Dissymmetrical supercapacitor with high energy density and method for preparing same

A supercapacitor, high energy density technology, applied in the direction of capacitors, electrolytic capacitors, capacitor parts, etc., can solve the problem of low energy density of capacitors, achieve the effect of widening the working voltage range, increasing specific capacitance, and increasing energy density

Inactive Publication Date: 2009-09-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low energy density of capacitors in aqueous electrolyte, combined with the higher hydrogen polarization overvoltage of the carbon negative electrode and the higher oxygen polarization overvoltage of the manganese oxide positive electrode, a porous carbon is assembled into a Characteristics of electric double layer capacitors and asymmetric supercapacitors utilizing pseudocapacitance simultaneously

Method used

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  • Dissymmetrical supercapacitor with high energy density and method for preparing same
  • Dissymmetrical supercapacitor with high energy density and method for preparing same
  • Dissymmetrical supercapacitor with high energy density and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0035] α-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 α-MnO 2 The BET specific surface area is 147m 2 / g; the α-MnO 2 , acetylene black and polytetrafluoroethylene by α-MnO 2 : Acetylene black: polytetrafluoroethylene = 70wt%: 20wt%: 10wt% mixed to form a manganese oxide anode;

[0036] Porous carbon and polytetrafluoroethylene are mixed according to porous carbon: polytetrafluoroethylene = 90wt%: 10wt% to form a porous carbon cathode, and the BET specific surface area of ​​nitrogen-containing porous carbon is 2492m 2 / g;

[0037] Stack the anod...

Embodiment 2

[0039] α-MnO Synthesized by Hydrothermal Method 2 , Weigh 1.0g of potassium permanganate and 0.42g of manganese sulfate in a flask, and keep stirring until the solution is clear. The solution was poured into a 150ml Teflon reaction kettle, sealed with stainless steel, and reacted at 160°C for 12h. The reactant was filtered, washed with ethanol or water, and the collected product was dried at 110°C, and the product α-MnO 2 The BET specific surface area is 51m 2 / g. α-MnO 2 , acetylene black and polytetrafluoroethylene by α-MnO 2 : Acetylene black: polytetrafluoroethylene = 70wt%: 20wt%: 10wt% mixed to form a manganese oxide anode;

[0040] Porous carbon and polytetrafluoroethylene are mixed according to porous carbon: polytetrafluoroethylene = 90wt%: 10wt% to form a porous carbon cathode, and the BET specific surface area of ​​nitrogen-containing porous carbon is 2492m 2 / g;

[0041] Stack the anode, diaphragm and cathode in sequence to form a compact structure, inject e...

Embodiment 3

[0043] The operating method is the same as in Example 2, and the hydrothermal method synthesizes β-MnO 2, the difference is: Potassium permanganate weighed 0.28g, manganese sulfate weighed 0.90g, the reaction product β-MnO 2 The BET specific surface area is 10m 2 / g, the BET specific surface area of ​​nitrogen-containing porous carbon is 2492m 2 / g. The operating voltage of the capacitor in this example is 2V, and the measured specific capacitance is 19F / g.

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Abstract

The invention belongs to the technical field of supercapacitors, and relates to a dissymmetrical supercapacitor with high energy density and a method for preparing the same. The capacitor consists of a manganese oxide anode, a porous carbon cathode, an electrolyte, a septum, an anode lead wire, a cathode lead wire and a shell. The method combines manganese oxide as high oxygen polarized overvoltage of an anode and porous carbon as hydrogen polarized overvoltage of a cathode to form a dissymmetrical capacitor element so as to essentially improve the working voltage (2V) of a supercapacitor unit. Compared with the working voltage of between 0.6 and 0.8 V of a single-material capacitor unit in a water-phase electrolyte, the dissymmetrical supercapacitor improves the energy density of the capacitor to a large extent, thereby making the rapid large-power charging and discharging possible and broadening the range of the working voltage of the capacitor unit; and a process for preparing an electrode material is simple, adopts a neutral water-phase electrolyte and 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 with high energy density and a preparation method thereof. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage device between traditional capacitors and batteries. It has the characteristics of high power density, moderate energy density, long life, wide operating temperature range and environmental friendliness. Especially in electronic devices that require fast charging and discharging, supercapacitors can provide high energy in a short time, which is more competitive than batteries and has a tendency to replace them. However, there are also problems with supercapacitors: Due to the limitation of the breakdown voltage of the electrolyte, the unit operating voltage range of supercapacitors is usually very small, which limits the improvement of energy density and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/058H01G9/035H01G9/038H01G9/08H01G9/155H01G11/30H01G11/62
CPCY02E60/13
Inventor 李文翠高鹏程农谷珍
Owner DALIAN UNIV OF TECH
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