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Electrolytic solution for electric double layer capacitor, electric double layer capacitor using the same, and manufacturing method therefor

A technology of electric double layer capacitors and manufacturing methods, applied in the direction of hybrid/electric double layer capacitor manufacturing, hybrid capacitor electrolytes, electrolytic capacitors, etc., can solve problems such as difficult long-term storage, use, polarizable electrodes or electrolyte degradation, etc., To achieve the effect of stable quality

Active Publication Date: 2012-03-14
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it cannot be said to be completely airtight, and moisture and the like are likely to invade into the interior along with moisture and the like, and the intruded moisture will cause deterioration of the polarizable electrode or electrolyte, so it is difficult to store and use for a long time

Method used

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  • Electrolytic solution for electric double layer capacitor, electric double layer capacitor using the same, and manufacturing method therefor
  • Electrolytic solution for electric double layer capacitor, electric double layer capacitor using the same, and manufacturing method therefor
  • Electrolytic solution for electric double layer capacitor, electric double layer capacitor using the same, and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0147] Mix sulfolane (in the table, described as SL): dimethyl sulfone (in the table, described as DMS) = 8: 2 (mass ratio) to obtain a non-aqueous solvent, and SBP-BF 4 Dissolve in the non-aqueous solvent as a supporting electrolyte so that the supporting electrolyte concentration is 1.5mol / dm 3 , so as to prepare the electrolyte.

[0148] Using the resulting electrolyte, make the following with figure 1 The electric double layer capacitor shown is the same as the electric double layer capacitor.

[0149] Commercially available activated carbon (specific surface area: 1900m 2 / g, pore volume: 0.85cm 3 / g, the proportion of tiny pores: 4%, the proportion of medium pores: 95%, the number average particle size: 12μm (measured by laser mode)) into a sheet with a thickness of 0.25mm ± 0.05mm, and cut it into 1.7 mm×1.0 mm sheet, the sheet was used as a positive electrode side electrode and a negative electrode side electrode. The negative electrode side electrode was bonded t...

Embodiment 1-2

[0157] Except that the water solvent is sulfolane:methylethylsulfone (EMS)=8:2 (mass ratio), an electric double layer capacitor was obtained by the same method as in Example 1-1, and the low-temperature capacity retention ratio was obtained.

Embodiment 2-1

[0165] except SBP-BF 4 The concentration is 1.0mol / dm 3 Otherwise, an electric double layer capacitor was obtained in the same manner as in Example 1-2. Ten obtained electric double layer capacitors were stored at 60° C. for 20 days after applying a voltage of 3.3 V in a 70° C. environment. In an environment of 24° C., the electric double layer capacitor was discharged to a voltage of 2.0 V at a constant current of 5 μA to obtain a discharge capacity, and the average value thereof was defined as the high-temperature capacity. The high-temperature capacity retention rate was calculated from the obtained high-temperature capacity and the separately obtained initial capacity by the following formula (III).

[0166] High temperature capacity maintenance rate (%) = high temperature capacity ÷ initial capacity × 100...(III)

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Abstract

Provided are an electrolytic solution for an electric double layer capacitor capable of providing an electric double layer capacitor having stable quality, an electric double layer capacitor using the electrolytic solution, and a manufacturing method for the electric double layer capacitor. The electrolytic solution includes a supporting electrolyte, sulfolane, and a linear sulfone. It is preferred that the electrolytic solution further include an organic fluorine compound. Further, it is preferred that the supporting electrolyte contain 5-azoniaspiro[4.4]nonane tetrafluoroborate, and the content of 5-azoniaspiro[4.4]nonane tetrafluoroborate be 1.5 to 3.6 mol / dm3.

Description

technical field [0001] The present invention relates to an electrolytic solution for an electric double layer capacitor, an electric double layer capacitor using the electrolytic solution, and a manufacturing method thereof. Background technique [0002] In a sealed storage container composed of a cover body and a container main body, an electric double layer capacitor is provided with a pair of polarizable electrodes, a separator sandwiched between the pair of polarizable electrodes, and an electrolytic solution. impregnated into the pair of polarizable electrodes and separator. In various small electronic products such as mobile phones, PDAs, and portable game machines, this type of electric double layer capacitor is used as a backup power source for memory or a backup power source for clock functions. Disc-shaped button type. [0003] A button-type electric double layer capacitor has a structure in which a lid is fitted into a container body to seal it. Therefore, it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/038H01G9/155H01G9/00H01G11/22H01G11/28H01G11/30H01G11/42H01G11/54H01G11/60H01G11/62H01G11/86
CPCH01G11/58Y02E60/13H01G11/26
Inventor 本望知浩佐藤凉及川智子玉地恒昭篠田勇渡边俊二
Owner SEIKO INSTR INC
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