Microstructure and superelasticity of NiS/TiNi composite electrode

Han-seong Kim; Gyu-bong Cho; Ki-won Kim; Kwon-koo Cho; Yinong Liu; Tae-hyun Nam

doi:10.1117/12.780068

13 November 2007 Microstructure and superelasticity of NiS/TiNi composite electrode

Han-seong Kim, Gyu-bong Cho, Ki-won Kim, Kwon-koo Cho, Yinong Liu, Tae-hyun Nam

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 642339 (2007) https://doi.org/10.1117/12.780068
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

Surface Ni sulfides layers were formed on the surface of a Ti-50.0Ni alloy by reacting sulfur and Ni film deposited on the alloy, and then microstructures, transformation behavior, shape memory characteristics, superelasticity and electrochemical properties of a Ti-50.0Ni(at%) alloy with the sulfides were investigated. When Ni film deposited on a Ti-50.0Ni alloy was annealed under the sulfur pressure of 100 kPa at 623 K, sulfides layers consisted of NiS and NiS_1.97 were formed. When annealing was made at 648 K annealing with annealing time less than 0.9 ks, sulfides layers consisted of NiS and NiS_1.97 were formed also, while only NiS_1.97 was formed when it was made for 1.8 ks. When annealing was made at 673 K annealing with annealing time longer than 0.9 ks, only NiS_1.97 was formed. A Ti- 50.0Ni(at%) alloy with surface NiS_1.97 layer showed the two-stage B2-R-B19' transformation behavior, the perfect shape memory effect and a partial superelasticity with a superelastic recovery ratio of 78 %. NiS_1.97 cathode showed a clear discharge behavior with multi voltage plateaus. Discharge capacity of NiS_1.97 cathode decreased abruptly with increasing number of cycles up to 3, above which it decreased gradually.

Citation Download Citation

Han-seong Kim, Gyu-bong Cho, Ki-won Kim, Kwon-koo Cho, Yinong Liu, and Tae-hyun Nam "Microstructure and superelasticity of NiS/TiNi composite electrode", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642339 (13 November 2007); https://doi.org/10.1117/12.780068

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