Abstract: A design and process for making hermetically sealed thermocompression feedthrough and peripheral seal for high temperature Li Alloy FeS.sub.x battery cells and battery enclosures. The selected materials and processes parameters are developed to match the high temperature Li Alloy/FeS.sub.x system.

Abstract: A method of manufacturing an electrical contact between a current lead and a part made of a superconductive ceramic of the type RBa.sub.2 Cu.sub.3 O.sub.y, where R designates a lanthanide chosen from Y, La, Nd, Sm, Eu, Gd, Ho, Er, Tm, Yb, and Lu, and where y lies in the range 6.9 to 7, in which method a layer of a material based on a silver-containing resin is deposited on said part, the part is dried, and is then heat treated in oxygen by being heated to a temperature greater than 900.degree. C., and then cooled, with the temperature dwelling at 450.degree. C. for a certain length of time corresponding to the phase during which said ceramic is reoxygenated.

Abstract: A method of making at least one low electrical resistance connection between a metal and a high T.sub.c superconducting ceramic part, said part being made from a ceramic powder which is placed in a mold, compressed, and sintered, wherein at least one volume of silver or gold powder corresponding to the shape of said connection and situated at the desired location is placed inside said mold in juxtaposition with said ceramic powder but without being mixed therewith, after which the compression and the sintering are performed under an atmosphere containing oxygen and at a temperature that is lower than the melting temperature of silver or gold.