Cyanometallate cathode battery and method for fabrication

The method of claim further comprising:

• forming an immediate, low resistance contact between the anode and the third electrode;
• immersing the anode and cathode in an electrolyte;
• creating a battery external voltage potential between the cathode and the anode;
• and,
• wherein intercalating “B” metal ions from the third electrode to the selected electrode includes intercalating “B” metal ions from the anode into the cathode.

A cyanometallate cathode battery, the battery comprising:

• an electrolyte;
• a cathode of AX′M1YM2Z(CN)N.MH2O in a battery charged state;
• where “A” is selected from a first group of metals;
• where M1 and M2 are transition metals;
• where X′ is less than or equal to 2;
• where Y is less than or equal to 1;
• where Z is less than or equal to 1;
• where N is less than or equal to 6;
• where M is less than or equal to 20;
• an anode including “B” metal ions, selected from the first group of metals, in the battery charged state;
• a metal ion-permeable membrane separating the anode from the cathode;
• and,
• wherein the cathode is BDAX′M1YM2Z(CN)N.MH2O in a battery discharged state, where D>0.