Double current collector cathode design using the same active material in varying thicknesses for alkali metal or ION electrochemical cells
AssigneeWilson Greatbatch Ltd.
InventorsHong Gan, Esther S. Takeuchi
Life of this patent
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Abstract
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.
Claims55
An electrochemical cell, which comprises:
- a) an anode;
- b) a cathode comprising a cathode active material provided as separate first and second cathode structures, the first cathode structure of a first thickness short circuited with the second cathode structure of a second thickness different than the first thickness, wherein the second structure faces the anode and wherein the first and second cathode structures are of the same cathode active material;
- and
- c) an electrolyte activating the anode and the cathode.
In combination with an implantable medical device requiring a substantially constant discharge current during a medical device monitoring function and at least one current pulse discharge for a medical device operating function, an electrochemical cell, which comprises:
- a) an anode;
- b) a cathode comprising a cathode active material provided as separate first and second cathode structures, the first cathode structure of a first thickness sandwiched between a first and second current collectors and with the second cathode structure of a second thickness contacting at least one of the first and second current collectors opposite the first cathode structure and facing the anode, wherein the second thickness is different than the first thickness and wherein the first and second cathode structures are of the same cathode active material;
- and
- c) a nonaqueous electrolyte activating the anode and the cathode.
An electrochemical cell, which comprises:
- a) an anode;
- b) a cathode comprising a cathode active material provided as separate first and second cathode structures, the first cathode structure of a first thickness contacted to one side of a current collector with the second cathode structure of a second thickness contacted to the opposite side of the current collector, wherein the first and second cathode structure are of the same cathode active material and wherein the second cathode structure has a lesser thickness than the first cathode structure and faces the anode;
- and
- c) a nonaqueous electrolyte activating the anode and the cathode.
An electrochemical cell, which comprises:
- a) a lithium anode;
- b) a cathode comprising 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 provided as separate first and second cathode structures, the first cathode structure of a first thickness sandwiched between a first and second titanium current collectors with second cathode structure of a second thickness less than the first thickness contacting at least one of the first and second current collectors opposite the first cathode structure and facing the anode, wherein the first and second cathode structures are of the same cathode active material;
- and
- c) a nonaqueous 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 cathode active material provided as separate first and second cathode structures, the first cathode structure of a first thickness short circuited with the second cathode structure of a second thickness, wherein the first and second cathode structures are of the same cathode active material with the second thickness being different than the first thickness;
- and
- c) activating the anode and cathode with a nonaqueous electrolyte activating the anode and the cathode.
Dependencies are inferred from the claim text.