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Electrochemical cell

An electrochemical and battery technology, applied in the field of electrochemical batteries, can solve the problems of rapid charge/discharge characteristics, degradation of cycle life characteristics, large interface resistance, etc.

Inactive Publication Date: 2005-04-27
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, there is a problem in the electrochemical cells of the prior art: electrochemical cells containing proton-conductive compounds as electrode active materials have a large interface resistance at the electrode active material / electrolyte interface, which makes rapid charge / discharge characteristics and cycle Deterioration of life characteristics

Method used

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Examples

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Embodiment 1

[0054] By adding 72% by weight of 5-cyanindole trimer represented by the following chemical formula as the positive electrode active material, 20% by weight of vapor-phase grown carbon as a conductive aid, and 8% by weight of polyvinylidene fluoride as a binder (average molecular weight: 1100) were combined, the mixture was stirred and mixed by a stirrer, and the mixture was molded into a given size by hot pressing to prepare a positive electrode layer 1 .

[0055]

[0056] By combining 75% by weight of polyphenylquinoxaline represented by the following chemical formula as a negative electrode active material and 25% by weight of vapor-phase grown carbon as a conductive aid, stirring and mixing the mixture by a stirrer, and passing the mixture by hot pressing Molded to a given size, the negative electrode layer 2 was prepared.

[0057]

[0058] The positive electrode layer and the negative electrode layer 1 and 2 impregnated with the electrolyte are oppositely arranged t...

Embodiment 2

[0067] An electrochemical cell was prepared in the same manner as in Example 1, except that 0.5% by weight of polyethylene glycol with an average molecular weight of 4,000 was added to the electrolytic solution as an electron transfer accelerator. The measurement results of its characteristics are shown in Table 1. It can be seen from Table 1 that compared with the electrochemical cell of Comparative Example 1, the capacity and cycle life of the electrochemical cell of Example 2 are increased by 7% and 25% respectively.

[0068] After charging under constant current / voltage (CCCV) 5C, 1.2V, 10 minutes and discharging to 0.8V at constant current (CC) at 20C, the battery was compared with the battery of Comparative Example 1 charged / discharged under the same conditions Compared with the residual capacity increased by 50%.

Embodiment 3

[0070] An electrochemical cell was prepared in the same manner as in Example 1, except that 0.5% by weight of polyethylene glycol with an average molecular weight of 20,000 was added to the electrolytic solution as an electron transfer promoter. The measurement results of its characteristics are shown in Table 1. It can be seen from Table 1 that compared with the electrochemical cell of Comparative Example 1, the capacity and cycle life of the electrochemical cell of Example 3 are increased by 8% and 20% respectively.

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Abstract

This invention relates to an electrochemical cell comprising 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 aqueous electrolytic solution containing a proton source as an electrolyte, wherein the electrolytic solution comprises a polymeric compound having an atom with an unpaired electron in its principal chain as an electron-transfer promoter. This invention can provide an electrochemical cell exhibiting improved capacity, high-speed charge / discharge properties and cycle properties.

Description

technical field [0001] The present invention relates to electrochemical cells, such as secondary batteries and electric double layer capacitors. Background technique [0002] Electrochemical cells (hereinafter simply referred to as "batteries"), such as secondary batteries and electric double layer capacitors, in which, for example, proton-conducting polymers are used as electrode active materials have been proposed and put into practical use. [0003] As shown in FIG. 1 , a conventional battery has a structure in which a positive electrode layer 1 containing, for example, a proton-conductive polymer as an electrode active material is formed on a positive electrode current collector 4a, and a negative electrode layer 2 is formed on a negative electrode current collector 4b, And the positive and negative electrode layers 1, 2 are combined via the separator 3 and have only protons as charge carriers. In addition, the battery is impregnated with an aqueous or non-aqueous solut...

Claims

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Application Information

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IPC IPC(8): H01G9/00H01G9/22H01G11/02H01M4/02H01M4/60H01M6/00H01M6/16H01M6/18H01M8/22H01M10/00H01M10/0565
CPCY02E60/12Y02E60/122Y02E60/13H01M6/181H01G9/155H01M10/0565H01M4/60H01G11/02H01M2300/0082H01G9/038H01M4/137H01G9/22H01M4/608Y02E60/10H01G11/64H01G11/62H01M10/38H01G9/035
Inventor 三谷胜哉信田知希纸透浩幸吉成哲也
Owner TOKIN CORP
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