Method of preparing porous, rigid ceramic separators for an electrochemical cell
Porous, rigid separators for electrochemical cells are prepared by first calcining particles of ceramic material at temperatures above about 1200* C. For a sufficient period of time to reduce the sinterability of the particles. A ceramic powder that has not been calcined is blended with the original powder to control the porosity of the completed separator. The ceramic blend is then pressed into a sheet of the desired shape and sintered at a temperature somewhat lower than the calcination temperature. Separator sheets of about 1 to 2.5 mm thickness and 30 to 70% porosity can be prepared by this technique. Ceramics such as yttria, magnesium oxide and magnesium-aluminum oxide have advantageously been used to form separators by this method.
- Assignee:
- Department of Energy
- Patent Number(s):
- US 4244898
- OSTI ID:
- 6424633
- Resource Relation:
- Patent File Date: Filed date 30 Mar 1979; Other Information: PAT-APPL-025629
- Country of Publication:
- United States
- Language:
- English
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