کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9837635 1525281 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of composition on phase occurrence during charge process of AB5+x Ni-MH negative electrode materials
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Influence of composition on phase occurrence during charge process of AB5+x Ni-MH negative electrode materials
چکیده انگلیسی
Multi-substituted LaNi5-type alloys (AB5+x) are widely used as negative electrode materials in commercial Ni-MH batteries. Cobalt substitution on Ni sites allows to enhance battery cycle life by reducing alloy pulverization induced by hydrogen cycling. This improvement is attributed to the occurrence of a three-phase process (α, β and γ) during electrochemical hydrogen loading. In order to better understand the effect of the composition on the phase occurrence and to reduce the rate of costly cobalt, an in situ neutron diffraction study has been performed at room temperature during electrochemical charge of two different electrode materials MmNi4.07Mn0.63Al0.2M0.4 with M=Fe and Mn and B/A=5.3. These cobalt free compounds show cycle life comparable to that of commercial materials. The results show that three phases are also observed for these samples. The γ-phase content depends on M and is higher for M=Fe than for M=Mn. These results are related to the improved cycle lives and to the alloy pulverization process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 362, Issues 1–4, 15 May 2005, Pages 199-207
نویسندگان
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