Optimization of electrochemical cell
AssigneeNatron Energy, Inc.
InventorsColin Deane Wessells, Daniel Friebel, Peter Benjamin Herman, Grace Marjorie Yee
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Abstract
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.
Claims10
An electrochemical cell, comprising:
- a cell stack having a liquid electrolyte, an anode electrode, a separator, and a cathode electrode, said electrodes electrochemically communicated with said liquid electrolyte, with components of said cell stack having an as-synthesized set of properties, a pre-communication set of properties before said electrodes are electrochemically communicated with said liquid electrolyte, and a post-communication set of properties after said electrodes are electrochemically communicated with said liquid electrolyte;
- wherein a first particular one electrode of said electrodes includes a transition metal cyanide coordination compound material having a composition conforming to formula I, formula I including AxPy[R(CN)6]z(H2O)n;
- wherein A represents an alkali cation and P and R each represent a multivalent transition metal cation;
- 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)+mk, with n>0, with k=0 identifying an as-synthesized material and k=1 to 2 identifying a set of post-synthesized states for said first particular one electrode, and with 6*(1−z) identifying as a quantity of coordinated water of said compound material, and with each mk>0, each mk identifying as a quantity of interstitial water of said compound material for one of said states of said first particular one electrode, with each said quantity mk of interstitial water being equivalent to a weight percentage Mk=mk*WH2O/Wdry*100%, with WH2O being the molecular weight of water and Wdry being the molecular weight of said composition conforming to formula I excluding all of its water content, with M0 identifying as an as-synthesized set of properties for said first particular one electrode, with M1 identifying as a pre-communication set of properties for said first particular one electrode, with M2 identifying as a post-communication set of properties for said first particular one electrode;
- and
- wherein said liquid electrolyte includes a polar organic solvent combined with an alkali metal salt and water having a water concentration, said water concentration including a pre-communication water concentration c1 and including a post-communication water concentration c2 and wherein c1>c2;
- wherein said as-synthesized set of properties includes M0 up to 45% for a set of as-synthesized materials, said set of as-synthesized materials including said composition conforming to formula I;
- wherein said M1 is less than 12% for a set of electrode materials of said first particular one electrode, said set of electrode materials including said composition conforming to formula I;
- and
- wherein M2>M1.
Dependencies are inferred from the claim text.