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

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

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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/sup 0/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:: McCoy, L.R.

Issue Date:: 1981-01-23

OSTI Identifier:: 5192671

Application Number:: ON: DE82004467

Assignee:: Dept. of Energy EDB-82-141761

DOE Contract Number:: W-31-109-ENG-38

Resource Type:: Patent

Resource Relation:: Other Information: Portions of document are illegible

Country of Publication:: United States

Language:: English

Subject:: 25 ENERGY STORAGE; BATTERY SEPARATORS; WETTABILITY; BORON NITRIDES; ACETATES; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; AQUEOUS SOLUTIONS; CALCINATION; CHEMICAL PREPARATION; DRYING; ELECTROCHEMICAL CELLS; HALIDES; MAGNESIUM COMPOUNDS; BORON COMPOUNDS; CARBOXYLIC ACID SALTS; CHEMICAL REACTIONS; DECOMPOSITION; DISPERSIONS; HALOGEN COMPOUNDS; MIXTURES; NITRIDES; NITROGEN COMPOUNDS; PNICTIDES; PYROLYSIS; SOLUTIONS; SYNTHESIS; THERMOCHEMICAL PROCESSES; 250903* - Energy Storage- Batteries- Materials, Components, & Auxiliaries

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                    McCoy, L.R. Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator.  United States: N. p., 1981. 
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                    McCoy, L.R. Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator.  United States.

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                    McCoy, L.R. Fri .  
        "Method of enhancing the wettability of boron nitride for use as an electrochemical cell separator".  United States.

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@article{osti_5192671,

  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/sup 0/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         = {1981},

  month        = {1}

}

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

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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 magnesiummore »« less
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