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A manganese bioxide electrochemical super capacitor

A technology of supercapacitor and manganese dioxide, which is applied in the field of capacitors, can solve the problems of difficult breakthrough of EDLC energy density, achieve high energy density and increase the average output voltage

Inactive Publication Date: 2008-10-15
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in some environments that require high-energy-density power supplies, such as in electric vehicles, the power supply is required to have high energy density. High-voltage organic EDLCs also have great potential uses in similar aspects, but due to porous carbon The material (referred to as activated carbon or AC) is limited by its own performance, and its capacity in the organic electrolyte is difficult to exceed 100F / g, so the energy density of the organic system EDLC is difficult to break through 5-8Wh / Kg

Method used

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  • A manganese bioxide electrochemical super capacitor
  • A manganese bioxide electrochemical super capacitor
  • A manganese bioxide electrochemical super capacitor

Examples

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Embodiment 1

[0021] The manganese dioxide positive electrode material was prepared by microemulsion method, and a certain amount of surfactant sodium bis(2-ethylhexyl)sulfosuccinate (sodium bis(2-ethylhexyl)sulfosuccinate, AOT) was put into isooctane and stirred evenly to form a concentration of 0.1mol / L solution, while stirring, add a certain amount of potassium permanganate aqueous solution with a concentration of 0.1mol / L and make the molar ratio of water and surfactant AOT to 60. After all the addition is complete, continue stirring for 4h. Then carry out suction filtration, filter with water and absolute ethanol for 5 times respectively to obtain a brown filter cake, and dry to obtain black manganese dioxide powder. Using water as a dispersant, mix the prepared manganese dioxide, conductive agent acetylene black, and binder PTFE (polytetrafluoroethylene) in a mass ratio of 55:35:10, press it on a stainless steel mesh, and cut it into a certain size. Size, dry in vacuum. Commercial ac...

Embodiment 2

[0023] With manganese dioxide as the positive electrode, activated carbon as the negative electrode, and a commercial supercapacitor separator as the diaphragm, 0.1mol / L Ca(NO 3 ) 2 The aqueous solution is used as the electrolyte to assemble the button capacitor. The preparation of the positive electrode material and the positive and negative electrode membranes is as in Example 1, and the mass ratio of the positive and negative electrode active materials manganese dioxide and activated carbon is 1:3. The cyclic voltammogram of the electrochemical capacitor is shown in Example 2, and the scan rate is 2mV / s. When the current is 0.5A / g, the constant current charge and discharge curve of this capacitor is shown in Example 3. The working voltage of this capacitor can reach 2V, which is greatly improved compared with EDLC (1V), and the specific energy has reached 26Wh / Kg (based on Calculate the total mass of positive and negative active materials).

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Abstract

The invention discloses a manganese dioxide electrochemical supercapacitor, comprising the following steps: the pseudocapacitance of the manganese dioxide and a double electrode layer capacitance mechanism of large specific surface area carbon material are combined into a maintaining power, the positive electrode adopts manganese dioxide material with high capacity, the negative electrode adopts high large specific surface area carbon material, an aqueous solution system or a non-aqueous solution system containing bivalent cations, thus forming the asymmetric electrochemical capacitor. As different materials are adopted in different electrochemical windows of the same electrolyte, individual voltage of the asymmetric electrochemical capacitor can be up to 2V or more, and as the bivalent cations are adopted as the cations of the electrolyte, the specific capacity of the positive electrode and the negative electrode are improved; therefore, the supercapacitor is characterized of high energy density and high power density, etc.

Description

technical field [0001] The invention belongs to the technical field of capacitors, and in particular relates to a hybrid capacitor in which manganese dioxide is used as a positive electrode material, a carbon material with a high specific surface area is used as a negative electrode material, and an electrolyte contains divalent cations. Background technique [0002] With the continuous development of the economy, it will inevitably lead to the shortage of oil resources and the pollution of the environment. Therefore, the comprehensive and efficient development and utilization of new green energy has become a very necessary topic. Due to the advantages of fast charging and discharging, no pollution to the environment, and long cycle life, electrochemical capacitors (supercapacitors) are expected to become one of the most potential new green energy sources in this century, and are expected to be used in mobile communications, information technology, and consumer electronics. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/022H01G9/04H01G9/00H01M10/00H01M14/00
CPCY02E60/13
Inventor 徐成俊李宝华杜鸿达康飞宇赵丰刚曾毓群
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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