MH-Ni电池中稀土贮氢合金微结构的XRD研究

XRD Study on Microstructure of Rare Earth Containing Hydrogen Storage Alloy in Ni-MH Battery

摘要:

提出了分离微晶和微应力两种引起X衍射线条宽化效应的最小二乘方法。用该方法分析研究了不同工艺制备的贮氢合金的微结构，对比研究了MH-Ni电池中的贮氢合金在活化前后和循环寿命实验前后微结构的变化。结果表明活化对负极材料微结构产生重大影响；循环寿命实验后贮氢合金微结构的变化与循环条件密切相关。

Abstract:

A least square method for separating two broadening effects caused by crystallite and micro-stress has been proposed and was applied to study the micro-structure of hydrogen storage alloys prepared by different methods. Changes of microstructure after activation and lifetime testing in Ni-MH battery have been comparatively investigated. The results show that the effect of activation on microstructure of the negative electrode material is significant. It is also found that the microstructure changes of the material are dependent on the lifetime testing conditions.