperature is 70°C and the drying time is 9h.
[0022] The above graphene gel/MnO 2 After the composite material is mixed with SuperP and PVDF at a mass ratio of 30:2:1, a supercapacitor is made with carbon as a reference electrode to test the electrochemical performance of the material.
[0023] Test Results:
[0024]

Example Embodiment

[0025] Example 2
[0026] 1) Using graphite oxide as the precursor, the single-layer graphene oxide is obtained by ultrasonic method and dispersed in deionized water, and MnCl is added 2 Disperse uniformly by ultrasonic stirring. The graphene oxide concentration is 2g/L; MnCl 2 The concentration is 1g/L.
[0027] 2) Add hydrazine hydrate with a volume ratio of 1/3 to the solution in step 1), and the hydrazine hydrate concentration is 20%.
[0028] 3) Pour the mixed solution in step 2) into a hydrothermal reaction kettle for hydrothermal reaction, the hydrothermal reaction temperature is 95°C, and the hydrothermal time is 20h. ;
[0029] 4) The reaction product in step 3) is filtered, washed, and dried to obtain graphene gel/MnO 2 For composite materials, the drying temperature is 70°C and the drying time is 9h.
[0030] The above graphene gel/MnO 2 After the composite material is mixed with SuperP and PVDF at a mass ratio of 30:2:1, a supercapacitor is made with carbon as a reference electrode to test the electrochemical performance of the material.
[0031] Test Results:
[0032]

Example Embodiment

[0033] Example 3
[0034] 1) Using graphite oxide as the precursor, the single-layer graphene oxide is obtained by ultrasonic method and dispersed in deionized water, adding MnCl 2 Disperse uniformly by ultrasonic stirring. The graphene oxide concentration is 2g/L; MnCl 2 The concentration is 5g/L.
[0035] 2) Add hydrazine hydrate with a volume ratio of 1/3 to the solution in step 1), and the hydrazine hydrate concentration is 30%.
[0036] 3) Pour the mixed solution in step 2) into a hydrothermal reaction kettle for hydrothermal reaction, the hydrothermal reaction temperature is 95°C, and the hydrothermal time is 20h. ;
[0037] 4) The reaction product in step 3) is filtered, washed, and dried to obtain graphene gel/MnO 2 For composite materials, the drying temperature is 70°C and the drying time is 9h.
[0038] The above graphene gel/MnO 2 After the composite material is mixed with SuperP and PVDF in a mass ratio of 30:2:1, a supercapacitor is made with carbon as a reference electrode to test the electrochemical performance of the material.
[0039] Test Results:
[0040]

PUM

no PUM

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