Water phase ultra-capacitor used at working voltage of between 2.4 and 3.0V and method for preparing same

A supercapacitor, working voltage technology, applied in the direction of electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve the problem of reducing the working voltage and capacitance of the capacitor unit, and achieve the effect of improving the working voltage, simple preparation process, and easy industrial application.

Inactive Publication Date: 2011-05-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrodes are connected in series to produce mass accumulation at the same time, which leads to an increase in the working voltage of the capacitor unit and a significant decrease in the specific capacitance.

Method used

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  • Water phase ultra-capacitor used at working voltage of between 2.4 and 3.0V and method for preparing same
  • Water phase ultra-capacitor used at working voltage of between 2.4 and 3.0V and method for preparing same
  • Water phase ultra-capacitor used at working voltage of between 2.4 and 3.0V and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Amorphous-MnO Synthesized by Liquid Phase Precipitation 2 , Weigh 0.40g of potassium permanganate and put it in a flask, add 15ml of deionized water to make solution A. Weigh 0.93g of manganese acetate and put it in a flask, add 25ml of deionized water to make solution B. Solution B was slowly dropped into solution A, and the mixture was continuously stirred for 6h. The reactant was filtered, washed with ethanol or water, and the collected product was dried at 110°C, and the product amorphous-MnO 2 The BET specific surface area is 325m 2 / g; convert amorphous-MnO 2 , activated carbon and PTFE by amorphous-MnO 2 : activated carbon: polytetrafluoroethylene=45wt%: 45wt%: 10wt% mixed to form manganese oxide / activated carbon composite positive electrode;

[0042] Activated carbon and polytetrafluoroethylene are mixed according to activated carbon: polytetrafluoroethylene=90wt%: 10wt% to form an activated carbon cathode, and the BET specific surface area containing activ...

Embodiment 2

[0045] The operation method is the same as in Example 1, and the liquid phase precipitation method synthesizes amorphous-MnO 2 , the difference is: amorphous-MnO 2 : activated carbon: polytetrafluoroethylene=60wt%: 30wt%: 10wt% mixed to form manganese oxide / activated carbon composite positive electrode. The operating voltage of the capacitor in this example is 2.8V, and the measured specific capacitance is 19F / g.

Embodiment 3

[0047] The operation method is the same as in Example 1, and the liquid phase precipitation method synthesizes amorphous-MnO 2 , the difference is that the activated carbon is replaced by hierarchical porous carbon in the positive electrode material. amorphous-MnO 2 , Hierarchical carbon and PTFE by amorphous-MnO 2 : Hierarchical carbon: polytetrafluoroethylene=45wt%: 45wt%: 10wt% mixes and forms manganese oxide / hierarchical carbon composite positive electrode; Wherein the BET specific surface area of ​​hierarchical porous carbon is 2492m 2 / g. The operating voltage of the capacitor in this example is 2.8V, and the measured specific capacitance is 17F / g.

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Abstract

The invention belongs to the technical field of ultra-capacitors, and in particular relates to a water phase ultra-capacitor used at a working voltage of between 2.4 and 3.0V and a method for preparing the same. The capacitor consists of a manganese oxide / active carbon composite electrode material, an active carbon cathode, an electrolyte, a diaphragm, an anode lead, a cathode lead and a shell. The invention utilizes dual functions of the active carbon in the positive electrode in different voltage ranges, which are a conductive agent and an anode active material, and simultaneously the capacitor unit shows behaviors of an asymmetrical capacitor as well as a symmetrical capacitor, so that the working voltage of the ultra-capacitor unit is essentially improved; at the same time, the asymmetrical capacitor has better electrochemical behaviors and can more reasonably achieve power density and energy density, so that the high-power quick discharge is made possible, and the range of the working voltage of the capacitor unit is widened; the process of preparing electrode materials is simple; and a neutral water phase electrolyte is used, so that the ultra-capacitor is easy for industrialized application.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to an asymmetric supercapacitor which can be used stably in an aqueous electrolyte and whose working voltage can reach 2.4-3.0V and a preparation method thereof. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage element between traditional capacitors and batteries. It has the characteristics of high power density, long life, wide operating temperature range and environmental friendliness. Supercapacitors can provide high energy in a short time and are suitable for fast charging and discharging electronic devices. However, supercapacitors also have the problem of low energy density in practical applications. Currently commercialized supercapacitors mostly use organic electrolytes to increase the energy density of their capacitor units. However, the organic electrolyte has disadvantages such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/145H01G9/042H01G9/035
CPCY02E60/13
Inventor 李文翠高鹏程
Owner DALIAN UNIV OF TECH
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