【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（真空电弧炉熔化，水冷铜坩埚凝固），合金铸态组织为具有Ｂ２结构（ＣｓＣｌ型）的单一奥氏体相；充氢使Ｂ２结构的奥氏体相转变为单斜结构的马氏体相；反复电化学充放氢使Ｔｉ２Ｎｉ和Ｚｒ９Ｎｉ１１相逐渐从母相中析出。在５０ｍＡ／ｇ放电倍率下，（Ｔｉ０．７Ｚｒ０．２Ｖ０．１）Ｎｉ合金的电化学容量可达３８０ｍＡｈ／ｇ，是ＴｉＮｉ二元合金的两倍。但经１０次充放电循环后合金容量迅速衰退至２００ｍＡｈ／ｇ。研究表明，（Ｔｉ０．７Ｚｒ０．２Ｖ０．１）Ｎｉ合金具有较高电化学容量主要是由于在ＴｉＮｉ相的催化作用下，具有高贮氢量的Ｔｉ２Ｎｉ相和Ｚｒ９Ｎｉ１１相能可逆地吸放氢所致，而其较快的容量衰退则主要与Ｔｉ２Ｎｉ相的氧化有关。更多还原

【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.更多还原