（Ti0.7Zr0.2V0.1）Ni贮氢合金的电化学性能及氢致相变研究

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

摘要:

研究了（Ｔｉ０．７Ｚｒ０．２Ｖ０．１）Ｎｉ合金的相结构和电化学性能，结果表明：在比较快的冷却条件下，合金铸态组织为具有Ｂ２结构的单一奥氏体相；充氢使唤结构和奥氏体相转变为单斜结构的马氏体相；反复电以放氢使Ｔｉ２Ｎｉ２和Ｚｒ９Ｎｉ相逐渐从母中析出。

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.