Lithium inks and electrodes and batteries made therefrom
View Patent ↗Lithium metal powder based inks are provided. The inks are provided in formulations suitable for printing using a variety of printing techniques, including screen printing, offset litho printing, gravure printing, flexographic printing, pad printing and inkjet printing. The inks include lithium metal powder, a polymer binder and optionally electrically conductive materials and/or lithium salts in a solvent. The inks are well suited for use in printing electrodes for use in lithium metal batteries. Batteries made from lithium powder based anodes and electronic applications such as RFID labels, Smart Cards and wearable medical devices are also provided.
1. An anode comprising:
(a) an anode current collector; and
(b) an electrode layer disposed on the anode current collector, the electrode layer comprising 20 to 80 percent lithium metal powder and 10 to 25 percent of a polymer binder, wherein the percentages are calculated on a dry weight basis;
wherein the lithium metal powder is formed by dispersing molten lithium metal in an inert medium and cooling the dispersion to below the melting point of the lithium.
2. The anode of claim 1 , wherein the polymer binder comprises a polyimide.
3. The anode of claim 1 wherein the electrode layer has an average thickness of no more than 30 microns.
4. The anode of claim 1 , wherein the electrode layer further comprises at least one lithium salt.
5. A battery comprising:
(a) the anode of claim 1 ;
(b) a cathode; and
(c) an electrolyte in electrochemical communication with the cathode and the anode.
6. The battery of claim 5 , wherein the electrolyte comprises a polyimide solid polymer electrolyte.
7. The battery of claim 6 , wherein the electrolyte comprise about 40 weight percent solvent or less.
8. The battery of claim 5 , wherein the electrolyte is optically clear.
9. The battery of claim 5 , wherein the cathode comprises:
(a) a cathode current collector; and
(b) an electrode layer disposed on the cathode current collector, the electrode layer comprising a polyimide, an electronic conductive filler and a metal oxide.
10. The battery of claim 5 , wherein the anode, cathode, and electrolyte each comprise pre-imidized, amorphous, thermoplastic polyimide that is soluble in a polar solvent.
11. A lithium metal battery comprising:
(a) a cathode;
(b) an anode comprising a printed electrode layer comprising 20 to 80 percent lithium metal powder and 10 to 25 percent of a polymer binder, wherein the percentages are calculated on a dry weight basis; and
(c) a polymer electrolyte sandwiched between the cathode and the anode;
wherein the lithium metal powder is formed by dispersing molten lithium metal in an inert medium and cooling the dispersion to below the melting point of the lithium.
12. The battery of claim 11 , wherein the electrode layer is printed on a current collector.
13. The battery of claim 11 , wherein the electrode layer is printed using a
printing method selected from the group consisting of screen-printing, offset litho printing,
gravure printing and flexographic printing.
14. A radiofrequency identification device, a Smart Card or a wearable medical device powered by the battery of claim 5 .