Bonded hydrogen conducting solid electrolytes
First Claim
1. A method of chemically bonding hydronium ion conducting solid electrolyte powder into dense polycrystalline shaped bodies comprising the steps of:
- (a) selecting a hydronium containing powder and a bonding agent selected from the group of bonding agents consisting of hydronium conducting organic polymers and phosphates;
(b) intermingling the hydronium powder with the bonding agent to obtain a mixture;
(c) forming the mixture into a predetermined shape;
(d) curing the predetermined shape so as to create a dense polycrystalline shaped hydronium conducting ceramic body, in which the bonding agent does not affect the hydronium ion conductivity significantly.
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Accused Products
Abstract
Hydronium bonded polycrystalline shaped articles may be produced by the simple expedient of selecting a hydronium containing powder prepared by one of a plurality of prior art methods and then intermingling the hydronium powder with ortho-phosphoric acid to obtain a viscous mixture (resembling the consistency of toothpaste). The mixture is then formed into a predetermined shape, for example a disc or tube, and the shaped polycrystalline ceramic is allowed to cure. Curing may take place at an elevated temperature below 100° C. for approximately 3 hours either as a step subsequent to forming, or as part of the forming step in 30 minutes at 120° C. The result is bonded hydrogen conducting - hydronium, H3 O+, solid rigid structure with a smooth finish copying the mold from which it was shaped. Specifically, the hydronium containing powders are selected from the group of poly antimonic acid and precursor powders generally known as Nasicons and preferably being selected from the group of powders consisting of sodium β/β"-alumina, sodium/potassium β/β"-alumina, sodium zirpsios, Gasicon and Yasicon.
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Citations
15 Claims
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1. A method of chemically bonding hydronium ion conducting solid electrolyte powder into dense polycrystalline shaped bodies comprising the steps of:
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(a) selecting a hydronium containing powder and a bonding agent selected from the group of bonding agents consisting of hydronium conducting organic polymers and phosphates; (b) intermingling the hydronium powder with the bonding agent to obtain a mixture; (c) forming the mixture into a predetermined shape; (d) curing the predetermined shape so as to create a dense polycrystalline shaped hydronium conducting ceramic body, in which the bonding agent does not affect the hydronium ion conductivity significantly. - View Dependent Claims (8)
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2. A method of chemically bonding hydronium ion conducting powder into dense polycrystalline shaped bodies comprising the steps of:
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(a) selecting a hydronium containing powder; (b) intermingling the hydronium powder with orthophosphoric acid bonding agent to obtain a mixture; (c) molding the mixture into a predetermined shape; (d) curing the predetermined shape so as to create a dense polycrystalline shaped hydronium ceramic body, in which the bonding agent does not affect the hydronium ion conductivity significantly. - View Dependent Claims (3, 4, 5, 6, 7)
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9. A hydronium ion conducting bonded polycrystalline solid, snow white in colour, very difficult to break by hand and with good resistance to breaking, shattering and cracking and having a conductivity at 100°
- C. between 1.4×
10-4 (ohm cm)-1 and 6.0×
10-4 (ohm cm)-1 wherein 50% to 90% by weight is hydronium conducting powder, the balance an ionic bonding agent. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- C. between 1.4×
Specification