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| Waveguide security device |
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| Ink jet recording paper |
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| Random phase plate for holography and process for manufacturing same |
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| Transfer lamination of vapor deposited foils, method and product |
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| Method for applying an embossing foil to a flexible material |
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| Method of manufacture of foil material and the foil material made thereby |
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| Process for preparing blazed holograms |
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| Embossing foil |
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Method of fabricating an electrolytic cell employing a solid polymer electrolyte
| Details |
Inventors: Ehrlich, Grant M.;
Assignee: Yardney Technical Products, Inc. (Pawcatuck, CT)
Primary Examiner: Weiner; Laura
Assistant Examiner:
Attorney, Agent or Firm: Doherty; John R.
A solid polymer electrolyte for an electrolytic cell is prepared by a sol-gel process in which an active metal ion conducting liquid electrolyte, e.g. a lithium-ion electrolyte, containing a salt which is stable in the presence of water, e.g. lithium bisperfluoroethanesulfonimide, LiN(SO.sub.2 C.sub.2 F.sub.5).sub.2, is admixed in aqueous solution with an alkoxide, e.g. silica alkoxide, to form a liquid precursor which is added to the electrolytic cell between the anode and cathode thereof and allowed to solidify in situ to form the solid electrolyte. |
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DETAILED DESCRIPTION In accordance with the present invention, I have discovered that a working electrolytic cell can be fabricated using a sol-gel solid electrolyte employing in the liquid phase a salt which is stable in the presence of water.
The salt may be an alkali metal or alkaline earth metal salt and preferable is an organic lithium salt which is not reactive with water.
In the illustrated embodiment, the salt is lithium Bisperfluoroethanesulfonimide, LiN(SO.
sub.
2 C.
sub.
2 F.
sub.
5).
sub.
2.
The solid electrolyte is prepared by the sol-gel process in which a hydrolyzed metal precursor, that is, a metal alkoxide, such as a silica alkoxide, is admixed in aqueous solution with an active metal ion conducting liquid electrolyte, preferably a lithium-ion electrolyte, and an acid catalyst.
The liquid electrolyte may be prepared by dissolving the water stable alkali metal or alkaline earth metal salt with a suitable solvent, such as an organic solvent containing one or more carbonates.
The admixture is added as a liquid precursor to an electrolytic cell employing the usual anode and cathode materials and is allowed to gel or polymerize in situ to form the solid electrolyte of the invention.
Thus, the invention comprehends a novel method for fabricating an electrolytic cell employing a sol-gel solid electrolyte in which the electrolyte is added to the cell in its unactivated condition as a liquid and then solidifies to form a solid electrolyte, thereby enabling the manufacture of solid electrolytic cells as a liquid electrolytic system.
The invention also comprehends a solid electrolyte or separator medium for an electrolytic cell which after polymerization and drying comprises an inorganic metal oxide network encapsulating a liquid solution containing a salt which does not decompose in the presence of water, and a carbonate containing compound.
In the illustrated embodiment, the inorganic metal oxide network is silica(SiO.
sub.
2) and the liquid salt is lithium Bisperfluoroethanesulfonimide, LiN(SO
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Optical Systems 
