Optimization of electrochemical cell
A system and method for optimizing electrochemical cells including electrodes employing coordination compounds by mediating water content within a desired water content profile that includes sufficient coordinated water and reduces non-coordinated water below a desired target and with electrochemical cells including a coordination compound electrochemically active in one or more electrodes, with an improvement in electrochemical cell manufacture that relaxes standards for water content of electrochemical cells having one or more electrodes including one or more such transition metal cyanide coordination compounds.
1. An electrochemical cell, comprising:
a cell stack having a liquid anhydrous electrolyte, an anode electrode, a separator, and a cathode electrode, said electrodes electrochemically communicated with said liquid electrolyte; wherein at least one of said electrodes includes a hydrated transition metal cyanide coordination compound material having a composition conforming to formula I, formula I including A x P y [R(CN) 6 ] z (H 2 O) n ;
wherein A identifies as one or more alkali cations and P and R each represent one or more divalent or trivalent transition metal cations;
wherein 0.5<z<1;
wherein x, y, and z are related based on electrical neutrality, x>0, y>0, z>0; and
wherein n=6*(1−z)+m, and wherein n>0;
wherein 6*(1−z) identifies as a quantity of lattice bound water and m identifies as a quantity of non-coordinated water;
wherein m>0;
wherein 0<x≤2, and y=1; and
wherein P includes two or more different transition metal cations.
2. The electrochemical cell of claim 1 wherein said hydrated transition metal cyanide coordination compound material includes a water content of at least 0.01% by weight.
3. The electrochemical cell of claim 1 wherein z is about equal to 1.
4. The electrochemical cell of claim 2 wherein z is about equal to 1.
5. The electrochemical cell of claim 1 wherein m is equivalent to a weight percentage M=m*W H2O /W dry *100%, with W H2O being the molecular weight of water and W dry being the molecular weight for the composition of formula I excluding all of its water content.
6. The electrochemical cell of claim 2 wherein m is equivalent to a weight percentage M=m*W H2O /W dry *100%, with W H2O being the molecular weight of water and W dry being the molecular weight for the composition of formula I excluding all of its water content.
7. The electrochemical cell of claim 3 wherein m is equivalent to a weight percentage M=m*W H2O /W dry *100%, with W H2O being the molecular weight of water and W dry being the molecular weight for the composition of formula I excluding all of its water content.
8. The electrochemical cell of claim 1 wherein P includes a first P multivalent transition metal cation and includes a second P multivalent transition metal cation different from said first P multivalent transition metal cation.
9. The electrochemical cell of claim 8 wherein said first P multivalent transition metal cation includes a multivalent iron cation.
10. The electrochemical cell of claim 9 wherein said second P multivalent transition metal cation includes a multivalent manganese cation.
11. The electrochemical cell of claim 8 wherein said first P multivalent transition metal cation includes a multivalent manganese cation.
12. The electrochemical cell of claim 1 wherein R includes a first R multivalent transition metal cation and includes a second R multivalent transition metal cation different from said first R multivalent transition metal cation.
13. The electrochemical cell of claim 12 wherein said first R multivalent transition metal cation includes a multivalent iron cation.
14. The electrochemical cell of claim 13 wherein said second R multivalent transition metal cation includes a multivalent manganese cation.
15. The electrochemical cell of claim 12 wherein said first R multivalent transition metal cation includes a multivalent manganese cation.
16. The electrochemical cell of claim 8 wherein R includes a first R multivalent transition metal cation and includes a second R multivalent transition metal cation different from said first R multivalent transition metal cation.
17. The electrochemical cell of claim 16 wherein said first multivalent transition metal cations each include a multivalent iron cation.
18. The electrochemical cell of claim 16 wherein said first multivalent transition metal cations each include a multivalent manganese cation.
19. The electrochemical cell of claim 17 wherein said second multivalent transition metal cations each include a multivalent manganese cation.
20. The electrochemical cell of claim 2 wherein said hydrated transition metal cyanide coordination compound material includes a water content less than about 12% by weight.