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Electrode for electromechanical battery, and electrochemical battery

An electrochemical and battery technology, applied in the field of electrochemical batteries, can solve the problems of battery performance degradation, cycle life reduction, etc., and achieve the effect of improving cycle life performance and high-speed charging/discharging performance

Inactive Publication Date: 2004-10-27
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the voltage applied to this unit cell may be higher than the voltage applied to another unit cell, which will lead to degradation of battery performance
Eventually, with heavy charge / discharge cycles, the difference in voltage profile between cells may become more pronounced, resulting in a significant decrease in cycle life

Method used

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  • Electrode for electromechanical battery, and electrochemical battery
  • Electrode for electromechanical battery, and electrochemical battery
  • Electrode for electromechanical battery, and electrochemical battery

Examples

Experimental program
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preparation example Construction

[0075] Although here the anion exchange resin is mixed with other electrode materials before coating, it is also possible to prepare an electrode by forming an anion exchange resin layer on the surface of the electrode. According to this process, the electrode preparation method includes the steps of: molding the mixture of electrode materials containing electrode active materials, conductive auxiliary materials, binders, etc., coating the slurry containing dispersed anion exchange resins on the moldings, and drying the coating. Cloth slurry; or a method comprising the steps of: putting a dry powdery electrode material mixture in a mold, adding a dry anion exchange resin on the surface of the mixture, and forming it by batch pressure molding.

[0076] The amount of the anion exchange resin relative to the electrode active material can preferably be appropriately selected within the above-mentioned limit range. For the electrode formed by dispersing the anion exchange resin in ...

Embodiment 1

[0118] 5-cyanindole trimer is used as the cathode active material, carbon fiber is used as the conductive auxiliary material, and PVDF (average molecular weight: 1100) is used as the binder, weighed sequentially with a weight ratio of 69 / 23 / 8, and the weight ratio of the cathode active material is 0.3 % by weight added to the anion exchange resin. The mixture is stirred and mixed with a mixer. The anion exchange resin is a fiber with a length of 3 mm obtained by cutting a fiber made of polyvinyl alcohol, which has trimethylammonium as an anion exchange group, wherein the ion type exchanged is -OH type, and its main axis 60 μm (Nitivy Co. Ltd., IEFSA (OH)).

[0119] Then, 10 mg of the mixed powder was weighed into 1 mL of DMF. The mixture was stirred at room temperature for 5 minutes to become a uniformly dispersed slurry. This slurry was applied to a current collector by screen printing and dried to form a cathode having a thickness of 100 µm, which was cut into a predeterm...

Embodiment 2

[0124] The cathode and anode material mixtures were prepared as described in Example 1. Electrochemical cells were then prepared as described in Example 1, except that each electrode was thermocompressed, and its high-temperature cycle performance was evaluated.

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Abstract

The present invention relates to an electrode for an electrochemical cell which comprises a cathode containing a proton-conducting compound as an electrode active material, an anode containing a proton-conducting compound as an electrode active material and an electrolyte containing a proton source, comprising a proton-conducting compound such as À-conjugated compounds or polymers having nitrogen atom, quinone compounds and quinone polymers, e.g. indole trimer, quinoxaline polymer and an anion-exchange resin. This invention can be used to improve cycle-life properties and high-speed charge / discharge properties in an electrochemical cell.

Description

technical field [0001] The present invention relates to an electrochemical cell for storage devices such as secondary batteries and electronic double layer capacitors and electrodes suitable for the same. Background technique [0002] Storage devices such as secondary batteries and capacitors in which proton-conducting polymers are used as electrode active materials have been proposed and actually used. figure 1 is a cross-sectional view illustrating a conventional electrochemical cell. [0003] Such as figure 1 As shown, in the structure of a conventional electrochemical cell, a cathode 3 is formed on a cathode current collector 1, and the cathode 3 contains, for example, a proton-conducting polymer as an electrode active material, while an anode 4 is formed on an anode current collector 2, and these electrodes pass through a separator 5 in which only protons act as charge carriers. In addition, this battery is filled with an aqueous solution or a non-aqueous solution co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/155H01M4/02H01M4/60H01M6/42H01M10/36
CPCH01M2300/0005H01M6/42Y02E60/122Y02E60/13H01M4/60H01M10/36H01M2300/0091H01G9/155H01M4/137Y02E60/10Y02P70/50H01G11/02H01G11/48H01G11/62B60J1/20E06B9/52B60J3/002E06B2009/524E06B2009/527
Inventor 信田知希纸透浩幸三谷胜哉金子志奈子吉成哲也西山利彦高桥直树
Owner TOKIN CORP
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