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Title: Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator

Abstract

A felt or other fabric of boron nitride suitable for use as an interelectrode separator within an electrochemical cell is wetted with a solution containing a thermally decomposable organic salt of an alkaline earth metal. An aqueous solution of magnesium acetate is the preferred solution for this purpose. After wetting the boron nitride, the solution is dried by heating at a sufficiently low temperature to prevent rapid boiling and the creation of voids within the separator. The dried material is then calcined at an elevated temperature in excess of 400* C. To provide a coating of an oxide of magnesium on the surface of the boron nitride fibers. A fabric or felt of boron nitride treated in this manner is easily wetted by molten electrolytic salts, such as the alkali metal halides or alkaline earth metal halides, that are used in high temperature, secondary electrochemical cells.

Inventors:
Publication Date:
OSTI Identifier:
6773932
Patent Number(s):
US 4360578
Assignee:
Dept. Of Energy
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 23 Jan 1981; Other Information: PAT-APPL-228002
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; BORON NITRIDES; WETTABILITY; ELECTROCHEMICAL CELLS; BATTERY SEPARATORS; ACETATES; CALCINATION; COATINGS; DRYING; ELECTRIC-POWERED VEHICLES; HEATING; HIGH-TEMPERATURE FUEL CELLS; MAGNESIUM COMPOUNDS; MAGNESIUM OXIDES; ALKALINE EARTH METAL COMPOUNDS; BORON COMPOUNDS; CARBOXYLIC ACID SALTS; CHALCOGENIDES; CHEMICAL REACTIONS; DECOMPOSITION; DIRECT ENERGY CONVERTERS; FUEL CELLS; NITRIDES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PNICTIDES; PYROLYSIS; THERMOCHEMICAL PROCESSES; VEHICLES; 300503* - Fuel Cells- Materials, Components, & Auxiliaries

Citation Formats

Mccoy, L R. Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator. United States: N. p., 1982. Web.
Mccoy, L R. Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator. United States.
Mccoy, L R. Tue . "Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator". United States.
@article{osti_6773932,
title = {Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator},
author = {Mccoy, L R},
abstractNote = {A felt or other fabric of boron nitride suitable for use as an interelectrode separator within an electrochemical cell is wetted with a solution containing a thermally decomposable organic salt of an alkaline earth metal. An aqueous solution of magnesium acetate is the preferred solution for this purpose. After wetting the boron nitride, the solution is dried by heating at a sufficiently low temperature to prevent rapid boiling and the creation of voids within the separator. The dried material is then calcined at an elevated temperature in excess of 400* C. To provide a coating of an oxide of magnesium on the surface of the boron nitride fibers. A fabric or felt of boron nitride treated in this manner is easily wetted by molten electrolytic salts, such as the alkali metal halides or alkaline earth metal halides, that are used in high temperature, secondary electrochemical cells.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {11}
}