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| OF THE PREFERRED EMBODIMENTS Referring to FIG. 3, there are shown relationships between the water ... |
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| Apparatus for inductively-coupled-plasma-enhanced ionized physical-vapor deposition |
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| Universal cold-cathode type ion source with closed-loop electron drifting and adjustable ionization gap |
| OF THE INVENTION FIGS. 4 to 8----Ion-Beam Source with Anode Moveable with Respect to Cathode FIG. 4... |
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| Supercapacitor structure |
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| Battery system for implantable medical device |
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| Electrochemical device |
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| Integrated thin-film solar battery |
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Polymer-ceramic composite electrolytes
| Details |
Inventors: Kumar, Binod; Scanlon, Jr., Lawrence G.; Schaffer, Jeffrey D.;
Assignee: The University of Dayton (Dayton, OH)
Primary Examiner: Speer; Timothy
Assistant Examiner:
Attorney, Agent or Firm: Killworth Gottman Hagan & Schaeff LLP
A polymer-ceramic composite electrolyte is provided which may be formed into a thin film having a room temperature conductivity of from 10.sup.-5 S cm.sup.-1 to 10.sup.-3 S cm.sup.-1. In one embodiment, the composite electrolyte comprises from about 30 to 60% by weight poly(ethylene oxide), from about 10 to 20% by weight lithium tetrafluoroborate, and from about 25 to 60% by weight lithium nitride. The film is preferably produced by mixing and grinding the components, then placing the ground mixture in a die and compacting the mixture to form a disc which is then flattened. The resulting film is annealed to ensure high conductivity at room temperature. |
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DETAILED DESCRIPTION The present invention meets those needs by providing a polymeric-ceramic composite electrolyte which may be formed into a thin film for use in a variety of electrochemical applications including lithium batteries.
The film has a high conductivity at room temperature and exhibits good lithium interfacial stability.
According to one aspect of the present invention, a polymer-ceramic composite electrolyte is provided comprising from about 30 to 60% by weight poly(ethylene oxide), from about 10 to 20% by weight lithium tetrafluoroborate (LiBF.
sub.
4), and from about 25 to 60% by weight lithium nitride (Li.
sub.
3 N).
In one embodiment of the invention, the composite electrolyte comprises 45% by weight poly(ethylene oxide), 15% by weight lithium tetrafluoroborate, and 40% by weight lithium nitride.
In an alternative embodiment, the composite electrolyte comprises 30% by weight poly(ethylene oxide), 10% by weight lithium tetrafluoroborate, and 60% by weight lithium nitride.
Preferably, the polymer-ceramic composite electrolyte of the present invention is in the form of a thin film which has been annealed such that the film has a room temperature conductivity of the order of about 10.
sup.
-5 S cm.
sup.
-1 to 10.
sup.
-3 S cm.
sup.
-1.
By room temperature conductivity, it is meant that the film exhibits high conductivity at temperatures ranging from about -40.
degree.
to 40.
degree.
C.
The film is preferably from about 0.
07 to 0.
15 mm thick.
In an alternative embodiment of the invention, a polymer-ceramic composite electrolyte film is provided which comprises from about 30 to 60% by weight of a polymer selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), and polyacrylonitrile, from about 10 to 20% by weight lithium tetrafluoroborate, and from about 25 to 60% by weight of a ceramic material selected from the group consisting of Li.
sub.
3 N, Al.
sub.
2 O.
sub.
3, SiO.
sub.
2, BN, Si.
sub.
3 N.
sub.
4, CaO, MgO, and SiC.
The film has preferably been annealed at a temperature of from about 50
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MEMS 
