CN1794390A - Method of increasing specific capacity of double-layer capacitor - Google Patents

Method of increasing specific capacity of double-layer capacitor Download PDF

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Publication number
CN1794390A
CN1794390A CN 200510048252 CN200510048252A CN1794390A CN 1794390 A CN1794390 A CN 1794390A CN 200510048252 CN200510048252 CN 200510048252 CN 200510048252 A CN200510048252 A CN 200510048252A CN 1794390 A CN1794390 A CN 1794390A
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methylimidazole
ethyl
butyl
organic solvent
ionic liquid
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CN 200510048252
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李开喜
孙国华
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Shanxi Institute of Coal Chemistry of CAS
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Shanxi Institute of Coal Chemistry of CAS
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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)

Abstract

This invention relates to a method for increasing the specific capacitance of a double-layer capacitor charactering that the electrolyte of the capacitor is composed of an ionic solution and an organic solvent with the mol ratio of 1:9 to 9:1.

Description

A kind of method that improves specific capacity of double-layer capacitor
Technical field
Thereby the present invention relates to a kind ofly improve ionic liquid with organic solvent and improve the method for capacitor than electric capacity.
Background technology
Ionic liquid has another name called room temperature fused salt, is a kind of liquid salt that presents under room temperature or the condition near room temperature.But, thereby make it not higher than electric capacity as the electrolyte of capacitor the time because the viscosity height of ionic liquid itself hinders the free movement of its ion.Japanese for this reason patent of invention 1641922 is reported in adds fluorinated hydrocarbon compound in the ionic liquid, can reduce the viscosity of electrolyte, has improved the electric capacity of double electric layer capacitor.But shortcoming is that the organic solvent that conduct mixes with ionic liquid must satisfy its dielectric constant height, electrochemical stability is good and the high requirement of boiling point, and fluorohydrocarbon boiling point and stability are all very poor.Add organic solvent carbonates (as ethylene carbonate, diethyl carbonate, propylene carbonate, butylene carbonate etc.) to ionic liquid such as quaternary ammonium salt (JP-A 61-32509, JP-A63-173312, JP-A 10-55717) and quaternary alkylphosphonium salt (JP-A 62-252927), though can improve ion liquid solubility, because the not high ratio electric capacity of the capacitor that obtains that causes of ion liquid electrochemical window and conductivity is not high only for about 120F/g.
Summary of the invention
The purpose of this invention is to provide a kind of by in ionic liquid, adding the method that organic solvent improves specific capacity of double-layer capacitor.
Electrolyte solution for electric double layer capacitor of the present invention is to be combined by ionic liquid and organic solvent, and the mol ratio of ionic liquid and organic solvent is 1: 9 to 9: 1.
Aforesaid ionic liquid is by glyoxaline cation and tetrafluoroborate (BF 4 -), hexafluoro-phosphate radical (PF 6 -), perchlorate (ClO 4 -), acetate (CH 3COO -), trifluoroacetic acid root (CF 3COO -), thiocyanate (SCN -), bisulfate ion (HSO 4 -) or phosphate radical (PO 4 -) the anion formation.
Aforesaid glyoxaline cation and tetrafluoroborate (BF 4 -), hexafluoro-phosphate radical (PF 6 -), perchlorate (ClO 4 -), acetate (CH 3COO -), trifluoroacetic acid root (CF 3COO -), thiocyanate (SCN -), bisulfate ion (HSO 4 -) or phosphate radical (PO 4 -) anion can provide by its a kind of material of forming.Can be selected from 1-ethyl-3-methyl imidazolium tetrafluoroborate, 1-ethyl-3-methylimidazole hexafluorophosphate, 1-ethyl-3-methylimidazole perchlorate, 1-ethyl-3-N-Methylimidazoleacetic salt, 1-ethyl-3-methylimidazole trifluoroacetate, 1-ethyl-3-methylimidazole phosphate, 1-ethyl-3-methylimidazole disulfate, 1-ethyl-3-methylimidazole thiocyanates, 1-butyl-3-methyl imidazolium tetrafluoroborate, 1-butyl-3-methylimidazole hexafluorophosphate, 1-butyl-3-methylimidazole perchlorate, 1-butyl-3-N-Methylimidazoleacetic salt, 1-butyl-3-methylimidazole trifluoroacetate, 1-butyl-3-methylimidazole phosphate, 1-butyl-3-methylimidazole disulfate or 1-butyl-3-methylimidazole thiocyanates.
Aforesaid glyoxaline cation comprises 1-ethyl-3-methylimidazole cation and 1-butyl-3-methylimidazole cation.
Described organic solvent is at least a among acetonitrile, acetone, gamma-butyrolacton, the toluene.
The present invention has following advantage:
Therefore advantages such as method of the present invention can make that electrolyte has that viscosity is low, good fluidity, conductivity height, electrochemical window are wide use this electrolyte, can improve the ratio electric capacity of double electric layer capacitor greatly.
Embodiment
Embodiment 1
Used electrolyte is (hereinafter to be referred as [EMIm] BF by ionic liquid 1-ethyl-3-methyl imidazolium tetrafluoroborate 4) and 4: 6 in molar ratio mixed getting of organic solvent acetonitrile (being designated hereinafter simply as AN).Carry out the constant current charge-discharge experiment, promptly at 25 ℃, under the condition of 1.5 volts of upper voltage limits, 0 volt of lower voltage limit, 1 milliampere of constant current, carry out charge/discharge repeatedly, after 50 circulations, obtaining than electric capacity is 240F/g.Ionic liquid [EMIm] BF 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 150F/g.
Embodiment 2
Used electrolyte is by ionic liquid [EMIm] BF 4With 1: 9 in molar ratio mixed getting of organic solvent A N.Carry out the constant current charge-discharge experiment, it is 186F/g that test obtains than electric capacity.Ionic liquid [EMIm] BF 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 150F/g.
Embodiment 3
Used electrolyte is by ionic liquid [EMIm] BF 4With 9: 1 in molar ratio mixed getting of organic solvent A N.Carry out the constant current charge-discharge experiment, it is 194F/g that test obtains than electric capacity.Ionic liquid [EMIm] BF 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 150F/g.
Embodiment 4
Used electrolyte is (hereinafter to be referred as [BMIm] BF by ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate 4) and 4: 6 in molar ratio mixed getting of organic solvent-acetone.Carry out the constant current charge-discharge experiment, it is 202F/g that test obtains than electric capacity.Ionic liquid [BMIm] BF 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 140F/g.
Embodiment 5
Used electrolyte is (hereinafter to be referred as [BMIm] PF by ionic liquid 1-butyl-3-methylimidazole hexafluorophosphate 6) and 2: 8 in molar ratio mixed getting of organic solvent gamma-butyrolacton.Carry out the constant current charge-discharge experiment, it is 195F/g that test obtains than electric capacity.Ionic liquid [BMIm] PF 6In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 135F/g.
Embodiment 6
Used electrolyte is (hereinafter to be referred as [EMIm] ClO by ionic liquid 1-ethyl-3-methylimidazole perchlorate 4) and 7: 3 in molar ratio mixed getting of organic solvent toluene.Carry out the constant current charge-discharge experiment, it is 200F/g that test obtains than electric capacity.Ionic liquid [EMIm] ClO 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 148F/g.
Embodiment 7
Used electrolyte is (hereinafter to be referred as [EMIm] CH by ionic liquid 1-ethyl-3-N-Methylimidazoleacetic salt 3COO) and organic solvent A N 8: 2 in molar ratio mixed.Carry out the constant current charge-discharge experiment, it is 202F/g that test obtains than electric capacity.Ionic liquid [EMIm] CH 3Do not add any organic solvent among the COO, testing its ratio electric capacity as capacitor electrolyte is 142F/g.
Embodiment 8
Used electrolyte is (hereinafter to be referred as [EMIm] CF by ionic liquid 1-ethyl-3-methylimidazole trifluoroacetate 3COO) and organic solvent A N 3: 7 in molar ratio mixed.Carry out the constant current charge-discharge experiment, it is 210F/g that test obtains than electric capacity.Ionic liquid [EMIm] CF 3Do not add any organic solvent among the COO, testing its ratio electric capacity as capacitor electrolyte is 148F/g.
Embodiment 9
Used electrolyte is (hereinafter to be referred as [BMIm] PO by ionic liquid 1-butyl-3-methylimidazole phosphate 4) and 4: 6 in molar ratio mixed getting of organic solvent A N.Carry out the constant current charge-discharge experiment, it is 220F/g that test obtains than electric capacity.Ionic liquid [BMIm] PO 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 138F/g.
Embodiment 10
Used electrolyte is by ionic liquid 1-ethyl-3-methylimidazole rhodanate (hereinafter to be referred as [EMIm] SCN) and 4: 6 in molar ratio mixed getting of organic solvent gamma-butyrolacton.Carry out the constant current charge-discharge experiment, it is 265F/g that test obtains than electric capacity.Do not add any organic solvent among ionic liquid [EMIm] SCN, testing its ratio electric capacity as capacitor electrolyte is 240F/g.
Embodiment 11
Used electrolyte is (hereinafter to be referred as [EMIm] HSO by ionic liquid 1-ethyl-3-methylimidazole disulfate 4) and 3: 7 in molar ratio mixed getting of organic solvent toluene.Carry out the constant current charge-discharge experiment, it is 252F/g that test obtains than electric capacity.Ionic liquid [EMIm] HSO 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 235F/g.
Embodiment 12
Used electrolyte is by ionic liquid [EMIm] BF 4Mixed with organic solvent 3: 7 in molar ratio, it is mixed by 1: 1 that described organic solvent is acetonitrile and toluene.Carry out the constant current charge-discharge experiment, it is 233F/g that test obtains than electric capacity.Ionic liquid [EMIm] BF 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 150F/g.
Embodiment 13
Used electrolyte is by ionic liquid [BMIm] PO 4With 8: 2 in molar ratio mixed getting of organic solvent, described organic solvent is that acetonitrile, acetone and toluene were by 1: 2: 3 mixed getting.Carry out the constant current charge-discharge experiment, it is 205F/g that test obtains than electric capacity.Ionic liquid [BMIm] PO 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 138F/g.
Embodiment 14
Used electrolyte is by ionic liquid [BMIm] PF 6With 2: 8 in molar ratio mixed getting of organic solvent, described organic solvent is acetonitrile, acetone, gamma-butyrolacton and toluene 5: 4: 2 in molar ratio: 1 mixed getting.Carry out the constant current charge-discharge experiment, it is 200F/g that test obtains than electric capacity.Ionic liquid [BMIm] PF 6In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 135F/g.
Embodiment 15
Used electrolyte is by ionic liquid [BMIm] HSO 4With 3: 7 in molar ratio mixed getting of organic solvent, described organic solvent is 4: 2: 1 in molar ratio mixed getting of acetone, gamma-butyrolacton and toluene.Carry out the constant current charge-discharge experiment, it is 248F/g that test obtains than electric capacity.Ionic liquid [BMIm] HSO 4In do not add any organic solvent, testing its ratio electric capacity as capacitor electrolyte is 235F/g.

Claims (6)

1, a kind of method that improves specific capacity of double-layer capacitor is characterized in that electrolyte solution for electric double layer capacitor is to be combined by ionic liquid and organic solvent, and the mol ratio of ionic liquid and organic solvent is 1: 9 to 9: 1.
2, a kind of method that improves specific capacity of double-layer capacitor as claimed in claim 1 is characterized in that described ionic liquid is made of glyoxaline cation and tetrafluoroborate, hexafluoro-phosphate radical, perchlorate, acetate, trifluoroacetic acid root, thiocyanate, bisulfate ion or phosphate radical anion.
3, a kind of method that improves specific capacity of double-layer capacitor as claimed in claim 2 is characterized in that described glyoxaline cation is 1-ethyl-3-methylimidazole cation or 1-butyl-3-methylimidazole cation.
4, a kind of method that improves specific capacity of double-layer capacitor as claimed in claim 2 is characterized in that described glyoxaline cation and tetrafluoroborate, hexafluoro-phosphate radical, perchlorate, acetate, trifluoroacetic acid root, thiocyanate, bisulfate ion or phosphate radical anion are to provide newspaper by a kind of material.
5, a kind of method that improves specific capacity of double-layer capacitor as claimed in claim 4 is characterized in that described a kind of material is 1-ethyl-3-methyl imidazolium tetrafluoroborate, 1-ethyl-3-methylimidazole hexafluorophosphate, 1-ethyl-3-methylimidazole perchlorate, 1-ethyl-3-N-Methylimidazoleacetic salt, 1-ethyl-3-methylimidazole trifluoroacetate, 1-ethyl-3-methylimidazole phosphate, 1-ethyl-3-methylimidazole disulfate, 1-ethyl-3-methylimidazole thiocyanates, 1-butyl-3-methyl imidazolium tetrafluoroborate, 1-butyl-3-methylimidazole hexafluorophosphate, 1-butyl-3-methylimidazole perchlorate, 1-butyl-3-N-Methylimidazoleacetic salt, 1-butyl-3-methylimidazole trifluoroacetate, 1-butyl-3-methylimidazole phosphate, 1-butyl-3-methylimidazole disulfate or 1-butyl-3-methylimidazole thiocyanates.
6, a kind of method that improves specific capacity of double-layer capacitor as claimed in claim 1 is characterized in that described organic solvent is at least a among acetonitrile, acetone, gamma-butyrolacton, the toluene.
CN 200510048252 2005-12-27 2005-12-27 Method of increasing specific capacity of double-layer capacitor Pending CN1794390A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102272999A (en) * 2009-08-10 2011-12-07 株式会社Lg化学 Lithium secondary battery
CN102760576A (en) * 2011-04-27 2012-10-31 海洋王照明科技股份有限公司 Electric double layer capacitor electrolyte and electric double layer capacitor using electrolyte
CN102760577A (en) * 2011-04-27 2012-10-31 海洋王照明科技股份有限公司 Double-electric layer capacitor electrolyte and double-electric layer capacitor using same
CN102956367A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN102956374A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN102956366A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN102956370A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN103426653A (en) * 2012-05-14 2013-12-04 海洋王照明科技股份有限公司 Electrolyte for electric double-layer capacitor
CN109119256A (en) * 2017-06-23 2019-01-01 东莞东阳光科研发有限公司 A kind of thermosensitive type supercapacitor and its application
CN113593933A (en) * 2021-07-23 2021-11-02 华中科技大学 MOFs ionic liquid super capacitor and preparation method thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102272999A (en) * 2009-08-10 2011-12-07 株式会社Lg化学 Lithium secondary battery
CN102760576A (en) * 2011-04-27 2012-10-31 海洋王照明科技股份有限公司 Electric double layer capacitor electrolyte and electric double layer capacitor using electrolyte
CN102760577A (en) * 2011-04-27 2012-10-31 海洋王照明科技股份有限公司 Double-electric layer capacitor electrolyte and double-electric layer capacitor using same
CN102956367A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN102956374A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN102956366A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN102956370A (en) * 2011-08-18 2013-03-06 海洋王照明科技股份有限公司 Electrolyte and preparation method thereof
CN102956366B (en) * 2011-08-18 2015-10-28 海洋王照明科技股份有限公司 Electrolyte and compound method thereof
CN103426653A (en) * 2012-05-14 2013-12-04 海洋王照明科技股份有限公司 Electrolyte for electric double-layer capacitor
CN109119256A (en) * 2017-06-23 2019-01-01 东莞东阳光科研发有限公司 A kind of thermosensitive type supercapacitor and its application
CN109119256B (en) * 2017-06-23 2021-12-03 东莞东阳光科研发有限公司 Thermosensitive super capacitor and application thereof
CN113593933A (en) * 2021-07-23 2021-11-02 华中科技大学 MOFs ionic liquid super capacitor and preparation method thereof

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