Batteries utilizing electrode coatings directly on nanoporous separators
View Patent ↗Provided are lithium batteries utilizing electrode coatings directly on nanoporous separators, the batteries comprising (a) a separator/cathode assembly, (b) a separator/anode assembly, and (c) an electrolyte, where the batteries comprise alternating layers of the separator/cathode assembly and the separator/anode assembly. Preferably, a portion of the separator/cathode assembly is not in contact with the separator/anode assembly and a portion of the separator/anode assembly is not in contact with the separator/cathode assembly, and electrically conductive edge connections are made through these portions. Also provided are methods of preparing such lithium batteries.
1. A lithium battery comprising:
a separator/cathode assembly, wherein said separator/cathode assembly comprises a cathode current collector layer interposed between a first cathode layer and a second cathode layer and a first porous separator layer on a side of said first cathode layer opposite to the side of said cathode current collector layer, and wherein said first cathode layer is coated directly on said first porous separator layer;
a separator/anode assembly, wherein said separator/anode assembly comprises an anode current collector layer interposed between a first anode layer and a second anode layer and a second porous separator layer on a side of said first anode layer opposite to the side of said anode current collector layer, and wherein said first anode layer is coated directly on said second porous separator layer and said second porous separator layer comprises inorganic oxide particles and comprises no pores larger than 0.2 microns in diameter; and
an electrolyte, wherein said battery comprises alternating layers of said separator/cathode assembly and said separator/anode assembly, and the distance between the first cathode layer and the second anode layer is less than 9 microns.
2. The battery of claim 1 , wherein said first cathode layer comprises electrode particles selected from the group consisting of electroactive particles and electrically conductive particles, and wherein said electrode particles are not present in said first separator layer.
3. The battery of claim 1 , wherein said first separator layer comprises separator particles, and wherein said separator particles are not present in said first cathode layer.
4. The separator/anode assembly of claim 3 , wherein said separator particles are selected from the group consisting of, inorganic nitride particles, inorganic carbonate particles, inorganic sulfate particles, and polymer particles.
5. The battery of claim 1 , wherein a first portion of said separator/cathode assembly and a second portion of said separator/cathode assembly are in electrical contact with each other and are not in contact with said separator/anode assembly.
6. The battery of claim 1 , wherein a first portion of said separator/anode assembly and a second portion of said separator/anode assembly are in electrical contact with each other and are not in contact with said separator/cathode assembly.
7. The battery of claim 1 , wherein the thickness of said separator layer of said separator/cathode assembly is less than 9 microns.
8. The battery of claim 1 , wherein the thickness of said second separator layer is less than 9 microns.
9. The battery of claim 1 , wherein said first separator layer comprises a xerogel membrane.
10. The battery of claim 1 , wherein said first separator layer comprises aluminum boehmite.
11. The battery of claim 1 , wherein said first separator layer is a heat resistant separator layer with dimensional stability at 200° C.
12. The battery of claim 1 , wherein said second separator layer comprises a xerogel membrane.
13. The battery of claim 1 , wherein said second separator layer comprises aluminum boehmite.
14. The battery of claim 1 , wherein said second separator layer is a heat resistant separator layer with dimensional stability at 200° C.
15. The battery of claim 1 , wherein said cathode current collector layer of said separator/cathode assembly comprises an electrically conductive material selected from the group consisting of electrically conductive metals, electrically conductive carbons, and electrically conductive polymers.
16. The battery of claim 1 , wherein said cathode current collector layer of said separator/cathode assembly comprises two or more layers coated directly on said first cathode layer, and wherein at least one of said two or more layers comprises an electrically conductive material comprising carbon.
17. The battery of claim 1 , wherein said anode current collector layer of said separator/anode assembly comprises an electrically conductive material selected from the group consisting of electrically conductive metals, electrically conductive carbons, and electrically conductive polymers.
18. The battery of claim 1 , wherein said anode current collector layer of said separator/anode assembly comprises two or more layers coated directly on said first anode layer, and wherein at least one of said two or more layers comprises an electrically conductive material comprising carbon.
19. The battery of claim 1 , wherein said first anode layer comprises electrode particles selected from the group consisting of electroactive particles and electrically conductive particles, and wherein said electrode particles are not present in said second separator layer.
20. The battery of claim 1 , wherein said second separator layer comprises separator particles, and wherein said separator particles are not present in said first anode layer.
21. The battery of claim 20 , wherein said separator particles are selected from the group consisting of inorganic nitride particles, inorganic carbonate particles, inorganic sulfate particles, and polymer particles.
22. A lithium battery comprising:
a separator/cathode assembly, wherein said separator/cathode assembly comprises a cathode current collector layer interposed between a first cathode layer and a second cathode layer and a first porous separator layer on a side of said first cathode layer opposite to the side of said cathode current collector layer, and wherein said first cathode layer is coated directly on said first porous separator layer;
a separator/anode assembly, wherein said separator/anode assembly comprises an anode layer and a second porous separator layer on a side of said anode layer, and wherein said anode layer is coated directly on said second porous separator layer and said second porous separator layer comprises inorganic oxide particles and comprises no pores larger than 0.2 microns in diameter; and
an electrolyte; wherein said battery comprises alternating layers of said separator/cathode assembly and said separator/anode assembly, and the distance between the second cathode layer and the anode layer is less than 9 microns.
23. The battery of claim 22 , wherein said anode layer comprises lithium metal.
24. The battery of claim 22 , wherein said first cathode layer and second cathode layer comprise sulfur or a polysulfide of the formula, S x 2− , wherein x is an integer from 2 to 8.