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

An electrochemical cell, which comprises:

• a) an anode;
• b) a cathode comprising a first formulation of a cathode active material and non-active materials sandwiched between a first and second current collectors and with a second formulation of the cathode active material and non-active materials contacting at least one of the first and second current collectors opposite the cathode active material of the first formulation and facing the anode, the first formulation having a greater percentage of the cathode active material than the second formulation, wherein the cathode active material of the first and second formulations is the same and wherein the non-active materials of the first and second formulations need not be the same;
• and
• c) an electrolyte activating the anode and the cathode.

An electrochemical cell, which comprises:

• a) an anode;
• b) a cathode comprising a first formulation of a cathode active material and non-active materials contacted to one side of a current collector with a second formulation of the cathode active material and non-active materials contacting the opposite side of the current collector, the first formulation having a greater percentage of the cathode active material than the second formulation, wherein the second formulation faces the anode, and wherein the cathode active material of the first and second formulations is the same and wherein the non-active materials of the first and second formulations need not be the same;
• and
• c) a nonagueous electrolyte activating the anode and the cathode.

An electrochemical cell, which comprises:

• a) a lithium anode;
• b) a cathode comprising a first formulation of a cathode active material selected from the group consisting of silver vanadium oxide, copper silver vanadium oxide, V2O5, MnO2, LiCoO2, LiNiO2, LiMnO2, CuO2, TiS2, Cu2S, FeS, FeS2, copper oxide, copper vanadium oxide, CFx, Ag2O, Ag2O2, CuF, Ag2CrO4, and mixtures thereof, and non-active materials sandwiched between a first and second titanium current collectors with a second formulation of the cathode active material and non-active materials contacting at least one of the first and second current collectors opposite the cathode active material of the first formulation, the first formulation having a greater percentage of the cathode active material than the second formulation, wherein the cathode active material of the first and second formulations is the same and wherein the non-active materials of the first and second formulations need not be the same;
• and
• c) a nonagueous electrolyte activating the anode and the cathode.

A method for providing an electrochemical cell, comprising the steps of:

• a) providing an anode;
• b) providing a cathode comprising a first formulation of a cathode active material and non-active materials short circuited with a second formulation of the cathode active material and non-active materials, wherein the first formulation has more of the cathode active material than the second formulation, and wherein the cathode active material of the first and second formulations is the same and wherein the non-active materials of the first and second formulations need not be the same;
• and
• c) activating the anode and cathode with an electrolyte activating the anode and the cathode.