Electrochemical cell with tmccc electrodes in an acetonitrile solvent including a dinitrile additive

An electrochemical structure, comprising:

• an electrolyte;
• a conductive structure in electrochemical communication with said electrolyte;
• and
• wherein said conductive structure includes a transition metal cyanide coordination compound material;
• wherein said electrolyte includes a set of solvents and a set of alkali metal salts in solution with one or more solvents of said set of solvents, and an additive disposed within one or more solvents of said set of solvents;
• wherein at least one solvent of said set of solvents includes a methyl cyanide including a linear alkane or alkene group and wherein said additive includes a linear alkane or alkene different from said linear alkane or alkene group of said methyl cyanide;
• wherein said additive includes a dinitrile material;
• wherein said transition metal cyanide coordination compound material includes a composition AxPy[R(CN)(6)]z n(H2O), wherein A includes an alkali metal cation, wherein P includes a transition metal cation, wherein R includes a transition metal cation, and wherein 0≤x≤2, y=1, 0.75≤z≤1, and 0≤n≤6;
• and
• wherein R includes Mn;
• and
• wherein said electrolyte further includes a quantity Q of water, Q>0.