Capacitor prepared from a non-aqueous electrolyte
View Patent ↗Non-aqueous electrolytic solutions suitable for anodizing valve metal derivative anodes, methods of anodizing using non-aqueous electrolytic solutions, and capacitors prepared with non-aqueous electrolytic solutions. The non-aqueous electrolytic solution comprises glycerine and at least one soluble salt formed by the neutralization of at least one non-halogen-containing organic or inorganic acid anion with at least one alkali metal, ammonium, or protonated amine cation; wherein the acid anion is derived from an acid having a pKa lower than phosphoric acid.
1. A capacitor comprising an anode prepared from a valve-metal derivative powder and a non-aqueous electrolytic solution comprising glycerine and at least one soluble salt formed by the neutralization of at least one non-halogen-containing organic or inorganic acid anion with at least one alkali metal, ammonium, or protonated amine cation; wherein the acid anion is derived from an acid having a pKa lower than phosphoric acid, and wherein the valve-metal derivative powder is a valve metal-derived nitride, sub-nitride, oxide, or sub-oxide, or an alloy thereof, a mixture thereof, or a metallic glass composition thereof.
2. The capacitor according to claim 1 wherein the soluble salt is ammonium nitrate, dimethyl ethanolamine nitrate, dimethyl ethanolamine sulfate, dimethylethoxy ethanolamine nitrate, or dimethylethoxy ethanolamine sulfate.
3. The capacitor according to claim 2 wherein the soluble salt is ammonium nitrate.
4. The capacitor according to claim 1 wherein water content of the solution is less than 2 wt %, based on total weight of the solution.
5. The capacitor according to claim 4 wherein water content of the solution is less than 1 wt %, based on total weight of the solution.
6. The capacitor according to claim 1 wherein the solution comprises about 0.5 wt % to about 15 wt % of the soluble salt, based on total weight of the solution.
7. The capacitor according to claim 6 wherein the solution comprises about 5 wt % to about 10 wt % of the soluble salt, based on total weight of the solution.
8. The capacitor according to claim 1 wherein the valve-metal derivative is tantalum nitride, niobium nitride, or titanium nitride.