JPH07201664A - Electrolytic solution for driving electrolytic capacitors - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electrolytic capacitor in which the boehmite reaction of a cathode aluminum foil is suppressed without increasing the specific resistance and the reliability is improved. [Structure] A solvent consisting of ethylene glycol and water, succinic acid, adipic acid, azelaic acid, sebacic acid, 1,
6 Solute consisting of salts of organic carboxylic acids such as salts of 6-decanedicarboxylic acid, maleic acid and citraconic acid, and one or two of disaccharides such as maltose, lactose and cellobiose
It consists of at least one kind of additive, and this additive is 0.01 to 1
An electrolyte solution for driving an electrolytic capacitor, which is 0% by weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic solution for driving an electrolytic capacitor.

[0002]

2. Description of the Related Art Generally, an electrolytic solution having a low specific resistance value and stable characteristics over a wide temperature range is used as an electrolytic solution for driving an electrolytic capacitor. In an electrolytic solution containing ethylene glycol and water as a solvent and a salt of an organic carboxylic acid as a solute, the proportion of water is increased in order to reduce the resistance. Gas generation occurs due to the boehmite reaction of the cathode aluminum foil, and the explosion-proof valve operates, especially at high temperatures, resulting in low reliability.

[0003]

As described above, in the driving electrolyte solution using ethylene glycol and water as the solvent and the salt of the organic carboxylic acid as the solute, the gas due to the boehmite reaction that occurs in the cathode aluminum foil due to the presence of water. However, there is a drawback that gas is generated particularly at high temperatures, and a solution to this problem has been desired.

The present invention solves the above problems and suppresses gas generation due to the boehmite reaction of the cathode aluminum foil without increasing the specific resistance and improves the reliability of the electrolytic capacitor driving electrolytic solution. The purpose is to provide.

[0005]

An electrolytic solution for driving an electrolytic capacitor according to the present invention comprises a solvent consisting of ethylene glycol and water, a solute consisting of a salt of an organic carboxylic acid, and a disaccharide such as maltose, lactose or cerviose. 1 or 2
It consists of at least one kind of additive, and this additive is 0.01 to 1
It is composed of 0% by weight.

[0006]

According to the electrolytic capacitor-driving electrolytic solution configured as described above, one or two disaccharides such as maltose, lactose, and cellobiose can be used even if a large amount of water is contained to reduce the resistance. By adding at least one species, the boehmite reaction of the cathode aluminum foil can be suppressed without increasing the specific resistance. In particular, since it is effective in suppressing gas generation at high temperatures, stable performance can be obtained in a wide temperature range, and the reliability of the electrolytic capacitor can be significantly improved.

[0007]

EXAMPLES Examples of the present invention will be described below.

(Example A) As shown in Table 1 below, examples and comparative examples in which the addition ratio of maltose, which is one type of disaccharide, was changed to the driving electrolyte solution, and a conventional example in which no maltose was added. Was prepared, and the specific resistance and spark voltage at 25 ° C. of each electrolyte were measured.

[0009]

[Table 1]

As is clear from Table 1, in Examples 1 and 2, no increase in resistivity or decrease in spark voltage was observed.

Next, the examples shown in Table 1 above, comparative examples,
Capacitance, tan δ, initial characteristics of leakage current and characteristics after high temperature load test (105 ° C, 1000 hours), gas generation amount, valve operation number of an aluminum electrolytic capacitor manufactured by using a driving electrolytic solution of a conventional example Table 2 and Table 3 show the results of the investigation.

The samples are 10 electrolytic capacitors each rated at 250 V-47 μF.

[0013]

[Table 2]

[0014]

[Table 3]

As is clear from Tables 2 and 3, the difference between the initial values of Examples 1 and 2 and the conventional example is small, but in the conventional example after the high temperature load test, gas generation due to the boehmite reaction of the cathode aluminum foil. Because of this, all valves are operating.
Further, in Comparative Example 1 in which the added amount of maltose was as small as 0.005% by weight, the number of valves that could not suppress the gas generation after the high temperature load test was large and the added amount of maltose was as large as 15% by weight. In Comparative Example 2, the capacitance change rate and t
The value of an δ is large.

(Example B) In the above (Example A), the case where maltose was used as an additive was described.
In this (Example B), the case of using lactose will be described. A sample similar to (Example A) except that lactose was used as an additive was prepared and tested.

[0017]

[Table 4]

As is clear from Table 4, no increase in resistivity or decrease in spark voltage was observed in Examples 3 and 4.
Then, Examples 3 and 4 and Comparative Example 3 shown in Table 4 above.
Rated 250V-4 produced by using the driving electrolyte of No. 4
7 μF electrolytic capacitors, 10 capacitors each, similar to (Example A), initial characteristics of capacitance, tan δ, leakage current and characteristics after high temperature load test (105 ° C., 1000 hours), gas generation amount, number of valve operations Table 5 and Table 6
Shown in.

[0019]

[Table 5]

[0020]

[Table 6]

As is clear from Tables 5 and 6, in Comparative Example 3 in which the amount of lactose added was as small as 0.005% by weight, the number of valves that could not be operated after the high temperature load test could not be suppressed. In Comparative Example 4 in which the amount of added lactose is large and the amount of lactose added is large in 15% by weight, the rate of change in capacitance and the value of tan δ are large, and the results are almost the same as in Example A.

(Example C) Although the case where maltose was used as the additive in (Example A) and the case where lactose was used in (Example B) was described, the case where cellobiose was used in this (Example C) will be described. Samples similar to those of (Example A) and (Example B) except that cellobiose was used as the additive were prepared and tested.

[0023]

[Table 7]

As is clear from Table 7, no increase in the specific resistance and no decrease in the spark voltage were observed in Examples 5 and 6.
Then, Examples 5 and 6 and Comparative Example 5 shown in Table 7 above.
Rated 250V-4 produced by using the driving electrolyte of No. 6
7 μF electrolytic capacitors, 10 capacitors each, as in (Example A) and (Example B), initial characteristics of capacitance, tan δ, leakage current, and high temperature load test (105 ° C., 1000).
Tables 8 and 9 show the results of the investigation of the characteristics, the amount of gas generation, and the number of valve operations after (time).

[0025]

[Table 8]

[0026]

[Table 9]

As is clear from Tables 8 and 9, in Comparative Example 5 in which the addition amount of cellobiose was as small as 0.005% by weight, the number of valves operated without suppressing the gas generation after the high temperature load test. And the amount of cellobiose added is 15
In Comparative Example 6 with a large amount of weight%, the capacitance change rate and tan δ
Has a large value and shows almost the same results as in (Example A) and (Example B).

In the above examples, the case where ammonium sebacate was used as the solute was described, but succinic acid, adipic acid, azelaic acid, sebacic acid, 1,6
Similar effects can be obtained by using salts of decanedicarboxylic acid, maleic acid, and citraconic acid.

Further, the case where maltose, lactose, and cellobiose, which are disaccharides, were used alone as an additive has been described.
Similar effects can be obtained even if added in the range of 10 to 10% by weight, and other disaccharides such as trehalose, gentiobiose, isomaltose, and saccharose may be added alone or in combination of two or more in the same manner as the above disaccharides. Can also be used.

[0030]

As described above, according to the electrolytic solution for driving an electrolytic capacitor of the present invention, maltose, lactose, and cellobiose are used in which ethylene glycol and water are used as a solvent and an organic carboxylic acid salt is used as a solute. It is possible to decrease tan δ and ESR without increasing the specific resistance by adding one or more disaccharides such as In addition, since the boehmite reaction that occurs in the cathode aluminum foil can be suppressed, it is possible to provide an electrolytic capacitor having a long life by suppressing the gas generation. This suppression of gas generation has a remarkable effect of improving the life characteristics especially at high temperatures.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 9, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title of Invention Electrolytic solution for driving electrolytic capacitor

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic solution for driving an electrolytic capacitor.

[0002]

2. Description of the Related Art Generally, an electrolytic solution having a low specific resistance value and stable characteristics over a wide temperature range is used as an electrolytic solution for driving an electrolytic capacitor. In an electrolytic solution containing ethylene glycol and water as a solvent and a salt of an organic carboxylic acid as a solute, the proportion of water is increased in order to reduce the resistance. Gas generation occurs due to the boehmite reaction of the cathode aluminum foil, and the explosion-proof valve operates, especially at high temperatures, resulting in low reliability.

[0003]

As described above, in the driving electrolyte solution using ethylene glycol and water as the solvent and the salt of the organic carboxylic acid as the solute, the gas due to the boehmite reaction that occurs in the cathode aluminum foil due to the presence of water. However, there is a drawback that gas is generated particularly at high temperatures, and a solution to this problem has been desired.

The present invention solves the above problems and suppresses gas generation due to the boehmite reaction of the cathode aluminum foil without increasing the specific resistance and improves the reliability of the electrolytic capacitor driving electrolytic solution. The purpose is to provide.

[0005]

The electrolytic solution for driving an electrolytic capacitor according to the present invention comprises a solvent consisting of ethylene glycol and water, a solute consisting of a salt of an organic carboxylic acid, and a disaccharide such as maltose, lactose or cerviose. 1 or 2
It consists of at least one kind of additive, and this additive is 0.01 to 1
It is composed of 0% by weight.

[0006]

According to the electrolytic capacitor-driving electrolytic solution configured as described above, one or two disaccharides such as maltose, lactose, and cellobiose can be used even if a large amount of water is contained to reduce the resistance. 0.01 to 1 additive consisting of at least one species
By adding 0% by weight, the boehmite reaction of the cathode aluminum foil can be suppressed without increasing the specific resistance.
Especially effective in suppressing gas generation at high temperatures,
Stable performance can be obtained in a wide temperature range, and reliability of the electrolytic capacitor can be remarkably improved.

[0007]

EXAMPLES Examples of the present invention will be described below.

(Example A) As shown in Table 1 below, examples and comparative examples in which the addition ratio of maltose, which is one type of disaccharide, was changed to the driving electrolyte solution, and a conventional example in which no maltose was added. Was prepared, and the specific resistance and spark voltage at 25 ° C. of each electrolyte were measured.

[0009]

[Table 1]

As is clear from Table 1, in Examples 1 and 2, no increase in resistivity or decrease in spark voltage was observed.

Next, the examples shown in Table 1 above, comparative examples,
Capacitance, tan δ, initial characteristics of leakage current and characteristics after high temperature load test (105 ° C, 1000 hours), gas generation amount, valve operation number of an aluminum electrolytic capacitor manufactured by using a driving electrolytic solution of a conventional example Table 2 and Table 3 show the results of the investigation.

The samples are 10 electrolytic capacitors each rated at 250 V-47 μF.

[0013]

[Table 2]

[0014]

[Table 3]

As is clear from Tables 2 and 3, the difference between the initial values of Examples 1 and 2 and the conventional example is small, but in the conventional example after the high temperature load test, gas generation due to the boehmite reaction of the cathode aluminum foil. Because of this, all valves are operating.
Further, in Comparative Example 1 in which the added amount of maltose was as small as 0.005% by weight, the number of valves that could not suppress the gas generation after the high temperature load test was large and the added amount of maltose was as large as 15% by weight. In Comparative Example 2, the capacitance change rate and t
The value of an δ is large.

(Example B) In the above (Example A), the case where maltose was used as an additive was described.
In this (Example B), the case of using lactose will be described. A sample similar to (Example A) except that lactose was used as an additive was prepared and tested.

[0017]

[Table 4]

As is clear from Table 4, no increase in resistivity or decrease in spark voltage was observed in Examples 3 and 4.
Then, Examples 3 and 4 and Comparative Example 3 shown in Table 4 above.
Rated 250V-4 produced by using the driving electrolyte of No. 4
7 μF electrolytic capacitors, 10 capacitors each, similar to (Example A), initial characteristics of capacitance, tan δ, leakage current and characteristics after high temperature load test (105 ° C., 1000 hours), gas generation amount, number of valve operations Table 5 and Table 6
Shown in.

[0019]

[Table 5]

[0020]

[Table 6]

As is clear from Tables 5 and 6, in Comparative Example 3 in which the amount of lactose added was as small as 0.005% by weight, the number of valves that could not be operated after the high temperature load test could not be suppressed. In Comparative Example 4 in which the amount of added lactose is large and the amount of lactose added is large in 15% by weight, the rate of change in capacitance and the value of tan δ are large, and the results are almost the same as in Example A.

(Example C) Although the case where maltose was used as the additive in (Example A) and the case where lactose was used in (Example B) was described, the case where cellobiose was used in this (Example C) will be described. Samples similar to those of (Example A) and (Example B) except that cellobiose was used as the additive were prepared and tested.

[0023]

[Table 7]

As is clear from Table 7, no increase in the specific resistance and no decrease in the spark voltage were observed in Examples 5 and 6.
Then, Examples 5 and 6 and Comparative Example 5 shown in Table 7 above.
Rated 250V-4 produced by using the driving electrolyte of No. 6
7 μF electrolytic capacitors, 10 capacitors each, as in (Example A) and (Example B), initial characteristics of capacitance, tan δ, leakage current, and high temperature load test (105 ° C., 1000).
Tables 8 and 9 show the results of the investigation of the characteristics, the amount of gas generation, and the number of valve operations after (time).

[0025]

[Table 8]

[0026]

[Table 9]

As is clear from Tables 8 and 9, in Comparative Example 5 in which the addition amount of cellobiose was as small as 0.005% by weight, the number of valves operated without suppressing the gas generation after the high temperature load test. And the amount of cellobiose added is 15
In Comparative Example 6 with a large amount of weight%, the capacitance change rate and tan δ
Has a large value and shows almost the same results as in (Example A) and (Example B).

In the above examples, the case where ammonium sebacate was used as the solute was described, but succinic acid, adipic acid, azelaic acid, sebacic acid, 1,6
Similar effects can be obtained by using salts of decanedicarboxylic acid, maleic acid, and citraconic acid.

Further, the case where maltose, lactose, and cellobiose, which are disaccharides, were used alone as an additive has been described.
Similar effects can be obtained even if added in the range of 10% by weight, and other disaccharides such as trehalose, gentiobiose, isomaltose, and saccharose can be used alone or in combination of two or more in the same manner as the above disaccharides. 0.01-10 layers
It can be used even if added in an amount of% .

[0030]

As described above, according to the electrolytic solution for driving an electrolytic capacitor of the present invention, maltose, lactose, and cellobiose are used in which ethylene glycol and water are used as a solvent and an organic carboxylic acid salt is used as a solute. Addition of 0.01 to 10 layers of an additive consisting of one or more disaccharides such as
Addition of the amount of γ can reduce tan δ and ESR without increasing the specific resistance. In addition, since the boehmite reaction that occurs in the cathode aluminum foil can be suppressed, it is possible to provide an electrolytic capacitor having a long life by suppressing the gas generation. This suppression of gas generation has a remarkable effect of improving the life characteristics especially at high temperatures.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kiyoshi Sakamoto 1-1, Sachimachi, Nagai City, Yamagata Prefecture Marcon Electronics Co., Ltd. (72) Inventor, Kazuhiro Higuchi 1-1, Sachimachi, Nagai City, Yamagata Prefecture Marcon Electronics Co., Ltd. (72) Inventor Tetsuo Aoyama 182 Tayuhama Shinwari Niigata, Niigata Prefecture Mitsubishi Gas Chemical Co., Ltd. Niigata Research Center (72) Inventor Mayumi Haneda Tayuhama Shinwari 182 Niigata City, Niigata Mitsubishi Gas Chemical Co., Ltd. Niigata Research Center

Claims (1)

[Claims] 1. A solvent composed of ethylene glycol and water, a solute composed of a salt of an organic carboxylic acid, and one or more additives of a disaccharide.
An electrolytic solution for driving an electrolytic capacitor comprising 1 to 10% by weight.