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Composite material having pn junction structure for supercapacitor, supercapacitor electrode material and preparation method thereof

A technology of supercapacitors and composite materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of internal resistance drop, working voltage drop, unfavorable supercapacitor energy storage density, etc., and increase the energy storage density , increase the resistance, the effect of low price

Inactive Publication Date: 2018-12-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although in this way, the specific capacitance can be increased, but the significant decrease in its internal resistance will lead to a significant decrease in the operating voltage
The amount of energy stored in a capacitor is proportional to the square of the operating voltage, such as Reducing the internal resistance in this way is not conducive to the improvement of the energy storage density of supercapacitors.

Method used

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  • Composite material having pn junction structure for supercapacitor, supercapacitor electrode material and preparation method thereof
  • Composite material having pn junction structure for supercapacitor, supercapacitor electrode material and preparation method thereof
  • Composite material having pn junction structure for supercapacitor, supercapacitor electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] MnO in this example 2 The synthesis of according to the chemical reaction equation:

[0048] MnSO 4 +H 2 o 2 +2NaOH=MnO 2 +2H 2 O+Na 2 SO 4

[0049] To be done.

[0050] First 4.66gBaTiO 3 powder in H 2 Heat treatment at 900°C for 8 hours in air.

[0051] Composite materials with pn junctions were obtained by in situ synthesis. Weigh 1.6g NaOH into a beaker, add 200ml deionized water to dissolve, and put the semiconducted BaTiO 3 The powder was transferred to the prepared NaOH solution, stirred vigorously and heated to 60°C as the base liquid. Weigh 3.38gMn(SO 4 )·H 2 O, put it into a small beaker, add 50mlH 2 O and 5ml 30% HO 2 o 2 Let it dissolve to form a titration solution. Add the titrant solution dropwise to the base solution, keep at 60°C and stir vigorously. After the titration is completed, a dark brown precipitate is obtained. After filtering and drying, the obtained composite powder is subjected to X-ray diffraction (XRD), and the diffracti...

Embodiment 2

[0054] MnO in this example 2 The synthesis of according to the chemical reaction equation:

[0055] MnSO 4 +H 2 o 2 +2NaOH=MnO 2 +2H 2 O+Na 2 SO 4

[0056] To be done.

[0057] The specific operation is as follows:

[0058] (1) First put 0.0226gY 2 o 3 (yttrium oxide) and 4.46g Ba 0.9 Sr 0.1 TiO 3 (BST) The powder was uniformly mixed and ground with an agate mortar for 1 h, then compacted at 1 Mpa, and sintered in air at 1280 ° C for 1 h to make it semiconducting. The cooled porcelain body is pulverized and passed through a 300-mesh sieve. The powder is light blue.

[0059] (2) The composite material with pn junction was obtained by in situ synthesis. Weigh 1.6g NaOH into a beaker, add 200ml deionized water to dissolve; transfer the BST powder that has been semiconducted in step (1) into the prepared NaOH solution, stir vigorously and heat to 80°C as the base liquid. Weigh 3.38gMnSO 4 ·H 2 O, put it into a small beaker, add 50mlH 2 O and 5ml 30% H 2 o 2...

Embodiment 3

[0062] Composite materials with ultrahigh dielectric constant were prepared by chemical liquid phase precipitation, in which MnO 2 The synthesis of according to the chemical reaction equation:

[0063] MnSO 4 +H 2 o 2 +2NaOH=MnO 2 +2H 2 O+Na 2 SO 4

[0064] To be done.

[0065] The specific operation is as follows:

[0066] (1) First, heat-treat 1.628g of ZnO in hydrogen at 800°C for 1h to make it semiconducting.

[0067] (2) The composite material with pn junction was obtained by in situ synthesis. Weigh 1.6g NaOH into a beaker, add 500ml deionized water to dissolve; transfer the ZnO powder that has been semiconducted in step (1) into the prepared NaOH solution, stir vigorously and heat to 60°C as the base liquid. Weigh 3.38gMnSO 4 ·H 2 O, put it into a small beaker, add 50mlH 2 O and 5ml 30% H 2 o 2 Let it dissolve to form a titration solution. Add the titrant solution dropwise to the base solution, keep at 60°C and stir vigorously. After the titration is c...

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PUM

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Abstract

The invention relates to a composite material having a pn junction structure for a supercapacitor, a supercapacitor electrode material and a preparation method thereof. The method is characterized byforming a pn junction between p-type oxide particles and n-type oxide particles by performing a physical or chemical method on p-type semi-conductive oxide powder and n-type semi-conductive oxide powder. The oxide particles having the pn junction can improve the resistance value of a supercapacitor material and can rapidly compensate the insertion charges in a charge / discharge process through thepn junction, thereby avoiding a sharp decrease in the resistance value caused by the introduction of a carbon-related material or metal powders, and greatly increasing the operating voltage and the energy density. Compared with an original p-type oxide (such as MnO2), the composite material obtained by the method of the present invention can increase the specific capacitance in addition to the operating voltage.

Description

technical field [0001] The invention relates to a composite material with a pn junction structure for a supercapacitor, a supercapacitor electrode material and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] Supercapacitor refers to a new type of energy storage device between traditional capacitors and rechargeable batteries. It not only has the characteristics of fast charging and discharging of capacitors, but also has the energy storage characteristics of batteries. According to different energy storage mechanisms, supercapacitors can be divided into two categories: electric double layer capacitors and faraday pseudocapacitors. Among them, the electric double layer capacitor mainly generates and stores energy through pure electrostatic charge, which is adsorbed on the electrode surface. Faraday pseudocapacitors mainly generate Faraday pseudocapacitors through reversible redox reactions on and near the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/24H01G11/86
CPCH01G11/24H01G11/46H01G11/86Y02E60/13
Inventor 齐建全汪晋宽马振伟张圆喜张琴琴李梦莹
Owner NORTHEASTERN UNIV
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