Abstract: The present invention aims to provide an electrolyte solution containing a quaternary ammonium salt as an electrolyte salt and is capable of providing an electrochemical device having a high capacitance retention and reducing generation of gas. The electrolyte solution of the present invention contains a solvent, a quaternary ammonium salt, and a nitrogen-containing unsaturated cyclic compound. The unsaturated cyclic compound is a nitrogen-containing unsaturated heterocyclic compound. The unsaturated cyclic compound excludes salts of the unsaturated cyclic compound and ionic liquids obtainable from the unsaturated cyclic compound.

Abstract: An electrolyte solution applicable to high-voltage electrochemical devices and capable of improving the cycle characteristics of electrochemical devices even at high voltage, and an electrochemical device. The electrolyte solution contains a fluorinated diether and a metal salt having a specific structure. The fluorinated diether is represented by CFR11R12—O—CH2CH2—O—R13, wherein R11 and R12 are each individually H, CH3, F, CH2F, CHF2, or CF3; and R13 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group.

Abstract: An electrolyte solution applicable to high-voltage electrochemical devices and capable of improving the cycle characteristics of electrochemical devices even at high voltage. The electrolyte solution contains a fluorinated acyclic carbonate and a metal salt having a specific structure. The fluorinated acyclic carbonate is represented by CF3—OCOO—R11 (wherein R11 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group) or CFH2—OCOO—R12 (wherein R12 is a C1 or C2 non-fluorinated alkyl group or a C1 or C2 fluorinated alkyl group).

Abstract: An electrolyte solution for an electrochemical device, such as a lithium secondary battery, or module. The electrolyte solution contains: a solvent that contains a fluorinated acyclic carbonate having a fluorine content of 33 to 70 mass %; at least one organosilicon compound selected from a compound represented by the formula (1): (R11)n11—M11—O—SiR12R13R14 and a compound represented by the formula (2): R21R22R23—Si—F; a lithium salt (3) that contains an oxalato-complex as an anion; and a lithium salt (4) represented by the formula (4): LizM31FxOy, where R11, M11, R12, R13, R14, R21, R22, R23 and M31 are as defined herein.

Abstract: An electrolyte solution for an electrochemical device, such as a lithium secondary battery, or module. The electrolyte solution contains a solvent; an electrolyte salt; at least one compound (X) selected from a compound represented by R11X11—SO3M11 and a compound represented by R21R22N—SO3M21; and at least one organosilicon compound selected from a compound represented by (R31)n31-M31-O—SiR32R33R34 and a compound represented by R41R42R43—Si—F, where R11, X11, M11, R21, R22, M21, R41, R42 and R43 are as defined herein.

Abstract: The present invention provides an electrolytic solution capable of providing an electrochemical device, such as a lithium ion secondary battery, or a module that has excellent high-temperature storage performance. The electrolytic solution contains: a homocyclic compound other than aromatic compounds; and a cyclic dicarbonyl compound. The homocyclic compound contains at least one group selected from the group consisting of a nitrile group and an isocyanate group.

Abstract: The present invention provides an electrolytic solution capable of providing an electrochemical device (e.g., a lithium ion secondary battery) or a module that is less likely to generate gas even in high-temperature storage and has high capacity retention even after high-temperature storage. The present invention relates to an electrolytic solution which may contain a compound represented by Y21R21C—CY22R22 wherein R21 and R22 may be the same as or different from each other, and are each H, an alkyl group, or a halogenated alkyl group; Y21 and Y22 may be the same as or different from each other, and are each —OR23 or a halogen atom; and R23 is H, an alkyl group, or a halogenated alkyl group.

Abstract: An electrolyte solution intended for use in electrochemical devices which can achieve a high capacitance retention ratio even after long-term use at high voltage. The electrolyte solution of the present invention includes a mononitrile compound (I), at least one compound (II) selected from dinitrile compounds and trinitrile compounds, and a quaternary ammonium salt (III). The amount of the compound (II) in the electrolyte solution is 0.05 to 5% by mass.

Abstract: The present invention aims to provide an electrolyte solution containing a quaternary ammonium salt as an electrolyte salt and is capable of providing an electrochemical device having a high capacitance retention and reducing generation of gas. The electrolyte solution of the present invention contains a solvent, a quaternary ammonium salt, and a nitrogen-containing unsaturated cyclic compound. The unsaturated cyclic compound is a nitrogen-containing unsaturated heterocyclic compound. The unsaturated cyclic compound excludes salts of the unsaturated cyclic compound and ionic liquids obtainable from the unsaturated cyclic compound.

Abstract: The present invention aims to provide an electrolyte solution and an electrochemical device which can keep the initial capacitance and are less likely to increase the internal resistance even after long-term use. An electrolyte solution includes: a tetraalkyl quaternary ammonium salt (A); a heterocyclic ring-containing quaternary ammonium salt (B); and a solvent, the sum of concentrations of the tetraalkyl quaternary ammonium salt (A) and the heterocyclic ring-containing quaternary ammonium salt (B) being 0.6 to 2.1 mol/L, the ratio of the concentration of the tetraalkyl quaternary ammonium salt (A) to the concentration of the heterocyclic ring-containing quaternary ammonium salt (B) (A/B) being 0.015 to 1.000.

Abstract: The present invention aims to provide an electrolyte solution that is less likely to lead to an increase in resistance and realizes high capacity retention factor even after continuous application of a high voltage, and to provide an electrochemical device. The present invention provides an electrolyte solution including: a nitrile compound; and a quaternary ammonium salt, the electrolyte solution having a potassium ion content of less than 10 ppm, a moisture content of 20 ppm or less, a tertiary amine content of 30 ppm or less, a heterocyclic compound content of 30 ppm or less, and an ammonia content of 20 ppm or less.

Abstract: The present invention aims to provide an electrolyte solution which has a low initial resistance, the resistance of which is less likely to increase even after long-term use, and which has high capacity retention. The present invention relates to: (i) an electrolyte solution including a mononitrile compound and a spirobipyrrolidinium salt, and being free from a non-fluorinated sulfolane compound, the spirobipyrrolidinium salt being present at a concentration of not less than 0.70 mol/L but less than 1.00 mol/L; and (ii) an electrolyte solution including a mononitrile compound, a non-fluorinated sulfolane compound, and a spirobipyrrolidinium salt, the spirobipyrrolidinium salt being present at a concentration of not less than 0.70 mol/L and not more than 1.30 mol/L.

Abstract: The present invention provides a conductive protective layer-forming paste for current collector laminates which can be used even for high voltage designs to protect current collectors from corroding without loss of cell characteristics, and a current collector laminate, an electrode laminate, and nonaqueous secondary cells (e.g. a lithium secondary cell, an electric double layer capacitor) that include a conductive protective layer formed therefrom. The paste for forming conductive protective layers for current collector protection includes: polytetrafluoroethylene; and a conductive filler (b). The current collector laminate includes: a conductive protective layer (A); and a current collector (B), the conductive protective layer (A) being formed by coating the paste for forming conductive protective layers onto the current collector (B).

Abstract: An electrolyte solution intended for use in electrochemical devices which can achieve a high capacitance retention ratio even after long-term use at high voltage. The electrolyte solution of the present invention includes a mononitrile compound (I), at least one compound (II) selected from dinitrile compounds and trinitrile compounds, and a quaternary ammonium salt (III). The amount of the compound (II) in the electrolyte solution is 0.05 to 5% by mass.

Abstract: The present invention provides an electric double layer capacitor having a high withstanding voltage, less deterioration, and excellent long-term reliability, especially an effect of suppressing expansion. The present invention relates to an electrolyte solution for an electric double layer capacitor. The solution comprises an electrolyte-salt-dissolving solvent (I) and an electrolyte salt (II). The electrolyte-salt-dissolving solvent (I) contains a fluorine-containing chain ether and a nitrile compound.

Abstract: The present invention aims to provide an electrolyte solution that is less likely to lead to an increase in resistance and realizes high capacity retention factor even after continuous application of a high voltage, and to provide an electrochemical device. The present invention provides an electrolyte solution including: a nitrile compound; and a quaternary ammonium salt, the electrolyte solution having a potassium ion content of less than 10 ppm, a moisture content of 20 ppm or less, a tertiary amine content of 30 ppm or less, a heterocyclic compound content of 30 ppm or less, and an ammonia content of 20 ppm or less.

Abstract: An object of the present invention is to provide an electric double layer capacitor which has a high withstand voltage, and is resistant to degradation and excellent in long term reliability. Disclosed is an electrolytic solution for an electric double layer capacitor including a solvent (I) for dissolving an electrolyte salt and an electrolyte salt (II), wherein the solvent (I) for dissolving an electrolyte salt includes a sulfolane compound and a fluorine-containing chain ether. Also disclosed is an electric double layer capacitor using the electrolytic solution.

Abstract: The present invention provides an electric double layer capacitor that has a high withstand voltage, is more resistant to degradation, and also has good cycle characteristics. The present invention relates to an electrolytic solution for an electric double layer capacitor, comprising: (I) a solvent for dissolving an electrolyte salt; and (II) an electrolyte salt, wherein the solvent (I) for dissolving an electrolyte salt includes propylene carbonate and at least one selected from the group consisting of a fluorine-containing chain carbonate and a fluorine-containing chain ether. The present invention also relates to an electric double layer capacitor comprising the electrolytic solution.

Abstract: Provided is an electric double-layer capacitor excellent in long-term reliability, particularly in suppressing its expansion, and a non-aqueous electrolytic solution for the electric double-layer capacitor.

Abstract: The present invention provides an electric double layer capacitor having a high withstanding voltage, less deterioration, and excellent long-term reliability, especially an effect of suppressing expansion. The present invention relates to an electrolyte solution for an electric double layer capacitor. The solution comprises an electrolyte-salt-dissolving solvent (I) and an electrolyte salt (II). The electrolyte-salt-dissolving solvent (I) contains a fluorine-containing chain ether and a nitrile compound.