Abstract: The present invention relates to a superelastic alloy-Ni sulfide element for a combined current collector-electrode in which Ti—Ni based alloy is used as a current collector and Ni sulfide is used as electrode material, the Ni sulfide being formed on the Ti—Ni based alloy by forming a Ni thin film on a surface of the Ti—Ni based alloy and sulfurdizing the Ti—Ni based alloy comprising the Ni thin film. Thus, a superelastic characteristic of the element is realized as well as small-size integration of a battery is possible.

Abstract: The present invention relates to Ti—Ni based functionally graded alloys easy in proportional control, which are made by cold working and annealing Ti—Ni based alloys under a predetermined temperature gradient. The thus processed Ti—Ni based functionally graded alloys have a shape memory effect and an ultra elasticity and at the same time, have a consecutive variation of shape depending on a temperature variation.