| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
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| Symposium
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2010 Functional and Structural Nanomaterials: Fabrication, Properties, Applications and Implications
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| Presentation Title |
Microstructures and Electrochemical Properties of Nanostructured Mg2Ni-based Compound Containing Nb Additives |
| Author(s) |
Maryam Mohri, seyed farshid KASHANI BOZORG |
| On-Site Speaker (Planned) |
Maryam Mohri |
| Abstract Scope |
High hydrogen capacity of Mg2Ni intermetallic compound has made it a candidate material for negative electrode of rechargeable Nickel Metal Hydride batteries. In the present work, two strategies were selected in order to improve its hydrogen absorption kinetic; synthesis of Mg2Ni-based nanostructured compound and modification of composition using Nb additives. High energy ball milling of binary and ternary powder mixtures (Mg1.75Nb0.25Ni and Mg2Ni0.75Nb0.25) was carried out.
The effects of milling process and initial compositions on the microstructure milled products were studied employing X-ray diffraction and scanning and transmission electron microscopy. Also, electrochemical measurements of the nanostructured electrodes made from the milled product were measured using an automatic galvanostat.
It was found that Mg1.75Nb0.25Ni has beneficial effect on the formation kinetic of Mg2Ni nanocrystallites. Electrode made from the 20h milled product using initial composition of Mg1.75Nb0.25Ni exhibited a high discharge capacity of ~600mAhg-1 and relatively longer discharge life.
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| Proceedings Inclusion? |
Undecided |