Ok, so my theory - a very simple resonant cell is the following :
1.Make the cell with larger surface area ( preferably tubes ) and CALCULATE the capacity of the cell
- add in parallel with the cell additional capacitors to raise capacity
2.After the cell ( negative connectors ) connect the inductor
- wind the inductor of thicker wire so it can withstand higher current (up to say 10-20 amps )
- higher inductance the better :D
Now why add capacitors ?
Simple the higher the capacity the lower inductance is needed for resonant frequency, and the capacitors are far cheaper and easier to get than coated wire for transformer winding.
Why coils ?
Well as we know the back emf ( we call it the self inductance here ) is the voltage that goes back in the reverse direction after we cut the voltage for coil. So when we add it AFTER the cell it will discharge itself in cell and its extra capacitors. And they start to resonate (at least for the off time period of PWM )
I will post pictures of this theory from simulations using multisim soon.