Application US20190109347

ELECTROLYTE ADDITIVES FOR ELECTROCHEMICAL DEVICES
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US20190109347

1. A rechargeable electrochemical device, comprising: (3) (6)

a first electrode;

a second electrode;

an electrolyte coupled with said electrodes; and

a first additive in communication with said electrolyte;

wherein a first particular one electrode of said electrodes includes a first variable potential material; and

wherein said first additive participates in a first predetermined side-reaction with a first single one of said electrodes degrading a charging efficiency of said first single one of said electrodes for a duration of said first predetermined side-reaction.

2. The rechargeable electrochemical device of claim 1 wherein said duration is preconfigured for a reduction in a relative state-of-charge imbalance between said electrodes after charging of said electrodes. (0)

3. The rechargeable electrochemical device of claim 1 wherein said first particular one electrode includes a first transition metal cyanide coordination compound (TMCCC). (2) (0)

6. The rechargeable electrochemical device of claim 3 wherein said TMCCC material includes a composition having the general chemical formula A_xM_y[R(CN)_6-jL_j]_z.nH₂O, wherein: (0) (4)

A includes one or more cations;

M includes one or more metal cations;

R includes one or more transition metal cations; and

L is a ligand substituted in the place of a CN ligand; where
0≤x≤2;

0<y≤4;

0<z≤1;

0≤j<6; and

0≤n≤5.

7. The rechargeable electrochemical device of claim 3 wherein said electrolyte includes a total electrolyte volume V including a first quantity of water comprising a first fraction V1 of said total electrolyte volume V and including a second quantity of one or more organic cosolvents together comprising a second fraction V2 of said total electrolyte volume V, wherein V1>0.02, and wherein said electrolyte consists essentially of a single phase. (1) (0)

8. The rechargeable electrochemical device of claim 7 wherein V2>V1. (7) (0)

9. The rechargeable electrochemical device of claim 8 wherein said one or more organic solvents includes a solvent containing a cyanide group. (1) (0)

11. The rechargeable electrochemical device of claim 8 wherein said one or more organic cosolvents includes a solvent containing a sulfone group. (1) (0)

13. The rechargeable electrochemical device of claim 8 wherein a concentration of said additive is included within a range of 10 to 10,000 parts per million. (0)

14. The rechargeable electrochemical device of claim 8 wherein said additive includes one or more organic molecules. (2) (0)

15. The rechargeable electrochemical device of claim 14 wherein said one or more organic molecules are configured to participate in a reversible electrochemical redox reaction at one or more of said electrodes during an application of charging energy to said electrodes. (1) (0)

17. The rechargeable electrochemical device of claim 14 wherein said one or more organic molecules are configured to participate in an irreversible electrochemical redox reaction at one or more of said electrodes during an application of charging energy to said electrodes. (1) (0)

20. The rechargeable electrochemical device of claim 8 wherein said additive includes a transition metal salt. (2) (0)

25. The rechargeable electrochemical device of claim 8 wherein said additive includes an organometallic molecule. (3) (0)

29. The rechargeable electrochemical device of claim 8 wherein said additive includes a surfactant. (0)

4. The rechargeable electrochemical device of claim 1 further comprising a second additive in communication with said electrolyte wherein a second particular one electrode of said electrodes, different from said first particular one electrode of said electrodes, includes a second variable potential material; and wherein said second additive participates in a second predetermined side-reaction with a second single one of said electrodes. (1) (0)

30. A method for reducing a relative state-of-charge imbalance of a set of electrodes of a rechargeable electrochemical device during a recharging process, the set of electrodes coupled to an electrolyte and wherein at least one electrode of the set of electrodes includes a first variable potential material, comprising: (0) (2)

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Application US20190109347

ELECTROLYTE ADDITIVES FOR ELECTROCHEMICAL DEVICES

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