摘要:
A method of anodizing comprising suspending at least one aluminum substrate into an electrolyte solution and applying an anodizing current to the electrolyte solution, wherein the electrolyte solution comprises from about 5 to about 99.5 wt % glycerine, about 0.05 to about 5.0 wt. % of at least one orthophosphate salt selected from the group consisting of ammonium phosphates, alkali metal phosphates, amine phosphates, or mixtures thereof, and water.
摘要:
An electrolytic solution comprising glycerine and an organic salt, an inorganic salt, or mixtures thereof, and having a pH of less than about 7. The electrolytic solution has a water content of less than 0.1 weight percent and is prepared by mixing the glycerine and the salt or their acidic and basic ionogen components and heating to above 150.degree. C. A method of anodizing a metal comprising forming a film on the metal with said electrolytic solution. The metal is preferably a valve metal, such as tantalum, and the film is formed at a temperature of 150.degree. C. or higher.
摘要:
Acid-doped, polyaniline-based polymers are formed into fibers, films, and coatings with a solvent of at least one bicyclic terpene. Such a solvent system is characterized by a drying temperature of less than 150.degree. C. and a relatively low toxicity.
摘要:
Acid-doped, polyaniline-based polymers are formed into fibers, films, and coatings with a solvent of N-ethylpyrrolidone. Such a solvent system is particularly useful for the formation of a solid electrolyte on a capacitive element.
摘要:
An electrolytic solution comprising glycerine and dibasic potassium phosphate. The electrolytic solution has a water content of less than 1000 ppm and is prepared by mixing the glycerine and the dibasic potassium phosphate and then heating to about 150.degree. to 180.degree. C. for about 1 to 12 hours. A method of anodizing a metal comprising forming a film on the metal with an electrolytic solution comprising glycerine and dibasic potassium phosphate. The metal is preferably a valve metal, such as tantalum, and the film is formed at a temperature of 150.degree. C. or higher.
摘要:
The present invention relates to a method for making a solid electrolytic capacitor having a low equivalent series resistance by impregnating a porous capacitor pellet with conductive polymer. An oxidized pellet is dipped in a high concentration conductive polymer solution to deposit the polymer in doped (conductive) form. The solution also contains a crosslinking agent to prevent redissolution of the polymer when the pellet is re-dipped. After dipping, the solvent in the polymer solution is evaporated and a conductive film formed. In order to evaporate the solvent quickly, the solvent should have a boiling point of 80-220° C. and preferably a boiling point of 100-150° C. The conductive polymer film has a low resistivity (less than 1 ohm-cm, preferably less than 0.2 ohm-cm).
摘要:
Conductive polymers are formed with a self-regenerating oxidant system made with a reversibly reducible metal salt at amounts sufficient to polymerize a cyclic monomer through oxidation and leave a reduced metal ion, and an oxidant in an amount sufficiently small and under conditions sufficient to oxidize the reduced metal ion but avoid oxidation or degradation of the polymer. The most preferred combination of agents includes ferric nitrate and a small amount of ammonium nitrate at a pH within the range of 2 to 7.
摘要:
Acid-doped, polyaniline-based polymers are formed into fibers, films, and coatings with a solvent of N-ethylpyrrolidone. Such a solvent system is particularly useful for the formation of a solid electrolyte on a capacitive element.
摘要:
Acid-doped, polyaniline-based polymers are formed into fibers, films, and coatings with a solvent of N-ethylpyrrolidone. Such a solvent system is particularly useful for the formation of a solid electrolyte on a capacitive element.
摘要:
An intrinsically conductive polymer is prepared with a chemical oxidative process. The polymer is prepared by first dipping or coating a substrate with an Fe(III)-containing oxidizer solution and drying. The substrate is then dipped or coated with a monomer, such as 3,4-ethylenedioxythiophene solution, and reacted to form the conductive polymer. The monomer is dissolved in a solvent in which it has a high solubility but in which the Fe(III)-containing oxidizer has low solubility. This minimizes cross-contamination of the monomer and oxidizer dipping solutions thereby making this process suitable for high volume production. Dissolving the monomer in a solvent allows control over the stoichiometric ratio of monomer to oxidizer and prevents an excess of monomer thereby facilitating the removal of any unreacted monomer by water. The substrate is then dipped in an aqueous solution of para-toluenesulfonic acid to facilitate the removal of Fe(II) byproducts by enhancing their solubility in water and then the substrate may be washed with an aqueous solution or pure water. The process produces low ESR and low leakage valve metal capacitors with conductive polymer cathodes.