Electrolytic solution for electric double layer capacitor and electric double layer capacitor
AssigneeThe Japan Carlit Co., Ltd.
InventorKazumi Chiba
Life of this patent
Estimating the term…
Abstract
An electrolytic solution for an electric double layer capacitor is provided. A spiro compound of formula (1) is provided as an electrolyte in an aprotic solvent. The electric conductivity of the solution at −40° C. is 0.85 mS/cm or higher. This electrolytic solution provides a high dissolution of electrolyte in solvent and exhibits excellent conductivity and electrostatic capacity over a wide range of temperatures Further, the electrolytic solution exhibits high resistance to voltage, even under long-term high voltage load, and exhibits suppressed lowering of electrostatic capacity allowing the solution to excel in long-term stability.
Claims13
An electrolytic solution for an electrical double layer capacitor comprising a spiro compound of the formula (1) as an electrolyte dissolved in an aprotic solvent and having a conductivity of 0.85mS/cm or more at −40° C,
- wherein m and n individually represent a natural number from 3-7 and X- represents a tetrafluoroborate anion.
A method for lowering the temperature dependence of the electrostatic capacity and/or internal resistance of an electrical double layer capacitor comprising filling the inside of the electrical double layer capacitor with an electrolytic solution comprising spiro-(1,1)-bipyrrolidinium tetrafluoroborate or piperidine-1-spiro-1′-pyrrolidinium tetrafluoroborate dissolved in an aprotic solvent.
Dependencies are inferred from the claim text.