Electrolyte for electrolytic capacitor and electrolytic capacitor using the same
AssigneeMitsubishi Chemical Corporation
InventorsMasayuku Takeda, Masahiro Takehara, Makoto Ue
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Abstract
An electrolyte for an electrolytic capacitor which is high in electrolytic conductivity, excellent in heat stability and high in withstand voltage. An electrolyte for an electrolytic capacitor including a tetrafluoroaluminate ion; and an electrolyte for an electrolytic capacitor containing a salt and a solvent, characterized in that electrolytic conductivity X (mS·cm−1) at 25° C. and withstand voltage Y (V) of a capacitor satisfy the relationships of formulae (I):Y≧−7.5X+150, and X≦4, Y>0.
Claims29
An electrolyte for an electrolytic capacitor containing a salt and a solvent, wherein the electrolyte satisfies the relationships of formulae (I):
- Y≧−7.5X+150, and X≧4, Y>0 (I)
- wherein X represents an electrolytic conductivity (mS·cm−1) at 25° C., and Y represents a withstand voltage (V) of a capacitor.
An electrolytic capacitor electrolyte, comprising:
- a tetrafluoraluminate ion,
- wherein the tetrafluoroaluminate ion is contained in the form of at least one salt selected from the group consisting of quaternary onium salts, amine salts, ammonium salts and alkali metal salts of tetrafluoroaluminate.
An electrolytic capacitor electrolyte, comprising:
- a tetrafluoroaluminate ion;
- wherein the electrolyte contains 50% by weight or more of a solvent, and the solvent is at least one solvent selected from the group consisting of carbonic esters, carboxylic esters, phosphoric esters, nitriles, amides, sulfones, alcohols and water.
An electrolytic capacitor electrolyte, comprising:
- a tetrafluoroaluminate ion and a solvent;
- wherein the solvent is at least one solvent selected from the group consisting of sulfolane and γ-butyrolactone, and 1-ethyl-2,3-dimethylimidazolinium tetrafluoroaluminate or 1,2,3,4-tetramethylimidazolinium tetrafluoroaluminate is added to the solvent in an amount of 5 to 40% by weight based on the total weight of the electrolyte.
An electrolytic capacitor electrolyte, comprising:
- a tetrafluoroaluminate ion;
- wherein the electrolyte further contains at least one additive selected from the group consisting of nitro compounds, phosphorus compounds, boron compounds, metal oxide particles, polyalkylene glycols and silicone oil.
Dependencies are inferred from the claim text.