JP4502380B2 - Electrolytic solution for electric double layer capacitor and electric double layer capacitor - Google Patents
Electrolytic solution for electric double layer capacitor and electric double layer capacitor Download PDFInfo
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- JP4502380B2 JP4502380B2 JP2004226217A JP2004226217A JP4502380B2 JP 4502380 B2 JP4502380 B2 JP 4502380B2 JP 2004226217 A JP2004226217 A JP 2004226217A JP 2004226217 A JP2004226217 A JP 2004226217A JP 4502380 B2 JP4502380 B2 JP 4502380B2
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- 239000008151 electrolyte solution Substances 0.000 title claims description 37
- 239000003990 capacitor Substances 0.000 title claims description 36
- 239000003792 electrolyte Substances 0.000 claims description 22
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 15
- -1 Tetrafluoroborate Chemical compound 0.000 claims description 13
- 125000003003 spiro group Chemical group 0.000 claims description 9
- 239000012046 mixed solvent Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 150000002367 halogens Chemical class 0.000 claims description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 claims description 2
- 230000007774 longterm Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RWRDLPDLKQPQOW-UHFFFAOYSA-O Pyrrolidinium ion Chemical compound C1CC[NH2+]C1 RWRDLPDLKQPQOW-UHFFFAOYSA-O 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 150000005678 chain carbonates Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- FPCAUQVIDHNSKU-UHFFFAOYSA-N 3-ethyl-5-azoniaspiro[4.4]nonane Chemical compound C1C(CC)CC[N+]11CCCC1 FPCAUQVIDHNSKU-UHFFFAOYSA-N 0.000 description 1
- XEYHFNNNWRPOHF-UHFFFAOYSA-N 5-azoniaspiro[4.5]decane Chemical compound C1CCC[N+]21CCCCC2 XEYHFNNNWRPOHF-UHFFFAOYSA-N 0.000 description 1
- 235000012093 Myrtus ugni Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 244000061461 Tema Species 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Electric Double-Layer Capacitors Or The Like (AREA)
Description
本発明は、電気二重層キャパシタ用電解液及び電気二重層キャパシタに関する。 The present invention relates to an electrolytic solution for an electric double layer capacitor and an electric double layer capacitor.
電気二重層キャパシタは、分極性電極と電解液との界面に形成される電気二重層を利用した電荷蓄積デバイスである。 An electric double layer capacitor is a charge storage device using an electric double layer formed at the interface between a polarizable electrode and an electrolyte.
電気二重層キャパシタに用いられる電解液は、電解液の粘性率が高い及び／または電導度が低いとキャパシタの内部抵抗が大きくなり、充放電時に電圧が降下する等の不都合が生ずるため、低粘性率、高電導度で、かつ長期間の耐久性が要求される。 The electrolyte used in the electric double layer capacitor has a low viscosity because the electrolyte has a high viscosity and / or a low conductivity, and the capacitor has a high internal resistance and a voltage drop during charging and discharging. High durability, high electrical conductivity, and long-term durability are required.
従来、電気二重層キャパシタ用電解液としては、特に長期間の耐久性を考慮し、プロピレンカーボネート（以下、「ＰＣ」と略記する。）中に、テトラフルオロホウ酸トリエチルメチルアンモニウム（以下、「ＴＥＭＡ−ＢＦ４」と略記する。）に代表される第４級アンモニウム塩からなる電解質を溶解させたものが一般的に用いられている（例えば、特許文献１参照）。 Conventionally, as an electrolytic solution for an electric double layer capacitor, triethylmethylammonium tetrafluoroborate (hereinafter referred to as “TEMA”) in propylene carbonate (hereinafter abbreviated as “PC”), particularly considering long-term durability. A solution in which an electrolyte made of a quaternary ammonium salt typified by -BF 4 ") is dissolved is generally used (see, for example, Patent Document 1).
しかしながら、ＰＣ溶媒は、温度３０℃での粘性率が約２．５ｍＰａ・ｓと高いため、該溶媒に電解質を溶解させた電解液は、粘性率が高く、かつ電導度が低いことから、該電解液を用いて作製した電気二重層キャパシタは、内部抵抗が大きくなってしまうという欠点があった。 However, since the PC solvent has a high viscosity of about 2.5 mPa · s at a temperature of 30 ° C., an electrolytic solution obtained by dissolving an electrolyte in the solvent has a high viscosity and a low electrical conductivity. The electric double layer capacitor produced using the electrolytic solution has a drawback that the internal resistance increases.
一方、ジメチルカーボネート（以下、「ＤＭＣ」と略記する。）等の鎖状カーボネートは、粘性率が低く、該溶媒に電解質を溶解させた電解液は、粘性率が低く、かつ電導度が高いことから、該電解液を用いて作製した電気二重層キャパシタは、内部抵抗が小さく、長期間の耐久性を有することが期待されているが、ＤＭＣは融点が約３℃であることから、低温領域で電解液が凝固し、電導度が著しく低下してしまい、電気二重層キャパシタが使用不能となるという欠点があった。 On the other hand, a chain carbonate such as dimethyl carbonate (hereinafter abbreviated as “DMC”) has a low viscosity, and an electrolytic solution obtained by dissolving an electrolyte in the solvent has a low viscosity and a high conductivity. Therefore, the electric double layer capacitor produced using the electrolytic solution is expected to have low internal resistance and long-term durability, but DMC has a melting point of about 3 ° C. As a result, the electrolytic solution is solidified, the conductivity is remarkably lowered, and the electric double layer capacitor becomes unusable.
さらに、一般的に電気二重層キャパシタ用電解液の電解質として使用されるＴＥＭＡ−ＢＦ４は、鎖状カーボネートへの溶解度が低く、高電導度の電解液を得られないという解決すべき課題が残されていた。
本発明の目的は、粘性率が低く、優れた低温特性、すなわち低温領域においても電解液が凝固することなく、広い温度範囲で高い電導度を示し、かつ長期信頼性に優れた電気二重層キャパシタ用電解液と、該電解液を用いて作製されてなる電気二重層キャパシタを提供することにある。 An object of the present invention is an electric double layer capacitor having a low viscosity, an excellent low temperature characteristic, that is, a high conductivity in a wide temperature range without solidifying an electrolyte even in a low temperature region, and an excellent long-term reliability. And providing an electric double layer capacitor produced using the electrolytic solution.
本発明者らは、鋭意検討を行った結果、ＤＭＣ及びＰＣを含有する混合溶媒に、テトラフルオロホウ酸ピペリジン−１−スピロ−１’−ピロリジニウム（以下、「ＰＳＰ−ＢＦ４」と略記する。）に代表されるテトラフルオロホウ酸第４級スピロアンモニウムを溶解させた電解液が、粘性率が低く、低温領域でも凝固することなく、広い温度範囲で高い電導度を示し、かつ長期信頼性に優れていることを見いだし、本発明を完成するに至った。 As a result of intensive studies, the present inventors abbreviated as piperidine-1-spiro-1′-pyrrolidinium tetrafluoroborate (hereinafter “PSP-BF 4 ”) in a mixed solvent containing DMC and PC. Electrolyte in which quaternary spiroammonium tetrafluoroborate represented by (1) is dissolved has a low viscosity, does not solidify even in a low temperature region, exhibits high conductivity in a wide temperature range, and has long-term reliability. It was found that it was excellent, and the present invention was completed.
すなわち、本発明は、ＤＭＣ及びＰＣを含有する混合溶媒中、一般式〔１〕で表されるテトラフルオロホウ酸第４級スピロアンモニウムが、電解質として含有されてなることを特徴とする電気二重層キャパシタ用電解液であり、また、該電解液を用いて作製されてなる電気二重層キャパシタである。 That is, the present invention provides an electric double layer characterized in that a quaternary spiro ammonium tetrafluoroborate represented by the general formula [1] is contained as an electrolyte in a mixed solvent containing DMC and PC. It is an electrolytic solution for a capacitor, and is an electric double layer capacitor produced using the electrolytic solution.
本発明の電気二重層キャパシタ用電解液は、ＤＭＣ及びＰＣの混合溶媒中に、テトラフルオロホウ酸第４級スピロアンモニウムを電解質として溶解させてなり、該電解液は、低粘性率かつ優れた低温特性を示し、また広い温度範囲で高い電導度を示す。特に、ＤＭＣ及びＰＣの容量混合比が１０：９０乃至４０：６０の組成を有する電解液は、低温特性により優れている。 The electrolytic solution for an electric double layer capacitor of the present invention is obtained by dissolving quaternary spiro ammonium tetrafluoroborate as an electrolyte in a mixed solvent of DMC and PC, and the electrolytic solution has a low viscosity and an excellent low temperature. It exhibits properties and high conductivity over a wide temperature range. In particular, an electrolytic solution having a composition in which the volume mixing ratio of DMC and PC is 10:90 to 40:60 is superior in low temperature characteristics.
また、本発明の電解液を用いて作製した電気二重層キャパシタは、内部抵抗が低く、高電圧で作動させても静電容量の低下率及び内部抵抗の上昇率が小さく、耐電圧が高く長期信頼性に優れている。 In addition, the electric double layer capacitor produced using the electrolytic solution of the present invention has a low internal resistance, a low capacitance decrease rate and a low internal resistance increase rate even when operated at a high voltage, a high withstand voltage and a long-term Excellent reliability.
以下、本発明の電気二重層キャパシタ用電解液について、詳細に説明する。 Hereinafter, the electrolytic solution for electric double layer capacitor of the present invention will be described in detail.
本発明の電解二重層キャパシタ用電解液は、ＤＭＣ及びＰＣの混合溶媒中に、一般式〔１〕で表されるテトラフルオロホウ酸第４級スピロアンモニウムを電解質として溶解させたものである。 The electrolytic solution for an electrolytic double layer capacitor of the present invention is obtained by dissolving tetrafluoroborate quaternary spiro ammonium represented by the general formula [1] as an electrolyte in a mixed solvent of DMC and PC.
テトラフルオロホウ酸第４級スピロアンモニウムは、ＤＭＣ及びＰＣの混合溶媒への溶解度が高く、高濃度の電解液を調製することが可能であり、得られた電解液は、低粘性率、高電導度及び優れた低温特性を示す。 Tetrafluoroborate quaternary spiro ammonium has high solubility in a mixed solvent of DMC and PC, and it is possible to prepare a high concentration electrolytic solution. The obtained electrolytic solution has a low viscosity and high conductivity. Degree and excellent low temperature properties.
一般式〔１〕で表される第４級スピロアンモニウムカチオンとしては、例えば、アザシクロブタン−１−スピロ−１’−アザシクロブチルイオン、ピロリジン−１−スピロ−１’−アザシクロブチルイオン、スピロ−（１，１’）−ビピロリジニウムイオン、ピペリジン−１−スピロ−１’−ピロリジニウムイオン、スピロ−（１，１’）−ビピペリジニウムイオン、３−エチルピロリジニウム−１−スピロ−１’−ピロリジニウムイオン、３−エチルピロリジニウム−１−スピロ−１’−（３’−エチル）ピロリジニウムイオン、２，４−ジフルオロピロリジニウム−１−スピロ−１’−ピロリジニウムイオン、２，４−ジフルオロピロリジニウム−１−スピロ−１’−（２’，４’−ジフルオロ）ピロリジニウムイオンがあげられる。 Examples of the quaternary spiro ammonium cation represented by the general formula [1] include azacyclobutane-1-spiro-1′-azacyclobutyl ion, pyrrolidine-1-spiro-1′-azacyclobutyl ion, and spiro. -(1,1 ')-bipyrrolidinium ion, piperidine-1-spiro-1'-pyrrolidinium ion, spiro- (1,1')-bipiperidinium ion, 3-ethylpyrrolidinium-1-spiro -1′-pyrrolidinium ion, 3-ethylpyrrolidinium-1-spiro-1 ′-(3′-ethyl) pyrrolidinium ion, 2,4-difluoropyrrolidinium-1-spiro-1′-pyrrolidini And the 2,4-difluoropyrrolidinium-1-spiro-1 ′-(2 ′, 4′-difluoro) pyrrolidinium ion.
ＤＭＣ及びＰＣの混合比率は、１０：９０乃至４０：６０が望ましく、更に望ましくは３０：７０であり、ＤＭＣの比率が４０以上では、低温において電解液が凝固するため、不都合である。 The mixing ratio of DMC and PC is preferably 10:90 to 40:60, more preferably 30:70. If the ratio of DMC is 40 or more, the electrolyte solution is solidified at a low temperature, which is inconvenient.
上記電解液のテトラフルオロホウ酸第４級スピロアンモニウムの濃度は、０．５ｍｏｌ／Ｌ超、３．０ｍｏｌ／Ｌ以下、好ましくは、１．０ｍｏｌ／Ｌ超、２．０ｍｏｌ／Ｌ以下である。０．５ｍｏｌ／Ｌ以下では、電導度が不足し不都合であり、また、３．０ｍｏｌ／Ｌ超では、低温特性が著しく低下するとともに、経済的に劣り不都合である。 The concentration of quaternary spiro ammonium tetrafluoroborate in the electrolytic solution is more than 0.5 mol / L and not more than 3.0 mol / L, preferably more than 1.0 mol / L and not more than 2.0 mol / L. If it is 0.5 mol / L or less, the electrical conductivity is insufficient, which is inconvenient, and if it exceeds 3.0 mol / L, the low-temperature characteristics are remarkably deteriorated and economically inconvenient.
本発明の電気二重層キャパシタは、セパレータを挟み込んだ分極性電極に、駆動用電解液となる本発明の電解液を含浸させた後、ステンレス等の外装ケースに収容させて作製される。 The electric double layer capacitor of the present invention is produced by impregnating a polarizable electrode sandwiching a separator with the electrolytic solution of the present invention as a driving electrolytic solution, and then housing it in an outer case made of stainless steel or the like.
上記分極性電極としては、活性炭粉末、活性炭繊維等の炭素材料や貴金属酸化物材料、あるいは導電性高分子材料等が用いられるが、炭素材料が安価で好ましい。また、セパレータとしては、ポリエチレン、ポリプロピレン系不織布など、公知の素材からなるセパレータを用いることができる。 As the polarizable electrode, a carbon material such as activated carbon powder or activated carbon fiber, a noble metal oxide material, a conductive polymer material, or the like is used. A carbon material is preferable because it is inexpensive. Moreover, as a separator, the separator which consists of well-known raw materials, such as polyethylene and a polypropylene-type nonwoven fabric, can be used.
本発明の電気二重層キャパシタは、フィルム型、コイン型、円筒型、箱形などの形状に作製することができ、特に限定されない。 The electric double layer capacitor of the present invention can be produced in a shape such as a film type, a coin type, a cylindrical type, and a box shape, and is not particularly limited.
実施例
ＤＭＣ及びＰＣの容量混合比率が３０：７０の溶媒に、電解質であるＰＳＰ−ＢＦ４を溶解させて、濃度１．５ｍｏｌ／Ｌの電気二重層キャパシタ用電解液（以下、「ＰＳＰ−ＢＦ４／ＤＭＣ＋ＰＣ」と略記する。）を調製した。該電解液の温度３０℃における粘性率及び電導度の測定値を表１に示す。
Example PSP-BF 4 as an electrolyte was dissolved in a solvent having a volume mixing ratio of DMC and PC of 30:70, and an electrolytic solution for an electric double layer capacitor having a concentration of 1.5 mol / L (hereinafter referred to as “PSP-BF”). 4 / DMC + PC "). Table 1 shows the measured values of viscosity and electrical conductivity of the electrolyte at a temperature of 30 ° C.
別に、分極性電極として、活性炭粉末（粒径２０μｍ、比表面積２，０００ｍ２／ｇ）９０質量％とポリテトラフルオロエチレン粉末１０質量％とをロールで混練、圧延して厚さ０．４ｍｍのシートを作製した。このシートを、直径１３ｍｍφに打ち抜いて、円板状電極を作製した。 Separately, as a polarizable electrode, 90% by mass of activated carbon powder (particle diameter 20 μm, specific surface area 2,000 m 2 / g) and 10% by mass of polytetrafluoroethylene powder were kneaded and rolled to a thickness of 0.4 mm. A sheet was produced. This sheet was punched into a diameter of 13 mmφ to produce a disk-shaped electrode.
円板状電極２枚に、ポリプロピレン製セパレータを挟み込み、先に調製した電解液を真空含浸させた後、ステンレス製外装ケースに収容して、定格電圧３．３Ｖ、静電容量１．５Ｆのコイン型電気二重層キャパシタを完成した。 A polypropylene separator is sandwiched between two disk-shaped electrodes, and the electrolyte prepared above is vacuum-impregnated, and then accommodated in a stainless steel outer case. A coin having a rated voltage of 3.3 V and a capacitance of 1.5 F Type electric double layer capacitor was completed.
完成したキャパシタに、温度７０℃の恒温槽中、電圧３．３Ｖを１，０００時間印加させて長期信頼性試験を行った。初期及び長期信頼性試験後の、３０℃及び−２０℃における静電容量値及び内部抵抗値を表２に示す。なお、キャパシタの静電容量は電圧３．３Ｖで１時間充電後、１ｍＡで放電したときの電圧勾配から求め、表中の値は、サンプル１５個の測定値の平均値である。 The completed capacitor was subjected to a long-term reliability test by applying a voltage of 3.3 V for 1,000 hours in a thermostat at a temperature of 70 ° C. Table 2 shows the capacitance values and internal resistance values at 30 ° C. and −20 ° C. after the initial and long-term reliability tests. The capacitance of the capacitor is obtained from a voltage gradient when charged at a voltage of 3.3 V for 1 hour and then discharged at 1 mA, and the values in the table are average values of measured values of 15 samples.
比較例
実施例において、電解液として、濃度１．５ｍｏｌ／ＬのＰＳＰ−ＢＦ４を電解質とするＰＣ溶液（以下、「ＰＳＰ−ＢＦ４／ＰＣ」と略記する。）を用いた以外は、実施例と同様にして、電気二重層キャパシタ用電解液を得、粘性率及び電導度を測定した結果を比較例１に、同様に、電解液として、濃度１．５ｍｏｌ／ＬのＴＥＭＡ−ＢＦ４を電解質とするＰＣ溶液（以下、「ＴＥＭＡ−ＢＦ４／ＰＣ」と略記する。）を用いた結果を比較例２として、表１に示す。また、得られた電解液を用いた以外は、実施例と同様にして電気二重層キャパシタを作製し、長期信頼性試験を行った結果を表２に示す。
Comparative Example In the examples, the procedure was carried out except that a PC solution containing 1.5 mol / L PSP-BF 4 as an electrolyte (hereinafter abbreviated as “PSP-BF 4 / PC”) was used as the electrolyte. In the same manner as in the example, an electrolytic solution for an electric double layer capacitor was obtained, and the results of measuring the viscosity and conductivity were compared with Comparative Example 1, and similarly, TEMA-BF 4 having a concentration of 1.5 mol / L was used as the electrolytic solution. The results of using a PC solution as an electrolyte (hereinafter abbreviated as “TEMA-BF 4 / PC”) are shown in Table 1 as Comparative Example 2. In addition, Table 2 shows the results of producing an electric double layer capacitor and conducting a long-term reliability test in the same manner as in the example except that the obtained electrolytic solution was used.
本発明の実施例の電解液は、低粘性率と高電導度を併せ持つ組成であり、表１に示すように、本発明の電解液（実施例）は、ＰＣ単独の溶媒に第４級アンモニウム塩を電解質として含有させた電解液（比較例１及び２）に比べて、優れた電解液特性を示した。 The electrolyte solution of the example of the present invention has a composition having both low viscosity and high conductivity, and as shown in Table 1, the electrolyte solution of the present invention (example) is quaternary ammonium in a solvent of PC alone. Compared with the electrolytic solution containing the salt as an electrolyte (Comparative Examples 1 and 2), excellent electrolytic solution characteristics were exhibited.
また、表２に示すように、比較例１及び２の電解液を用いて作製したキャパシタは、常温における内部抵抗、低温時の容量減少率及び内部抵抗増加率が大きいのに対し、本発明の電解液を用いて作製したキャパシタ（実施例）は、常温における内部抵抗が低く、また、低温時の静電容量減少率及び内部抵抗増加率が小さく、良好な長期信頼性を示した。 In addition, as shown in Table 2, the capacitors produced using the electrolytes of Comparative Examples 1 and 2 have a large internal resistance at room temperature, a capacity decrease rate at low temperatures, and a large internal resistance increase rate. The capacitor (Example) produced using the electrolytic solution had a low internal resistance at room temperature, a low capacitance decrease rate and a low internal resistance increase rate at low temperatures, and showed good long-term reliability.
本発明のジメチルカーボネート及びプロピレンカーボネートを含有する混合溶媒に、テトラフルオロホウ酸第４級スピロアンモニウムが電解質として含有されてなる電気二重層キャパシタ用電解液、及び該電解液を用いて作製されてなる電気二重層キャパシタは、広い温度範囲にわたって、優れたキャパシタ特性及び長期信頼性を有し、小型電子機器から大型自動車用途まで、広範な産業分野においての使用が可能である。
The mixed solvent containing dimethyl carbonate and propylene carbonate of the present invention contains a quaternary spiro ammonium tetrafluoroborate as an electrolyte, and is prepared using the electrolytic solution for an electric double layer capacitor. The electric double layer capacitor has excellent capacitor characteristics and long-term reliability over a wide temperature range, and can be used in a wide range of industrial fields from small electronic devices to large automobile applications.
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