Electrochemical Performance and Phase Transformation Induced by Hydrogen in (Ti 0 7 Zr 0 2 V 0 1 )Ni Alloy

Abstract:

Electrochemical performance and the phase composition of the Ti 0 7 Zr 0 2 V 0 1 Ni alloy have been studied. The results show that its capacity reaches 380 mAh/g at discharging rate of 50 mA/g. After 10 cycles, the capacity declines to 200 mAh/g. The as cast alloy (Ti 0 7 Zr 0 2 V 0 1 )Ni has a B 2(CsCl type) structure. After electrochemical pulverization, Ti 2Ni and Zr 9Ni 11 phases precipitate from matrix. The high discharging capacity results from the joint contribution of three existing phases, TiNi,Ti 2Ni and Zr 9Ni 11 . Rapid decline of the capacity is caused by the oxidation of the Ti 2Ni phase.