Insulating seal for molten salt battery

Claim 1

IN A HIGH TEMPERATURE ELECTROCHEMICAL CELL, HAVING A CHAMBER CONTAINING ELECTROLYTE, AN ELECTRODE FOR ONE OF THE CELL''S REACTANTS CONTACTING SAID ELECTROLYTE, A COUNTERELECTRODE FOR ANOTHER OF THE CELL''S REACTANTS CONTACTING SAID ELECTROLYTE AND SPACED APART FROM SAID ELECTRODE THROUGH SAID ELECTROLYTE AND AN ELECTROLYTE-TIGHT INSULATING SEAL ELECTRICALLY ISOLATING SAID ELECTRODE FROM SAID COUNTERELECTRODE AND DEFINING PART OF SAID CHAMBER, THE IMPROVEMENT COMPRISING: SAID SEAL CONSISTING ESSENTIALLY OF AT LEAST ABOUT 15 PERCENT BY WEIGHT SOLID LITHIUM FLOURIDE AND THE BALANCE OF A LOW THERMAL EXPANSION FILLE SELECTED FROM THE GROUP CONSISTING OF ALUMINUM NITRIDE, LANTHANUM OXIDE, YTTRIUM OXIDE, CALCIUM ZIRCONATE AND LITHIUM ALUMINATE FOR MITIGATING THE EFFECTS OF LITHIUM FLOURIDE''S THERMAL EXPANSION PROPERTIES AND RESISTING THE FORMATION OF SALTS WITH THE CELL''S REACTANTS WHICH FROM LOW MELTING BINARY SALTS WITH LITHIUM FLUORIDE; AND SAID ELECTROLYTE COMPRISING A MIXTURE OF LITHIUM FLUORIDE AND A SALT WHICH WHEN FUSED IONICALLY CONDUCTS THE CELL''S CURRENT, WHEREIN THE LITHIUM FLOURIDE PRESENT IN THE ELECTROLYTE IS SUFFICIENT TO SUBSTANTIALLY SATURATE THE FUSED SALT AND THE FUSED SALT HAS A DECOMPOSITION POTENTIAL LESS THAN SAID LITHIUM FLOURIDE.