JP2004165261A - Electrolytic solution for electrolytic capacitor and electrolytic capacitor using the same - Google Patents
Electrolytic solution for electrolytic capacitor and electrolytic capacitor using the same Download PDFInfo
- Publication number
- JP2004165261A JP2004165261A JP2002326721A JP2002326721A JP2004165261A JP 2004165261 A JP2004165261 A JP 2004165261A JP 2002326721 A JP2002326721 A JP 2002326721A JP 2002326721 A JP2002326721 A JP 2002326721A JP 2004165261 A JP2004165261 A JP 2004165261A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- electrolytic capacitor
- electrolytic
- salt
- electrolytic solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000003990 capacitor Substances 0.000 title claims abstract description 47
- 239000008151 electrolyte solution Substances 0.000 title claims abstract description 21
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 10
- 150000007524 organic acids Chemical class 0.000 claims abstract description 10
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- UYOMQIYKOOHAMK-UHFFFAOYSA-K aluminum hydron tetrafluoride Chemical compound [H+].[F-].[F-].[F-].[F-].[Al+3] UYOMQIYKOOHAMK-UHFFFAOYSA-K 0.000 claims abstract description 9
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 7
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims abstract description 6
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims abstract description 5
- 239000011976 maleic acid Substances 0.000 claims abstract description 5
- 239000003792 electrolyte Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 abstract 1
- 239000011888 foil Substances 0.000 description 15
- -1 imidazolinium cation Chemical class 0.000 description 12
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 9
- 150000001768 cations Chemical class 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
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- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 3
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- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 description 2
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- 150000003863 ammonium salts Chemical class 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 2
- 150000001923 cyclic compounds Chemical class 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 2
- MNWFXJYAOYHMED-UHFFFAOYSA-N heptanoic acid Chemical compound CCCCCCC(O)=O MNWFXJYAOYHMED-UHFFFAOYSA-N 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- ROBFUDYVXSDBQM-UHFFFAOYSA-N hydroxymalonic acid Chemical compound OC(=O)C(O)C(O)=O ROBFUDYVXSDBQM-UHFFFAOYSA-N 0.000 description 2
- MNUOZFHYBCRUOD-UHFFFAOYSA-N hydroxyphthalic acid Natural products OC(=O)C1=CC=CC(O)=C1C(O)=O MNUOZFHYBCRUOD-UHFFFAOYSA-N 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 2
- 239000003586 protic polar solvent Substances 0.000 description 2
- 229940070891 pyridium Drugs 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 2
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- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
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- HJSYENHCQNNLAS-UHFFFAOYSA-N 1,2,4-trimethyl-4,5-dihydroimidazole Chemical compound CC1CN(C)C(C)=N1 HJSYENHCQNNLAS-UHFFFAOYSA-N 0.000 description 1
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- QEIHVTKMBYEXPZ-UHFFFAOYSA-N 1,2-dimethyl-4,5-dihydroimidazole Chemical compound CN1CCN=C1C QEIHVTKMBYEXPZ-UHFFFAOYSA-N 0.000 description 1
- ZFDWWDZLRKHULH-UHFFFAOYSA-N 1,2-dimethyl-5,6-dihydro-4h-pyrimidine Chemical compound CN1CCCN=C1C ZFDWWDZLRKHULH-UHFFFAOYSA-N 0.000 description 1
- GIWQSPITLQVMSG-UHFFFAOYSA-N 1,2-dimethylimidazole Chemical compound CC1=NC=CN1C GIWQSPITLQVMSG-UHFFFAOYSA-N 0.000 description 1
- JJNFHWKVZWAKEB-UHFFFAOYSA-N 1,3,4-trimethylimidazolidin-2-one Chemical compound CC1CN(C)C(=O)N1C JJNFHWKVZWAKEB-UHFFFAOYSA-N 0.000 description 1
- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical compound CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 description 1
- NYCCIHSMVNRABA-UHFFFAOYSA-N 1,3-diethylimidazolidin-2-one Chemical compound CCN1CCN(CC)C1=O NYCCIHSMVNRABA-UHFFFAOYSA-N 0.000 description 1
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- VMZNMSUASLBPDS-UHFFFAOYSA-N 1-ethyl-2-methyl-4,5-dihydroimidazole Chemical compound CCN1CCN=C1C VMZNMSUASLBPDS-UHFFFAOYSA-N 0.000 description 1
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- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 1
- HQPMKSGTIOYHJT-UHFFFAOYSA-N ethane-1,2-diol;propane-1,2-diol Chemical compound OCCO.CC(O)CO HQPMKSGTIOYHJT-UHFFFAOYSA-N 0.000 description 1
- LIWAQLJGPBVORC-UHFFFAOYSA-N ethylmethylamine Chemical compound CCNC LIWAQLJGPBVORC-UHFFFAOYSA-N 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 description 1
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- AJFDBNQQDYLMJN-UHFFFAOYSA-N n,n-diethylacetamide Chemical compound CCN(CC)C(C)=O AJFDBNQQDYLMJN-UHFFFAOYSA-N 0.000 description 1
- KERBAAIBDHEFDD-UHFFFAOYSA-N n-ethylformamide Chemical compound CCNC=O KERBAAIBDHEFDD-UHFFFAOYSA-N 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- ZWLPBLYKEWSWPD-UHFFFAOYSA-N o-toluic acid Chemical compound CC1=CC=CC=C1C(O)=O ZWLPBLYKEWSWPD-UHFFFAOYSA-N 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 125000005429 oxyalkyl group Chemical group 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 125000005207 tetraalkylammonium group Chemical group 0.000 description 1
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- OSBSFAARYOCBHB-UHFFFAOYSA-N tetrapropylammonium Chemical compound CCC[N+](CCC)(CCC)CCC OSBSFAARYOCBHB-UHFFFAOYSA-N 0.000 description 1
- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 description 1
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 1
- SEACXNRNJAXIBM-UHFFFAOYSA-N triethyl(methyl)azanium Chemical compound CC[N+](C)(CC)CC SEACXNRNJAXIBM-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
【課題】低インピーダンス特性を有し、さらに１００Ｖ級の高耐電圧特性を有し、耐湿性、高温寿命特性も良好な電解コンデンサ用電解液およびそれを用いた電解コンデンサを提供する。
【解決手段】四弗化アルミニウム塩、および溶質全体の３０ｗｔ％未満のフタル酸、マレイン酸、ボロジサリチル酸等の有機酸またはその塩からなる溶質を含有する電解コンデンサ用電解液を用いているので、低インピーダンス特性、高耐電圧特性を有し、高温寿命特性、耐湿特性も良好な電解コンデンサを提供することができる。
【選択図】 なしProvided is an electrolytic solution for an electrolytic capacitor having low impedance characteristics, high withstand voltage characteristics of a 100 V class, and excellent moisture resistance and high-temperature life characteristics, and an electrolytic capacitor using the same.
The electrolyte for an electrolytic capacitor contains an aluminum tetrafluoride salt and a solute composed of an organic acid such as phthalic acid, maleic acid, and borodisalicylic acid or a salt thereof in an amount of less than 30% by weight of the entire solute. An electrolytic capacitor having low impedance characteristics, high withstand voltage characteristics, and good high-temperature life characteristics and moisture resistance characteristics can be provided.
[Selection diagram] None
Description
【０００１】
【産業上の利用分野】
この発明は電解コンデンサ用電解コンデンサおよびそれを用いた電解コンデンサ、特に低インピーダンス特性、および高耐電圧特性を有する電解コンデンサ用電解液およびそれを用いた電解コンデンサに関する。
【０００２】
【従来の技術】
電解コンデンサは、一般的には帯状の高純度のアルミニウム箔に、化学的あるいは電気化学的にエッチング処理を施して、アルミニウム箔表面を拡大させるとともに、このアルミニウム箔をホウ酸アンモニウム水溶液等の化成液中にて化成処理して表面に酸化皮膜層を形成させた陽極電極箔と、エッチング処理のみを施した高純度のアルミニウム箔からなる陰極電極箔とを、マニラ紙等からなるセパレータを介して巻回してコンデンサ素子を形成する。そして、このコンデンサ素子は、電解コンデンサ駆動用の電解液を含浸した後、アルミニウム等からなる有底筒状の外装ケースに収納する。外装ケースの開口部には弾性ゴムからなる封口体を装着し、絞り加工により外装ケースを密封している。
【０００３】
ここで、コンデンサ素子に含浸される高電導率を有する電解コンデンサ駆動用の電解液として、γ−ブチロラクトンを主溶媒とし、溶質として環状アミジン化合物を四級化したカチオンであるイミダゾリニウムカチオンやイミダゾリウムカチオンを、カチオン成分とし、酸の共役塩基をアニオン成分とした塩を溶解させたものが用いられている（特許文献１及び特許文献２参照）。
【０００４】
【特許文献１】
特開平０８−３２１４４０号公報
【特許文献２】
特開平０８−３２１４４１号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、近年、電子情報機器はデジタル化され、さらにこれらの電子情報機器の心臓部であるマイクロプロセッサの駆動周波数の高速化がすすんでいる。これに伴って、周辺回路の電子部品の消費電力の増大化が進み、それに伴うリップル電流の増大化が著しく、この回路に用いる電解コンデンサには、低インピーダンス特性が要求される。
【０００６】
また、特に車載の分野では、自動車性能の高機能化に伴って、前述の低インピーダンス特性に対する要求が高い。ところで、車載用回路の駆動電圧は１４Ｖであるが、消費電力の増大にともなって４２Ｖへと進展しつつあり、このような駆動電圧に対応するには電解コンデンサの耐電圧特性は２８Ｖ、８４Ｖ以上が必要である。さらに、この分野では高温使用の要求があり、電解コンデンサには高温寿命特性が要求される。
【０００７】
ところが、前記の電解コンデンサ用電解液では、このような低インピーダンス特性に対応することができず、また、耐電圧も３０Ｖが限界で、２８Ｖには対応できるものも、８４Ｖ以上というような高耐電圧の要求には答えることができなかった。また、このような電解コンデンサにも半導体と同様の耐湿性が求められるようになっているが、前記の電解コンデンサは耐湿特性も低いという問題点があった。
【０００８】
そこで、本発明は、低インピーダンス特性を有し、さらに１００Ｖ級の高耐電圧特性を有し、高温寿命特性、耐湿特性も良好な電解コンデンサ用電解液およびそれを用いた電解コンデンサを提供することを目的とする。
【０００９】
【課題を解決しようとする手段】
本発明の電解コンデンサ用電解液は、四弗化アルミニウム塩および、溶質全体の３０ｗｔ％未満の有機酸またはその塩からなる溶質を含有することを特徴としている。
【００１０】
また、前記有機酸として、フタル酸、マレイン酸、ボロジサリチル酸を用いたことを特徴としている。
【００１１】
そして、本発明の電解コンデンサは、前記の電解コンデンサ用電解液を用いたことを特徴としている。
【００１２】
【発明の実施の形態】
本発明の電解コンデンサ用電解液は、四弗化アルミニウム塩および、溶質全体の３０ｗｔ％未満の有機酸またはその塩からなる溶質を含有しているが、火花電圧が高く、低比抵抗特性を有している。そして、高温安定性、耐湿特性も良好である。
【００１３】
四弗化アルミニウム塩は四弗化アルミニウムをアニオン成分とする塩であるが、この塩としてはアンモニウム塩、アミン塩、４級アンモニウム塩、または四級化環状アミジニウムイオンをカチオン成分とする塩を用いることができる。アミン塩を構成するアミンとしては、一級アミン（メチルアミン、エチルアミン、プロピルアミン、ブチルアミン、エチレンジアミン、モノエタノールアミン等）、二級アミン（ジメチルアミン、ジエチルアミン、ジプロピルアミン、エチルメチルアミン、ジフェニルアミン、ジエタノールアミン等）、三級アミン（トリメチルアミン、トリエチルアミン、トリブチルアミン、１，８−ジアザビシクロ（５，４，０）−ウンデセン−７、トリエタノールアミン等）があげられる。また、第４級アンモニウム塩を構成する第４級アンモニウムとしてはテトラアルキルアンモニウム（テトラメチルアンモニウム、テトラエチルアンモニウム、テトラプロピルアンモニウム、テトラブチルアンモニウム、メチルトリエチルアンモニウム、ジメチルジエチルアンモニウム等）、ピリジウム（１−メチルピリジウム、１−エチルピリジウム、１，３−ジエチルピリジウム等）が挙げられる。
【００１４】
さらに、四級化環状アミジニウムイオンをカチオン成分とする塩においては、カチオン成分となる四級化環状アミジニウムイオンは、Ｎ，Ｎ，Ｎ’−置換アミジン基をもつ環状化合物を四級化したカチオンであり、Ｎ，Ｎ，Ｎ’−置換アミジン基をもつ環状化合物としては、以下の化合物が挙げられる。イミダゾール単環化合物（１−メチルイミダゾール、１−フェニルイミダゾール、１，２−ジメチルイミダゾール、１−エチル−２−メチルイミダゾール、２−エチル−１−メチルイミダゾール、１，２−ジエチルイミダゾール、１，２，４−トリメチルイミダゾール等のイミダゾール同族体、１−メチル−２−オキシメチルイミダゾール、１−メチル−２−オキシエチルイミダゾール等のオキシアルキル誘導体、１−メチル−４（５）−ニトロイミダゾール等のニトロ誘導体、１，２−ジメチル−５（４）−アミノイミダゾール等のアミノ誘導体等）、ベンゾイミダゾール化合物（１−メチルベンゾイミダゾール、１−メチル−２−ベンジルベンゾイミダゾール、１−メチル−５（６）−ニトロベンゾイミダゾール等）、２−イミダゾリン環を有する化合物（１−メチルイミダゾリン、１，２−ジメチルイミダゾリン、１，２，４−トリメチルイミダゾリン、１−メチル−２−フェニルイミダゾリン、１−エチル−２−メチルイミダゾリン、１，４−ジメチル−２−エチルイミダゾリン、１−メチル−２−エトキシメチルイミダゾリン等）、テトラヒドロピリミジン環を有する化合物（１−メチル−１，４，５，６−テトラヒドロピリミジン、１，２−ジメチル−１，４，５，６−テトラヒドロピリミジン、１，５−ジアザビシクロ〔４，３，０〕ノネン−５等）等である。
【００１５】
そして、本発明に用いられる有機酸としては、以下の酸を挙げることができる。すなわち、ギ酸、酢酸、プロピオン酸、酪酸、エナント酸等のモノカルボン酸、蓚酸、マロン酸、コハク酸、グルタル酸、アジピン酸、アゼライン酸、セバシン酸、デカンジカルボン酸、オクタンジカルボン酸、マレイン酸、フマル酸、シトラコン酸、イタコン酸等のジカルボン酸、安息香酸、トルイル酸、フタル酸、イソフタル酸、テレフタル酸等の芳香族カルボン酸、グリコール酸、乳酸、２−ヒドロキシ酪酸、サリチル酸、ヒドロキシマロン酸、リンゴ酸、α−メチルリンゴ酸、酒石酸、クエン酸、γ−レゾルシル酸、β−レゾルシル酸、ヒドロキシフタル酸、ジヒドロキシフタル酸等のヒドロキシカルボン酸、ボロジサリチル酸等の有機酸の錯化合物等である。これらの中でフタル酸、マレイン酸、ボロジサリチル酸が好ましい。
【００１６】
これらの塩としては、前述のアンモニウム塩、アミン塩、４級アンモニウム塩、または四級化環状アミジニウムイオンをカチオン成分とする塩を用いることができる。
【００１７】
そして、本発明の電解コンデンサ用電解液は、四弗化アルミニウム塩および、溶質全体の３０ｗｔ％未満の有機酸またはその塩からなる溶質を含有するものであるが、有機酸またはその塩の溶質全体の含有量は、好ましくは５〜２５ｗｔ％、さらに好ましくは１０〜２５ｗｔ％である。この範囲外では耐湿特性が低下する。
【００１８】
本発明の電解液に用いる溶媒としては、プロトン性極性溶媒、非プロトン性溶媒、及びこれらの混合物を用いることができる。プロトン性極性溶媒としては、一価アルコール類（エタノール、プロパノール、ブタノール、ペンタノール、ヘキサノール、シクロブタノール、シクロペンタノール、シクロヘキサノール、ベンジルアルコール等）、多価アルコール類およびオキシアルコール化合物類（エチレングリコール、プロピレングリコール、グリセリン、メチルセロソルブ、エチルセロソルブ、メトキシプロピレングリコール、ジメトキシプロパノール等）などが挙げられる。また、非プロトン性の極性溶媒としては、アミド系（Ｎ−メチルホルムアミド、Ｎ，Ｎ─ジメチルホルムアミド、Ｎ─エチルホルムアミド、Ｎ，Ｎ─ジエチルホルムアミド、Ｎ─メチルアセトアミド、Ｎ，Ｎ─ジメチルアセトアミド、Ｎ─エチルアセトアミド、Ｎ，Ｎ−ジエチルアセトアミド、ヘキサメチルホスホリックアミド等）、ラクトン類（γ−ブチロラクトン、δ−バレロラクトン、γ−バレロラクトン等）、スルホラン系（スルホラン、３−メチルスルホラン、２，４−ジメチルスルホラン等）、環状アミド系（Ｎ─メチル─２─ピロリドン等）、カーボネイト類（エチレンカーボネイト、プロピレンカーボネイト、イソブチレンカーボネイト等）、ニトリル系（アセトニトリル等）、スルホキシド系（ジメチルスルホキシド等）、２−イミダゾリジノン系〔１，３−ジアルキル−２−イミダゾリジノン（１，３−ジメチル−２−イミダゾリジノン、１，３−ジエチル−２−イミダゾリジノン、１，３−ジ（ｎ−プロピル）−２−イミダゾリジノン等）、１，３，４−トリアルキル−２−イミダゾリジノン（１，３，４−トリメチル−２−イミダゾリジノン等）〕などが代表として、挙げられる。なかでも、γ−ブチロラクトンを用いるとインピーダンス特性が向上するので好ましく、スルホラン、３−メチルスルホラン、２，４−ジメチルスルホランを用いると高温特性が向上するので好ましく、エチレングリコールを用いると耐電圧特性が向上するので好ましい。
【００１９】
以上の本発明の電解コンデンサ用電解液は、低比抵抗特性を有し、火花電圧も高く、高温安定性も良好なので、この電解コンデンサ用電解液を用いた電解コンデンサは、低インピーダンス特性および１００Ｖ級の高耐電圧特性を有し、高温寿命特性、さらに耐湿特性も良好である。すなわち、四弗化アルミニウム塩を用い、耐湿試験を行った場合、封口部から浸透した水分によって、電解液と電極箔との反応性が大きくなって特性に影響を与えるが、本発明の電解液においては、このような場合にも安定した特性を得ることができる。
【００２０】
【実施例】
次にこの発明について実施例を示して説明する。コンデンサ素子は陽極電極箔と陰極電極箔をセパレータを介して巻回して形成する。また陽極電極箔、陰極電極箔には陽極引出し用のリード線、陰極引出し用のリード線がそれぞれ接続されている。
【００２１】
これらのリード線は、電極箔に当接する接続部とこの接続部と一体に形成した丸棒部、および丸棒部の先端に固着した外部接続部からなる。また、接続部および丸棒部は９９％のアルミニウム、外部接続部は銅メッキ鉄鋼線（以下ＣＰ線という）からなる。このリード線の、少なくとも丸棒部の表面には、リン酸アンモニウム水溶液による化成処理により酸化アルミニウムからなる陽極酸化皮膜が形成されている。このリード線は、接続部においてそれぞれステッチや超音波溶接等の手段により両極電極箔に電気的に接続されている。
【００２２】
陽極電極箔は、純度９９．９％のアルミニウム箔を酸性溶液中で化学的あるいは電気化学的にエッチングして拡面処理した後、アジピン酸アンモニウムの水溶液中で化成処理を行い、その表面に陽極酸化皮膜層を形成したものを用いる。
【００２３】
そして、電解液を含浸したコンデンサ素子を、有底筒状のアルミニウムよりなる外装ケースに収納し、外装ケースの開口部に封口体を装着するとともに、外装ケースの端部に絞り加工を施して外装ケースを密封する。封口体は、リード線をそれぞれ導出する貫通孔を備えている。
【００２４】
ここで用いた電解コンデンサ用電解液を（表１）に示す。
【００２５】
以上のように構成した電解コンデンサの定格は、６．３ＷＶ−８２０μＦであり、これらの電解コンデンサの特性を評価した。試験条件は１０５℃、５００時間負荷である。その結果を（表２）に示す。また、耐湿特性を評価した。試験条件は、８５℃、８５％ＲＨ、５００時間無負荷である。その結果を（表３）に示す。
【００２６】
【表１】
Ａ：四弗化アルミン酸１−エチル−２，３−ジメチルイミダゾリニウム
Ｂ：フタル酸水素１−エチル−２，３−ジメチルイミダゾリニウム
【００２７】
【表２】
【００２８】
【表３】
（表１）から明らかなように、実施例の電解コンデンサ用電解液の火花電圧は従来例に比べて高く、比抵抗も低い。そして、（表２）から分かるように、これを用いた電解コンデンサのｔａｎδは低く、高温寿命特性も良好である。さらに、（表３）から分かるように、耐湿試験後の漏れ電流は比較例では初期値の３倍になっているが、実施例は１．７倍以下となっており、本発明の効果が明らかである。また、火花電圧から分かるように１００Ｖ級の電解コンデンサが可能であり、高温寿命特性、耐湿特性が良好であることが確認されている。
【００２９】
【発明の効果】
この発明によれば、四弗化アルミニウム塩、および溶質全体の３０ｗｔ％未満の有機酸またはその塩からなる溶質を含有する電解コンデンサ用電解液を用いているので、低インピーダンス特性、高耐電圧特性を有し、高温寿命特性、耐湿特性も良好な電解コンデンサを提供することができる。[0001]
[Industrial applications]
The present invention relates to an electrolytic capacitor for an electrolytic capacitor and an electrolytic capacitor using the same, and more particularly to an electrolytic solution for an electrolytic capacitor having low impedance characteristics and high withstand voltage characteristics and an electrolytic capacitor using the same.
[0002]
[Prior art]
In general, electrolytic capacitors are chemically or electrochemically etched on a strip of high-purity aluminum foil to enlarge the surface of the aluminum foil, and the aluminum foil is treated with a chemical solution such as an aqueous solution of ammonium borate. An anode electrode foil formed on the surface by forming an oxide film layer by a chemical conversion treatment, and a cathode electrode foil made of a high-purity aluminum foil subjected to only an etching treatment are wound through a separator made of manila paper or the like. Turn to form a capacitor element. Then, the capacitor element is impregnated with an electrolytic solution for driving an electrolytic capacitor, and then stored in a bottomed cylindrical outer case made of aluminum or the like. A sealing body made of elastic rubber is attached to the opening of the outer case, and the outer case is sealed by drawing.
[0003]
Here, as an electrolytic solution for driving an electrolytic capacitor having a high electrical conductivity impregnated in a capacitor element, γ-butyrolactone is used as a main solvent, and imidazolinium cation and imidazonium cation, which are cations obtained by quaternizing a cyclic amidine compound as a solute, are used. What melt | dissolved the salt which used the cation component as the cation component and the conjugate base of the acid as the anion component is used (refer patent document 1 and patent document 2).
[0004]
[Patent Document 1]
JP 08-32440 A [Patent Document 2]
JP 08-32441 A [0005]
[Problems to be solved by the invention]
However, in recent years, electronic information devices have been digitized, and the driving frequency of a microprocessor, which is the heart of these electronic information devices, has been increasing. Along with this, the power consumption of electronic components in peripheral circuits has been increasing, and the ripple current has been significantly increased accordingly, so that electrolytic capacitors used in this circuit are required to have low impedance characteristics.
[0006]
In particular, in the field of in-vehicle use, there is a high demand for the above-described low-impedance characteristic as the performance of automobiles increases. By the way, the driving voltage of the on-vehicle circuit is 14 V, but it is progressing to 42 V with an increase in power consumption. In order to cope with such a driving voltage, the withstand voltage characteristic of the electrolytic capacitor is 28 V, 84 V or more. is necessary. Further, there is a demand for high temperature use in this field, and high temperature life characteristics are required for electrolytic capacitors.
[0007]
However, the electrolytic solution for an electrolytic capacitor cannot cope with such a low impedance characteristic, and the withstand voltage is limited to 30 V, and the withstand voltage of 28 V is not enough, and a withstand voltage as high as 84 V or more is required. I couldn't answer the voltage demand. Further, such electrolytic capacitors are required to have the same moisture resistance as semiconductors, but there is a problem that the electrolytic capacitors have low moisture resistance.
[0008]
Therefore, the present invention provides an electrolytic solution for an electrolytic capacitor having low impedance characteristics, high withstand voltage characteristics of 100V class, high-temperature life characteristics and good moisture resistance characteristics, and an electrolytic capacitor using the same. With the goal.
[0009]
[Means to solve the problem]
The electrolytic solution for an electrolytic capacitor of the present invention is characterized by containing an aluminum tetrafluoride salt and a solute composed of an organic acid or a salt thereof in an amount of less than 30% by weight of the entire solute.
[0010]
Further, phthalic acid, maleic acid, and borodisalicylic acid are used as the organic acid.
[0011]
And the electrolytic capacitor of the present invention is characterized by using the electrolytic solution for an electrolytic capacitor described above.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The electrolytic solution for an electrolytic capacitor of the present invention contains an aluminum tetrafluoride salt and a solute composed of an organic acid or a salt thereof in an amount of less than 30% by weight of the entire solute, but has a high spark voltage and low resistivity. are doing. In addition, high-temperature stability and moisture resistance are also good.
[0013]
The aluminum tetrafluoride salt is a salt containing aluminum tetrafluoride as an anion component. Examples of the salt include an ammonium salt, an amine salt, a quaternary ammonium salt, and a salt containing a quaternized cyclic amidinium ion as a cation component. Can be used. Examples of the amine constituting the amine salt include primary amines (methylamine, ethylamine, propylamine, butylamine, ethylenediamine, monoethanolamine, etc.), and secondary amines (dimethylamine, diethylamine, dipropylamine, ethylmethylamine, diphenylamine, diethanolamine). Tertiary amines (trimethylamine, triethylamine, tributylamine, 1,8-diazabicyclo (5,4,0) -undecene-7, triethanolamine, etc.). The quaternary ammonium constituting the quaternary ammonium salt includes tetraalkylammonium (tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, methyltriethylammonium, dimethyldiethylammonium, etc.), pyridium (1-methylammonium). Pyridium, 1-ethylpyridium, 1,3-diethylpyridium, etc.).
[0014]
Further, in a salt containing a quaternized cyclic amidinium ion as a cation component, the quaternized cyclic amidinium ion serving as a cation component is obtained by quaternizing a cyclic compound having an N, N, N′-substituted amidine group. As the cyclic compound which is a cation and has an N, N, N'-substituted amidine group, the following compounds may be mentioned. Imidazole monocyclic compounds (1-methylimidazole, 1-phenylimidazole, 1,2-dimethylimidazole, 1-ethyl-2-methylimidazole, 2-ethyl-1-methylimidazole, 1,2-diethylimidazole, 1,2 Homologs such as 1,4-trimethylimidazole, oxyalkyl derivatives such as 1-methyl-2-oxymethylimidazole and 1-methyl-2-oxyethylimidazole, and nitro such as 1-methyl-4 (5) -nitroimidazole Derivatives, amino derivatives such as 1,2-dimethyl-5 (4) -aminoimidazole, etc.), and benzimidazole compounds (1-methylbenzimidazole, 1-methyl-2-benzylbenzimidazole, 1-methyl-5 (6) -Nitrobenzimidazole, etc.), 2-imidazoline (1-methylimidazoline, 1,2-dimethylimidazoline, 1,2,4-trimethylimidazoline, 1-methyl-2-phenylimidazoline, 1-ethyl-2-methylimidazoline, 1,4-dimethyl-2 -Ethylimidazoline, 1-methyl-2-ethoxymethylimidazoline, etc.) and compounds having a tetrahydropyrimidine ring (1-methyl-1,4,5,6-tetrahydropyrimidine, 1,2-dimethyl-1,4,5, 6-tetrahydropyrimidine, 1,5-diazabicyclo [4,3,0] nonene-5, and the like.
[0015]
And the following acids can be mentioned as an organic acid used for this invention. That is, formic acid, acetic acid, propionic acid, butyric acid, monocarboxylic acids such as enanthic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, octanedicarboxylic acid, maleic acid, Fumaric acid, citraconic acid, dicarboxylic acids such as itaconic acid, benzoic acid, toluic acid, phthalic acid, isophthalic acid, aromatic carboxylic acids such as terephthalic acid, glycolic acid, lactic acid, 2-hydroxybutyric acid, salicylic acid, hydroxymalonic acid, Complex compounds of organic acids such as malic acid, α-methylmalic acid, tartaric acid, citric acid, γ-resorcylic acid, β-resorsilic acid, hydroxyphthalic acid, dihydroxyphthalic acid, and hydroxycarboxylic acids, and borodisalicylic acid. . Of these, phthalic acid, maleic acid and borodisalicylic acid are preferred.
[0016]
As these salts, the above-mentioned ammonium salts, amine salts, quaternary ammonium salts, or salts having a quaternized cyclic amidinium ion as a cation component can be used.
[0017]
The electrolytic solution for an electrolytic capacitor of the present invention contains an aluminum tetrafluoride salt and a solute composed of an organic acid or a salt thereof in an amount of less than 30% by weight of the entire solute. Is preferably 5 to 25 wt%, more preferably 10 to 25 wt%. Outside this range, the moisture resistance is reduced.
[0018]
As the solvent used for the electrolytic solution of the present invention, a protic polar solvent, an aprotic solvent, and a mixture thereof can be used. Examples of protic polar solvents include monohydric alcohols (ethanol, propanol, butanol, pentanol, hexanol, cyclobutanol, cyclopentanol, cyclohexanol, benzyl alcohol, etc.), polyhydric alcohols and oxyalcohol compounds (ethylene glycol Propylene glycol, glycerin, methyl cellosolve, ethyl cellosolve, methoxypropylene glycol, dimethoxypropanol, etc.). Examples of the aprotic polar solvent include amides (N-methylformamide, N, N─dimethylformamide, N─ethylformamide, N, N─diethylformamide, N─methylacetamide, N, N─dimethylacetamide, N─ethylacetamide, N, N-diethylacetamide, hexamethylphosphoramide, etc.), lactones (γ-butyrolactone, δ-valerolactone, γ-valerolactone, etc.), sulfolane (sulfolane, 3-methylsulfolane, , 4-dimethylsulfolane, etc.), cyclic amides (N-methyl-2-pyrrolidone, etc.), carbonates (ethylene carbonate, propylene carbonate, isobutylene carbonate, etc.), nitriles (acetonitrile, etc.), sulfoxides (dimethylsulfoxide, etc.) , -Imidazolidinone type [1,3-dialkyl-2-imidazolidinone (1,3-dimethyl-2-imidazolidinone, 1,3-diethyl-2-imidazolidinone, 1,3-di (n- Propyl) -2-imidazolidinone, and 1,3,4-trialkyl-2-imidazolidinone (1,3,4-trimethyl-2-imidazolidinone) and the like. Among them, the use of γ-butyrolactone is preferable because the impedance characteristics are improved, and the use of sulfolane, 3-methylsulfolane, and 2,4-dimethylsulfolane is preferable because the high-temperature characteristics are improved, and the withstand voltage characteristics are preferable when ethylene glycol is used. It is preferable because it improves.
[0019]
The electrolytic solution for an electrolytic capacitor of the present invention has a low specific resistance characteristic, a high spark voltage, and a good high-temperature stability. Therefore, an electrolytic capacitor using the electrolytic solution for an electrolytic capacitor has low impedance characteristics and 100 V It has high-grade withstand voltage characteristics, high-temperature life characteristics, and good moisture resistance characteristics. That is, when a moisture resistance test is performed using aluminum tetrafluoride, the reactivity between the electrolyte and the electrode foil increases due to the moisture permeating from the sealing portion, which affects the characteristics. In this case, stable characteristics can be obtained even in such a case.
[0020]
【Example】
Next, the present invention will be described with reference to examples. The capacitor element is formed by winding an anode electrode foil and a cathode electrode foil via a separator. Further, a lead wire for leading the anode and a lead wire for leading the cathode are connected to the anode electrode foil and the cathode electrode foil, respectively.
[0021]
These lead wires are composed of a connecting portion that comes into contact with the electrode foil, a round bar formed integrally with the connecting portion, and an external connecting portion fixed to the tip of the round bar. The connecting portion and the round bar portion are made of 99% aluminum, and the external connecting portion is made of a copper-plated steel wire (hereinafter referred to as a CP wire). An anodic oxide film made of aluminum oxide is formed on at least the surface of the round bar portion of the lead wire by a chemical conversion treatment with an ammonium phosphate aqueous solution. The lead wires are electrically connected to the bipolar electrode foils at the connection portions by means such as stitching or ultrasonic welding.
[0022]
The anode electrode foil is obtained by chemically or electrochemically etching an aluminum foil having a purity of 99.9% in an acidic solution and expanding the surface thereof, and then performing a chemical conversion treatment in an aqueous solution of ammonium adipate. Use an oxide film layer.
[0023]
Then, the capacitor element impregnated with the electrolytic solution is housed in an outer case made of aluminum with a cylindrical shape with a bottom, a sealing body is attached to an opening of the outer case, and a drawing process is performed on an end of the outer case. Seal the case. The sealing body is provided with through holes for respectively leading out the lead wires.
[0024]
The electrolytic solution for electrolytic capacitors used here is shown in (Table 1).
[0025]
The rating of the electrolytic capacitors configured as described above was 6.3 WV-820 μF, and the characteristics of these electrolytic capacitors were evaluated. The test conditions were 105 ° C. and 500 hours load. The results are shown in (Table 2). In addition, the moisture resistance was evaluated. The test conditions are 85 ° C., 85% RH, and no load for 500 hours. The results are shown in (Table 3).
[0026]
[Table 1]
[Table 2]
[Table 3]
[0029]
【The invention's effect】
According to the present invention, since the electrolytic solution for an electrolytic capacitor containing an aluminum tetrafluoride salt and a solute composed of an organic acid or less than 30 wt% of the total solute is used, low impedance characteristics and high withstand voltage characteristics are used. And an electrolytic capacitor having good high-temperature life characteristics and good moisture resistance characteristics can be provided.
Claims (3)
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|---|---|---|---|
| JP2002326721A JP2004165261A (en) | 2002-11-11 | 2002-11-11 | Electrolytic solution for electrolytic capacitor and electrolytic capacitor using the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006012984A (en) * | 2004-06-23 | 2006-01-12 | Nippon Chemicon Corp | Electrolytic solution for electrolytic capacitors |
| CN115061003A (en) * | 2022-08-17 | 2022-09-16 | 南通江海电容器股份有限公司 | Method and device for evaluating life of electrolytic capacitor |
-
2002
- 2002-11-11 JP JP2002326721A patent/JP2004165261A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006012984A (en) * | 2004-06-23 | 2006-01-12 | Nippon Chemicon Corp | Electrolytic solution for electrolytic capacitors |
| CN115061003A (en) * | 2022-08-17 | 2022-09-16 | 南通江海电容器股份有限公司 | Method and device for evaluating life of electrolytic capacitor |
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