Electrochemistry mixing capacitor base on water system (acid) electrolyte

A hybrid capacitor and electrolyte technology, applied in electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve the problem of less electrolyte solution

Inactive Publication Date: 2009-04-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, we found that the research in this area is mainly focused on the improvement of the specific capacity of the elec

Method used

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  • Electrochemistry mixing capacitor base on water system (acid) electrolyte
  • Electrochemistry mixing capacitor base on water system (acid) electrolyte
  • Electrochemistry mixing capacitor base on water system (acid) electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepare a concentration of 1M H 2 SO 4 Aqueous solution and containing concentration of 1M H 2 SO 4 with 0.2MLi 2 SO 4 、1M H 2 SO 4 with 0.2M Na 2 SO 4 and 1M H 2 SO 4 with 0.2M K 2 SO 4 mixed solution as a supporting electrolyte.

experiment example 1

[0016] Mix the obtained activated carbon with acetylene black and PTFE at a ratio of 8.5:1.0:0.5 (mass ratio), add a little deionized water dropwise after grinding to make it evenly mixed, and press it on the carbon electrode under a pressure of 12MPa to make a working electrode. The area is 3.14cm 2 . A three-electrode system was used to test the performance of electrode materials. A saturated calomel electrode (SCE) was selected as the reference electrode, and a platinum electrode (1cm×1cm) was used as the counter electrode. 2 SO 4 , 1MH 2 SO 4 +0.2M Li 2 SO 4 、1M H 2 SO 4 +0.2M Na 2 SO 4 with 1M H 2 SO 4 +0.2M K 2 SO 4 The solution is the supporting electrolyte. The above-mentioned three electrodes were immersed in the above-mentioned three kinds of electrolytes to form a three-electrode system, and the performance test of the capacitor was carried out. All tests were carried out at room temperature, and the electrochemical behavior was characterized by a CHI...

experiment example 2

[0018] According to the method for preparing the working electrode in Experimental Example 1, prepare two working electrodes as the positive and negative electrodes respectively, wherein the ratio of the activated carbon mass of the positive electrode to the negative electrode is 1:1, immersed in the above-mentioned electrolyte to form a simulated capacitor, and simulate Capacitor performance test. All tests were carried out at room temperature, and the electrochemical behavior was characterized by a CHI660B electrochemical workstation (Shanghai Chenhua Instrument Co., Ltd.). The cyclic voltammetry and constant current charge and discharge diagrams of the simulated capacitors are shown in image 3 and 4 As shown, the specific capacitance and specific energy density of the assembled hybrid capacitors are also shown in Table 2.

[0019] Table 1: Indicates the single-electrode specific capacitance of the prepared electrode materials

[0020]

[0021] Table 2: Indicates the ...

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Abstract

An electrochemical hybrid capacitor which is based on a water-based acidic electrolyte belongs to the technical field of chemical power supplies. A positive electrode in the electrochemical hybrid capacitor adopts electrode materials and carbon materials which are applicable to water-based inorganic acid solution; a negative electrode adopts one or the mixture of more than two of activated carbon with porous structure, mesoporous carbon, carbon fiber and carbon aerogel; the electrochemical hybrid capacitor is characterized in that the support electrolyte is water-based acidic solution containing metal salts, wherein, the metal salts comprise one or the mixture of more than two of the metal salts which are easily dissolved in H2SO4, H3PO4, HCL or HNO3 solution and contain inorganic metal irons with the valence states of +1, +2 and +3. Compared with the general non-symmetric hybrid capacitor, the supercapacitor has higher energy density due to the addition of the metal salts; furthermore, as the sources of the materials are wide, the cost is low and the preparation is easy, the electrochemical hybrid capacitor has great application prospect.

Description

technical field [0001] The patent of the present invention relates to an electrochemical hybrid capacitor based on aqueous acidity, which belongs to the technical field of chemical power sources. Background technique [0002] With the continuous development of the economy, the depletion of fossil resources and the continuous aggravation of environmental pollution. The comprehensive and high-efficiency development and utilization of new energy, high-efficiency energy utilization technology, and environmental technology has become a very necessary subject. Because supercapacitors (also known as electrochemical capacitors) can store more than 10 times the energy of electrostatic capacitors and have a power density 10 to 100 times higher than batteries, they can release large current densities instantly, and have high charge and discharge efficiency, Excellent low temperature performance, long cycle life and no memory effect. Therefore, supercapacitors not only have very obvio...

Claims

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Application Information

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IPC IPC(8): H01G9/035H01G9/145
CPCY02E60/13
Inventor 张校刚高博
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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