Braze compositions, and related devices

An electrochemical cell comprising:

• a tubular separator disposed in a cell case defining a portion of a cathodic chamber and an anodic chamber, wherein the cathodic chamber comprises an alkali metal halide, and forms an ion capable of conducting through the separator;
• an electrically insulating ceramic collar disposed on a top end of the separator, and
• a metal ring disposed on the electrically insulating ceramic collar,
• wherein the electrically insulating ceramic collar is joined to the metal ring by a braze alloy composition comprising nickel, chromium, iron, silicon, boron and an active metal element, wherein chromium is present in an amount less than 10 weight percent, iron is present in an amount less than 10 weight percent, silicon is present in an amount from about 2 weight percent to about 10 weight percent, boron is present in an amount less than 5 weight percent, the active metal element is present in an amount from about 1 weight percent to about 3 weight percent, based on a total weight of the braze alloy composition, wherein the active metal element comprises titanium, zirconium, hafnium, vanadium, or a combination thereof, and wherein the braze alloy composition is in direct contact with both the electrically insulating ceramic collar and the metal ring.