Mm(NiCoMnAl)_5贮氢合金中铝对直封型MH/Ni电池性能的影响

Effect of Al in Mm(NiCoMnAl) 5 on the Performance of the Sealed MH/Ni Cell

制作电池前在正极活性物质βＮｉ（ＯＨ）２微粒表面沉积５％Ｃｏ，抑制了γＮｉＯＯＨ的产生，并能有效地防止βＮｉ（ＯＨ）２在充放循环过程中粉化，通过对电池充放电曲线的测量、Ｘ射线分析，探明了用前处理方法可消除贮氢合金中铝对正极活性物质的影响．

XRD results showed that in sealed MH/Ni cell Al can be dissolved in alkaline solution and precipited on the surface of Ni(OH) 2, forming Ni 1- x Al x (OH) 2. Surface pretreatment of the hydrogen storage alloy powder of Mm(NiCoMnAl) 5 (Mm=mixed rare earth metal) could avoid the Al being released into the sealed MH/Ni cell.