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A Supercapacitor with Fluid Pseudocapacitance Superposition

A technology of super capacitors and capacitors, applied in electrolytic capacitors, capacitors, circuits, etc., to achieve the effect of improving specific capacity, improving cycle life and low price

Inactive Publication Date: 2011-12-14
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are only simple carbon-carbon symmetric capacitors and metal oxide and conductive polymer pseudocapacitors.

Method used

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  • A Supercapacitor with Fluid Pseudocapacitance Superposition
  • A Supercapacitor with Fluid Pseudocapacitance Superposition
  • A Supercapacitor with Fluid Pseudocapacitance Superposition

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Preparation of carbon positive electrode and carbon negative electrode: Mix activated carbon powder, conductive carbon black and polytetrafluoroethylene (PTFE) at a mass ratio of 85:10:5, grind them fully in an agate mortar, and then roll them into thin sheets with a thickness of about 1 mm. . Cut out a disc with a diameter of 10mm, press it on the nickel foam current collector, and use it as an electrode after drying. Separate two identical electrodes with a grafted polypropylene non-woven fabric with a thickness of 0.1 mm, and place them in K 4 Fe(CN) 6 solution, assembled into a symmetrical electrochemical capacitor, the electrolyte solution K 4 Fe(CN) 6 The solution concentration is 0.1-1.0mol / L.

Embodiment 2

[0021] Preparation of carbon positive electrode and carbon negative electrode: Mix activated carbon powder, conductive carbon black and polyvinylidene fluoride (PVFE) at a mass ratio of 80:10:10 to make a slurry, then coat it on a 20 μm aluminum foil, dry, grind Press and cut into pieces to make electrode sheets. Separate two identical electrodes with a grafted polypropylene non-woven fabric with a thickness of 0.1 mm, and place them in K 4 Fe(CN) 6 solution, assembled into a symmetrical electrochemical capacitor, K 3 Fe(CN) 6 The solution concentration is 0.1mol / L.

Embodiment 3

[0023] Preparation of carbon positive electrode and carbon negative electrode: Mix activated carbon powder, conductive carbon black and polytetrafluoroethylene (PTFE) at a mass ratio of 85:10:5, grind them fully in an agate mortar, and then roll them into thin sheets with a thickness of about 1 mm. . Cut out a disc with a diameter of 10mm, press it on the nickel foam current collector, and use it as an electrode after drying. Two identical electrodes were separated by a grafted polypropylene non-woven fabric with a thickness of 0.1 mm, and placed in acidic MnSO 4 solution, assembled into a symmetrical electrochemical capacitor.

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Abstract

The invention discloses a supercapacitor superimposed with liquid flow pseudo-capacitance, which includes a carbon positive electrode, a carbon negative electrode, a diaphragm and an electrolyte for providing liquid flow pseudo-capacitance. The material components of the carbon positive electrode and the carbon negative electrode are the same, and the material components include: activated carbon, conductive agent and polytetrafluoroethylene adhesive; the diaphragm is grafted polypropylene paper, and the carbon positive electrode and carbon negative electrode are separated by the diaphragm and placed in the electrolyte. Due to the use of an electrolytic solution with redox properties that is different from traditional capacitors, the electric double layer capacitance and the pseudocapacitance provided by the liquid electrolyte can be simultaneously generated in the symmetrical carbon capacitor, thus improving the specific capacity of the capacitor. This new energy storage system with the performance of liquid flow battery and supercapacitor has potential application prospects in transportation, communication, national defense and other fields.

Description

technical field [0001] The invention belongs to the technical field of batteries and capacitors, in particular to a supercapacitor of an electric double layer capacitor, in particular to a supercapacitor superimposed on a carbon electric double layer capacitor by providing pseudocapacitance through liquid electrolyte oxidation reaction. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional electrostatic capacitors and chemical batteries. It has the advantages of fast charging speed, high discharging power and low cost. For supercapacitors with activated carbon as electrodes, those that store energy in the electric double layer are electric double layer capacitors; those that store energy in the Faraday redox reaction of transition metal oxides or conductive polymers are pseudocapacitors. [0003] There are two mechanisms for energy storage in capacitors using transition metal oxides as electrodes. One is through the change o...

Claims

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Application Information

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IPC IPC(8): H01G9/042H01G9/02H01G9/035
CPCY02E60/13
Inventor 田颖
Owner DALIAN JIAOTONG UNIVERSITY
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