Efficient cell stack for cells with double current collectors sandwich cathodes
First Claim
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1. An electrochemical cell, which comprises:
- a) a first cathode structure of a first cathode active material of a first energy density and a first rate capability sandwiched between first and second cathode current collectors, and a second cathode active material of a second energy density and a second rate capability contacted to the first and second cathode current collectors opposite the first cathode active material, wherein the first energy density of the first cathode active material is greater than the second energy density while the first rate capability is less than the second rate capability of the second cathode active material;
b) a first anode structure of an alkali metal contacted to opposite sides of a first anode current collector, wherein the first anode structure is in electrical association with the second cathode active material contacting the first cathode current collector;
c) a second cathode structure having a third cathode active material of a third energy density and a third rate capability contacted to one side of a third cathode current collector, and a fourth cathode active material of a fourth energy density and a fourth rate capability contacted to the other side of the third cathode current collector, wherein the third energy density of the third cathode active material is greater than the fourth energy density while the third rate capability is less than the fourth rate capability of the fourth cathode active material and wherein the fourth cathode active material is in electrical association with the first anode structure opposite the second cathode active material contacting the first cathode current collector; and
d) a nonaqueous electrolyte activating the first anode structure and the first and second cathode structures.
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Abstract
The present invention improves the performance of lithium electrochemical cells by providing a new electrode assembly based on a sandwich cathode design, but termed a double screen sandwich cathode electrode design. In particular, the present invention uses sandwich cathode electrodes which are, in turn, sandwiched between two half double screen sandwich cathode electrodes, either in a prismatic plate or serpentine-like electrode assembly. In a jellyroll electrode assembly, the cell is provided in a case-positive design and the outside round of the electrode assembly is a half double screen sandwich cathode electrode.
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Citations
30 Claims
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1. An electrochemical cell, which comprises:
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a) a first cathode structure of a first cathode active material of a first energy density and a first rate capability sandwiched between first and second cathode current collectors, and a second cathode active material of a second energy density and a second rate capability contacted to the first and second cathode current collectors opposite the first cathode active material, wherein the first energy density of the first cathode active material is greater than the second energy density while the first rate capability is less than the second rate capability of the second cathode active material;
b) a first anode structure of an alkali metal contacted to opposite sides of a first anode current collector, wherein the first anode structure is in electrical association with the second cathode active material contacting the first cathode current collector;
c) a second cathode structure having a third cathode active material of a third energy density and a third rate capability contacted to one side of a third cathode current collector, and a fourth cathode active material of a fourth energy density and a fourth rate capability contacted to the other side of the third cathode current collector, wherein the third energy density of the third cathode active material is greater than the fourth energy density while the third rate capability is less than the fourth rate capability of the fourth cathode active material and wherein the fourth cathode active material is in electrical association with the first anode structure opposite the second cathode active material contacting the first cathode current collector; and
d) a nonaqueous electrolyte activating the first anode structure and the first and second cathode structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An electrochemical cell, which comprises:
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a) a first cathode structure of a first cathode active material of a first energy density and a first rate capability sandwiched between first and second cathode current collectors, and a second cathode active material of a second energy density and a second rate capability contacted to the first and second cathode current collectors opposite the first cathode active material, wherein the first energy density of the first cathode active material is greater than the second energy density while the first rate capability is less than the second rate capability of the second cathode active material;
b) a first anode structure of an alkali metal contacted to opposite sides of a first anode current collector, wherein the first anode structure is in electrical association with the second cathode active material contacting the first cathode current collector;
c) a second cathode structure of a third cathode active material of a third energy density and a third rate capability contacted to one side of a third cathode current collector, and a fourth cathode active material of a fourth energy density and a fourth rate capability contacted to the other side of the third cathode current collector, wherein the third energy density of the third cathode active material is greater than the fourth energy density while the third rate capability is less than the fourth rate capability of the fourth cathode active material and wherein the fourth cathode active material is in electrical association with the first anode structure opposite the second cathode active material contacting the first cathode current collector;
d) a second anode structure of the alkali metal contacted to opposite sides of a second anode current collector, wherein the second anode structure is in electrical association with the second cathode active material contacting the second cathode current collector;
e) a third cathode structure having a fifth cathode active material of a fifth energy density and a fifth rate capability contacted to one side of a fourth cathode current collector, and a sixth cathode active material of a sixth energy density and a sixth rate capability contacted to the other side of the fourth cathode current collector, wherein the fifth energy density of the fifth cathode active material is greater than the sixth energy density while the fifth rate capability is less than the sixth rate capability of the sixth cathode active material and wherein the sixth cathode active material is in electrical association with the second anode structure opposite the second cathode active material contacting the second cathode current collector; and
f) a nonaqueous electrolyte activating the first and second anode structures and the first, second and third cathode structures. - View Dependent Claims (23, 24)
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25. A method for powering an implantable medical device, comprising the steps of:
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a) providing the medical device;
b) providing an electrochemical cell, comprising the steps of;
i) providing a first cathode structure of a first cathode active material of a first energy density and a first rate capability sandwiched between first and second cathode current collectors, and a second cathode active material of a second energy density and a second rate capability contacted to the first and second cathode current collectors opposite the first cathode active material, wherein the first energy density of the first cathode active material is greater than the second energy density while the first rate capability is less than the second rate capability of the second cathode active material;
ii) providing a first anode structure of an alkali metal contacted to opposite sides of a first anode current collector, wherein the first anode structure is in electrical association with the second cathode active material contacting the first cathode current collector;
iii) providing a second cathode structure of a third cathode active material of a third energy density and a third rate capability contacted to one side of a third cathode current collector, and providing a fourth cathode active material of a fourth energy density and a fourth rate capability contacted to the other side of the third cathode current collector, wherein the third energy density of the third cathode active material is greater than the fourth energy density while the third rate capability is less than the fourth rate capability of the fourth cathode active material and wherein the fourth cathode active material is in electrical association with the first anode structure opposite the second cathode active material contacting the first cathode current collector; and
iv) activating the first anode structure and the first and second cathode structures with a nonaqueous electrolyte; and
c) electrically connecting the electrochemical cell to the medical device. - View Dependent Claims (26, 27, 28, 29, 30)
silver vanadium oxide/first cathode current collector/CFx/second cathode current collector/silver vanadium oxide.
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30. The method of claim 25 including providing the second cathode structure having the configuration:
CFx/third cathode current collector/silver vanadium oxide.
Specification