Patent ID: 7780835

Claim:
A process for preparing a capacitor comprising: forming an aluminum plate; without pre-hydration contacting said plate with an anodizing solution comprising glycerine, 0.1 to about 2.0%, by weight, water and 0.01 to about 0.5%, by weight, soluble orthophosphate; applying a first voltage to said aluminum plate and determining an initial current; maintaining said first voltage until a first measured current is no more than 50% of said initial current; increasing said first voltage to a second voltage and redetermining an initial current at said second voltage; maintaining said second voltage until a second measured current is no more than about 50% of said redetermined initial current, and continuing said increasing said voltage and said maintaining said increased voltage until a final voltage is achieved, wherein said capacitor has a capacitance above 9 μf−V/cm 2 at 250 volts.