Novel mixed super capacitor

A supercapacitor, a new type of technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve problems such as expensive, large-scale commercial application restrictions, and narrow charge and discharge potential range

Inactive Publication Date: 2009-04-01
SHANGHAI UNIV
View PDF0 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hydrated RuO as an electrode material for redox supercapacitors 2 It has the advantages of high specific capacitance and good cycle stability in sulfuric acid solution, but it is expensive and its large-scale commercial application is limited
Therefore, other metal oxides such as NiO, Co 3 o 4 and MnO 2 etc. are paid attention to, among which NiO and Co 3 o 4 The charge and discharge potential range is narrow

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Novel mixed super capacitor
  • Novel mixed super capacitor
  • Novel mixed super capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The hybrid supercapacitor of the present invention is made up of a positive electrode sheet, a negative electrode sheet, a diaphragm between the two, and an alkaline electrolyte with ion conductivity, and is characterized in that: the positive electrode active material of the capacitor is Nano MnO 2 The electrode material, the negative electrode active material is porous activated carbon, the diaphragm is a polypropylene film, and the electrolyte is LiOH aqueous solution with a concentration of 1 mol / liter to 3 mol / liter.

[0025] The production of the positive electrode sheet: manganese acetate (MnAc 2 4H 2 O) and citric acid (C 6 h 8 o 7 ·H 2 O) as a raw material, ground in a mortar, a low-heat solid-state reaction occurs, and a precursor is obtained. The precursor is calcined in an air atmosphere at 300°C for 10 hours, and then subjected to 2mol / L H 2 SO 4 The solution was acidified for 2 hours, washed and dried to obtain nano-MnO 2 Material. N...

Embodiment 2

[0026] Embodiment two: this embodiment is basically the same as embodiment 1, the difference is: with the manganese chloride (MnCl 2 4H 2 O) and ammonium bicarbonate (NH 4 HCO 3 ) as a raw material, ground in a mortar, a low-heat solid-state reaction occurs, and a precursor (MnCO 3 with NH 4 Cl mixture), the precursor was calcined at 350°C in an air atmosphere for 10 hours, and then subjected to 2mol / LH 2 SO 4 The solution was acidified for 2 hours, washed and dried to obtain nano-MnO 2 Material. The nanometer MnO obtained by this method is used in the positive electrode 2 Material production, negative electrode, electrolyte and separator are all the same as in Example 1, and the manufacturing process of the electrode is also the same as in Example 1, forming nano-MnO 2 / Activated carbon supercapacitor. The charge-discharge cycle life of the capacitor at a voltage range of 0.5-1.5V and a current density of 500mA / g is as follows: Figure 4 shown. After 5000 cycles, ...

Embodiment 3

[0027] Embodiment three: the present embodiment is basically the same as embodiment 1, the difference is: with the manganese chloride (MnCl 2 4H 2 O) and ammonium oxalate ((NH 4 ) 2 C 2 o 4 ·H 2 O) as a raw material, ground in a mortar, a low-heat solid-phase reaction occurs. The solid-phase reaction product was dissolved in water to remove soluble matter, and the manganese oxalate precursor was obtained after drying. The precursor was calcined in air at 400°C for 10 hours, and then subjected to 2mol / L H 2 SO 4 The solution was acidified for 2 hours, washed and dried to obtain nano-MnO 2 Material. The nanometer MnO obtained by this method is used in the positive electrode 2 Material production, negative electrode, electrolyte and separator are all the same as in Example 1, and the manufacturing process of the electrode is also the same as in Example 1, forming nano-MnO 2 / Activated carbon supercapacitor. The energy-power relationship (Ragone diagram) of the capacit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a novel mixed super capacitor which adopts a nano MnO2 electrode as a positive electrode, an activated carbon electrode as a negative electrode and alkaline lithium hydroxide water solution as electrolyte. The positive electrode stores energy by a Faraday oxidation reduction mechanism, and the negative electrode stors energy by a double electrode layer mechanism. When the lithium hydroxide electrolyte is adopted, the reaction mechanism of the nano MnO2 electrode is different from the reaction mechanism in potassium hydroxide electrolyte or neutral water solution. Therefore, the nano MnO2 electrode has higher specific capacitance. The super capacitor has the advantages of perfect high energy intensity, high power intensity, high-rate charge and discharge performance, long circulation service life, low cost and no environmental damages and can be applied to large power charge and discharge occasions.

Description

technical field [0001] The invention relates to the field of chemical power sources, in particular to a nano-MnO with LiOH aqueous solution as electrolyte, which has excellent high-rate charge-discharge performance, high energy and power density, long cycle life, low cost and environmental friendliness 2 / Activated carbon hybrid supercapacitor; also involves high specific capacity cathode material doped with nanometer MnO 2 method of preparation. Background technique [0002] Electrochemical supercapacitor is a new type of energy storage device with performance between conventional capacitors and secondary batteries. It has the advantages of high power density of conventional capacitors and high energy density of secondary batteries. It has broad application prospects in fields such as instruments and electric vehicle hybrid power systems. According to the energy storage mechanism, electrochemical supercapacitors can be divided into two categories: electric double layer c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/02H01G9/042H01G9/035H01G9/22
CPCY02E60/13
Inventor 袁安保王秀玲胡洁王玉芹田磊
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap