【摘要】 测试了MmxNi3．8Co0．6Mn0．55Ti0．05合金的充放电特性及循环寿命。当x＝1．05时，合金有较高的放电容量，其循环寿命略微降低，这主要归因于稀土元素有较好的吸氢特性且易在晶界处偏析，形成MmNi相。当x＝0．95时，合金的放电容量及循环寿命显著降低，这是由于合金中的Mn向晶界处偏析，且极易溶于6mol／LKOH中，破坏了合金的表面，降低了放电容量和循环寿命。更多还原

【Abstract】 The charge-discharge characteristics of MmxNi3.8Co0.6 Mn0.55Ti0.05 alloys were investigated . When x=1 .05 , thealloy had higher discharge capacity and lower cycle lifetime . It was due to the the rare earth elements high hydrogen-absorption characteristics and the precipitation of MmNi phase at the grain boundaries . When x= 0.95, the discharge capacity and cycle lifetimedecreased obviously owing to the precipitation of Mn element at the grain boundaries , and the Mn element was solved in the6mol/L KOH easily, broke the surfaces of the alloy, decreased the cycle lifetime .更多还原