Cathode material for use in an electrochemical cell and method for preparation thereof
First Claim
1. A method for preparing a cathode material for use in an electrochemical cell of an implantable device, the method comprising the steps of:
- mixing a first binding material with a liquid solvent to produce a solution, wherein the first binding material is soluble in the solvent;
adding a second binding material to the solution, wherein the second binding material is also soluble in the solvent; and
adding carbon and an active cathode compound to the solution forming a cathode material;
wherein the first and second binding materials are selected from a group of binding materials soluble in the solvent to react with each other.
1 Assignment
0 Petitions
Accused Products
Abstract
A cathode material is fabricated using two binder compounds, polyethylene oxide and acrylic resin, which react during processing to achieve enhanced bonding. The cathode material is formed by dissolving acrylonitril resin within the acetonitrile solvent. Polyethylene oxide powder is added yielding a homogenous solution. A powder mix containing a carbon material, such as high surface area carbon powder, and an active cathode compound, such as polycarbon monoflouride, is added to the binder mixture to produce a slurry. In one embodiment, the slurry is heated to evaporate the solvents, yielding a thin flexible cathode material for mounting to an expanded screen current collector. In an alternative embodiment, the slurry is spread directly onto a foil current collector. The solvents thereafter evaporate from the slurry yielding excellent mechanical and electrical coupling between the active cathode compound and the current collector. The resulting cathode structure and a lithium anode structure are mounted to opposing sides of a polymeric separator for use within an electrochemical cell of an implantable medical device.
96 Citations
19 Claims
-
1. A method for preparing a cathode material for use in an electrochemical cell of an implantable device, the method comprising the steps of:
-
mixing a first binding material with a liquid solvent to produce a solution, wherein the first binding material is soluble in the solvent; adding a second binding material to the solution, wherein the second binding material is also soluble in the solvent; and adding carbon and an active cathode compound to the solution forming a cathode material; wherein the first and second binding materials are selected from a group of binding materials soluble in the solvent to react with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A cathode material for use in an electrochemical cell of an implantable device, wherein the cathode material is prepared by performing the steps of:
-
mixing a first binding material with a liquid solvent to produce a solution, wherein the first binding material is soluble in the solvent; adding a second binding material to the solution, wherein the second binding material is also soluble in the solvent; and adding carbon and an active cathode compound to the solution forming a cathode material; wherein the first and second binding materials are selected from a group of binding materials soluble in the solvent to react with each other. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16, 17, 18, 19)
-
-
15. An electrochemical cell for use in an implantable device, the electrochemical cell comprising:
-
an electrode structure comprising; a cathode structure having a cathode material mounted on a metal current collector, the cathode material formed of acrylonitril resin and poly ethyhylene oxide, carbon and an active cathode compound, an anode, and a separator between the anode and the cathode; a housing surrounding the electrode structure; and a non-aqueous electrolyte filling a portion of the housing.
-
Specification