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US 7,255,961 B2Granted
Thin film composite electrolyte
AssigneeTrans Ionics Corporation
InventorRobert C. Schucker
Life of this patent
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Abstract
The invention is a thin film composite solid (and a means for making such) suitable for use as an electrolyte, having a first layer of a dense, non-porous conductive material; a second layer of a porous ionic conductive material; and a third layer of a dense non-porous conductive material, wherein the second layer has a Coefficient of thermal expansion within 5% of the coefficient of thermal expansion of the first and third layers.
Claims18
A process for forming a three-layered thin film composite solid electrolyte comprising the steps of:
- (a) tape casting a series of sheets or films, each said sheet formed from one of at least two slip composites, each said slip composite containing an electrolyte where the electrolyte of each said slip composite has a coefficient of thermal expansion, said coefficient for each said electrolyte in each said slip composite is identical within +/−5%, wherein one of the said slip composites is formed with an added combustible pore former (a “Porous Material”) and another of said slip composites is formed without said pore former material (a “Non Porous Material”);
- (b) laminating said series of sheets to create a layered structure having at least three layers, where said series of layers alternate between layers formed from said Non-Porous Materials and layers formed from said Porous Materials;
- and
- (c) sintering said layered structure at a final sintering temperature to densify said layer formed from said Non Porous Materials to create an ionically conductive layer, whereas said final sintering temperature is about 1500-1600° C.
1 more element
Dependencies are inferred from the claim text.