Profile responsive electrode ensemble

1. An electrochemical energy storage system comprising:

first electrochemical cells that are electrically connected and disposed in a first stack; and

second electrochemical cells that are electrically connected and disposed in a second stack, wherein,

the first electrochemical cells comprise anode electrodes and cathode electrodes that are thicker than the respective anode electrodes and cathode electrodes of the second electrochemical cells,

the first stack and the second stack are electrically connected in parallel, and

the first and the second electrochemical cells belong to the same class of electrochemical cells.

2. The electrochemical energy storage system of claim 1 , wherein the second electrochemical cells are configured to be charged and discharged with at least one of higher power densities and specific power values than the first electrochemical cells.

3. The electrochemical energy storage system of claim 1 , wherein the first electrochemical cells and the second electrochemical cells each comprise:

an electrolyte; and

a separator located between the anode electrode and the cathode electrode,

wherein the anode electrode, cathode electrode, electrolyte and separator of the second electrochemical cells are made of the same materials as the respective anode electrode, cathode electrode, electrolyte and separator of the first electrochemical cells.

4. The electrochemical energy storage system of claim 3 , wherein:

the cathode electrode in operation reversibly intercalates alkali metal cations; and

the anode electrode comprises a capacitive electrode which stores charge through a reversible nonfaradiac reaction of alkali metal cations on a surface of the anode electrode or a pseudocapacitive electrode which undergoes a partial charge transfer surface interaction with alkali metal cations on a surface of the anode electrode.

5. The electrochemical energy storage system of claim 4 , wherein the anode electrode comprises activated carbon and the cathode electrode comprises a doped or undoped cubic spinel λ-MnO 2 -type material.

6. The electrochemical energy storage system of claim 1 , wherein the first stack and the second stack have the same number of electrochemical cells.

7. The electrochemical energy storage system of claim 1 , further comprising third electrochemical cells the third electrochemical cells each having:

an anode electrode;

a cathode electrode;

an electrolyte; and

a separator located between the anode electrode and the cathode electrode,

wherein the anode electrode, cathode electrode, electrolyte and separator of the electrochemical cells comprise the same materials as the respective anode electrode, cathode electrode, electrolyte and separator of the first and second electrochemical cells, and both the anode and the cathode electrodes of the respective first and second electrochemical cells are thicker than the respective anode and cathode electrodes of the third electrochemical cells.

8. The electrochemical energy storage system of claim 7 , wherein each of the second electrochemical cells comprises thicker anode and cathode electrodes than respective anode and cathode electrodes of the third electrochemical cells.

9. The electrochemical energy storage system of claim 1 , wherein the first electrochemical cells and the second electrochemical cells are impedance matched for a predetermined duty profile.

10. The electrochemical energy storage system of claim 1 , wherein the first electrochemical cells and the second electrochemical cells are made of the same materials and the geometries thereof are optimized for at least one of a higher energy density and a higher power density at the electrode level.

11. A method of making an electrochemical energy storage system, comprising:

electrically coupling first electrochemical cells in a first stack, and electrically coupling second electrochemical cells in a second stack; and

electrically connecting the first stack and the second stack in parallel, wherein,

the first electrochemical cells comprise anode electrodes and cathode electrodes that are thicker than the respective anode electrodes and cathode electrodes of the second electrochemical cells, and

the first and the second electrochemical cells belong to the same class of electrochemical cells.

12. The method of claim 11 , further comprising:

performing a Fourier analysis on a predetermined duty profile to determine time domains for energy storage; and

impedance matching the first electrochemical cells and the second electrochemical cells for the predetermined duty profile.

13. The method of claim 11 , wherein the first electrochemical cell and the second electrochemical cell each comprise:

an electrolyte; and

a separator located between the anode electrode and the cathode electrode,

wherein the anode electrode, cathode electrode, electrolyte and separator of the second electrochemical cell comprise same materials as the respective anode electrode, cathode electrode, electrolyte and separator of the first electrochemical cell.

14. The method of claim 13 , further comprising electrically connecting a third stack in parallel to the first and second stack, the third stack comprising third electrochemical cells, the third electrochemical cell having a different geometry than the first and second electrochemical cells.

15. A method of making an electrochemical energy storage system, comprising:

operatively connecting at least a first type of electrochemical cell and a second type of electrochemical cell, wherein the first type of electrochemical cell and the second type of electrochemical cell have different geometries;

wherein the first type of electrochemical cell and the second type of electrochemical cell each comprise:

an anode electrode;

a cathode electrode;

an electrolyte; and

a separator located between the anode electrode and the cathode electrode,

wherein the anode electrode, cathode electrode, electrolyte and separator of the second type of electrochemical cell comprise same materials as the respective anode electrode, cathode electrode, electrolyte and separator of the first type of electrochemical cell, and both the anode and the cathode electrodes of the first type of electrochemical cell are thicker than the respective anode and cathode electrodes of the second type of electrochemical cell,

performing a Fourier analysis on a predetermined duty profile;

determining time domains over which energy should be stored for the first type of electrochemical cell and the second type of electrochemical cell based on the step of performing; and

selecting the anode and cathode thickness of the first and second types of cells based on the step of determining.