Double current collector cathode design using the same active material in varying thicknesses for alkali metal or ION electrochemical cells

摘要

A new sandwich cathode design is provided comprising a cathode active material provided in at least two different thicknesses. The different thickness cathode structures are then individually pressed on opposite sides of a current collector so that both are in direct contact with the substrate. Preferably, the cathode structure on the side facing the anode is of a lesser thickness than that on the opposite side of the current collector. Such an exemplary cathode design might look like:SVO(x)/current collector/SVO(y)/current collector/SVO(z), wherein x, y and z represent thicknesses and wherein x and z are lesser than y.