Self-organizing battery structure with electrode particles that exert a repelling force on the opposite electrode
View Patent ↗An electrochemical device includes a first electrode in electrical communication with a first current collector, a second electrode in electrical communication with a second current collector and a crosslinked solid polymer in contact with the first and second electrodes. At least one of the first and second electrodes includes a network of electrically connected particles comprising an electroactive material, and the particles of one electrode exert a repelling force on the other electrode when the first and second electrodes are combined with an uncrosslinked precursor to the solid polymer.
1. An electronic device comprising:
a first electrode in electrical communication with a first current collector;
a second electrode in electrical communication with a second current collector,
a crosslinked polymer in contact with the first and second electrodes, wherein the crosslinked polymer has a thickness of between about 0.5 microns and about 5 microns at at least one point, and
wherein the first electrode has a reflective index n 1 , the second electrode has a refractive index n 3 , an uncrosslinked precursor to the polymer has a refractive index n 2 , and n 1 <n 2 <n 3 , and
wherein at least one of the first and second electrodes is comprised of a network of electrically connected particles comprising an electroactive material, and wherein the particles of at least one electrode exert a repelling force on the other electrode sufficient to promote self-organization of the particles when the first and second electrodes are combined with the uncrosslinked precursor to the polymer.
2. The device of claim 1 , wherein the device is an electrochemical device.
3. The device of claim 2 , wherein the polymer is a solid polymer electrolyte.
4. The device of claim 2 , wherein the polymer is an insulating polymer.
5. The device of claim 1 , wherein both first and second electrodes are comprised of an electrically connected network of particles.
6. The device of claim 2 , wherein the first electrode comprises a lithium intercalating material.
7. The device of claim 2 , wherein the second electrode comprises a lithium intercalating material.
8. The device of claim 1 , wherein first electrode is a cathode and the electroactive material is selected from compounds based on LiCoO 2 , LiCoO 2 doped with Mg, LiNiO 2 , LiMn 2 O 4 , LiMnO 2 , LiMnO 2 doped with Al, LiFePO 4 , LiMnPO 4 , LixV6O 13 , Li 2 Fe 2 (SO 4 ) 3 , V 2 O 5 , V 6 O 11 .
9. The device of claim 1 , wherein the second electrode is an anode and the electroactive material is selected from compounds based on carbon, amorphous carbon, graphite, mesocarbon microbeads, Li, LiAl, Li 9 Al 4 , Li 3 Al, Zn, LiZn, Ag, LiAg, Li 10 Ag 3 , B, Li 5 B 4 , Li 7 B 6 , Ge, Si, Li 12 Si 7 , Li 21 Si 8 , Li 13 Si 4 , Li 21 Si 5 , Sn, Li 5 , Sn 2 , Li 13 , Sn 5 , Li 7 Sn 2 , Li 22 Sn 5 , Sb, Li 2 Sb, Li 2 Sb, Li 3 Sb, Bi, LiBi, Li 3 Bi, SnO 2 , SnO, MnO, Mn 2 O 3 , MnO 2 , Mn 3 O 4 , CoO, NiO, FeO, LiFe 2 O 4 , TiO 2 , LiTi 2 O 4 , and glass with a Sn B P O compound.
10. The device of claim 1 , wherein the first and second electrode form an interpenetrating structure.
11. The device of claim 1 , wherein the crosslinked polymer comprises a crosslinked polyether.
12. The device of claim 11 , wherein the polyether is a methacrylate and/or acrylate of polyethylene glycol.
13. The device of claim 11 , wherein the polymer precursor comprises a crosslinkable poly(oxymethylene), poly(ethylene oxide), poly(propylene oxide), their mixtures, or their copolymers.
14. The device of claim 11 , wherein the crosslinked polymer comprises a crosslinked polyurethane formed from the reaction of hydroxy-terrninated or hydroxy-substituted poly(ethylene glycol) with polyisocyanates or a polycondensation product of hydroxy-terminated poly(ethylene glycol) with polyphenolics or melamine or melamine formaldehyde condensates.
15. The device of claim 11 , wherein the crosslinked polymer comprises the product of hydrosilanation of vinyl-terminated or vinyl-substituted poly(ethylene glycol) with compounds containing multiple Si—H bonds or an esterification product of a poly(ethylene glycol) with a crosslinking agent comprising carboxylic acid groups.
16. The device of claim 11 , wherein the crosslinked polymer comprises a crosslinked methacrylate- and/or acrylate- polyether.
17. The device of claim 1 , where the crosslinked polymer has a molecular weight between crosslinks of about 30 to 10 6 g/mol.
18. The device of claim 1 , where the crosslinked polymer has a molecular weight between crosslinks of about 30 to 10 4 g/mol.
19. The device of claim 1 , where the crosslinked polymer has a molecular weight between cross links of about 30 to 100 g/mol.
20. The device of claim 1 , wherein the crosslinked polymer is an electrolyte and has an ionic conductivity of greater than about 10 −7 S/cm.
21. The device of claim 1 , wherein the crosslinked polymer is an electrolyte and has an ionic conductivity of greater than about 10 −6 S/cm.
22. The device of claim 1 , wherein the crosslinked polymer is an electrolyte and has an ionic conductivity of greater than about 10 −5 S/cm.
23. The device of claim 1 , wherein at least one electrode is coated.
24. The device of claim 1 , wherein at least one electrode is comprised of an electrically connected network of coated particles.
25. The device of claim 1 , wherein at least one of the refractive indices n 1 and n 3 is provided by a coating on the electrode having that refractive index.