高性能纳米晶储氢合金的制备

Preparation of a Nanocrystalline Hydrogen-Storage Alloy

用双辊快淬法得到晶粒尺寸小于50nm、由均匀CaCu5相组成的富铈稀土储氢合金,在200mA/g充放电条件下,合金放电比容量达到295mAh/g,经200循环后,容量衰减率为4.5%。将合金粉组装成AAA550型电池,在1C充放电条件下,经2次活化,比容量达到最大值547.4mAh/g,经95次循环后,容量衰减率为2.48%。

A misch-metal hydrogen-storage alloy consisting of a homogenous CaCu5 phase with grain size less than 50 nm was prepared by rapid quenching between double rollers. The specific capacity of alloy reached 295 mAh/g during charge and discharge with 200 mA/g. The attenuation of capacity was 4.5% after 200 cycles. The charging capacity of a battery made from this alloy powder was up to 547.4 mAh/g after 2 cycles discharge with a Couloumb. The attenuation of capacity was 2.48% after 95 cycles.