Redox active reversible electrode and novel cell using it

An active and electrode technology, which is applied in the field of redox active reversible electrodes, can solve the problems of low conductivity or low conductivity, difficulty in increasing the electric energy of the battery, and difficulty in selecting the best conditions for the reaction.

Inactive Publication Date: 2005-05-18
小山升 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned organic sulfur-containing compound is characterized by high energy density, it has been found that it is difficult to increase the electric energy extracted per unit weight in a battery using the organic sulfur-containing compound and polyaniline.
The main reason is that the above-mentioned organic sulfur-containing compounds do not have conductivity or have low conductivity, so only a thin film with a thickness of several μm to tens of μm can act as an electrode, and polyaniline is reduced at a relatively high potential. However, the protons participate in the redox reaction and the mechanism is complex, and the catalytic energy corresponding to the redox reaction of sulfur compounds depends to a large extent on the acidity of the electrolyte, that is, the proton concentration, so it is difficult to choose the optimal reaction. good condition

Method used

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  • Redox active reversible electrode and novel cell using it
  • Redox active reversible electrode and novel cell using it
  • Redox active reversible electrode and novel cell using it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Among the thiophene compounds represented by formula (II), specially formulated EDOT polymer containing 20mM and 0.1M lithium perchlorate (LiClO 4 ) in acetonitrile (AN) solution (solution for electrolytic polymerization).

[0075]PEDOT covered electrodes were fabricated as follows. A 3-electrode battery is used, using an enamel carbon disc electrode with a diameter of 3mm as the working electrode, a coil-shaped platinum wire as the counter electrode, and a silver ion electrode as the reference electrode, and passing through the above-mentioned solution for electrolytic polymerization. Electrolytic oxidative polymerization was performed to fabricate PEDOT-covered electrodes. 0.05M silver perchlorate was dissolved in the used solvent (AN), and this was used as an internal solution, and a silver ion electrode was fabricated using a commercially available electrode holder. In addition, the enamel carbon disk electrode was used after polishing with alumina for polishing o...

Embodiment 2

[0078] As a representative example of organic sulfur-containing compounds, 2,5-dimercapto-1,3,4-thiadiazole (DMcT) was selected, and 1.0 M LiClO containing 5 mM DMcT was prepared. 4 AN solution, or 1.0M LiClO 4 1.0M LiBF dissolved in a solution of N-methyl-2-pyrrolidone (NMP) or a mixture of propylene carbonate (PC) and ethylene carbonate (EC) at a weight ratio of 1:1 4 of electrolyte. The CV measurement was carried out by using the battery in which the crushed carbon electrode as the working electrode was immersed in the above-mentioned electrolyte solution and the PEDOT film covered the crushed carbon electrode prepared by the method in Example 1.

[0079] Figure 4A and Figure 4B , is the CV of DMcT measured in AN electrolyte with the electrode not covered with PEDOT film and the electrode covered with PEDOT film, respectively. The measurement is carried out by changing the potential scanning range. exist Figure 4A , Figure 4B The CVs after potential sweeping in t...

Embodiment 3

[0083] by containing 0.1M LiClO 4 A measurement solution was prepared by adding DMcT to 2 mM NMP. As a working electrode, an enamel carbon disc electrode (3 mm in diameter) for a rotating electrode was used. By the same operation as in Example 2, a PEDOT-covered electrode was produced. The measurement was performed using a coiled platinum wire as a counter electrode and a silver ion electrode as a reference electrode. exist Figure 5 In , the current-potential curve corresponding to the oxidation reaction of DMcT from monomer to dimer in the PEDOT film-covered electrode and the uncovered electrode obtained at a rotational speed of 400 (rotation / minute) is shown. Figure 5 Curve (a) in , is the current-potential curve obtained with uncovered electrodes. It is observed that the limiting current increases with the increase of rotational speed. In addition, the half-wave potential is shifted towards the positive pole as the rotational speed increases. Figure 5 The curve (b)...

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Abstract

A redox active reversible electrode includes a conductive substrate and a redox active film formed on one surface of the conductive substrate. The redox active film contains a redox active sulfur-containing substance and a π-electron conjugated conductive polymer substance with p-type doping characteristics.

Description

technical field [0001] The invention relates to a redox active reversible electrode used in electrochemical elements such as batteries and capacitors, especially a redox active electrode with a redox active film capable of rapid electron and charge transfer reactions on a conductive substrate. In addition, the present invention also relates to a lithium secondary battery, a pseudo capacitor, and a pseudo secondary battery (herein referred to as a redox secondary battery) using such a redox active electrode. In particular, the present invention relates to a lithium secondary battery suitable for use as a power source of a mobile phone or an electric vehicle requiring high energy density, and a positive electrode used in the battery. The lithium secondary battery and the redox secondary battery of the present invention can also exhibit capacitor characteristics. Background technique [0002] Existing lithium secondary battery adopts lithium cobalt oxide (LiCoO 2 ), lithium n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/22H01G11/02H01G11/42H01G11/48H01M4/137H01M4/58H01M4/60H01M10/052H01M10/36
CPCH01G9/22H01G11/02H01G11/42H01G11/48H01M4/137H01M4/5815H01M4/60H01M4/606H01M10/052Y02T10/70Y02E60/10H01G9/042Y02E60/13
Inventor 小山升松川美由纪下村猛山口秀一郎
Owner 小山升
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